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PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Chesapeake Bay Pollution Reduction Plan
Instructor: Julie Schneider, Watershed Planner CWP
Bryan Seipp, Watershed Manager, CWP
Ruth Hocker, PA Senior Scientist CBF
June 10, 2014
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PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
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PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 3
Chesapeake Bay Foundation
Largest and oldest non-profit dedicated to restoring
the Chesapeake Bay and its tributary rivers and streams
Environmental education for adults and
schoolchildren in PA, MD and VA
Advocacy at the local, state and federal level, and
help for communities
Restoration program for filters: forested stream
buffers, oysters, etc.
www.cbf.org
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 4
Center for Watershed Protection
Stormwater and watershed
guidance documents
National MS4 Expertise
Hands-on technical assistance
www.cwp.org
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 5
Presentation Overview
Introduce the Chesapeake Bay Pollution Reduction Plan
How to develop a Plan using PA DEP’s 4 step process
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 6
Chesapeake Bay TMDL
A pollution diet for a local
waterbody.
TMDL=
Wasteload allocations (MS4
system, WWTP, industrial
point sources) +
Load allocations (septic,
agriculture) +
Margin of safety
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 7
PA DEP Requirements for Section B: Chesapeake
Bay Pollution Reduction Plan
Four Steps:
1. Narrative of MS4
2. Incorporate GI/LID/ESD into municipal infrastructure
upgrades
3. Estimate current pollutant loads (optional)
4. Identify TMDL control measures
PA DEP Document 3800-FM-BPNPSM0493 8/20/13
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 8
Step 1. Narrative of MS4
Drainage area of MS4 within the UA discharging to the
Chesapeake Bay Watershed:
1. Pervious and impervious cover (%)
2. Land use (acres)
3. Stream miles (note impaired streams) (linear feet)
*Sources of GIS data included on resource sheet
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 9
Step 1. Narrative of MS4
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 10
Step 1. Narrative of MS4
*Use local data when available
Data Source
Impervious Cover Chesapeake Bay Program
Land Use USGS National Land Cover Database
Streams PASDA
Boundary layers (municipal, county boundary, etc.)
PASDA, CBP
Urbanized Area U.S. Census Bureau
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 11
Step 1. Narrative of MS4
PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Step 1. Narrative of MS4
• Other information to include:
– Areas not included
• Large federal facilities (not responsible for)
• Other permitted entities
– Watersheds and tributary streams in MS4
– High quality areas
– Protected lands
– Population stats
– Other relevant information
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PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Army Depot in Fairview Township
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PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 14
Chesapeake Bay Pollution Prevention Plan
(CBPRP)
Four Steps:
1. Narrative of MS4
2. Incorporate GI/LID/ESD into municipal infrastructure
upgrades
3. Estimate current pollutant loads (optional)
4. Identify TMDL control measures
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 15
Step 2. Incorporate GI/LID/ESD into
Municipal Infrastructure Upgrades
• Green Infrastructure (GI)
• Low Impact Development (LID)
• Environmental Site Design (ESD)
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 16
Step 2. Incorporate GI/LID/ESD into
Municipal Infrastructure Upgrades
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 17
Step 2. Incorporate GI/LID/ESD into
Municipal Infrastructure Upgrades
PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
• Example I
– Street Widening project on Main Street
• Options Considered– Bioretention
– Porous Pavement
• Considerations– On-street Parking
– Mature Trees
• Result– Neither option is feasible here because most residences do
not have driveways and loss of parking for street scape bioretention is not acceptable to community.
– Potential damage to large mature trees during construction and concerns of clogging due to leaf litter result in porous pavement being unacceptable.
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PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
• Example II– New Township Park
• Options Considered
– Bioretention in parking lot
– Stream restoration with floodplain connection and forest buffer
• Considerations
– Costs
– Permits
– Construction timeline
• Result
– Bioretention will be implemented along the down slope perimeter of the parking lot as well as in the parking lot islands
– Stream restoration will occur in phases with phase 1 occurring at the time of park development and phases 2 and 3 occurring in subsequent years.
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PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 20
Chesapeake Bay Pollution Prevention Plan
(CBPRP)
Four Steps:
1. Narrative of MS4
2. Incorporate green infrastructure into municipal
infrastructure upgrades
3. Estimate current pollutant loads (optional)
4. Identify TMDL control measures
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 21
Step 3. (Optional)
Estimate Current Pollutant Loads
Benefits:
1. Provide a baseline pollutant load for your municipality
2. Account for what you and your partners (watershed groups,
schools, etc) have done
3. Have a better understanding of current rate of progress.
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 22
Step 3. (Optional)
Estimate Current Pollutant Loads
Modeling programs
MapSheds (GWLF)- PSU www.mapshed.psu.edu/
Chesapeake Assessment and Scenario Tool (CAST)- CBP www.casttool.org
Others Watershed Treatment Model
http://www.cwp.org/online-watershed-library/ See CBF webcast on modeling
PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Data requirements
• Minimum
– BMP type and acres treated (or area for land-use change BMPs)
• Better
– BMP type, acres treated and % impervious
• Best
– BMP type, acres treated, % impervious, land use type, and amount of runoff retention (i.e. 1”, 2.5”, etc.)
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PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 24
Step 3. (Optional)
Estimate Current Pollutant Loads
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 25
Summary of Reported BMPs Installed from 2007-2014
BMP Type Impervious Drainage Area (Acres)
Pervious Drainage Area (Acres)
Acres Linear Feet
Stream Restoration
0 0 0 5,000
Forest Buffer 0 0 5.00
Wet Pond/Wetland
40 50 0 0
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 26
Step 3. (Optional)
Estimate Current Pollutant Loads
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 27
Chesapeake Bay Pollution Prevention Plan
(CBPRP)
Four Steps:
1. Narrative of MS4
2. Incorporate green infrastructure into municipal
infrastructure upgrades
3. Estimate current pollutant loads (optional)
4. Identify TMDL control measures
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 28
Step 4. Identify TMDL Control Measures
Identify TMDL control measures and include:
1. Location of BMPs (latitude/longitude, street name, other)
2. Implementation schedule including interim milestones
3. BMP pollutant reduction for N, P and/or Sediment
4. Rationale for selecting the BMP
5. BMP Inspection, operation and maintenance
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 29
Location of BMPs
Existing Resources:
Watershed plans,
stream assessments,
etc.
Conduct Field
Assessments:
opportunities at
public lands, public
sites needing upgrade
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 30
TMDL Control Measures1. Establish and Protect Riparian Forest Buffers – restore vegetated buffer
areas2. Disconnection Program – Disconnect impervious areas from your regulated
small MS4 system3. Tree Planting – Plant trees within the area that drains to the regulated small
MS4.4. Construct Recharge / Infiltration Facilities5. Stormwater Basin Retrofits – Naturalize or modify for extended detention,
and/or modify basins for increased infiltration6. Restore Stream banks – Restore and/or stabilize degraded and eroded stream
banks7. Establish Green Infrastructure at Facilities that are owned by the
municipality and that drain to the regulated small MS48. Develop and implement additional provisions to address TMDLs or a
separate MS4 TMDL Stormwater Management Ordinance9. Participate in an approved Trading and Offset Program
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 31
Location of BMPs
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 32
Project ID
Jurisdiction/Party Project Name
Project Type Latitude Longitude
1 City of Yellow Main Street Greenway Bioretention 39.966512 -76.719948
2 East Township Baseball Fields Bioretention 40.013022 -76.593407
3 Main TownshipMain Township Municipal Complex Bioretention 40.021230 -76.752979
4West Main Township Summer Park Bioretention 39.968734 -76.801098
5 Hamish Township Broad Street Bioswale 40.029241 -76.615090
6Spring Valley Township Michigan Ave Pond Retrofit 39.942421 -76.727789
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 33
Location of BMPs
Project ID Jurisdiction/Party Project Name Project TypeRepresented As Type Latitude Longitude
1City of York Broad Street Greenway Bioretention Bioretention 39.966512 -76.719948
2Hellam Township Barshinger Fields Bioretention Bioretention 40.013022 -76.593407
3Manchester TownshipManchester Township Municipal Complex Bioretention Bioretention 40.021230 -76.752979
4West Manchester Township Sunset Park Bioretention Bioretention 39.968734 -76.801098
5Hellam Township Ore Bank & Spring Rd Bioswale Bioswale 40.029241 -76.615090
6Spring Garden Township Virginia Ave Step Pool Conveyance Bioswale 39.942421 -76.727789
7York Township MD & PA CG trail extension Bioswale Bioswale
8City of York Rail Trail (Market-Kings Mill) Porous Pavement Pervious Pavement 39.945070 -76.742459
9Fairview Township Pinetown Road-Bike/Ped area Pervious Pavement Pervious Pavement
10York Township Mill Creek Preserve- Parking Lot Porous Pavement Pervious Pavement 39.945222 -76.661865
11York Township York Township Park- Parking Lot/Trail porous Pavement Pervious Pavement 39.922073 -76.679483
12City of York York City Industrial Park Pond Retrofit Pond Retrofit 39.983600 -76.750500
13Dover Township Wyngate Basin Pond Retrofit Pond Retrofit 39.983333 -76.839722
14Dover Township Dover Township Community CenterPond Retrofit Pond Retrofit 39.979444 -76.837500
15Fairview Township Emily Lane Stormwater Pond Pond Retrofit Pond Retrofit 40.18 -76.84
16Hellam Township 102 Chelsea Way Pond Retrofit Pond Retrofit 40.025035 -76.626763
17Manchester Township I-83 Basin Pond Retrofit Pond Retrofit 40.040252 -76.746611
18Shrewsbury Township Deer Creek Initiative- Grace Church Pond Retrofit #1 Pond Retrofit 39.766448 -76.667039
19Shrewsbury Township Deer Creek Initiative- Grace Church Pond Retrofit #2 Pond Retrofit 39.770254 -76.668628
20Shrewsbury Township Deer Creek Initiative- Giant Food Pond Retrofit #3 Pond Retrofit 39.772058 -76.668946
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 34
Calculate Pollutant Load Reduction
Determine Land Use Load rate from CAST or MapSheds
Calculated using % pollutant load reduction % from CAST
Model for N, P and TSS
Stream restoration and street sweeping pollutant load
reductions from Bay Program and expert panels
PA BMP manual currently being updated
Local data on stream restoration
Optional- Calculated planning level cost data for each BMP
(King and Hagan, 2011)
PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Land-use Loading Rate
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PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Land-Use Loading for TN
Landuse Acres
Lbs Nitrogen Lbs/ac TN Lbs Nitrogen Lbs/ac TN
Edge of Stream EOS Delivered DEL
regulated impervious developed
26,092.10 814,582.10 31.22 572,854.00 21.96
regulated pervious developed
78,853.40 1,565,997.20 19.86 1,070,388.00 13.57
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For spreadsheet use Edge of Stream
PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Example for TNBioretention (B soils w/ underdrain) at School Parking Lot
• Treats 1.2 acres (75% impervious)
– (0.75) * 1.2 ac = 0.9 acres impervious and 0.3 acres pervious
• 0.9 ac * 31.22 lbs/ac TN = 28.09 lbs/yr
• 0.3ac * 19.86 lbs/ac TN = 5.96 lbs/yr
• Total TN load to BMP = 34.05 lbs/yr
– BMP reduction efficiency for TN= 70%
• 34.05 lbs TN *0.70= 23.84 lbs/yr reduction in TN
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PA Municipal Separate Storm Sewer System (MS4) TMDL Plan
Example Pollutant Load Reduction Spreadsheet
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Proj ID Name Location Proj Type Amount Unit TN RedLbs/yr
TP RedLbs/yr
TSS RedLbs/yr
$/est.(optional)
1 Little Big Run Lat/Long Stream Restoration
1200 Feet 359 122 970000 $250,000
2 Smart Kids Elementary School
Street Address
Bioretention
1.5 Acres Treated
175 95 130000 $34,000
3 MunicipalBuilding
StreetAddress
PondRetrofit
7.5 Acres Treated
292 175 9000 $50,000
4 TownshipPark
Lat/Long ForestBuffer
4 acres 94 27 1200 $4,500
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 39
Pollutant Load Reduction Summary
Compare current loads (step 3) to projected load reduction
from planned BMPs (step 4) to show progress (% reduction)
TN TP TSS
Current Load (includes voluntary and redevelopment projects)
A lbs/yr
Future planned projects B
Percent Reduction B x100A
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 40
Matching Load Reductions with WIP II Goals
• Development of WIP II goals– Developed using Chesapeake Bay Model/CAST tool
• One advantage to using CAST– GWLF (MapSheds) may have been used to develop local TMDL
– Goals often reflect delivered loads– CAST tool provides Edge of Stream and Delivered Loads– To estimate Delivered loads in CAST
• Aggregate each practice type• Enter data• Run Model
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 41
BMP Type Impervious Drainage Area (Acres)
Pervious Drainage Area (Acres)
Acres Linear Feet
Stream Restoration
0 0 0 2,000
Forest Buffer 0 0 5.00
Infiltration w/sand
20 5 0 0
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 42
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 43
Project Implementation Schedule
Near Term Projects – little to no permits or permits in process,
ownership public or private with cooperating landowner, some
partial funding or design
Mid Term Projects – public ownership, limited permits
Long Term Projects- longer permit requirements, ownership
issues
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 44
Appendix
Description of Inspection, Operation, and Maintenance of BMPs. For most standard BMPs this information can easily be
found in state stormwater manuals. Proprietary BMPs should have information from vendor.
Include information on rationale for selecting BMP especially if not one of the TMDL control measures or experimental.
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 45
Next Steps
Track BMP project implementation Refine pollutant load reduction Continue to evaluate planned public municipal infrastructure
upgrades Show incremental progress- project location, when
constructed, etc.
PA Municipal Separate Storm Sewer System (MS4) TMDL PlanChesapeake Bay Pollution Reduction Plan 46
Next Steps
Track BMP project implementation Refine pollutant load reduction Continue to evaluate planned public municipal infrastructure
upgrades Show incremental progress- project location, when
constructed, etc.
Questions?