annual environmental report 2015 - environmental … · · 2016-05-3040 250 62.5 0.72 n/a 6.0-9.0...

Annual Environmental Report 2015

Agglomeration Name: Ballyhaunis

Licence Register No. D0069-01

i | Irish Water

Table of Contents

Section 1. Executive Summary and Introduction to the 2015 AER 1 1.1 Summary report on 2015 1

Section 2. Monitoring Reports Summary 2 2.1 Summary report on monthly influent monitoring 2 2.2 Discharges from the agglomeration 3 2.4 Data collection and reporting requirements under the Urban Waste Water Treatment

Directive 5 2.5 Pollutant Release and Transfer Register (PRTR) - report for previous year 5

Section 3 Operational Reports Summary 6 3.1 Treatment Efficiency Report 6

3.2 Treatment Capacity Report 6 3.3 Extent of Agglomeration Summary Report 7 3.4 Complaints Summary 7 3.5 Reported Incidents Summary 7

3.6 Sludge / Other inputs to the WWTP 8

Section 4. Infrastructural Assessments and Programme of Improvements 9 4.1 Storm water overflow identification and inspection report 9

4.2 Report on progress made and proposals being developed to meet the improvement

programme requirements. 10

Section 5. Licence Specific Reports 12 5.1 Priority Substances Assessment 13

Section 6. Certification and Sign Off 14 Section 7. Appendix 15

1 | Irish Water

1 Section 1. Executive Summary and Introduction to the 2015 AER

1.1 Summary report on 2015

This Annual Environmental Report has been prepared for D0069-01, Ballyhaunis, in County Mayo in accordance with the requirements of the wastewater discharge licence for the agglomeration. Specified reports are included as an appendix to the AER as follows:

• Storm water overflow assessment • Priority substances assessment

The agglomeration is served by a wastewater treatment plant with a Plant Capacity PE of 4,000. The treatment process includes the following:

• preliminary treatment (including screening / grit removal) • secondary treatment - activated sludge • chemical dosing for phosphorus removal

The final effluent from the Primary Discharge Point was non-compliant with the Emission Limit Values in 2015. The following parameters exceeded the emission limit values in 2015:

• Orthophosphate

75,665 kgs sludge (as kgs dry solids) were removed from the wastewater treatment plant in 2015 as dewatered sludge cake by licenced contractors. Sludge was transferred to Biocore Sludge Treatment Centre (lime stabilisation) Ballivor, Co. Meath (SSF-COR-MH-13-0001-02), Tulsk, Carrowbehy, Castlerea and Scramogue, Co. Roscommon, Ballymacward and Moylough, Co. Galway. An Annual Statement of Measures is included in Appendix 7.1.

2 | Irish Water

2 Section 2. Monitoring Reports Summary

2.1 Summary report on monthly influent monitoring

Table 2.1 - Influent Monitoring Summary

BOD (mg/l)

COD (mg/l)

SS (mg/l)

TP (mg/l)

TN (mg/l)

Hydraulic Loading (m3/d)

Organic Loading (PE/day)

Number of Samples

12 12 12 12 12

Annual Max. 420 1097 661 10.3 60.1 3,984 17,463 *

Annual Mean 232 532 265 4.6 26.7 1,268 4,887

*Note: The maximum annual loading of 17,463 is attributed to an unusual high flow to the plant in May 2015. With the elimination of high loading of May 12th 2015, the annual mean organic loading would be 3,743 P.E, which is within the design capacity. Significance of results The annual mean hydraulic loading is less than than the peak Treatment Plant Capacity as detailed further in Section 3.2. The annual maximum hydraulic loading is greater than the peak Treatment Plant Capacity as detailed further in Section 3.2. The annual mean organic loading is greater than the Treatment Plant Capacity as detailed further in Section 3.2. The annual maximum organic loading is greater than the Treatment Plant Capacity as detailed further in Section 3.2.

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2.2 Discharges from the agglomeration

Table 2.2 - Effluent Monitoring Summary

BOD (mg/l)2

COD (mg/l)2

TSS (mg/l)2

Ortho-P (mg/l)

Total Ammonia (mg/l)

pH Visual Inspection Comments

WWDL ELV (Schedule A) 20 125 25 0.6 N/A 6.0-9.0 Total Ammonia as N -ELV of 1mg/l does not commence until 31/12/19

ELV with Condition 2 Interpretation included

40 250 62.5 0.72 N/A 6.0-9.0

Interim % reduction from influent concentration1

N/A N/A N/A N/A N/A

% reduction with Condition 2 Interpretation included 3

N/A N/A N/A N/A N/A

Number of sample results 12 12 12 12 12 365 Weekly

Number of sample results above WWDL ELV/not achieving min % reduction 1, 2

0 0 0 1 0 0

Number of sample results above ELV with Condition 2 Interpretation included

0 0 0 1 0 0 e.g. grab / composite taken

Annual Mean (for parameters where a mean ELV applies)

2.0 16.6 5.3 0.24 10.3

Overall Compliance (Pass/Fail) Pass Pass Pass Fail Pass Pass Pass

Notes: 1. % reductions apply in certain licences only and are based on the minimum % reduction relative to the influent load for each sample. Lines can be deleted for

clarity if not used 2. Licence

Schedule: Interpretation of Discharge Monitoring Results generally only applies to BOD5, COD & SS, but also applies to % reductions.

3. Apply Condition 2 allowance of 100%/150%/20% to interim % Reduction also e.g. 150% allowance for 50% SS reduction requirement = 18.75% reduction

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Significance of results

The WWTP was non-compliant with the ELVs set in the wastewater discharge licence. There was 1 sample non-compliant with the ELVs in relation to orthophosphate. The non-compliance is due to a possible shock load to the plant. The impact on receiving waters is assessed further in Section 2.3. .

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2.3 Ambient monitoring summary

Table 2.3 - Ambient Monitoring Report Summary Ambient

Monitoring Point from

WWDL (or as agreed with

EPA)

Irish Grid Referenc

e

EPA Feature Coding Tool

code

Receiving Waters Designation (N)

WFD Status

Does assessment of the ambient monitoring

results indicate that the discharge is impacting

on water quality?

Bathing Water

Drinking Water

FWPM Shellfish

Upstream (aSW1u)

136062E 269958N

RS30DO10150 n/a n/a n/a n/a Poor n/a

Downstream (aSW1d)

134683E 270911N

RS30DO10160 n/a n/a n/a n/a Poor No

The summary results for the upstream and downstream monitoring are included as in Appendix 7.2 Detailed results are uploaded directly by Mayo County Council to the EPA via EDEN. Significance of results

The WWTP was non-compliant with the ELVs set in the wastewater discharge licence as detailed in Section

2.2.

The discharge from the wastewater treatment plant cannot be entirely attributed to an observable

negative impact on the water quality and the Water Framework Directive status. Further investigations are

warranted by Irish Water in this regard. The ELV for Ammonia comes in to effect on 31/12/19.

2.4 Data collection and reporting requirements under the Urban Waste Water Treatment Directive

The reporting requirement under the Urban Wastewater Directive is completed by electronic submission of data was completed in February 2016.

2.5 Pollutant Release and Transfer Register (PRTR) - report for previous year

Agglomerations greater than 2,000 p.e and less than 100,000 p.e have no reporting requitrements for 2015.

6 | Irish Water

3 Section 3 Operational Reports Summary

3.1 Treatment Efficiency Report

A summary presentation of the efficiency of the treatment process including information for all the parameters specified in the licence is included below: Table 3.1 - Treatment Efficiency Report Summary

cBOD (kg/yr)

COD (kg/yr)

SS (kg/yr)

Comment

Influent mass loading (kg/year)

107,018 245,119 122,040

Effluent mass emission (kg/year)

885 7,360 2,333

% Efficiency (% reduction of influent load)

99% 97% 98%

3.2 Treatment Capacity Report

Table 3.2 - Treatment Capacity Report Summary

Hydraulic Capacity – Design / As Constructed (dry weather flow) (m3/year) 365,000

Hydraulic Capacity – Design / As Constructed (peak flow) (m3/year) 1,095,000

Hydraulic Capacity – Current loading (m3/year) 462,963

Hydraulic Capacity – Remaining (m3/year) 632,037

Organic Capacity - Design / As Constructed (PE) 4,000

Organic Capacity - Current loading (PE) 4,887

Organic Capacity – Remaining (PE) 0

Will the capacity be exceeded in the next three years? (Yes / No) Yes

Note: With the elimination of high loading of May 12th 2015, the annual mean organic loading would be 3,743 P.E which is within the design capacity.

7 | Irish Water

3.3 Extent of Agglomeration Summary Report

Table 3.3 - Extent of Agglomeration Summary Report

% of p.e. load

generated in the agglomeration

Load generated in the agglomeration that is collected in the sewer network

100

Load collected in the agglomerations that enters treatment plant Unknown

Load collected in the sewer network but discharged without treatment

Unknown

Load generated in the agglomeration that is collected in the sewer network is the total load generated and collected in the municipal network within the boundary of the agglomeration.

Load collected in the agglomerations that enters treatment plant is that portion of the previous figure which enters the wastewater treatment plant

Load collected in the sewer network but discharged without treatment is that portion of the first figure which is discharges without treatment

3.4 Complaints Summary

A summary of complaints of an environmental nature is included below. Table 3.4 - Complaints Summary Table:

Number Date & Time

Nature of Complaint

Cause of Complaint

Actions taken to resolve issue

Closed (Y/N)

W/O23657489 15/10/15 Sewage leak from pumphouse

Power failure Contractor carried out electrical repairs

Y

W/O 23802119 17/12/15 Overflowing sewage on Bridge St, Ballyhaunis

Blockage exacerbated by adverse weather. Sewer rods found in the line.

Jetting and CCTV survey carried out.

Y

3.5 Reported Incidents Summary

A summary of reported incidents is included below. Table 3.5.1 - Summary of Incidents Incident Type (e.g. Non-compliance, Emission, spillage, Emergency Overflow Activation)

Incident Description

Cause No. of incidents

Corrective Action

Authorities Contacted Note 1

Reported to EPA (Yes/No)

Closed (Y/N)

Emission Breach of ELV Shock load

1 Ferric dose increased

Inland Fisheries

Yes Y

Spillage Uncontrolled release

Power Failure

1 Power restored

Inland Fisheries

Yes Y

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Note 1: For shellfish waters notify the Marine Institute (MI) Sea Fisheries Protection Authority (SFPA) Food Safety Authority (FSAI) and An Bord Iascaigh Mhara (BIM). This should also include any other authorities that should be contacted arising from the findings of any Licence Specific Reports also e.g. Drinking Water Abstraction Impact Risk Assessment, Fresh Water Pearl Mussel Impact Assessments etc.

Table 3.5.2 - Summary of Overall Incidents

Number of Incidents in 2015 2

Number of Incidents reported to the EPA via EDEN in 2015 2

Explanation of any discrepancies between the two numbers above n/a

3.6 Sludge / Other inputs to the WWTP

‘Other inputs’ to the waste water treatment plant are summarised in Table 3.6 below. Table 3.6 - Other Inputs1,2

Input type

m3/year PE/year % of load to WWTP

Included in Influent Monitoring (Y/N)?3

Is there a leachate/sludge acceptance procedure for the WWTP? (Y/N)

Is there a dedicated leachate/sludge acceptance facility for the WWTP? (Y/N)

Domestic /Septic Tank Sludge

0 0 0 n/a n/a n/a

Industrial / Commercial Sludge

0 0 0 n/a n/a n/a

Landfill Leachate (delivered by tanker)

0 0 0 n/a n/a n/a

Landfill Leachate (delivered by sewer network)

0 0 0 n/a n/a n/a

Municipal Sludge from Ballindine and Irishtown Wastewater Treatment Plants

192 Unknown Unknown Y Y N

Notes: Sludge is added to the storm tank which is returned to the inlet prior to influent sampling point.

1. Other Inputs include; septic tank sludge, industrial /commercial sludge, landfill leachate and any other sludge that is collected and added to the treatment plant.

2. Sludge that is added to a dedicated sludge reception facility at a waste water treatment plant not included in Table 3.6. Only

include sludge which is added to the waste water treatment process stream. Enter zero where there are no inputs. 3. If any inputs were introduced prior to influent monitoring point and therefore already reported in S.2.1 Influent Monitoring

Summary, then clarify this to avoid duplication and over-reporting of PE.

9 | Irish Water

4 Section 4. Infrastructural Assessments and Programme of Improvements

4.1 Storm water overflow identification and inspection report

The Storm Water Overflow Identification & Inspection report is included in Appendix 7.3. A summary of the significance and operation is included below. Table 4.1.1 - SWO Identification and Inspection Summary Report WWDL Name / Code for Storm Water Overflow

Irish Grid Ref.

Included in Schedule A3 of the WWDL

Significance of the overflow (High / Medium / Low)

Compliance with DoEHLG Criteria

No. of times activated in 2015 (No. of events)

Total volume discharged in 2015 (m3)

Total volume discharged in 2015 (P.E.)

Estimated /Measured data

SW005 E149312,N278831

Yes Low No Unknown Unknown Unknown N/A

Table 4.1.2 - SWO Identification and Inspection Summary Report

How much sewage was discharged via SWOs in the agglomeration in the year (m3/yr)?

Unknown

How much sewage was discharged via SWOs in the agglomeration in the year (p.e.)?

Unknown

What % of the total volume of sewage generated in the agglomeration was discharged via SWOs in the agglomeration in 2015?

Unknown

Is each SWO identified as non-compliant with DoEHLG Guidance included in the Programme of Improvements?

Yes

The SWO assessment includes the requirements of Schedule A3 & C3 Yes

Have the EPA been advised of any additional SWOs / changes to Schedule C3 and A4 under Condition 1.7?

N/A

http://www.epa.ie/pubs/advice/wastewater/UrbanWasteWater2.pdf

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4.2 Report on progress made and proposals being developed to meet the improvement programme requirements.

Table 4.2.1 - Specified Improvement Programme Summary

Specified Improvement Programmes

(under Schedule A and C of

WWDL)

Licence Schedule (A or

C)

Licence Completion

Date

Date Expired? (N/NA/Y

)

Status of Works ((i) Not Started; (ii) At

planning stage; (iii)

Work ongoing on-site; (iv)

Commissioning Phase; (v) Completed;

(vi) Delayed;)

% Constructio

n Work Completed

Timeframe for

Completing the Work

Comments

Improvement for compliance with ELV

C 31/12/2019

N Not started

0 Unknown The improvement programme will be reviewed by Irish Water to access the works required to comply with licence conditions

Improvement works to increase organic/hydraulic loading

C 31/12/2019

N Not started 0 Unknown The improvement programme will be reviewed by Irish Water to access the works required to comply with licence conditions

11 | Irish Water

A summary of the status of any improvements identified by under Condition 5.2 is included below. Table 4.2.2 - Improvement Programme Summary

Improvement Identifier

Improvement Description

Improvement Source Progress (% completed)

Expected Completion Date

Comments

N/A WWTP assessment (Condition 5.2).

Sewer Integrity Tool (Condition 5.2).

N/A Secondary discharges assessment (Condition 5.2).

Additional storm water storage capacity

SWO assessment – 2015 AER (Condition 4 & 5.2).

0% Unknown Appendix 7.3

N/A Drinking Water Abstraction Risk Assessment (Condition 4)

N/A Shellfish Impact Risk Assessment (Condition 5)

N/A Pearl Mussel Impact Assessment (Condition 4)

N/A Improved Operational Control

N/A Incident Reduction

N/A Elimination/Reduction of Priority Substances

The sewer integrity tool output is providedin Appendix 7.6 Table 4.2.3 - Sewer Integrity Risk Assessment Tool Summary

The Improvement Programme should include an assessment of the integrity of the existing wastewater works for the following:

Risk Assessment Rating (High, Medium, Low)

Risk Assessment Score

Comment

Hydraulic Risk Assessment Score

2015 Sewer Integrity Risk Assessment is not complete. Irish Water intends to complete this work and submit as an addition to AER during 2016

Environmental Risk Assessment Score

Structural Risk Assessment Score

Operation & Maintenance Risk Assessment Score

Overall Risk Score for the agglomeration

12 | Irish Water

5 Section 5. Licence Specific Reports

Licence Specific Reports Summary Table

Licence Specific Report Required in AER or outstanding from previous AER

Report Included in AER 2015

Reference to relevant section of AER (e.g. Appendix 2 Section4.

Priority Substances Assessment

Yes Yes Appendix 7.4

Drinking Water Abstraction Point Risk Assessment

No N/A

Habitats Impact Assessment No N/A

Shellfish Impact Assessment No N/A

Pearl Mussel Report No N/A

Toxicity/Leachate Management

No N/A

Toxicity of Final Effluent Report

No N/A

Small streams Risk Score No N/A

Licence Specific Reports Summary of Findings

Licence Specific Report

Recommendations in Report

Summary of Recommendations in Report


Yes Based on this assessment no further sampling or anaylsis is required

Drinking Water Abstraction Point Risk Assessment

N/A

Habitats Impact Assessment

N/A

Shellfish Impact Assessment

N/A

Pearl Mussel Report N/A

Toxicity/Leachate Management

N/A

Toxicity of Final Effluent Report

N/A

Small streams Risk Score

N/A

13 | Irish Water

5.1 Priority Substances Assessment

The Priority Substances Assessment report is included in Appendix 7.4. A summary of the findings of this report is included below. Table 5.1 - Priority Substance Assessment Summary

Licensee self- assessment checks to determine whether all relevant information is included in the Assessment.

Does the assessment use the Desk Top Study Method or Screening

Analysis to determine if the discharge contains the parameters in

Appendix 1 of the EPA guidance

Desk Top Study and Screening Analysis

Does the assessment include a review of Trade inputs to the works? Yes

Does the assessment include a review of other inputs to the works? Yes

Does the report include an assessment of the significance of the results

where a listed material is present in the discharge? (e.g. impact on the

relevant EQS standard for the receiving water)

Yes

Does the assessment identify that priority substances may be impacting

the receiving water? No

Does the Improvement Programme for the agglomeration include the

elimination / reduction of all priority substances identified as having an

impact on receiving water quality?

No

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6 Section 6. Certification and Sign Off

Table 6.1 - Summary of AER Contents

Does the AER include an Executive Summary? Yes

Does the AER include an assessment of the performance of the Waste Water

Works (i.e. have the results of assessments been interpreted against WWDL

requirements and or Environmental Quality Standards)?

Yes

Is there a need to advise the EPA for consideration of a Technical Amendment /

Review of the licence? No

List reason e.g. additional SWO identified (insert lines as required) N/A

Is there a need to request/advise the EPA of any modifications to the existing

WWDL? Refer to Condition 1.7 (changes to works/discharges) & Condition 4

(changes to monitoring location, frequency etc.)

No

List reason e.g. failure to complete specified works within dates specified in the

licence, changes to monitoring requirements (insert lines as required) N/A

Have these processes commenced? (i.e. Request for Technical Amendment /

Licence Review / Change Request) N/A

Are all outstanding reports and assessments from previous AERs included as an

appendix to this AER? N/A

List outstanding reports (insert lines as required) N/A

Declaration by Irish Water

The AER contains the following;

Introduction and background to 2015 AER

Monitoring reports summary.

Operational reports summary.

Infrastructural Assessment and Programme of Improvements.

Licence specific reports.

Certification and Sign Off

Appendices I certify that the information given in this Annual Environmental Report is truthful, accurate and complete:

Signed: ___________________________ Date: _22/03/2016_____________ Gerry Galvin Chief Technical Advisor

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7 Section 7. Appendix Appendix 7.1 - Annual Statement of Measures Appendix 7.2 - Ambient monitoring summary Appendix 7.3 - Storm water overflow identification and inspection report Appendix 7.4 - Priority substances assessment

16 | Irish Water

Appendix 7.1 - Annual Statement of Measures

There were no major capital or operational changes undertaken in 2015. No additional measures have been taken in 2015 in relation to prevention of environmental damage. The need for measures to prevent environmental damage will be reviewed on an annual basis.

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Appendix 7.2 - Ambient monitoring summary

Based on ten samples Environmental Quality Standard (EQS)

Parameter Units aSW1u aSW1d Environmental Objectives (Surface Waters) Regulations

2009, as amended

BOD mg/l

0.5 (mean)

0.5 (95%ile)

0.5 (mean)

0.5 (95%ile)

High Status ≤1.3 (mean) or ≤2.2 (95%ile) Good Status ≤1.5 (mean) or ≤2.6 (95%ile)

Temperature

oC 12.2

(mean) 11.9

(mean) Not greater than a 1.5oC rise in ambient temperature outside the mixing zone

Total Ammonia

(as N)

mg/l

0.05 (mean) 0.108

(95%ile)

0.25 (mean)

1.0 (95%ile)


Orthophosphate

(as P)

mg/l

0.019 (mean) 0.047

(95%ile)

0.02 (mean)

0.04 (95%ile)


Dissolved

Oxygen

% 86.3%

(95%ile) 85.5%

(85%ile) Lower Limit: 95%ile >80% Saturation Upper Limit: 95%ile <120% Saturation

pH

pH Units

7.6 (mean)

7.45 (mean)

Soft Water 4.5 <pH<9.0 Hard Water 6.0 <ph<9.0

18 | Irish Water

Appendix 7.3 – Storm Water Overflow Assessment

Storm Water Overflow Assessment



xix | Irish Water

Table of Contents 1 Introduction 20

2 Storm Water Overflow Assessment 21 2.1 Description of SWOs 21

2.2 Assessment of Operating Criteria of SWOs 21

2.3 Assessment of Design Criteria of SWOs 21

2.3.1 Compliance with Formula A .............................................................................. 21

2.3.2 Significance of Spill ........................................................................................... 23

2.4 Assessment of Requirement for Storage 23

3 Remedial Measures to Ensure Compliance 24 3.1 Specified Improvement and Improvement Programme Works 24

3.2 Additional Measures 24

20 | Irish Water

1 Introduction

This report has been prepared for D0069-01, Ballyhaunis, in County Mayo in accordance with the

requirements of Condition 4.12 of the wastewater discharge licence for the agglomeration. This report

identifies storm water overflows within the agglomeration and assesses the compliance of the storm

water overflows with the criteria set out in the DoEHLG document on ‘Procedures and Criteria in

Relation to Storm Water Overflows’, 1995.

There is 1Nr. SWOs within the agglomeration. It is listed in Table 1. As they are no register of cyprinid

fisheries in Ireland, it will be estimated that the River Dalgan is a cyprinid river.

Table 1: Storm Water Overflows in the Agglomeration

Licence

Code

Discharge Location Receiving Water

Name and WFD

Code

WFD Status

of Receiving

Water

Other

designation of

receiving water Easting Northing

SW5 149312 278831 River Dalgan

(IE-WE-30-211)

Poor SAC Corrib

System, 9km

downstream,

supposed

cyprinid river

A storm water overflow assessment is required to comply with the requirements of the wastewater

discharge licence condition as detailed below.

Condition 4.12 Storm Water Overflows

4.12.1 The licensee shall, prior to the date for submission of the second AER (required under

Condition 6.8), carry out an investigation for the identification and assessment of storm water

overflows. A report on the storm water overflows shall be submitted to the Agency as part of

the second AER. The assessment shall include a determination of compliance with the criteria

for storm water overflows, as set out in the DoEHLG Procedures and Criteria in Relation to

Storm Water Overflows’, 1995, and any other guidance as may be specified by the Agency.

4.12.2 The licensee shall carry out an assessment of storm water overflows at least once every

three years thereafter and report to the Agency on each occasion as part of the AER. The

assessment shall include a determination of compliance with the criteria for storm water

overflows, as set out in the DoEHLG ‘Procedures and Criteria in Relation to Storm Water

Overflows’, 1995, and any other guidance as may be specified by the Agency. The licensee shall

maintain a written record of all assessments and remedial measures arising from the

assessment.

21 | Irish Water

2 Storm Water Overflow Assessment

2.1 Description of SWOs

SW5 is located within the WWTP site. It comprises of the discharge from the stormwater holding tank

on site. When flows over 3DWF enter the plant, the excess flow enters the storm tank and is re-

circulated to the inlet works when inlet flows reduce. If the tank fills to capacity, it overflows and

discharges to the River Dalgan via the final discharge pipe. All storm overflow to river will be

screened, grit classified and will have received some degree of settlement.

2.2 Assessment of Operating Criteria of SWOs

The following criteria for each SWO on the network have been examined in accordance with the

assessment criteria set out in Procedures and Criteria in Relation to Storm Water Overflows in

order to determine possible capacity constraints.

1. Does the SWO cause significant visual or aesthetic impact and public complaints

2. Does the SWO cause deterioration in water quality in the receiving water (i.e. is there a

deterioration in ecological quality status attributable to the SWO)

3. Does the SWO gives rise to failure in meeting the requirements of national regulations on

foot of EU Directives (e.g. bathing water quality standards, shellfish water quality standards,

Water Framework Directive status etc.),

4. Does the SWO operate in dry weather.

Table 2: Assessment of Operating Criteria CSO Ref

Causes significant visual or aesthetic impact and public complaints.

Causes deterioration in water quality in the receiving water

Gives rise to failure in meeting the requirements of national Regulations on foot of EU Directives.

Operates in dry weather

Compliant / Non-Compliant

SW5 No No No No Compliant

2.3 Assessment of Design Criteria of SWOs

2.3.1 Compliance with Formula A

Formula A is used in the Procedures and Criteria in Relation to Storm Water Overflows as

follows:-

Formula A = DWF + 1.36P + 2E (m3/day)

P = design domestic population contributing to SWO (to be estimated)

E = design industrial effluent flow (estimated to be 20% of domestic PE unless otherwise by

LA)

DWF = Dry weather flow m3/day (dry weather flow of total PE, based on 0.175m

3/PE/day)

Table 3 provides an estimation of the current population of Ballyhaunis based on Census data.

22 | Irish Water

Table 3: Estimation of current Ballyhaunis population (Census data)

Year Population Population growth

(%/annum)

2002 1381

2006 1708 5.92

2011 2312 7.07

Expected 2015 2966

Based on 2006 –

2011 growth rate

The 2015 AER reports an annual mean hydraulic loading of 1,268 m3/d and a mean organic

loading of 4,887 PE (855 m3/d based on 175 L/PE/d). In a conservative approach and based on

these values, it will be estimated that the current total organic loading at the inlet of the treatment

plant is 4,900 PE and that the current hydraulic loading is 1,300 m3/d. Based on the estimation of

the 2015 population, the domestic PE is equal to 2,966 PE (approximated to

3,000 PE for formula A calculations ).

As a result the non-domestic loading is estimated to 1,900 PE. The difference between these

figures and the considered hydraulic loading will be considered as resulting from groundwater

and/or surface water infiltration. Based on these estimations, the loading of the plant includes:

3,000 PE from domestic inputs

1,900 PE from non-domestic inputs

442.5 m3/d due to groundwater and/or surface water infiltration.

Table 4 gives an assessment of the compliance of SW004 to the formula A spill setting.

Table 4: Formula A calculations

Designation Formula A flow

(L/s) Spill setting (L/s)

Compliance to DOEHLG

Number of dilution

SW004 69.96 34.72 (3 DWF) Supposed compliant1

15.95

1 This is the storm water overflow located before the inlet of the treatment plant. Provided that sufficient storage capacity of

2h at 3 design DWF or 3 current DWF, whichever is higher, is maintained and that compliance with the DOEHLG criteria is

observed, this overflow will be considered as compliant.

23 | Irish Water

2.3.2 Significance of Spill

Monitoring information in relation to frequency and duration of overflows is not available

The significance of overflows to inland freshwaters has been assessed as follows:

Low Significance:

>8:1 Dilutions in Receiving water (average SWO DWF / 95%ile river flow)

No interaction with other discharges

Medium Significance - only if all these criteria apply.

Dilution < 8 : 1 Limited or no interaction with other discharges > 2,000 population equivalent Cyprinid fishery

High Significance - only if all these criteria apply.

Dilution < 2 : 1 Interaction with other discharges > 10,000 population equivalent Cyprinid or salmonid fishery

Table 3: Assessment of Significance CSO Ref Dilution PE Range Designation of Receiving

Water

Significance

SW5 15.95 2,000 – 10,000 Supposed cyprinid river Low

2.4 Assessment of Requirement for Storage

The necessity for a storm tank within the sewer network has been assessed based on available

dilution as detailed in Table 3 (from Procedures and Criteria in Relation to Storm Water

Overflows) included as Table 4 below. The requirement for a storm tank at a wastewater

treatment plant shall be based on an overflow setting of 3 DWF.

Table 4 – SDD Method Recommended Storage at Overflows1

Dilution Factor2 Overflow Setting Storage Tank

> 8 Formula A None

> 6 Formula A + 455 P or

Formula A

None

40 l/PE

> 4 Formula A 40 l/PE

> 2 Formula A 80 l/PE

> 1 Formula A 120 l/PE 1. Table 3 extracted from Procedures and Criteria in Relation to Storm Water Overflows

2. Dilution factor = average DWF / 95%ile river flow

Table 5 – Stormwater Storage within Agglomeration

Dilution

Factor1

Required

Overflow

Setting (l/s)

Actual

Overflow

Setting (l/s)

Required

Storage Tank

Volume (m3)

Actual

Storage Tank

Volume (m3)

Compliant /

Non-

Compliant

15.95 69.96 34.72 (3

DWF)

325 (2h at 3

current DWF)

267 (2.14h at 3

design DWF,

1.64h at 3

current DWF)

Non-compliant

2. Dilution factor = average DWF / 95%ile river flow

24 | Irish Water

3 Remedial Measures to Ensure Compliance

3.1 Specified Improvement and Improvement Programme Works

There are no specified improvement works or improvement programmes relating to stormwater

overflows. However, it is worth noting that Schedule C.1 states that: Improvement works may be

required to increase the organic and hydraulic treatment capacity of the plant to ensure

compliance with Condition 1.7. (Completion Date 31/12/2019).

3.2 Additional Measures

As the current storm water tank does not provide for 2h storage at the current 3 DWF, it is

recommended to provide additional storm water storage capacity. The required additional volume

based on the estimations in this report is 58m3.

25 | Irish Water

Appendix 7.4 – Priority Substances Assessment




xxvi | Irish Water

Table of Contents 1 Introduction 0

2 Desktop Study 0 2.1 Assessment of Analysis Required 0

2.2 Review outcome of Desktop study 1

3 Assessment of Significance and Recommendations 1

Appendix 1 – Screening of Parameters for Priority Substances

Appendix 2 – Priority Substance Screening Flowchart

Appendix 3 – Receiving Waters Priority Substance Data

0 | Irish Water

1 Introduction

This report has been prepared for D0069-01, Ballyhaunis, in County Mayo in accordance

with the requirements of Condition 4.20 and Schedule D of the wastewater discharge licence

for the agglomeration.

This desk top study has been undertaken to determine the necessity, if any, for analysis of the

discharge to comply with the condition in the wastewater discharge licence based on the

Guidance on the Screening for Priority Substances for Waste Water Discharge Licences,

issued by the EPA. Relevant inputs to the waste water works and estimates of emissions

from the discharge point have been taken into account in the preparation of this report.

Relevant inputs to the waste water works, any relevant measurements / calculations /

estimates of emissions from the discharge point and any relevant measurements undertaken at

representative downstream monitoring locations have been taken into account in the

preparation of this report.

Details of the emissions concentration for the primary discharge and impact on the receiving

water are included in Appendix 1.

2 Desktop Study

2.1 Assessment of Analysis Required

A. Review of all industrial inputs into WWTP

A list all licensed and unlicensed industrial or trade effluent discharges, leachate discharges

and other imports is included in Table 2.1 below. State if all trade / industrial discharges are

licensed and include any known unlicensed discharges. “Other Imports” includes any non-

domestic imports to the WWTP.

Table 2.1 – List of Non-Domestic Discharges to WWTP

Licensee Name

/ Landfill

Name /Other

Imports

Type of

Industry

Type of

Licence

(IED / IPPC /

Section 16 /

Unlicensed)

Potential Source

of Dangerous /

Priority

Substances (Yes

/ No)

Dangerous /

Priority

Substances

Monitoring

Undertaken (Yes

/ No)

Patrick Phillips Butchers S16 Yes Unknown

Where the answer to “Potential Source of Dangerous Substances (Yes / No)” is Yes, Table

2.2 below has been completed for each industry/landfill/other import source.

Table 2.2 – List of Dangerous or Priority Substances in Non-Domestic Discharges to

WWTP

Licensee Name List Anticipated Dangerous

Substances or state if unknown

Monitoring

Undertaken

(Yes / No)

Patrick Phillips VOC’s, Pesticides, Metals Unknown

B. Discharge monitoring

The primary discharge has been analysed for priority substances.

1 | Irish Water

Analysis data is included in Appendix 1 with details of the sample data and/or source of the

data. Analysis data does not include the full list of priority substances listed in the EPA’s

Guidance on the Screening for Priority Substances for Waste Water Discharge Licences.

C. Downstream monitoring location’s participation in relevant monitoring programme

Any analysis data available for a representative downstream monitoring location from the

discharge point for the relevant parameters is included in Appendix 3 with details of the

sample data and/or source of the data.

D. Participation in PRTR reporting

The emissions of specific organic compounds and metals (priority substances) have been

estimated for the discharge utilising the EPA’s urban WWTP calculation tool for PRTR

reporting. It is noted from the EPA’s report, An Inventory of Emissions to Waters in Ireland,

that extensive assessment of emission factors was undertaken during 2011 / 2012 that

focussed on the evaluation of inputs / output concentrations and removal efficiency using a

variety of different sized plants and wastewater treatment options. This has led to the

significant refinement of the electronic templates toolkit used for WWTP assessment using

the PRTR tool. The estimated emission data relevant to Ballyhaunis pertains to a WWTP

<10000 PE, No saline intrusion, tertiary treatment - filtration, nitrogen and phosphorus

removal.

The emission concentration from the PRTR has been included in the table in Appendix 1

where analysis data of the primary discharge is not available.

2.2 Review outcome of Desktop study

Following the desktop study, all parameters in Appendix 1 have been assessed to establish

any potential impact on the receiving waters. A review of all non-domestic loads to the

wastewater treatment plant is underway by Irish Water. A review of the national monitoring

programme for priority substances in wastewater is proposed to be undertaken by Irish Water

in 2016 in consultation with the EPA. It is proposed that this review, in consultation with the

EPA, will determine the scope of future Priority Substances monitoring at Irish Water

WWTP’s.

Priority substance concentrations in the primary discharge were available for all parameters

based on either analysis or the EPA PRTR toolkit. This desktop study is considered to

provide partial characterisation of the wastewater.

3 Assessment of Significance and Recommendations

An assessment of the potential for impacts on receiving waters from priority substances in the

primary discharge has been carried out. The assessment considers the primary discharge

relevant to Environmental Quality Standards (EQS) for priority substances in surface waters,

as set out in the European Communities Environmental Objectives (Surface Waters)

Regulations 2009, as amended.

No parameters have been identified as potentially being higher than the required EQS

following dilution therefore no impact on the receiving waters is anticipated.

Based on the assessment carried out it is not considered that any further sampling or analysis

is required.

The EPA have prepared a report on priority substances, An Inventory of Emissions to Waters

in Ireland. This document states that Ireland appears to have relatively few problems

associated with the presence of Priority / Priority Hazardous substances in its surface waters.

It identifies that wastewater discharges are a potential source of metals in receiving waters

2 | Irish Water

with lead being the main metal identified as associated with wastewater discharges.

However, metals exceedences, in particular those for cadmium, lead, and nickel are primarily

associated with areas of historic mining activity. Similarly PAH’s have been identified in

stormwater overflows but the most significant source is considered to be rainfall.

A consultation process with the EPA is proposed to be undertaken by Irish Water in 2016 to

establish appropriate levels of monitoring for priority and dangerous substances, taking into

account the particular requirements of the Water Framework Directive. This will allow a

targeted monitoring programme to be undertaken in areas where priority substances have

been identified or industrial discharges or imports provide a potential source, and where there

is a shortfall of existing monitoring data.

Does the assessment use the Desk Top Study Method or Screening Analysis to determine if the discharge contains the parameters in Appendix 1 of the EPA guidance

Desk Top Study and Screening Analysis

Does the assessment include a review of licensed / authorised inputs to the works?

Yes

Does the assessment include a review of other (unauthorised) inputs to the works?

Yes

Does the report include an assessment of the significance of the results where a listed material is present in the discharge? (e.g. impact on the relevant EQS standard for the receiving water)

Yes

Does the assessment identify that priority substances may be impacting the receiving water?

No

Does the Improvement Programme for the agglomeration include the elimination / reduction of all priority substances identified as having an impact on receiving water quality?

No

3 | Irish Water

Appendix 1 – Screening of Parameters for Priority Substances

AA: Annual Average

MAC: Maximum Allowable Concentration

EQS: Environmental Quality Standards

Dilution factor in receiving water: 13.37

No

. Compound

Group of

compound

s

AA-EQS

Inland

SW (µg/l)

AA-EQS

Other

SW

(µg/l)

Measured

/Estimate

d Conc.

(µg/l)1

Data Source

[Sample /

PRTR /

Other

(state)]

Sample Date

(if

applicable)

Effluent

Concentrati

on above

AA

concentratio

n (Yes/No)

Effluent

Concentrati

on above

AA

concentratio

n after

dilution

(Yes/No)

1 Benzene VOCs 10 8 0.0175 PRTR 2014 AER No No

2 Carbon tetrachloride VOCs 12 12 0.0000 PRTR 2014 AER No No

3 1,2-Dichloroethane VOCs 10 10 0.0000 PRTR 2014 AER No No

4 Dichloromethane VOCs 20 20 0.0459 PRTR 2014 AER No No

5 Tetrachloroethylene VOCs 10 10 0.0590 PRTR 2014 AER No No

6 Trichloroethylene VOCs 10 10 0.4937 PRTR 2014 AER No No

7 Trichlorobenzenes VOCs 0.4 0.4 0.0000 PRTR 2014 AER No No

8 Trichloromethane VOCs 2.5 2.5 0 PRTR No No

9 Xylenes (all isomers) VOCs 10 10 0.5 (50% of LOD)

Sample

880178275 17/7/08 No No

10 Ethyl Benzene VOCs n/a n/a 0.0175 PRTR 2014 AER n/a n/a

11 Toluene VOCs 10 10 0.5 (50% of LOD)

Sample

880178275 17/7/08 No No

12 Naphthlene2 PAHs 2 2 0.0044 PRTR 2014 AER No No

2 The EQS for these substances shall take effect from 22 December 2015

4 | Irish Water

No

. Compound

Group of

compound

s

AA-EQS

Inland

SW (µg/l)

AA-EQS

Other

SW

(µg/l)

Measured

/Estimate

d Conc.

(µg/l)1

Data Source

[Sample /

PRTR /

Other

(state)]

Sample Date

(if

applicable)

Effluent

Concentrati

on above

AA

concentratio

n (Yes/No)

Effluent

Concentrati

on above

AA

concentratio

n after

dilution

(Yes/No)

13 Fluoranthene1

PAHs 0.0063 0.0063 0.0022 PRTR 2014 AER No No

14 Benzo[k]fluoranthene3

PAHs MAC of 0.017

MAC of 0.017

0.0022 PRTR 2014 AER No No

15 Benzo[ghi]perylene2

PAHs MAC of

8.2 x 10-3

MAC of 8.2 x 10

-4 0.0022 PRTR 2014 AER Yes No

16 Indeno[1,2,3-

c,d]pyrene2 PAHs 0.0022 PRTR 2014 AER No No

17 Benzo[b]fluoranthene2 PAHs

MAC of 0.017

MAC of 0.017


18 Benzo[a]pyrene PAHs 1.7 x 10-4 1.7 x 10

-4 0.0022 PRTR 2014 AER Yes No

19 Di(2-ethylhexyl)phthalate (DEHP)

Plasticiser 1.3 1.3 0.9174 PRTR 2014 AER No No

20 Isodrin4 Pesticides

∑=0.01 ∑=0.005


21 Dieldrin3

Pesticides 0.0000 PRTR 2014 AER No No

3 No indicative parameter is provided for this group of substances

4 ∑ of Aldrin, Dieldrin, Endrin and Isodrin.

5 | Irish Water

No

. Compound

Group of

compound

s

AA-EQS

Inland

SW (µg/l)

AA-EQS

Other

SW

(µg/l)

Measured

/Estimate

d Conc.

(µg/l)1

Data Source

[Sample /

PRTR /

Other

(state)]

Sample Date

(if

applicable)

Effluent

Concentrati

on above

AA

concentratio

n (Yes/No)

Effluent

Concentrati

on above

AA

concentratio

n after

dilution

(Yes/No)

22 Diuron Pesticides 0.2 0.2 0.0262 PRTR 2014 AER No No

23 Isoproturon Pesticides 0.3 0.3 0.0066 PRTR 2014 AER No No

24 Atrazine Pesticides 0.6 0.6 0.0015 (50% of

LOD)

Sample

880178275 17/7/08 No No

25 Simazine Pesticides 1 1 0.058 Sample 17/7/08 No No

26 Glyphosate Pesticides 60 - 1.5334 PRTR 2014 AER No No

27 Mecoprop Pesticides n/a n/a 0.1070 PRTR 2014 AER n/a n/a

28 2,4-D Pesticides n/a n/a 0.0502 PRTR 2014 AER n/a n/a

29 MCPA Pesticides n/a n/a 0.0896 PRTR 2014 AER n/a n/a

30 Linuron Pesticides 0.7 0.7 0.0000 PRTR 2014 AER No No

31 Dichlobenil Pesticides n/a n/a 0.0044 PRTR 2014 AER n/a n/a

32 2,6-Dichlorobenzamide

Pesticides n/a n/a 0.0808 PRTR 2014 AER n/a n/a

33 PCBs PCBs n/a n/a 0.0000 PRTR 2014 AER n/a n/a

34 Phenols (as Total C) Phenols 8 8 0.0135 (50% of

LOD)

Sample

880178275 17/7/08 No No

35 Lead Metals 1.2 1.3 0.25 (50%

of LOD)

Sample

880178275 17/7/08 No No

36 Arsenic Metals 25 20 0.25 (50%

of LOD)

Sample

880178275 17/7/08 No No

6 | Irish Water

No

. Compound

Group of

compound

s

AA-EQS

Inland

SW (µg/l)

AA-EQS

Other

SW

(µg/l)

Measured

/Estimate

d Conc.

(µg/l)1

Data Source

[Sample /

PRTR /

Other

(state)]

Sample Date

(if

applicable)

Effluent

Concentrati

on above

AA

concentratio

n (Yes/No)

Effluent

Concentrati

on above

AA

concentratio

n after

dilution

(Yes/No)

37 Copper Metals 302 5

2.9991

PRTR 2014 AER No No

38 Zinc Metals 1003 40 102 Sample

880178275 17/7/08 Yes No

39 Cadmium Metals 0.254 0.2 0.25 (50%

of LOD)

Sample

880178275 17/7/08 Yes No

40 Mercury Metals MAC of

0.07 MAC of

0.07

0.025 (50% of

LOD)

Sample

880178275 17/7/08 No No

41 Chromium VI Metals 3.4 0.6 0.25 (50%

of LOD)

Sample

880178275 17/7/08 No No

42 Selenium Metals n/a n/a 0.25 (50%

of LOD)

Sample

880178275 17/7/08 n/a n/a

43 Antimony Metals n/a n/a 0.1551 PRTR 2014 AER n/a n/a

44 Molybdenum Metals n/a n/a 0.0000 PRTR 2014 AER n/a n/a

45 Tin Metals n/a n/a 0.1442 PRTR 2014 AER n/a n/a

46 Barium Metals n/a n/a 6 Sample

880178275 17/7/08 n/a n/a

47 Boron Metals n/a n/a 63 Sample

880178275 17/7/08 n/a n/a

48 Cobalt Metals n/a n/a 0.1747 PRTR 2014 AER n/a n/a

49 Vanadium Metals n/a n/a 2.7282 PRTR 2014 AER n/a n/a

7 | Irish Water

No

. Compound

Group of

compound

s

AA-EQS

Inland

SW (µg/l)

AA-EQS

Other

SW

(µg/l)

Measured

/Estimate

d Conc.

(µg/l)1

Data Source

[Sample /

PRTR /

Other

(state)]

Sample Date

(if

applicable)

Effluent

Concentrati

on above

AA

concentratio

n (Yes/No)

Effluent

Concentrati

on above

AA

concentratio

n after

dilution

(Yes/No)

50 Nickel Metals 4 8.6 1 Sample

880178275 17/7/08 No No

51 Fluoride General 500 1,500 600 Sample

880178275 17/7/08 Yes No

52 Chloride General n/a n/a 54118.40

26 PRTR 2014 AER n/a n/a

53 TOC General n/a n/a 9219.743

5 PRTR 2014 AER n/a n/a

54 Cyanide General 10 10 4.6 Sample

880178275 17/7/08 No No

Conductivity General n/a n/a

Hardness (mg/l

CaCO3) General n/a n/a 201.75 PRTR n/a n/a

pH General n/a n/a 6.8 Sample

880178275 17/7/08 n/a n/a

Notes:

1. Where measured values are available these should be used instead of estimated values from PRTR tool.

2. In the case of Copper the value 5 applies where the water hardness measured in mg/l CaCO3 is less than or equal to 100; the value 30

applies where the water hardness exceeds 100 mg/l CaCO3. Estimated CaCO3 value > 100 where no sampling data available (based on

PRTR tool)

3. In the case of Zinc, the standard shall be 8 μg/l for water hardness with annual average values less than or equal to 10 mg/l CaCO3, 50

μg/l for water hardness greater than 10 mg/l CaCO3 and less than or equal to 100 mg/l CaCO3 and 100 μg/l elsewhere. Estimated

CaCO3 value > 100 where no sampling data available

8 | Irish Water

4. For Cadmium and its compounds the EQS values vary dependent upon the hardness of the water as specified in five class categories

(Class 1: <40 mg CaCO3/l, Class 2: 40 to <50 mg CaCO3/l, Class 3: 50 to <100 mg CaCO3/l, Class 4: 100 to <200 mg CaCO3/l and

Class 5: _200 mg CaCO3/l)

9 | Irish Water

Appendix 2 – Priority Substance Screening Flowchart

A flow chart for the screening of the presence of organic compounds and metals (Priority

Substances) from WWTP is included below. This flowchart shows that appropriate screening

has been demonstrated in line with the assessment undertaken in this report.

Partial Characterisation

Screening for presence of organic compounds and metals (priority substances) with regard to the

parameters listed in Appendix 1

Depending on size of agglomeration / location carry out either one of the following: desktop study

OR analysis of primary discharge

Desktop study

A. Review all industrial inputs including septic tank /

package treatment plants and leachate to the WWTP

B. Ascertain if discharge(s) is/are part of any screening /

monitoring programme

C. Ascertain if a representative downstream monitoring point is part of any screening / monitoring

point

D. Ascertain if emissions data from WWTP

calculated / estimated

Review / outcome of desktop study

Partial characterisation

Undertake analysis for the outstanding parameters

Revisit A above and undertake analysis of relevant parameters

Analysis for outstanding parameters to be undertaken in 2016 to complete screening process

Scope and frequency of subsequent monitoring to be agreed with the

Agency

10 | Irish Water

Appendix 3 – Receiving Waters Priority Substance Data

No. Compound

AA-

EQS

Inlan

d SW

(µg/l)

Measured

/Estimate

d Conc.

(µg/l)1

Data

source Date

Sample above

AA EQS

Concentratio

n

9 Xylenes (all isomers) 10 0.5 (50% of

LOD)

Sample

88017821

3

17/07/2008

No

11 Toluene 10 0.5 (50% of

LOD)

Sample

88017821

3

17/07/2008

No

24 Atrazine 0.6 0.0015 (50% of LOD)

Sample

88017821

3

17/07/2008

No

25 Simazine 1 0.008

Sample

88017821

3

17/07/2008

No

34 Phenols (as Total C) 8 0.0135 (50% of LOD)

Sample

88017821

3

17/07/2008

No

35 Lead 1.2 0.25 (50% of LOD)

Sample

88017821

3

17/07/2008

No

36 Arsenic 25 0.25 (50% of LOD)

Sample

88017821

3

17/07/2008

No

38 Zinc 1003

2.5 (50% of LOD)

Sample

88017821

3

17/07/2008

No

39 Cadmium 0.254

0.25 (50% of LOD)

Sample

88017821

3

17/07/2008

No

40 Mercury

MAC of

0.07

0.025 (50% of LOD)

Sample

88017821

3

17/07/2008

No

41 Chromium 3.4 0.25 (50% of LOD)

Sample

88017821

3

17/07/2008

No

42 Selenium n/a 0.25 (50% of LOD)

Sample

88017821

3

17/07/2008

n/a

46 Barium n/a 37

Sample

88017821

3

17/07/2008

n/a

47 Boron n/a 14 Sample 17/07/200

8 n/a

11 | Irish Water

88017821

3

50 Nickel 4 2

Sample

88017821

3

17/07/2008

No

51 Fluoride 500 160

Sample

88017821

3

17/07/2008

No

54 Cyanide 10 0.35 (50% of LOD)

Sample

88017821

3

17/07/2008

No

Conductivity n/a 639

Sample

88017821

3

17/07/2008

Hardness (mg/l CaCO3) n/a 289

Sample

88017821

3

17/07/2008

pH n/a 7.8

Sample

88017821

3

17/07/2008

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