0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

Planning Application Boundary(Leitrim County Council)

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Sligo County Council)

T2

T1

T3

tw

spvs

peatrepository

Proposed culvert

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail C

Check dam @ 20 mcenters

refer to detail C

Type Y check damrefer to Detail D

Settlement pondrefer to detail A

proposedaccess track

Flow direction

constructioncompound

Proposedculvert

streamflowdirection

proposedmet mast

walkway

PlanningApplication

Proposed culvertrefer to detail B

silt fencerefer to detail F

O

O

OO

O

O

O

O

O

O

tw

tw

tw

tw tw

tw

tw

tw

tw

O

O

tw

O

tw

PlanningApplication

sp

sp

vs

spvs

sp sp

sp

sp

spvs

vs

sp

vssp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

carpark

sp

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Drawing No: P1459-0-0720-A1-0511-23-00A

Figure No: 0511-23

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

0511-23/1

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

Planning Application Boundary(Leitrim County Council)

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Sligo County Council)

T5

T4 T6

tw

tw

spvs

sp

spProposedculvertdetail B

PlanningApplication

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail C

Check dam @ 20 mcenters

refer to detail c

Settlement pondrefer to detail A

proposedaccess track

Flow direction

Type Y check damrefer to Detail d

substation

constructioncompound

Flow direction

constructioncompound

LOUGHNACROAGH

streamflowdirection

walkway

forestryroad

boardwalk

forestryroad

silt fencedetail F

O

O

O

O

O

O

O

O

Otw

tw

tw

tw

tw

tw

tw

tw

O

O

spvs

spvs

spvs

spvs

spvs

vs

vs sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-24-00A

0511-24

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

Planning Application Boundary(Leitrim County Council)

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Sligo County Council)

T7

T10

T8

O

tw

spvs

Proposed culvertdetail b

PlanningApplication

Interceptor drain

Collector drain

Check dam @ 50 mcenters

refer to detail c

Settlement pondrefer to detail A

Flow direction

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail D

constructioncompound

Flow direction

streamflowdirection

forestryroad

silt fencedetail F

O

O

O

O

O

O

O

O

tw

tw

tw tw

tw

tw

tw

tw

tw

O

O

tw

PlanningApplication

spvs

spvs

spvs

spvs

spvs

sp

sp

sp

sp

vssp

spvs

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Drawing No: P1459-0-0720-A1-0511-25-00A

Figure No: 0511-25

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

Planning Application Boundary(Leitrim County Council)

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Sligo County Council)

T9

borrow pit

peat

Proposed culvertdetail b

Proposed culvert

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail c

Settlement pondrefer to detail A

proposedaccess track

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail d

Flow direction

PlanningApplication

streamflowdirection

silt fencedetail F

O

O

O

O

O

OO

O

O

O

tw

tw

tw

tw

tw

tw

tw

tw

O

O

tw

sf

tw

tw

spvs

spvs

spvs

spvs

spvs

sp

sp

sp

vssp

vssp

spvs

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-26-00A

0511-26

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

Planning Application Boundary(Leitrim County Council)

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Sligo County Council)

peatrepository

Proposed culvertdetail b

Proposed culvert

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail c

Type Y check damrefer to Detail d

Settlement pondrefer to detail A

Flow direction

Check dam @ 20 mcenters

refer to detail E

Flow direction

PlanningApplication

streamflowdirection

O

O

O

O

O

tw

tw

tw

tw

tw

O

O

tw

tw

spvs

spvs

spvs

sp

sp

vs

vs

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Drawing No: P1459-0-0720-A1-0511-27-00A

Figure No: 0511-27

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)

PlanningApplication

Flow direction

Flow direction

Collector drain

Collector drain

Settlement pondrefer to detail A

Interceptor drain

Check dam @ 50 mcenters

refer to detail c

Check dam @ 20 mcenters

refer to detail c

Check dam @ 20 mcentersrefer to detail c

Type Y check damrefer to Detail d

existing drainage alongl4282 to be maintained

existing drainage alongl4282 to be maintained

existing drainage alongl4282 to be maintained

ROAD L4282

ROAD L4282

ROAD L4282

tw

tw

tw

tw

sp

sp

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-28-00A

0511-28

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflow

direction

streamflowdirection

streamflowdirection

Flow direction

Check dam @ 50 mcenters

refer to detail c

existing drainage alongl4282 to be maintained

existing drainage alongl4282 to be maintained

existing drainagealong L4282to be maintained

ROAD L4282

ROAD L4282

ROAD L4282

Existing culvert

Existingculvert

Existing culvert

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Drawing No: P1459-0-0720-A1-0511-29-00A

Figure No: 0511-29

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflowdirection

streamflowdirection

Flow direction

Flow direction

Collector drain

Settlement pondrefer to detail A

Interceptordrain

Check dam @ 50 mcenters

refer to detail c

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail d

existing drainage along

existing drainagealong L4282to be maintained

ROAD L4282

ROAD L4282

Existingculvert

Existing culvert

Proposed culverttw

tw tw tw

tw

O

sp

spsp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Drawing No: P1459-0-0720-A1-0511-30-00A

Figure No: 0511-30

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflowdirection

Flow direction

Flow direction

Collector drain

Settlement pondrefer to detail A

Check dam @ 20 mcentersrefer to detail c

Type Y check damrefer to Detail d

Proposed culvertdetail b

twtw

twtw

sp sp

sp

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 03/06/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0620-A1-0511-31-00A

0511-31

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflowdirection

Flow direction

Flow direction

Collector drain

Collector drain

Settlement pondrefer to detail A

silt fencedetail F

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail d

Proposedculvertdetail b

twtw

tw

twtw

tw

twtw

tw

tw

tw

tw

Proposedculvertdetail b

Type Y check damrefer to Detail d

spsp

sp

spsp

sp

sp

spsp

sp

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Drawing No: P1459-0-0720-A1-0511-32-00A

Figure No: 0511-32

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

0511-23

0511-33/1

countysligo

countyleitrim0511-24

0511-25

0511-26

0511-27 0511-28

0511-29

0511-300511-31

0511-32

0511-330511-23/1

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

Planning Application Boundary(Leitrim County Council)

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Sligo County Council)

Collector drain

sp

tw

tw

tw

tw

sp

sp

sp

Flowdirection

PlanningApplication

Type Y check damrefer to Detail d

streamflowdirection

Settlement pondrefer to detail A

Check dam @ 20 mcenters

refer to detail c

Flowdirection

Collector drain

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

twsptw

sp

sp

sptwtw

silt fencedetail F

Proposedculvertdetail b

streamflowdirection

Collector drain

Check dam @ 20 mcentersrefer to detail c

Flowdirection

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Drawing No: P1459-0-0720-A1-0511-33-00A

Figure No: 0511-33

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

0511-33/1

10001000

4000

10000

swale to be widened at entry to pond

INLET- divert roadside ditchinto settlement pond

100mm single sized stoneplaced at entrance to settlement pondand and within forebay area

initial stilling check damconstructed from20-40mm clean stone core with200mm cover of 100mm single size stone

geotextilewrap

1000 11250 3000

75

0

800

1000

100

discharge collector ditch

outflow control levelto be set 500mmbelow top of gabion

permenant water level

gabion basketmain settlement pond sediment forebay

100mm single sized stoneplaced at entrance to settlementpond and and within forebay area

forebay to be cleanedout regularly

Embankments to be constructedfrom suitable excavated

materials. Post constructionphase embankment materials to

be used to infill pond.phasing of infill to be agreed

with SUDS designer

YY'ZZ'

200

750

storage depth

discharge level

geotextile wrap embeddedinto embankment to preventpreferential flow alongedge of gabion basket

Silt will collect in the base of thesettlement pond. This will have tobe cleaned out regularly. Silt buildup should be monitored on site.

extend boundary bermsto prevent overflow

geotextilewrap

overflow dischargeto collector ditch

6250

1400 4000

invert ofinlet v-ditch

bed slope 1:50max.

20-40mm filtrationstone placed priorto gabions

SECTION

SCALE 1:100

SECTION

SCALE 1:100

ZZ'

YY'

ACCESS TRACK

ACCESS TRACK

TE A - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

Road

Timberstake

hy-tex terrastoppremium silt fence

Sediment fence/check dam detail

Bank

Bank

2000

4000 4000 4000

1500

4x2" knife edge weir 4x2" knife edge weir

20mm plywood sheet 20mm plywood sheet 20mm plywood sheetLaminar

flow in 2000

Forestry drains(applicable only

in forestry areas)

Block 5 forestry drains down slope of a outlet toprevent pollution to

reveiving waters

Blocked

BlockedSmall, medium & largestone filter beds

200

500

1000

20mm plywood sheet

Bank

4000 4000 4000

1500

200

Top of bank

4x2" knife edge weir 4x2" knife edge weir

Small, medium & largestone filter beds

Geotextile betweenbed to stop mixing of stone sizes

200

500

1000

20mm plywood sheet

200

500

1000

20mm plywood sheet

1000 gauge impereable polythene 1000 gauge impereable polythene

Laminar flow in drain

Outflow

Groundlevel

Sheet flow out overexisting vegetation or

into forest drain

Bank Bank

Top of bankTop of water

level

Top of bank

1000

500

2000

Section 11'

Section 22'

1'1

2'

2

TE B - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)

Pond Size m x L m x D m Catchment Size (m)

Return Period 50 yrs Storm Duration 500 1000 2000

6hr retention for coarse silt 6 hrs 2.8 x 9 x 1 m 4 x 13 x 1 m 5.7 x 18 x 1 m

11hr retention for medium silt 12 hrs 3.2 x 10 x 1 m 4.5 x 14 x 1 m 6.4 x 20 x 1 m

24hr retention for fine silt 24 hrs 3.5 x 11 x 1 m 5 x 16 x 1 m 7 x 22 x 1 m

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Drainage Details 1

Croagh WF

Drawing No: P1459-0-0720-A1-0511-34-00A

Figure No: 0511-34

DETAIL A1

DETAIL A2

MGMGPlanning

Coilte teo

Date: 07/07/2020

07/07/20

Example settlement pond sizes

type x - check dam detailcale

road side ditch twl

stone check dam20-40mm drainage stone

provide geotextilewrap if necessary

access roadway

road side ditch

-

-

mm

LONGITUDINAL ELEVATION

PLAN

stone check dam20-40mm drainagestone

provide geotextilewrap if necessary

side long view of access roadway surface

type y - check dam detailscale 1:100

side long view of access roadway surface

road side ditch/ditch twl

stone check dam20-40mm drainage stone provide geotextile

wrap if necessary

access roadway

road side ditch / ditch

direction of flow

provide geotextilewrap if necessary

ground level

34"marine plywood baffleplate 300mm embedded

into base of drain / ditch

twl

fencing post driveninto peat/subsoil forlateral support

VARIE

S -

20

0

stone check dam20-40mm drainage stoneplywood embedded 200mm

into sidewall of ditch

LONGITUDINAL ELEVATION

PLAN

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

Drainage Design Notes

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

accessroad

top of bank

plancollector ditch

toe of bank

silt fence

outfall protection berm

existingculvet

top of bank

access road

outfall protection berm

toe of bank

izometric view

collector ditch

existing culvet

silt fence

schematic - not to scaleCULVET - OUTFALL PROTECTION DETAIL

existingforestrydrains

existing forestry drains

mm m

in

mm m

in

Spill

way

MM m

in

note: spacing of check dams along centreline and scour protectionbelow each check dam

spillway

needle punchedgeofabric on downstreamspillway protection toprevent erosion

bag fill material eitheraggregate, sand or drysand - cement mixture

schematic - not to scale

TEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOWSAND FILLED BAG CONSTRUCTION

A B

lenth ch that point a and have eal elevation

check damerosion protection

elevation

schematic - not to scaleTEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOW

'x' +600 Max.

m

in

'x'

single layer geosyntheticOR FELLED FOREST LOGSSUITABLE AGGRAGATE FILL

DRAINAGE PIPE IF REQUIRED

ROAD LEVEL

SCALE 1:100

max

750

min

.

ROAD CONSTRUCTIONCAPPING MATERIAL/

DIAMETER VARIESDRAINAGE PIPE,

503.3 (1) OF THE NRAFILL MATERIAL TO CL.

SPEC. FOR ROADWORKS

ROAD LEVEL

SCALE 1:50

'x' +300 Min.

TRENCH WIDTH=

'TYPE B' CULVERT - DRAINAGE CROSSING BENEATH EXCAVATED ROAD

'TYPE A' CULVERT - DRAINAGE CROSSING BENEATH FLOATING ROAD

reinforcement / separation

refer to client standard detail for road make up

refer to client standard detail

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Client:

Job:

Title:

Figure No: -

DETAIL C DETAIL D

DETAIL B

DETAIL C

DETAIL C

DETAIL B

Drawn By: MG/GD

Project No.: P1459-0

Croah WF

Drainae Detail

Drawing No: P1459-0-0720-A1-0511-35-00A

MGMGPlanning

Coilte teo

Date: 07/07/2020

07/07/20

distributor drain

collector drain

overland discharge oroutfall to watercoursevia settlement pond

vegetation swale

lined with slightlyraised peat turves

typical vegetation swale - planscale 1:250

check dam locations

A

A

'

B

B

'

G.L.

Mineral Soil

raised/contouredpeat blocks

top of peat blocks to beapprox 200 mm higher thanadjacent undisturbed ground

peatcatotelm peat mass

upper vegetationlayer and root zone regulation layer of

placed peatapprox 200 mm

G.L.

Mineral Soil

contoured raisedturves along edgeof vegetation swale

peatcatotelm peat mass

upper vegetationlayer and root zone

collector ditch

distributor ditch

~7.5 to 15m

AA'SCALE 1:200ECTIN

BB'SCALE 1:100ECTIN

silt fencescale 1:25

MIN. 1000

material stockpile

in-situ peat

Stakes driven500-700mm intoground

Staple holds Geotextilefilter fabric in place

silt fence embedded100mm into ground

Refer to Habitat management Planand Peat Management PLan

for Stockpile management notes

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

road constructionas per client

standard details

Staple holds Geotextilefilter fabric in place

Stakes driven500-700mm into ground

Geotextileembedded 200mm

silt fence for watercourse protectionscale 1:25

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Client:

Job:

Title:

Drainage Details 3

Figure No: 0511-36

DETAIL E

DETAIL F-1

DETAIL F-I1

Drawn By: MG/GD

Croagh WF

Project No.: P1459-0

Drawing No: P1459-0-0720-A1-0511-36-00A

MGMGPlanning

Coilte teo

Date: 07/07/2020

03/06/20

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

Collector drain

W'W

Accessroad

Collector ditch

Edge protectionTop of bank

Toe of bank

Silt fence

Accessroad

Collector drain

Ground levelSkallow

collectorditch

Edgeprotection

Siltfence

Groundlevel

Placed roadedge material

2

1

Spillway outfall

Silt fence

Edge protection

Collector ditch

Access road

Collector drain

SpillwayY'Y

X'

X

Settlement pond

Settlement pond

Settlement pond

PLA

SECTI WW'

IETIC IEW

spillwa outfall planschematic - not to scale

750

6750

150

300

SIDE ELEATI

PLADrainage pipecut in half andlinked togetherwith chain link and rivets

Pipe can be placed on

uneven groundand creates

flow channel andprevents erosion

X

X'

XX'

TYPICAL PIPE SPILLWAY DETAIL

YY'

scale 1:50

Steep batter to beprotected

6D

Diversion bankDown drain

Inlet stabilisedwith sandbags

Pipe slope 3% of steeper Flexible pipe

3D+0.6m1,3m at less

than 1% grade

d

schematic - not to scaleTYPICAL PIPE SPILLWAY DETAIL

3000

3000

TEPA CNCETE ASH T PIT

Plan

ELEATIN

stop log

concrete lorry

stop log500

2000 gaugepolythene

SCALE 1:50

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Client:

Job:

Title:

Drainage Details 4

Figure No: 0511-37

DETAIL H

DETAIL G

DETAIL I

Drawn By: MG/GD

Croagh WF

Coilte teo

Project No.: P1459-0

Date: 07/07/2020

Drawing No: P1459-0-0720-A1-0511-37-00A

MGMGPlanning07/07/20

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

T2

T1

T3

tw

spvs

peatrepository

Proposed culvert

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail C

Check dam @ 20 mcenters

refer to detail C

Type Y check damrefer to Detail D

Settlement pondrefer to detail A

proposedaccess track

Flow direction

constructioncompound

Proposedculvert

streamflowdirection

proposedmet mast

walkway

PlanningApplication

Proposed culvertrefer to detail B

silt fencerefer to detail F

O

O

OO

O

O

O

O

O

O

tw

tw

tw

tw tw

tw

tw

tw

tw

O

O

tw

O

tw

PlanningApplication

sp

sp

vs

spvs

sp sp

sp

sp

spvs

vs

sp

vssp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

carpark

sp

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

0511-23A/1

Drawing No: P1459-0-0620-A1-0511-23A-00A

0511-23A

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

T5

T4 T6

tw

tw

spvs

sp

spProposedculvertdetail B

PlanningApplication

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail C

Check dam @ 20 mcenters

refer to detail c

Settlement pondrefer to detail A

proposedaccess track

Flow direction

Type Y check damrefer to Detail d

substation

constructioncompound

Flow direction

constructioncompound

LOUGHNACROAGH

streamflowdirection

walkway

forestryroad

boardwalk

forestryroad

silt fencedetail F

O

O

O

O

O

O

O

O

Otw

tw

tw

tw

tw

tw

tw

tw

O

O

spvs

spvs

spvs

spvs

spvs

vs

vs sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Drawing No: P1459-0-0620-A1-0511-24A-00A

Figure No: 0511-24A

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)T7

T10

T8

O

tw

spvs

Proposed culvertdetail b

PlanningApplication

Interceptor drain

Collector drain

Check dam @ 50 mcenters

refer to detail c

Settlement pondrefer to detail A

Flow direction

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail D

constructioncompound

Flow direction

streamflowdirection

forestryroad

silt fencedetail F

O

O

O

O

O

O

O

O

tw

tw

tw tw

tw

tw

tw

tw

tw

O

O

tw

PlanningApplication

spvs

spvs

spvs

spvs

spvs

sp

sp

sp

sp

vssp

spvs

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-25A-00A

0511-25A

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

T9

borrow pit

peat

Proposed culvertdetail b

Proposed culvert

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail c

Settlement pondrefer to detail A

proposedaccess track

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail d

Flow direction

PlanningApplication

streamflowdirection

silt fencedetail F

O

O

O

O

O

OO

O

O

O

tw

tw

tw

tw

tw

tw

tw

tw

O

O

tw

sf

tw

tw

spvs

spvs

spvs

spvs

spvs

sp

sp

sp

vssp

vssp

spvs

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Drawing No: P1459-0-0720-A1-0511-26A-00A

Figure No: 0511-26A

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

peatrepository

Proposed culvertdetail b

Proposed culvert

Interceptor drain

Collector drain

Check dam @ 50 mcentersrefer to detail c

Type Y check damrefer to Detail d

Settlement pondrefer to detail A

Flow direction

Check dam @ 20 mcenters

refer to detail E

Flow direction

PlanningApplication

streamflowdirection

O

O

O

O

O

tw

tw

tw

tw

tw

O

O

tw

tw

spvs

spvs

spvs

sp

sp

vs

vs

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-27A-00A

0511-27A

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

PlanningApplication

Flow direction

Flow direction

Collector drain

Collector drain

Settlement pondrefer to detail A

Interceptor drain

Check dam @ 50 mcenters

refer to detail c

Check dam @ 20 mcenters

refer to detail c

Check dam @ 20 mcentersrefer to detail c

Type Y check damrefer to Detail d

existing drainage alongl4282 to be maintained

existing drainage alongl4282 to be maintained

existing drainage alongl4282 to be maintained

ROAD L4282

ROAD L4282

ROAD L4282

tw

tw

tw

tw

sp

sp

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Drawing No: P1459-0-0720-A1-0511-28A-00A

Figure No: 0511-28A

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflow

direction

streamflowdirection

streamflowdirection

Flow direction

Check dam @ 50 mcenters

refer to detail c

existing drainage alongl4282 to be maintained

existing drainage alongl4282 to be maintained

existing drainagealong L4282to be maintained

ROAD L4282

ROAD L4282

ROAD L4282

Existing culvert

Existingculvert

Existing culvert

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-29A-00A

0511-29A

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflowdirection

streamflowdirection

Flow direction

Flow direction

Collector drain

Settlement pondrefer to detail A

Interceptordrain

Check dam @ 50 mcenters

refer to detail c

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail d

existing drainage along

existing drainagealong L4282to be maintained

ROAD L4282

ROAD L4282

Existingculvert

Existing culvert

Proposed culverttw

tw tw tw

tw

O

sp

spsp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-30A-00A

0511-30A

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflowdirection

Flow direction

Flow direction

Collector drain

Settlement pondrefer to detail A

Check dam @ 20 mcentersrefer to detail c

Type Y check damrefer to Detail d

Proposed culvertdetail b

twtw

twtw

sp sp

sp

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 03/06/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Drawing No: P1459-0-0620-A1-0511-31A-00A

Figure No: 0511-31A

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)Existing ground surfaceminor contour (2 m interval)

existing road to beupgradedproposed road

large drainage arrows

fill area

cut area

stream flow direction

road l4282 (no upgrade)(existing drainage along roadl4282 to be maintained)

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

PlanningApplication

streamflowdirection

Flow direction

Flow direction

Collector drain

Collector drain

Settlement pondrefer to detail A

silt fencedetail F

Check dam @ 20 mcenters

refer to detail c

Type Y check damrefer to Detail d

Proposedculvertdetail b

twtw

tw

twtw

tw

twtw

tw

tw

tw

tw

Proposedculvertdetail b

Type Y check damrefer to Detail d

spsp

sp

spsp

sp

sp

spsp

sp

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coilte teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

Drawing No: P1459-0-0720-A1-0511-32-00A

0511-32A

countysligo

countyleitrim0511-23A

0511-33A/1

0511-24A

0511-25A

0511-26A

0511-27A0511-28A

0511-29A

0511-30A

0511-31A

0511-32A

0511-33A0511-23A/1

Drawing Legend :rivers/streams

rivers/streams 50m buffer

Lakes 50m buffer

Lakes

Semi-Natural VegetationSwale / Filter Bed /secondary sp

VS

Overland Flow Discharge

Settlement Pond

O

Exist

ing

Dra

inage

SP

Pro

pose

d Dra

inage

Collector Ditch Culvert

Interceptor Ditch Culvert

Treated Water DischargeTW

proposed culverts/bridges

Check Dam 'type A'

settlement pond - vegetation filter- level spreader

Silt Fences

Direction of flow

Swales/Downstream Collector Drain

Upstream Interceptor Drain

Check Dam 'type B'

Pumping Sump

settlement pond - level spreader

Existing ground surfacemajour contour (10 m interval)

crane platform

borrow pit

turbine and swept area

turbine foundation

Existing ground surfaceminor contour (2 m interval)

existing road to be upgraded

proposed road

substation

construction compound

drainage flow/runoffdirection

peat repository

fill area

cut area

stream flow direction

Planning Application Boundary(Leitrim County Council)

Planning Application Boundary(Sligo County Council)

Collector drain

tw

tw

tw

tw

Flowdirection

PlanningApplication

Type Y check damrefer to Detail d

streamflowdirection

Settlement pondrefer to detail A

Check dam @ 20 mcenters

refer to detail c

Flowdirection

Collector drain

sp

sp

sp

sp

DRAINAGE NOTES:1. Roadway surfacing design and construction to Engineer'sSpecification.2. Spare straw bales/silt fencing/ or similar, to be stored onsite. The level of silt in runoff during construction is to bemonitored visually and excessive silt levels in any area to betemporarily managed by placing silt fences, straw bales / orsimilar or additional check dams at the problem areas.3. SUDS system to be constructed prior to, or at the same timeas the access tracks. Interim measures such as the placement ofstraw bales/silt fencing/or similar approved method or additionalcheck dams and silt fences to be employed in all instances wherework carried out to construct the access tracks is likely to causeadverse environmental effects through increased silt loadings beinggenerated during the construction phase.4. Suitable prevention measures should be in place at all timesto prevent the conveyance of significant volumes of silt toreceiving watercourses. See notes on pollution prevention.5. Interceptor swales / ditches to be used to collect upstreamsurface water flows. regular cross drains / discharge to fieldditches will be required to transfer / discharge surface water ininterceptor drains to suitable field drain outfall points.6. Drainage swales / ditches to be excavated adjacent to theaccess tracks. Regular cross drains to be located along accesstracks to prevent excessive volumes of water collecting in theswales / ditches. Locations of cross drains to be agreed with theEngineer on site. Surface water will not be allowed to dischargedirectly into existing watercourses.7. Where possible, a buffer zone of >20m to any existingwatercourse will be required where over land discharges areproposed from access track swales / ditches.8. Batters of all proposed swales / ditches to have a slope ofbetween 1 : 1.5 to 1 : 2 depending upon depth of swale/ditch and willbe left as cut to re-vegetate with local species.9. Track side swales / ditches to be shallow with moderategradients to prevent scouring. In steep areas check dams should beinstalled to reduce flow velocities and provide source control ofsilt containment. Where necessary these have been designated inconjunction with settlement ponds and silt traps, prior todischarge.10. Settlement ponds to be constructed for silt removal atturbine bases and hard stand areas. Pond sizes depends oncatchment area served. Sample pond sizes shown on Drawing D501.11. straw bales / or similar and silt fences to be used alsoaround spoil heaps to mitigate silt runoff. silt fences may beremoved when suitable vegetation cover is established.12. silt fences to be provide along edge of existing watercoursewhere works comes within <20m of edge of any ditch / ephemeralchannels.13. Slopes of the swales / ditches to be vegetated or protectedfrom erosion until vegetation has been established. Strippedvegetative layer (peat 'sod' or 'scraw') from excavations to bestored locally and used to line slopes and base of swales / ditchesor longitudinal mounds of vegetation swales at field draindischarge points.14. Areas stripped of vegetation should be kept to a minimum.15. Clean stone flow control check dams to be made of locallywon / geologically similar well graded stone. Aggregate size forstone check dams to be typically 20- 40mm clean stone. On slopingsections of the access tracks, 40mm check dams to be protectedfrom washing away through the placement of 100m stone on thedownhill face of the check dam and by wrapping in geotextile.16. Build up of silt levels at check dams to be removed anddisposed of appropriately. Silt levels at check dams to be visuallyinspected as part of an ongoing drainage maintenance programmeduring the construction phase. Where check dams become cloggedwith silt or vegetation, stone check dam to be removed andreplaced subsequent to the removal of silt.17. Spacing and frequency of check dams will be dependent uponlongitudinal gradient of swale.18. Location of filtration check dams (if required) to be agreedon site with Engineer. Settlement ponds to be constructed in amanner where they may be easily infilled at a later date (postcompletion of the turbine base and hardstand construction). Onlysuitable materials excavated from the pond to be used to form partof the embankment around the pond.19. Oil/fuel should be stored within bunded containmentstructures.20. silt bags will be used on site at field drain dischargelocations, as necessary.

POLLUTION PREVENTION NOTES1. Site management proposals are intended to ensure protection

against surface water and groundwater pollution, surface watersiltation, and stream bank and land erosion.

2. Suitable drainage control measures should be in place at all timesto prevent conveyance of significant volumes of silt to off sitereceiving watercourses.

3. Silty water can arise from dewatering excavations, erosion ofexposed/disturbed ground, erosion of temporary stockpiles, plantand wheel wash water, runoff from site roads/tracks, anddisturbance of existing field drains and ditches.

Discharges4. Water containing silt will not be pumped directly to any natural

watercourse. All discharges to be made over open ground or intoexisting field drain with silt trap a minimum 20m from nearestwatercourse unless otherwise stated.

5. No excavated material is to be stored within any surface waterbuffer zone.

6. Pumped water will be directed into track side ditches and treatedin settlement ponds and vegetation swales prior to overlanddischarge.

7. Pumping of clean water from excavations / or over-pumping intofield drains/ditches/streams will be completed in a manner thatdoes not cause scour or erosion at the point of release/discharge.This will be done by reducing the flow velocities or by use ofsplash plates, and other similar discharge controls.

8. Vegetation will NOT be stripped from existing field drains/ditchesunless absolutely necessary.

Excavations9. Where deep excavations are proposed cut-off drains will be use to

reduce the amount of surface water entering the excavation. Thiswill be the case around turbine base excavations.

Exposed Ground Stockpiles10. The amount of exposed ground and temporary stockpiles open at

any one time will be minimised, as far as practicable.

Site tracks11. Use of track side swales with check dams, and/or filtration check

dams will reduce silt in runoff water as required.12. Check dams to be inspected and cleaned regularly.

Refueling13. Refuelling will be completed in line with CEMP requirements and

away from field drains / ditches and watercourses / waterbodies.14. Spill kits and drip trays will be available on site for use as

required.

Concrete15. Care will be taken when completing concrete works on site to

ensure no discharges of concrete or wash water occurs.16. Concrete wash water, and waste concrete will be managed

appropriately on site.

If water pollution is identified the followingsteps would be adhered to

STOP - work in the immediate area should be stopped and the sourceof the pollution identified.

CONTAIN - the source of the pollution should be bunded using asuitable method. Natural watercourses should be temporarily divertedaround the source of pollution.

NOTIFY - The relevant authorities (Site Manager / Inland FisheriesIreland / NPWS / Local Authority etc.) should be notified immediatelyto ensure that measures can be implemented downstream to protectfisheries and other sensitive areas, if required.

anagement TypeDescription of SUDS Drainage Control

ethods

AvoidanceControls

1) Application of 50m buffer zones to naturalWatercourses where possible2) Application of 10m buffer zones to main drainswhere possible3) Using small working areas4) Working in appropriate weather, and suspendingcertain work activities in advance of forecastedwet weather

Source Controls:

1) Use of upstream interceptor drains anddownstream collector drains / oversized swales,vee-drains, diversion drains, flumes and culvertpipes2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) and other similar/equivalent or appropriatesystems3) Using small working areas4) Surrounding stockpiles with silt fencing5) weathering off / sealing peat stockpiles

In-Line Controls:

1) Interceptor drains, vee-drains, oversizedswales/collector drains2) erosion and velocity control measures such as: a) sand bags b) oyster bags filled with gravel c) filter fabrics d) straw bales e) flow limiters f) weirs or baffles g) and/or other similar/equivalent orappropriate systems.3) silt fences, filter fabrics4) In stream Sedimats5) collection sumps, temporary sumps, pumpingsystems5) attenuation lagoons6) sediment traps, stilling / settlement ponds

Water TreatmentControls:

1) Temporary sumps2) attenuation ponds3) Temporary storage lagoons4) Sediment traps, Stilling / Settlement ponds5) Proprietary settlement systems such asSiltbuster, and/or other similar/equivalent orappropriate systems.6) Silt dewatering bags

Outfall Controls:

1) Levelspreaders2) Buffered outfalls3) Vegetation filters4) Silt dewatering bags5) Flow limiters and weirs

mitigation / drainage cointrols availablefor use across the site

twtw

twtw

silt fencedetail F

Proposedculvertdetail b

streamflowdirection

Collector drain

Check dam @ 20 mcentersrefer to detail c

Flowdirection

sp

sp

sp

sp

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: 1:2,000 (A1)

Date: 06/07/2020 Checked By: MG

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Proposed Drainage Layout

Croagh WF

Coillte Teo

Figure No:

Ordnance Survey Ireland Licence No. EN 0044720

© Ordnance Survey Ireland/Government of Ireland

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

40

Metres

0 80 120 160 200

Drawing Notes1. Drawings issued are for planning application purposesonly.2. Copyright, all rights reserved. No part here withmay be copied or reproduced partially or wholly in anyform whatsoever without the prior notice of thecopyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metricdimensions only should be taken off this drawing.4. All dimensions are in metres.

KEY PLAN

0511-33A/1

Drawing No: P1459-0-0620-A1-0511-33A-00A

0511-33A

10001000

4000

10000

swale to be widened at entry to pond

INLET- divert roadside ditchinto settlement pond

100mm single sized stoneplaced at entrance to settlement pondand and within forebay area

initial stilling check damconstructed from20-40mm clean stone core with200mm cover of 100mm single size stone

geotextilewrap

1000 11250 3000

75

0

800

1000

100

discharge collector ditch

outflow control levelto be set 500mmbelow top of gabion

permenant water level

gabion basketmain settlement pond sediment forebay

100mm single sized stoneplaced at entrance to settlementpond and and within forebay area

forebay to be cleanedout regularly

Embankments to be constructedfrom suitable excavated

materials. Post constructionphase embankment materials to

be used to infill pond.phasing of infill to be agreed

with SUDS designer

YY'ZZ'

200

750

storage depth

discharge level

geotextile wrap embeddedinto embankment to preventpreferential flow alongedge of gabion basket

Silt will collect in the base of thesettlement pond. This will have tobe cleaned out regularly. Silt buildup should be monitored on site.

extend boundary bermsto prevent overflow

geotextilewrap

overflow dischargeto collector ditch

6250

1400 4000

invert ofinlet v-ditch

bed slope 1:50max.

20-40mm filtrationstone placed priorto gabions

SECTION

SCALE 1:100

SECTION

SCALE 1:100

ZZ'

YY'

ACCESS TRACK

ACCESS TRACK

TE A - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

Road

Timberstake

hy-tex terrastoppremium silt fence

Sediment fence/check dam detail

Bank

Bank

2000

4000 4000 4000

1500

4x2" knife edge weir 4x2" knife edge weir

20mm plywood sheet 20mm plywood sheet 20mm plywood sheetLaminar

flow in 2000

Forestry drains(applicable only

in forestry areas)

Block 5 forestry drains down slope of a outlet toprevent pollution to

reveiving waters

Blocked

BlockedSmall, medium & largestone filter beds

200

500

1000

20mm plywood sheet

Bank

4000 4000 4000

1500

200

Top of bank

4x2" knife edge weir 4x2" knife edge weir

Small, medium & largestone filter beds

Geotextile betweenbed to stop mixing of stone sizes

200

500

1000

20mm plywood sheet

200

500

1000

20mm plywood sheet

1000 gauge impereable polythene 1000 gauge impereable polythene

Laminar flow in drain

Outflow

Groundlevel

Sheet flow out overexisting vegetation or

into forest drain

Bank Bank

Top of bankTop of water

level

Top of bank

1000

500

2000

Section 11'

Section 22'

1'1

2'

2

TE B - TICAL ROAD SIDE SETTLEET OD DETAILSCALE 1:200 (NOTE DIMENSIONS VARY DEPENDING ON CATCHMENT SIZE - see attached table)

Pond Size m x L m x D m Catchment Size (m)

Return Period 50 yrs Storm Duration 500 1000 2000

6hr retention for coarse silt 6 hrs 2.8 x 9 x 1 m 4 x 13 x 1 m 5.7 x 18 x 1 m

11hr retention for medium silt 12 hrs 3.2 x 10 x 1 m 4.5 x 14 x 1 m 6.4 x 20 x 1 m

24hr retention for fine silt 24 hrs 3.5 x 11 x 1 m 5 x 16 x 1 m 7 x 22 x 1 m

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Drawn By: MG/GD

Project No.: P1459-0

Client:

Job:

Title:

Drainage Details 1

Croagh WF

Drawing No: P1459-0-0720-A1-0511-34A-00A

Figure No: 0511-34A

DETAIL A1

DETAIL A2

MGMGPlanning

Coilte teo

Date: 07/07/2020

07/07/20

Example settlement pond sizes

type x - check dam detailcale

road side ditch twl

stone check dam20-40mm drainage stone

provide geotextilewrap if necessary

access roadway

road side ditch

-

-

mm

LONGITUDINAL ELEVATION

PLAN

stone check dam20-40mm drainagestone

provide geotextilewrap if necessary

side long view of access roadway surface

type y - check dam detailscale 1:100

side long view of access roadway surface

road side ditch/ditch twl

stone check dam20-40mm drainage stone provide geotextile

wrap if necessary

access roadway

road side ditch / ditch

direction of flow

provide geotextilewrap if necessary

ground level

34"marine plywood baffleplate 300mm embedded

into base of drain / ditch

twl

fencing post driveninto peat/subsoil forlateral support

VARIE

S -

20

0

stone check dam20-40mm drainage stoneplywood embedded 200mm

into sidewall of ditch

LONGITUDINAL ELEVATION

PLAN

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

Drainage Design Notes

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

accessroad

top of bank

plancollector ditch

toe of bank

silt fence

outfall protection berm

existingculvet

top of bank

access road

outfall protection berm

toe of bank

izometric view

collector ditch

existing culvet

silt fence

schematic - not to scaleCULVET - OUTFALL PROTECTION DETAIL

existingforestrydrains

existing forestry drains

mm m

in

mm m

in

Spill

way

MM m

in

note: spacing of check dams along centreline and scour protectionbelow each check dam

spillway

needle punchedgeofabric on downstreamspillway protection toprevent erosion

bag fill material eitheraggregate, sand or drysand - cement mixture

schematic - not to scale

TEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOWSAND FILLED BAG CONSTRUCTION

A B

lenth ch that point a and have eal elevation

check damerosion protection

elevation

schematic - not to scaleTEMPORARY CHECK DAM / SETTLEMENT POND OVERFLOW

'x' +600 Max.

m

in

'x'

single layer geosyntheticOR FELLED FOREST LOGSSUITABLE AGGRAGATE FILL

DRAINAGE PIPE IF REQUIRED

ROAD LEVEL

SCALE 1:100

max

750

min

.

ROAD CONSTRUCTIONCAPPING MATERIAL/

DIAMETER VARIESDRAINAGE PIPE,

503.3 (1) OF THE NRAFILL MATERIAL TO CL.

SPEC. FOR ROADWORKS

ROAD LEVEL

SCALE 1:50

'x' +300 Min.

TRENCH WIDTH=

'TYPE B' CULVERT - DRAINAGE CROSSING BENEATH EXCAVATED ROAD

'TYPE A' CULVERT - DRAINAGE CROSSING BENEATH FLOATING ROAD

reinforcement / separation

refer to client standard detail for road make up

refer to client standard detail

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Client:

Job:

Title:

Figure No: -A

DETAIL C DETAIL D

DETAIL B

DETAIL C

DETAIL C

DETAIL B

Drawn By: MG/GD

Project No.: P1459-0

Croah WF

Drainae Detail

Drawing No: P1459-0-0720-A1-0511-35A-00A

MGMGPlanning

Coilte teo

Date: 07/07/2020

07/07/20

distributor drain

collector drain

overland discharge oroutfall to watercoursevia settlement pond

vegetation swale

lined with slightlyraised peat turves

typical vegetation swale - planscale 1:250

check dam locations

A

A

'

B

B

'

G.L.

Mineral Soil

raised/contouredpeat blocks

top of peat blocks to beapprox 200 mm higher thanadjacent undisturbed ground

peatcatotelm peat mass

upper vegetationlayer and root zone regulation layer of

placed peatapprox 200 mm

G.L.

Mineral Soil

contoured raisedturves along edgeof vegetation swale

peatcatotelm peat mass

upper vegetationlayer and root zone

collector ditch

distributor ditch

~7.5 to 15m

AA'SCALE 1:200ECTIN

BB'SCALE 1:100ECTIN

silt fencescale 1:25

MIN. 1000

material stockpile

in-situ peat

Stakes driven500-700mm intoground

Staple holds Geotextilefilter fabric in place

silt fence embedded100mm into ground

Refer to Habitat management Planand Peat Management PLan

for Stockpile management notes

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

road constructionas per client

standard details

Staple holds Geotextilefilter fabric in place

Stakes driven500-700mm into ground

Geotextileembedded 200mm

silt fence for watercourse protectionscale 1:25

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Client:

Job:

Title:

Drainage Details 3

Figure No: 0511-36A

DETAIL E

DETAIL F-1

DETAIL F-I1

Drawn By: MG/GD

Croagh WF

Project No.: P1459-0

Drawing No: P1459-0-0720-A1-0511-36A-00A

MGMGPlanning

Coilte teo

Date: 07/07/2020

03/06/20

Project Design Drawing Notes1. Drawings issued are for planning stage only.2. Copyright, all rights reserved. No part here with may be copied orreproduced partially or wholly in any form whatsoever without the priornotice of the copyright owner Hydro-Environmental Services.3. Do not scale off this drawing. Figured metric dimensions only should betaken off this drawing.

HYDROENVIRONMENTALSERVICES

22 Lower Main StDungarvan

Co. WaterfordIreland

tel: +353 (0) 58-44122tel: +353 (0) 58-44244email: info@hydroenvironmental.ieweb: www.hydroenvironmental.ie

Collector drain

W'W

Accessroad

Collector ditch

Edge protectionTop of bank

Toe of bank

Silt fence

Accessroad

Collector drain

Ground levelSkallow

collectorditch

Edgeprotection

Siltfence

Groundlevel

Placed roadedge material

2

1

Spillway outfall

Silt fence

Edge protection

Collector ditch

Access road

Collector drain

SpillwayY'Y

X'

X

Settlement pond

Settlement pond

Settlement pond

PLA

SECTI WW'

IETIC IEW

spillwa outfall planschematic - not to scale

750

6750

150

300

SIDE ELEATI

PLADrainage pipecut in half andlinked togetherwith chain link and rivets

Pipe can be placed on

uneven groundand creates

flow channel andprevents erosion

X

X'

XX'

TYPICAL PIPE SPILLWAY DETAIL

YY'

scale 1:50

Steep batter to beprotected

6D

Diversion bankDown drain

Inlet stabilisedwith sandbags

Pipe slope 3% of steeper Flexible pipe

3D+0.6m1,3m at less

than 1% grade

d

schematic - not to scaleTYPICAL PIPE SPILLWAY DETAIL

3000

3000

TEPA CNCETE ASH T PIT

Plan

ELEATIN

stop log

concrete lorry

stop log500

2000 gaugepolythene

SCALE 1:50

SignedChkdDescriptionDate

Revisions

Sheet Size: A1

Scale: as shown (A1)

Checked By: M.G.

Client:

Job:

Title:

Drainage Details 4

Figure No: 0511-37A

DETAIL H

DETAIL G

DETAIL I

Drawn By: MG/GD

Croagh WF

Coilte teo

Project No.: P1459-0

Date: 07/07/2020

Drawing No: P1459-0-0720-A1-0511-37A-00A

MGMGPlanning07/07/20