Pollution Reduction Plan for Wilkins

200 West Kensinger Drive, Suite 400 Cranberry Township, PA 16066 (724) 779-4777 [Phone] (724) 779-4711 [Fax] www.hrg-inc.com

AUGUST 2017

NPDES STORMWATER DISCHARGES FROM SMALL MS4s POLLUTANT REDUCTION PLAN

WILKINS TOWNSHIP ALLEGHENY COUNTY, PENNSYLVANIA

HRG Project No. 006303.0438

©Herbert, Rowland & Grubic, Inc., 2017

TABLE OF CONTENTS

A. Public Participation ...... 1 B. Map ...... 1 C. Pollutants of Concern ...... 1 D. Determining Existing Loading for Pollutants of Concern ...... 2 E. Select BMPs to Achieve the Minimum Required Reductions in Pollutant Loading ...... 3 F. Identify Funding Mechanisms ...... 5 G. Identify Responsible Parties for Operation and Maintenance (O&M) of BMPs ...... 6

TABLES

1. Outfall Drainage Areas 2. Existing Loading Rate 3. Street Sweeping 4. Vegetated Open Channels (C/D Soils) 5. Stream Restoration 6. Wet Ponds and Wetlands 7. Infiltration Practices w/ Sand, Veg. 8. Pollutant Loading Reduction Summary 9. Funding Opportunities 10. Operation and Maintenance of BMPs

APPENDIX

A. PRP for Public Review B. Public Notice for PRP Review C. Public Comments on PRP D. Map E. Outfall Drainage Areas F. Requirements Map G. Requirements Table H. Pollutant Aggregation Suggestions I. Loading Rates for PA Counties J. Statewide MS4 Land Cover Estimates K. BMP Effectiveness Values L. PennDOT Type 5 Map M. BMP Estimated Costs N. Funding Opportunities O. BMP O&M Activity and Frequency

P:\0063\006303_0438\Admin\Permits\MS4\Narrative\Wilkins Township MS4 PRP Narrative.doc

POLLUTANT REDUCTION PLAN WILKINS TOWNSHIP ALLEGHENY COUNTY, PENNSYLVANIA

A. Public Participation

The Pollutant Reduction Plan (PRP) for Wilkins Township was made available to the public on August 1, 2017. A printed copy was available for public review at the Township Building during regular business hours. The Township also posted the PRP on the Township website, www.wilkinstownship.com (Appendix A).

A public notice was published by Wilkins Township in the Pittsburgh Post-Gazette on July 28, 2017 (Appendix B). The notice contained a statement describing the PRP, where it may be reviewed by the public, and the length of time the municipality would provide for the receipt of comments.

Comments from the public were received by mail, email, and at a Public Meeting on August 14, 2017 (Appendix C). Most of the comments noted: TBD.

Once the comments were reviewed by the municipality and engineer, the PRP was adjusted by TBD.

B. Map

The map for the PRP is attached in Appendix D. All relevant information pertaining to the PRP is presented on the map. The map is in GIS format and contains data from reliable sources: DCNR, PA EMAP, PASDA, PennDOT, and Wilkins Township.

The drainage areas for the MS4 outfalls are shown on the map, but the drainage areas are not extended past the municipal boundary of Wilkins Township and do not include state/railroad right-of-ways in order to define the MS4 planning area. Drainage areas for private and state storm sewer systems were not determined.

C. Pollutants of Concern

A breakdown of the MS4 outfalls, drainage areas, stream names, impairments, and subsequent sediment/nutrients loading designations are available in Appendix E. A summary of Appendix E is shown below in Table No. 1. Please see Appendix F, G, and H for more information regarding the relevant watersheds and streams for the permit.

The pollutant of concern is sediment. Sediment is the pollutant of concern for Chalfant Run, Sawmill Run, Thompson Run, and Turtle Creek. Wilkins Township’s MS4 outfalls discharge to Chalfant Run, Trib 37213 to Chalfant Run, Sawmill Run, Thompson Run, and Trib 37205 to Turtle Creek. None of Wilkins Township’s MS4 outfalls discharge to Turtle Creek (receives discharge from Thompson Run) or the Monongahela River (receives discharge from Turtle Creek).

Pollutant Reduction Plan Wilkins Township, Allegheny County, Pennsylvania

Table No. 1 Outfall Drainage Areas Total Sediment/Nutrients Number of Stream Name Impairments Drainage Loading Designation MS4 Outfalls Area (acres) Abandoned Mine Chalfant Run Sediment 34 147.347 Drainage – Siltation Trib 37213 to Natural Sources – Sediment 24 70.602 Chalfant Run Siltation Source Unknown – Monongahela River - - - PCB Source Unknown – Sawmill Run Sediment 43 225.107 Siltation Abandoned Mine Drainage – Metals ; Sediment Thompson Run 30 214.184 Abandoned Mine (Turtle Creek) Drainage – pH Abandoned Mine Turtle Creek Sediment - - Drainage – Siltation Trib 37205 to Channelization – Other Sediment 3 9.644 Turtle Creek Habitat Alterations

D. Determining Existing Loading for Pollutants of Concern

The existing loading rate was determined in July 2017 based on the available data at the time. DEP’s simplified method was used to calculate the existing loading rate.

The planning area is defined as the drainage areas of the MS4 outfalls, as shown in Appendix D. The drainage areas shown on the map are not extended past the municipal boundary of Wilkins Township and do not include state/railroad right-of-ways in order to define the MS4 planning area. The planning area for Wilkins Township is 666.884 acres (sum of total drainage areas from Table No. 1) and the total existing sediment loading rate for Wilkins Township is approximately 502,105 lbs/year (see Appendix I and J for loading rates and land cover estimates).

Table No. 2 Existing Loading Rate Existing Existing Sediment Area Sediment Category Land Cover Loading Rate (acres) Loading Rate (lbs/acre/yr) (lbs/year) Inside Urbanized Area 31% Impervious Developed 1,839 206.734 380,184 Inside Urbanized Area 69% Pervious Developed 264.96 460.150 121,921 Outside Urbanized Area Undeveloped 234.6 0 0

Pollutant Reduction Plan Wilkins Township, Allegheny County, Pennsylvania

E. Select BMPs to Achieve the Minimum Required Reductions in Pollutant Loading

The minimum required reduction in pollutant loading for Wilkins Township is 10% of the existing sediment loading rate for the municipality. Therefore, the required reduction is 10% of 502,105 lbs/year (50,211 lbs/year).

Five Best Management Practices (BMPs) are proposed to achieve the minimum required reduction in pollutant loading: Street Sweeping, Vegetated Open Channels (C/D Soils), Stream Restoration, Wet Ponds and Wetlands, and Infiltration Practices w/ Sand, Veg. (see Appendix K for BMP effectiveness values and descriptions).

Street Sweeping is proposed as a BMP and will require street sweeping of all municipal roadways 25 times/year. The sediment loading reduction for street sweeping was calculated by multiplying the BMP effectiveness value by the impervious sediment loading rate and by the assumed impervious area of the municipal roadways. The area of the municipal roadways was determined by multiplying the municipal road mileage listed on the PennDOT Type 5 Map (Appendix L) by the 1.0 impervious acre/curb-mile assumption via the Expert Panel Report for Street and Storm Drain Cleaning Practices. Although some of the municipal roadways for Wilkins Township are located outside of the PRP planning area, all of the roadways are located inside of the urbanized area and within the Turtle Creek watershed.

Table No. 3 Street Sweeping Total Length Area of Sediment Total Curb Miles Sediment BMP of Municipal Municipal Loading of Municipal Loading Rate Effectiveness Roadways Roadways Reduction Roadways (miles) (lbs/ac/year) Value (miles) (acres) (lbs/year) 24.97 49.94 49.94 1,839 9% 8,266

Vegetated Open Channels (C/D Soils) is proposed as a BMP and will require the replacement of a concrete channel in the Queenston Drive area that discharges to Thompson Run. Wilkins Township intends to replace the existing concrete channel with a vegetated channel (w/ turf reinforcement matting) in the near future due to erosion concerns. C/D soils are assumed due to the proximity of the channel to roadway runoff. The sediment loading reduction for the vegetated open channel was calculated by multiplying the BMP effectiveness value by the distribution of impervious/pervious developed sediment loading rate (per the simplified method) and by the drainage area of the proposed channel.

Table No. 4 Vegetated Open Channels (C/D Soils) 31% Sediment 69% Pervious Sediment BMP Drainage Impervious Loading Developed Loading Rate Effectiveness Area (acres) Developed Reduction (lbs/year) (lbs/year) Value (lbs/year) (lbs/year) 18.508 10,551 3,384 13,935 50% 6,968

Pollutant Reduction Plan Wilkins Township, Allegheny County, Pennsylvania

Stream Restoration is proposed as a BMP and will require the restoration of a 100’ section of Sawmill Run. The restoration will occur as part of a sanitary sewer relocation project and the stream banks will be stabilized as a result of the project. The sediment loading reduction for the stream restoration was calculated by multiplying the length of the proposed stream restoration by the sediment loading rate (per the simplified method).

Table No. 5 Stream Restoration Sediment Loading Rate Sediment Loading Reduction Length of Restoration (ft) (lbs/ft/year) (lbs/year) 100 44.88 4,488

Wet Ponds and Wetlands are proposed as BMPs and will require the conversion of an upstream drainage ditch to a wet pond/wetland. The ditch is located at the northern end of Lions Park, just to the east of the playground. The ditch discharges to a culvert that flows underneath Lions Park and then discharges to a tributary of Sawmill Run. In order to implement a wet pond/wetland, an outlet structure will need to be added to the upstream end of the culvert. The sediment loading reduction for the wet pond/wetland was calculated by multiplying the BMP effectiveness value by the distribution of impervious/pervious developed sediment loading rate (per the simplified method) and by the drainage area of the proposed wet pond/wetland.

Table No. 6 Wet Ponds and Wetlands 31% Sediment 69% Pervious Sediment BMP Drainage Impervious Loading Developed Loading Rate Effectiveness Area (acres) Developed Reduction (lbs/year) (lbs/year) Value (lbs/year) (lbs/year) 22.611 12,890 4,134 17,024 60% 10,214

Infiltration Practices w/Sand, Vegetation is proposed as a BMP and will require the construction of infiltration trenches along the toe of slope in Lions Park (Sawmill Run watershed) and Eastmont Park (Chalfant Run watershed). Both parks are chosen as locations for infiltration trenches in order to promote redundancy in the PRP. The infiltration trenches will include sand as part of their strata, vegetation, and will not contain underdrains. The trenches are also assumed to be placed in suitable soils due to the lack of development along the proposed locations. The sediment loading reduction for the infiltration trenches was calculated by multiplying the BMP effectiveness value by the distribution of impervious/pervious developed sediment loading rate (per the simplified method) and by the drainage area of the proposed infiltration trenches.

Pollutant Reduction Plan Wilkins Township, Allegheny County, Pennsylvania

Table No. 7 Infiltration Practices w/ Sand, Veg. 31% 69% Sediment Sediment Drainage BMP Impervious Pervious Loading Loading Park Area Effectiveness Developed Developed Rate Reduction (acres) Value (lbs/year) (lbs/year) (lbs/year) (lbs/year) Lions 24.702 14,082 4,516 18,598 17,668 95% Eastmont 12.865 7,334 2,352 9,686 9,202

In total, the proposed BMPs will reduce Wilkins Township’s sediment loading by 56,806 lbs/year (11.3%).

Table No. 8 Pollutant Loading Reduction Summary Existing Sediment Loading (lbs/year) 502,105 Minimum Required Reduction (lbs/year) 50,211 Street Sweeping (lbs/year) 8,266 Vegetated Open Channels (C/D Soils) (lbs/year) 6,968 Stream Restoration (lbs/year) 4,488 Wet Ponds and Wetlands (lbs/year) 10,214 Infiltration Practices w/ Sand, Veg. (lbs/year) 26,870 Total Proposed Reduction (lbs/year) 56,806 Difference Between Proposed and Required Reduction (lbs/year) 6,595

F. Identify Funding Mechanisms

Several funding opportunities are available for the proposed BMPs (see below). The estimated initial cost and estimated yearly O&M cost of the proposed BMPs were determined by information provided in the Pennsylvania Stormwater Best Management Practices Manual. Please see Appendix M for a breakdown of the cost estimates and Appendix N for more information regarding potential funding sources.

Table No. 9 Funding Opportunities Estimated Initial Estimated Yearly BMP Potential Funding Source Cost O&M Cost Street Sweeping $150,000 $18,750 Vegetated Open $30,000 $1,125 Stormwater Fee Channels (C/D Soils)

Stream Restoration $20,000 Negligible BMP Construction – PENNVEST Wet Ponds and $7,500 $150 Wetlands Growing Greener Grants Infiltration Practices $71,200 $3,560 w/ Sand, Veg. 5

Pollutant Reduction Plan Wilkins Township, Allegheny County, Pennsylvania

G. Identify Responsible Parties for Operation and Maintenance (O&M) of BMPs

All of the proposed BMPs will require operation and maintenance schedules in order for the BMPs to produce the expected pollutant reductions. The parties responsible for ongoing O&M, the activities involved with O&M for each BMP, and the frequency at which O&M activities will occur are listed below. Please see Appendix O and the Pennsylvania Stormwater BMP Manual for more information regarding O&M activity and frequency for each BMP.

Table No. 10 Operation and Maintenance of BMPs Responsible BMP O&M Activity and Frequency Party See Appendix O and Pennsylvania Stormwater Street Sweeping BMP Manual Section 5.9.1 See Appendix O and Pennsylvania Stormwater Vegetated Open Channels (C/D Soils) BMP Manual Section 6.4.8 Wilkins See Appendix O and Pennsylvania Stormwater Stream Restoration Township BMP Manual Section 6.7.4 DPW Staff See Appendix O and Pennsylvania Stormwater Wet Ponds and Wetlands BMP Manual Section 6.6.1 and 6.6.2 See Appendix O and Pennsylvania Stormwater Infiltration Practices w/ Sand, Veg. BMP Manual Section 6.4.4

APPENDIX A

PRP FOR PUBLIC REVIEW

APPENDIX B

PUBLIC NOTICE FOR PRP REVIEW

APPENDIX C

PUBLIC COMMENTS ON PRP

APPENDIX D

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0 E 1 e M V 7 M APLE S 40 6 e T 0 A 0 k 0 E 1 8 0 0 0 R 0 8 0 T W 0 M 1 0 2 6 W 9 9 1 S Y 2 A 1 E C A 1 T T I R A 1 K FOURTH T ST D E S V I 7 V I V R N I D N S T I 8 S D E S F S 0 T O H G T OW N R A A T L RD R A V N ST E N I A S K R S L S B A A E L R A A P I E D L L N A V T I V C N M L G L R E S S A R 0 S N I TH E L A D IRD E 2 C I I ST O O A N N V V 8 N E D N D V O S G C L I T S M d E N FRAN T x KL IN A O ST A A S 0 O T V 900 m T 8 H . C 9 S V t 7 20 r C T O EN 820 o TER AV p 6 3 x 4 2 _ 4 S 600 0 600 Land Use M Inlet Infiltration Trench Infiltration Trench Drainage Area 20' Contour Impaired Stream Rangeland \ Feet MS4 Map s t [ c e j Mapping derived from data provided by Allegheny County, PA DEP, Agricultural Wilkins Township o r PAMAP, PennDOT, SPC, US Census, USGS, and Wilkins Township. Manhole Pipe Vegetated Channel Drainage Area Local Road Stream Restoration Urban Built-Up P \ S I Allegheny County, Pennsylvania

G Barren Land \ 7/13/2017 PM:RLA GIS: HMG QA: BLS R006303.0438 Water

8 Outfall Swale Wetland/Wet Pond Drainage Area State Road Municipal Boundary 3 4

0 200 West Kensinger Drive

_ Forest 3 Suite 400

0 Other Storm Structure Vegetated Channel Storm Sewer Shed Railroad Urban Area (2010) 3 Cranberry Township, PA 16066 6 0

0 724.779.4777 [phone] \

3 State Drainage Feature Wetland/Wet Pond Watershed

6 724.779.4711 [fax] 0 0

\ www.hrg-inc.com : P

APPENDIX E

OUTFALL DRAINAGE AREAS

Outfall Drainage Areas

Stream Name Chalfant Run Impairments Abandoned Mine Drainage – Siltation Sediment/Nutrients Loading Designation Sediment Number of MS4 Outfalls 34 Total Drainage Area 147.347 acres Structure ID Area (acres) Structure ID Area (acres) Structure ID Area (acres) OF-100.2 0.815 OF-43 24.338 OF-90 8.010 OF-176 11.090 OF-43.1 12.092 OF-91 1.380 OF-177 1.927 OF-43.2 6.474 OF-96 3.143 OF-178 1.488 OF-44 4.918 OF-97 4.765 OF-179 1.509 OF-55 6.232 OF-98 3.092 OF-180 1.535 OF-56 4.227 S-660 1.867 OF-181 1.182 OF-62 1.501 S-880 1.543 OF-182 1.093 OF-85 2.254 S-883 2.637 OF-182.1 2.141 OF-86 1.705 S-884 0.609 OF-183 2.299 OF-87 7.713 S-886 1.981 OF-42 9.366 OF-89 1.691 OF-42.1 8.380 OF-890 2.347

Stream Name Trib 37213 to Chalfant Run Impairments Natural Sources – Siltation Sediment/Nutrients Loading Designation Sediment Number of MS4 Outfalls 24 Total Drainage Area 70.602 acres Structure ID Area (acres) Structure ID Area (acres) Structure ID Area (acres) OF-116 1.067 OF-126 1.883 OF-77 9.266 OF-118 0.718 OF-127 1.566 OF-79.1 17.073 OF-119 0.620 OF-70 0.287 OF-80 6.296 OF-120 1.110 OF-72 0.793 OF-81 1.691 OF-122 1.628 OF-73 0.389 OF-82 1.241 OF-123 1.128 OF-74 7.054 OF-83 3.188 OF-124 4.318 OF-75 0.669 OF-84 1.430 OF-125 1.519 OF-76 3.215 OF-92 2.452

Stream Name Sawmill Run Impairments Source Unknown – Siltation Sediment/Nutrients Loading Designation Sediment Number of MS4 Outfalls 43 Total Drainage Area 225.107 acres Structure ID Area (acres) Structure ID Area (acres) Structure ID Area (acres) OF-1 0.611 OF-188 1.611 OF-40 2.268 OF-10 3.516 OF-19 1.551 OF-5 1.997 OF-11 4.985 OF-20 31.539 OF-6 7.095 OF-113 6.831 OF-21 5.932 OF-7 10.199 OF-130 5.451 OF-22 1.241 OF-8 5.892

Page 1 of 2

OF-135 13.034 OF-23 3.575 OF-9 2.720 OF-14 16.465 OF-26 16.397 S-508 7.663 OF-15 11.380 OF-3 0.141 S-566 3.229 OF-163 0.477 OF-30 4.394 S-862 5.548 OF-164 2.375 OF-30.1 1.046 S-867 4.323 OF-169 4.140 OF-31 1.293 S-873 1.479 OF-17 5.453 OF-31.1 1.321 S-876 2.573 OF-170 5.322 OF-34 3.851 S-894 0.918 OF-171 6.035 OF-35 1.558 OF-18 1.215 OF-4 6.460

Stream Name Thompson Run Abandoned Mine Drainage – Metals ; Impairments Abandoned Mine Drainage – pH Sediment/Nutrients Loading Designation Sediment (Turtle Creek) Number of MS4 Outfalls 30 Total Drainage Area 214.184 acres Structure ID Area (acres) Structure ID Area (acres) Structure ID Area (acres) CB-47 4.395 OF-165 23.709 OF-47 5.059 OF-100 7.091 OF-166 17.658 OF-50 3.859 OF-101 4.046 OF-167 0.514 OF-54 8.271 OF-104 19.065 OF-168 2.148 OF-93 7.219 OF-104.1 2.136 OF-184 2.181 OF-94 3.006 OF-105 1.095 OF-185 2.487 OF-94.1 1.395 OF-108 1.118 OF-2 17.819 OF-94.2 0.357 OF-112 2.298 OF-37 1.557 OF-95 0.541 OF-144 2.251 OF-38 15.871 S-833 2.681 OF-158 5.066 OF-46 30.782 S-843 18.508

Stream Name Trib 37205 to Turtle Creek Impairments Channelization – Other Habitat Alterations Sediment/Nutrients Loading Designation Sediment (Turtle Creek) Number of MS4 Outfalls 3 Total Drainage Area 9.644 acres Structure ID Area (acres) Structure ID Area (acres) Structure ID Area (acres) OF-175 2.620 OF-175.1 2.542 S-249 4.482

Page 2 of 2

APPENDIX F

REQUIREMENTS MAP

6/22/2017 MS4 Requirements Pennsylvania DEP

MS4 Requirements Tom Wolf, Governor Patrick McDonnell, Secretary

MS4   Requirements

BACKGROUND

Municipalities and other entities such as universities and prisons that meet certain standards must obtain NPDES permit coverage for discharges of stormwater from their municipal separate storm sewer systems (MS4s).

A municipal separate storm sewer is any conveyance or system of conveyances (including but not limited to streets, ditches, and pipes) that is: owned by a municipality or other public body (created under state law) having jurisdiction over disposal of sewage, industrial wastes, stormwater or other wastes; designed or used for collecting or conveying stormwater; not a combined sewer (i.e., not intended for both sewage and stormwater); AND not part of a publicly owned treatment works (POTW).

Additional information regarding permitting requirements can be found at the Pennsylvania Municipal Stormwater Homepage.

Help is available by clicking the question mark icon in the header.

Select a County ALLEGHENY

Select a Municipality

http://www.depgis.state.pa.us/MS4/index.html 1/1

APPENDIX G

REQUIREMENTS TABLE

MS4 Name NPDES ID Individual Permit Reason Impaired Downstream Waters or Requirement(s) Other Cause(s) of Impairment Required? Applicable TMDL Name Allegheny County WEST VIEW BORO PAG136195 No Spruce Run Appendix E-Organic Enrichment/Low D.O., Siltation (5) Ohio River Appendix C-PCB (4a), Appendix B-Pathogens (5) Girtys Run Appendix E-Nutrients (5) Oil and Grease (5), Other Habitat Alterations (4c) Allegheny River Appendix C-PCB (4a), Appendix B-Pathogens (5) Unnamed Tributaries to Ohio River Appendix E-Organic Enrichment/Low D.O., Siltation (5) WHITAKER BORO PAG136278 No Homestead Run Appendix E-Siltation (5) Monongahela River Appendix C-PCB (4a), Appendix B-Pathogens (5) WHITE OAK BORO PAI136104 Yes SP, IP Long Run Appendix E-Siltation (5) Cause Unknown (5) Crooked Run Appendix E-Siltation (5) Monongahela River Appendix C-PCB (4a), Appendix B-Pathogens (5) WHITEHALL BORO PAG136222 Yes TMDL Plan Streets Run Appendix A-Metals (4a), Appendix E-Siltation (5) Sawmill Run Nutrients TMDL Plan-DO/BOD, Nutrients, Organic Enrichment/Low D.O., Siltation (4a) Sawmill Run AMD and Sediment TMDL Plan-Siltation (4a) Appendix A-Metals, pH (4a) Sawmill Run Appendix A-Metals (4a) Other Habitat Alterations, Water/Flow Variability (4c) Monongahela River Appendix C-PCB (4a), Appendix B-Pathogens (5) Ohio River Appendix C-PCB (4a), Appendix B-Pathogens (5) WILKINS TWP PAG136122 No Turtle Creek Appendix E-Siltation (5) Thompson Run Appendix A-Metals, pH (4a) Monongahela River Appendix C-PCB (4a), Appendix B-Pathogens (5) Sawmill Run Appendix E-Siltation (5) Chalfant Run Appendix E-Siltation (5) WILKINSBURG BORO PAG136197 No Chalfant Run Appendix E-Siltation (5) Monongahela River Appendix C-PCB (4a), Appendix B-Pathogens (5) Thompson Run Appendix A-Metals, pH (4a) Turtle Creek Appendix E-Siltation (5) WILMERDING BORO No Turtle Creek Appendix A-Metals, pH (4a), Appendix E-Siltation (5) Monongahela River Appendix C-PCB (4a), Appendix B-Pathogens (5)

Page 20 of 160 Revised 6/21/2017

APPENDIX H

POLLUTANT AGGREGATION SUGGESTIONS

MS4 Name Permit HUC 12 Name Impaired Downstream Waters or Applicable TMDL Requirement(s) Number Name Allegheny County WALL BORO PAG136243 Streets Run-Monongahela River Monongahela River Appendix B-Pathogens, Appendix C-PCB Sawmill Run-Turtle Creek Turtle Creek Appendix A-Metals, pH, Appendix E-Siltation WEST DEER TWP PAG136217 Chartiers Run-Allegheny River, Deer Creek Cunningham Run, Dawson Run, Deer Creek, Little Deer Creek, West Branch Appendix A-Metals, Appendix E-Nutrients, Siltation, Suspended Deer Creek Solids WEST ELIZABETH BORO PAG136324 Fallen Timber Run-Monongahela River Monongahela River Appendix C-PCB WEST HOMESTEAD BORO PAG136307 Streets Run-Monongahela River Monongahela River, Streets Run, West Run Appendix A-Metals, pH, Appendix B-Pathogens, Appendix C- PCB, Appendix E-Siltation Kilbuck Run-Ohio River Monongahela River Appendix B-Pathogens, Appendix C-PCB WEST MIFFLIN BORO PAG136166 Piney Fork-Peters Creek, Streets Run-Monongahela River Lewis Run, Monongahela River, Peters Creek Appendix B-Pathogens Fallen Timber Run-Monongahela River, Streets Run-Monongahela River Homestead Run, Monongahela River, Streets Run, Thompson Run, Unnamed Appendix A-Metals, Appendix C-PCB, Appendix E-Organic Tributaries to Monongahela River Enrichment/Low D.O., Siltation WEST VIEW BORO PAG136195 Kilbuck Run-Ohio River, McCabe Run-Ohio River Allegheny River, Ohio River Appendix B-Pathogens, Appendix C-PCB Kilbuck Run-Ohio River, Lowries Run Spruce Run, Unnamed Tributaries to Ohio River Appendix E-Nutrients, Organic Enrichment/Low D.O., Siltation Allegheny River-Ohio River Allegheny River Appendix B-Pathogens, Appendix C-PCB Girtys Run Girtys Run Appendix E-Nutrients, Organic Enrichment/Low D.O., Siltation WHITAKER BORO PAG136278 Streets Run-Monongahela River Homestead Run, Monongahela River Appendix B-Pathogens, Appendix C-PCB, Appendix E-Siltation WHITE OAK BORO PAI136104 Streets Run-Monongahela River Crooked Run, Monongahela River Appendix B-Pathogens, Appendix C-PCB, Appendix E-Siltation Long Run, Pollack Run-Youghiogheny River Long Run Appendix E-Siltation WHITEHALL BORO PAG136222 Kilbuck Run-Ohio River Monongahela River, Ohio River Appendix B-Pathogens, Appendix C-PCB Streets Run-Monongahela River Monongahela River, Streets Run Appendix A-Metals, pH, Appendix B-Pathogens, Appendix C- PCB, Appendix E-Siltation Kilbuck Run-Ohio River, Sawmill Run Sawmill Run AMD and Sediment, Sawmill Run Nutrients Appendix A-Metals, pH, TMDL Plan-DO/BOD, Nutrients, Organic Enrichment/Low D.O., Siltation WILKINS TWP PAG136122 Sawmill Run-Turtle Creek, Thompson Run Chalfant Run, Sawmill Run, Thompson Run, Turtle Creek Appendix A-Metals, pH, Appendix E-Siltation Streets Run-Monongahela River Monongahela River Appendix B-Pathogens, Appendix C-PCB WILKINSBURG BORO PAG136197 Sawmill Run-Turtle Creek, Thompson Run Chalfant Run, Thompson Run, Turtle Creek Appendix A-Metals, pH, Appendix E-Siltation Streets Run-Monongahela River Monongahela River Appendix B-Pathogens, Appendix C-PCB WILMERDING BORO Streets Run-Monongahela River Monongahela River Appendix B-Pathogens, Appendix C-PCB Sawmill Run-Turtle Creek Turtle Creek Appendix A-Metals, pH, Appendix E-Siltation

Page 14 of 107 Revised 6/21/2017

APPENDIX I

LOADING RATES FOR PA COUNTIES

3800-PM-BCW0100k 3/2017 PRP Instructions

ATTACHMENT B

DEVELOPED LAND LOADING RATES FOR PA COUNTIES1,2,3

TN TP TSS (Sediment) County Category Acres lbs/acre/yr lbs/acre/yr lbs/acre/yr impervious developed 10,373.2 33.43 2.1 1,398.77 Adams pervious developed 44,028.6 22.99 0.8 207.67 impervious developed 9,815.2 19.42 1.9 2,034.34 Bedford pervious developed 19,425 17.97 0.68 301.22 impervious developed 1,292.4 36.81 2.26 1,925.79 Berks pervious developed 5,178.8 34.02 0.98 264.29 impervious developed 3,587.9 20.88 1.73 1,813.55 Blair pervious developed 9,177.5 18.9 0.62 267.34 impervious developed 10,423 14.82 2.37 1,880.87 Bradford pervious developed 23,709.7 13.05 0.85 272.25 impervious developed 3,237.9 20.91 2.9 2,155.29 Cambria pervious developed 8,455.4 19.86 1.12 325.3 impervious developed 1,743.2 18.46 2.98 2,574.49 Cameron pervious developed 1,334.5 19.41 1.21 379.36 impervious developed 25.1 28.61 3.97 2,177.04 Carbon pervious developed 54.2 30.37 2.04 323.36 impervious developed 7,828.2 19.21 2.32 1,771.63 Centre pervious developed 15,037.1 18.52 0.61 215.84 impervious developed 1,838.4 21.15 1.46 1,504.78 Chester pervious developed 10,439.8 14.09 0.36 185.12 impervious developed 9,638.5 17.54 2.78 1,902.9 Clearfield pervious developed 17,444.3 18.89 1.05 266.62 impervious developed 7,238.5 18.02 2.80 1,856.91 Clinton pervious developed 11,153.8 16.88 0.92 275.81 impervious developed 7,343.1 21.21 3.08 1,929.18 Columbia pervious developed 21,848.2 22.15 1.22 280.39 impervious developed 8,774.8 28.93 1.11 2,065.1 Cumberland pervious developed 26,908.6 23.29 0.34 306.95 impervious developed 3,482.4 28.59 1.07 1,999.14 Dauphin pervious developed 9,405.8 21.24 0.34 299.62 impervious developed 1,317.7 18.91 2.91 1,556.93 Elks pervious developed 1,250.1 19.32 1.19 239.85 impervious developed 13,832.3 31.6 2.72 1,944.85 Franklin pervious developed 49,908.6 24.37 0.76 308.31 impervious developed 3,712.9 22.28 2.41 1,586.75 Fulton pervious developed 4,462.3 18.75 0.91 236.54 impervious developed 7,321.9 18.58 1.63 1,647.53 Huntington pervious developed 11,375.4 17.8 0.61 260.15 impervious developed 589 19.29 2.79 1,621.25 Indiana pervious developed 972 20.1 1.16 220.68 impervious developed 21.4 18.07 2.76 1,369.63 Jefferson pervious developed 20.4 19.96 1.24 198.60 impervious developed 3,770.2 22.58 1.69 1,903.96 Juniata pervious developed 8,928.3 17.84 0.55 260.68 impervious developed 2,969.7 19.89 2.84 1,305.05 Lackawana pervious developed 7,783.9 17.51 0.76 132.98 impervious developed 4,918.7 38.53 1.55 1,480.43 Lancaster pervious developed 21,649.7 22.24 0.36 190.93 impervious developed 1,192.1 40.58 1.85 1,948.53 Lebanon pervious developed 5,150 27.11 0.4 269.81 impervious developed 5,857 20.43 3 1,648.22 Luzerne pervious developed 13,482.9 19.46 0.98 221.19 impervious developed 10,031.7 16.48 2.57 1,989.64 Lycoming pervious developed 19,995.5 16 0.84 277.38

- 11 - 3800-PM-BCW0100k 3/2017 PRP Instructions

TN TP TSS (Sediment) County Category Acres lbs/acre/yr lbs/acre/yr lbs/acre/yr impervious developed 38.7 20.93 3.21 1,843.27 McKean pervious developed 5.3 22.58 1.45 249.26 impervious developed 5,560.2 21.83 1.79 1,979.13 Mifflin pervious developed 16,405.5 21.13 0.71 296.07 impervious developed 5,560.2 21.83 1.79 1,979.13 Montour pervious developed 16,405.5 21.13 0.71 296.07 impervious developed 8,687.3 25.73 1.54 2,197.08 Northumberland pervious developed 25,168.3 24.63 0.54 367.84 impervious developed 5,041.1 26.77 1.32 2,314.7 Perry pervious developed 9,977 23.94 0.51 343.16 impervious developed 2,936.3 16.95 2.75 1,728.34 Potter pervious developed 2,699.3 17.11 1.09 265.2 impervious developed 5,638.7 30.49 1.56 1,921.08 Schuylkill pervious developed 14,797.2 29.41 0.57 264.04 impervious developed 4,934.2 28.6 1.11 2,068.16 Snyder pervious developed 14,718.1 24.35 0.4 301.5 impervious developed 1,013.6 25.13 2.79 1,845.7 Somerset pervious developed 851.2 25.71 1.14 293.42 impervious developed 3,031.7 19.08 2.85 2,013.9 Sullivan pervious developed 3,943.4 21.55 1.31 301.58 impervious developed 7,042.1 19.29 2.86 1,405.73 Susquehanna pervious developed 14,749.7 20.77 1.21 203.85 impervious developed 7,966.9 12.37 2.09 1,767.75 Tioga pervious developed 18,090.3 12.22 0.76 261.94 impervious developed 4,382.6 22.98 2.04 2,393.55 Union pervious developed 14,065.3 20.88 0.69 343.81 impervious developed 320.5 18.69 2.89 1,002.58 Wayne pervious developed 509 21.14 1.31 158.48 impervious developed 3,634.4 16.03 2.53 2,022.32 Wyoming pervious developed 10,792.9 13.75 0.7 238.26 impervious developed 10,330.7 29.69 1.18 1,614.15 York pervious developed 40,374.8 18.73 0.29 220.4 All Other impervious developed - 23.06 2.28 1,839 Counties pervious developed - 20.72 0.84 264.96

Notes:

1 These land loading rate values may be used to d PRP development. MS4s may choose to develop estimates using other scientifically sound methods.

2 Acres and land loading rate values for named counties in the Chesapeake Bay watershed are derived from CAST. (The column for Acres represents acres within the Chesapeake Bay watershed). For MS4s located outside of the Chesapeake E; these values are average values across the Chesapeake Bay watershed.

3 For land area outside of the urbanized area, undeveloped land loading rates may be used where appropriate. When using the simplified method, DEP recommends the following loading rates (for any county) for undeveloped land:

TN 10 lbs/acre/yr TP 0.33 lbs/acre/yr TSS (Sediment) 234.6 lbs/acre/yr

These values were derived by using the existing loads for each pollutant, according to the 2014 Chesapeake Bay Progress Run, and dividing by the number of acres for the unregulated stormwater subsector.

- 12 -

APPENDIX J

STATEWIDE MS4 LAND COVER ESTIMATES

Statewide MS4 Land Cover Estimates

Outside of Outside of UA % UA % UA % UA % UA County Municipality Impervious Pervious Impervious Pervious Acres Lebanon WEST LEBANON TWP 12% 88% 10% 90% 411.3 WEST LEECHBURG Westmoreland BORO 44% 56% 44% 56% 253.3 WEST MANCHESTER York TWP 28% 72% 25% 75% 10,675.8 York WEST MANHEIM TWP 16% 84% 5% 95% 2,283.8 Beaver WEST MAYFIELD BORO 29% 71% 29% 71% 511.1 WEST MIDDLESEX Mercer BORO 35% 65% 33% 67% 494.2 Allegheny WEST MIFFLIN BORO 32% 68% 33% 67% 9,351.3 Cambria WESTMONT BORO 38% 62% 38% 62% 1,492.0 Westmoreland WEST NEWTON BORO 29% 71% 29% 71% 711.0 Montgomery WEST NORRITON TWP 40% 60% 40% 60% 3,929.8 WEST NOTTINGHAM Chester TWP 16% 84% 5% 95% 1,380.5 Chester WEST PIKELAND TWP 21% 79% 12% 88% 1,874.2 Luzerne WEST PITTSTON BORO 64% 36% 63% 37% 598.5 WEST POTTSGROVE Montgomery TWP 31% 69% 31% 69% 1,493.7 Berks WEST READING BORO 73% 27% 73% 27% 380.3 Bucks WEST ROCKHILL TWP 23% 77% 9% 91% 1,973.1 Chester WEST SADSBURY TWP 10% 90% 8% 92% 860.6 Cambria WEST TAYLOR TWP 24% 76% 5% 95% 269.2 Chester WESTTOWN TWP 30% 70% 30% 70% 5,579.7 Allegheny WEST VIEW BORO 57% 43% 57% 43% 641.4 Chester WEST VINCENT TWP 11% 89% 6% 94% 2,804.1 Chester WEST WHITELAND TWP 32% 68% 32% 68% 8,294.2 Luzerne WEST WYOMING BORO 33% 67% 13% 87% 693.2 York WEST YORK BORO 68% 32% 68% 32% 327.3 Mercer WHEATLAND BORO 49% 51% 49% 51% 554.8 Allegheny WHITAKER BORO 59% 41% 60% 40% 213.6 Beaver WHITE TWP 25% 75% 25% 75% 445.4 Allegheny WHITEHALL BORO 41% 59% 41% 59% 2,119.2 Lehigh WHITEHALL TWP 32% 68% 32% 68% 8,156.3 Montgomery WHITEMARSH TWP 24% 76% 24% 76% 9,425.7 Allegheny WHITE OAK BORO 18% 82% 18% 82% 4,249.5 Montgomery WHITPAIN TWP 41% 59% 41% 59% 8,230.0 Luzerne WILKES-BARRE CITY 60% 40% 60% 40% 4,631.0 Luzerne WILKES-BARRE TWP 52% 48% 52% 48% 1,877.9 Allegheny WILKINS TWP 31% 69% 31% 69% 1,709.7 Allegheny WILKINSBURG BORO 39% 61% 39% 61% 1,455.1 Northampton WILLIAMS TWP 17% 83% 7% 93% 1,825.9 Lycoming WILLIAMSPORT CITY 52% 48% 50% 50% 5,886.2 Chester WILLISTOWN TWP 30% 70% 15% 85% 4,023.5 Allegheny WILMERDING BORO 53% 47% 54% 46% 275.6 Northampton WILSON BORO 65% 35% 65% 35% 742.2 Somerset WINDBER BORO 34% 66% 34% 66% 1,230.1 Northampton WIND GAP BORO 36% 64% 37% 63% 869.1 Berks WINDSOR TWP 24% 76% 3% 97% 371.0 York WINDSOR BORO 28% 72% 28% 72% 372.0 York WINDSOR TWP 15% 85% 11% 89% 10,809.6 Butler WINFIELD TWP 7% 93% 2% 98% 551.6 Berks WOMELSDORF BORO 41% 59% 39% 61% 550.9 Lycoming WOODWARD TWP 12% 88% 5% 95% 682.4 Montgomery WORCESTER TWP 22% 78% 17% 83% 4,954.8

APPENDIX K

BMP EFFECTIVENESS VALUES

3800-PM-BCW0100m 5/2016 COMMONWEALTH OF PENNSYLVANIA BMP Effectiveness Values DEPARTMENT OF ENVIRONMENTAL PROTECTION BUREAU OF CLEAN WATER

NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) STORMWATER DISCHARGES FROM SMALL MUNICIPAL SEPARATE STORM SEWER SYSTEMS BMP EFFECTIVENESS VALUES

This table of BMP effectiveness values (i.e., pollutant removal efficiencies) is intended for use by MS4s that are developing and implementing Pollutant Reduction Plans and TMDL Plans to comply with NPDES permit requirements. The values used in this table generally consider pollutant reductions from both overland flow and reduced downstream erosion, and are based primarily on average values within the Chesapeake Assessment Scenario Tool (CAST) (www.casttool.org). Design considerations, operation and maintenance, and construction sequences should be as outlined in the Pennsylvania Stormwater BMP Manual, Chesapeake Bay Program guidance, or other technical sources. The Department of Environmental Protection (DEP) will update the information contained in this table as new information becomes available. Interested parties may submit information to DEP for consideration in updating this table to DEP’s MS4 resource account, [email protected]. Where an MS4 proposes a BMP not identified in this document or in Chesapeake Bay Program expert panel reports, other technical resources may be consulted for BMP effectiveness values. Note – TN = Total Nitrogen and TP = Total Phosphorus.

BMP Effectiveness Values BMP Name BMP Description TN TP Sediment A water impoundment structure that intercepts stormwater runoff then releases it to an open water system at a specified flow rate. These structures retain a permanent pool and usually have retention times sufficient to allow settlement of some portion of the intercepted sediments and attached nutrients/toxics. Until Wet Ponds and Wetlands 20% 45% 60% recently, these practices were designed specifically to meet water quantity, not water quality objectives. There is little or no vegetation living within the pooled area nor are outfalls directed through vegetated areas prior to open water release. Nitrogen reduction is minimal. Dry Detention Ponds are depressions or basins created by excavation or berm construction that temporarily store runoff and release it slowly via surface flow or groundwater infiltration following storms. Hydrodynamic Structures are devices Dry Detention Basins and 5% 10% 10% designed to improve quality of stormwater using features such as swirl Hydrodynamic Structures concentrators, grit chambers, oil barriers, baffles, micropools, and absorbent pads that are designed to remove sediments, nutrients, metals, organic chemicals, or oil and grease from urban runoff. Dry extended detention (ED) basins are depressions created by excavation or berm construction that temporarily store runoff and release it slowly via surface flow or groundwater infiltration following storms. Dry ED basins are designed to dry out Dry Extended Detention 20% 20% 60% between storm events, in contrast with wet ponds, which contain standing water Basins permanently. As such, they are similar in construction and function to dry detention basins, except that the duration of detention of stormwater is designed to be longer, theoretically improving treatment effectiveness.

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BMP Effectiveness Values BMP Name BMP Description TN TP Sediment A depression to form an infiltration basin where sediment is trapped and water infiltrates the soil. No underdrains are associated with infiltration basins and trenches, because by definition these systems provide complete infiltration. Design Infiltration Practices w/ specifications require infiltration basins and trenches to be built in good soil, they 85% 85% 95% Sand, Veg. are not constructed on poor soils, such as C and D soil types. Engineers are required to test the soil before approval to build is issued. To receive credit over the longer term, jurisdictions must conduct yearly inspections to determine if the basin or trench is still infiltrating runoff. Practices that capture and temporarily store runoff and pass it through a filter bed of either sand or an organic media. There are various sand filter designs, such as above ground, below ground, perimeter, etc. An organic media filter uses another Filtering Practices 40% 60% 80% medium besides sand to enhance pollutant removal for many compounds due to the increased cation exchange capacity achieved by increasing the organic matter. These systems require yearly inspection and maintenance to receive pollutant reduction credit. Urban filter strips are stable areas with vegetated cover on flat or gently sloping land. Runoff entering the filter strip must be in the form of sheet-flow and must Filter Strip Runoff Reduction 20% 54% 56% enter at a non-erosive rate for the site-specific soil conditions. A 0.4 design ratio of filter strip length to impervious flow length is recommended for runoff reduction urban filter strips. Urban filter strips are stable areas with vegetated cover on flat or gently sloping land. Runoff entering the filter strip must be in the form of sheet-flow and must Filter Strip Stormwater 0% 0% 22% enter at a non-erosive rate for the site-specific soil conditions. A 0.2 design ratio of Treatment filter strip length to impervious flow length is recommended for stormwater treatment urban filter strips. An excavated pit backfilled with engineered media, topsoil, mulch, and vegetation. These are planting areas installed in shallow basins in which the storm water runoff Bioretention – Raingarden 25% 45% 55% is temporarily ponded and then treated by filtering through the bed components, (C/D soils w/ underdrain) and through biological and biochemical reactions within the soil matrix and around the root zones of the plants. This BMP has an underdrain and is in C or D soil. An excavated pit backfilled with engineered media, topsoil, mulch, and vegetation. These are planting areas installed in shallow basins in which the storm water runoff Bioretention / Raingarden 70% 75% 80% is temporarily ponded and then treated by filtering through the bed components, (A/B soils w/ underdrain) and through biological and biochemical reactions within the soil matrix and around the root zones of the plants. This BMP has an underdrain and is in A or B soil.

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BMP Effectiveness Values BMP Name BMP Description TN TP Sediment An excavated pit backfilled with engineered media, topsoil, mulch, and vegetation. Bioretention / Raingarden These are planting areas installed in shallow basins in which the storm water runoff 80% 85% 90% is temporarily ponded and then treated by filtering through the bed components, (A/B soils w/o underdrain) and through biological and biochemical reactions within the soil matrix and around the root zones of the plants. This BMP has no underdrain and is in A or B soil. Open channels are practices that convey stormwater runoff and provide treatment Vegetated Open Channels as the water is conveyed, includes bioswales. Runoff passes through either 10% 10% 50% (C/D Soils) vegetation in the channel, subsoil matrix, and/or is infiltrated into the underlying soils. This BMP has no underdrain and is in C or D soil. Open channels are practices that convey stormwater runoff and provide treatment Vegetated Open Channels as the water is conveyed, includes bioswales. Runoff passes through either 45% 45% 70% (A/B Soils) vegetation in the channel, subsoil matrix, and/or is infiltrated into the underlying soils. This BMP has no underdrain and is in A or B soil. With a bioswale, the load is reduced because, unlike other open channel designs, Bioswale 70% 75% 80% there is now treatment through the soil. A bioswale is designed to function as a bioretention area. Pavement or pavers that reduce runoff volume and treat water quality through both Permeable Pavement w/o infiltration and filtration mechanisms. Water filters through open voids in the Sand or Veg. 10% 20% 55% pavement surface to a washed gravel subsurface storage reservoir, where it is then (C/D Soils w/ underdrain) slowly infiltrated into the underlying soils or exits via an underdrain. This BMP has an underdrain, no sand or vegetation and is in C or D soil. Pavement or pavers that reduce runoff volume and treat water quality through both Permeable Pavement w/o infiltration and filtration mechanisms. Water filters through open voids in the Sand or Veg. 45% 50% 70% pavement surface to a washed gravel subsurface storage reservoir, where it is then (A/B Soils w/ underdrain) slowly infiltrated into the underlying soils or exits via an underdrain. This BMP has an underdrain, no sand or vegetation and is in A or B soil. Pavement or pavers that reduce runoff volume and treat water quality through both Permeable Pavement w/o infiltration and filtration mechanisms. Water filters through open voids in the Sand or Veg. 75% 80% 85% pavement surface to a washed gravel subsurface storage reservoir, where it is then (A/B Soils w/o underdrain) slowly infiltrated into the underlying soils or exits via an underdrain. This BMP has no underdrain, no sand or vegetation and is in A or B soil. Pavement or pavers that reduce runoff volume and treat water quality through both Permeable Pavement w/ infiltration and filtration mechanisms. Water filters through open voids in the Sand or Veg. 50% 50% 70% pavement surface to a washed gravel subsurface storage reservoir, where it is then (A/B Soils w/ underdrain) slowly infiltrated into the underlying soils or exits via an underdrain. This BMP has an underdrain, has sand and/or vegetation and is in A or B soil.

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BMP Effectiveness Values BMP Name BMP Description TN TP Sediment Pavement or pavers that reduce runoff volume and treat water quality through both Permeable Pavement w/ infiltration and filtration mechanisms. Water filters through open voids in the Sand or Veg. 80% 80% 85% pavement surface to a washed gravel subsurface storage reservoir, where it is then (A/B Soils w/o underdrain) slowly infiltrated into the underlying soils or exits via an underdrain. This BMP has no underdrain, has sand and/or vegetation and is in A or B soil. Pavement or pavers that reduce runoff volume and treat water quality through both Permeable Pavement w/ infiltration and filtration mechanisms. Water filters through open voids in the Sand or Veg. 20% 20% 55% pavement surface to a washed gravel subsurface storage reservoir, where it is then (C/D Soils w/ underdrain) slowly infiltrated into the underlying soils or exits via an underdrain. This BMP has an underdrain, has sand and/or vegetation and is in C or D soil. An annual mass nutrient and sediment reduction credit for qualifying stream 0.075 0.068 44.88 restoration practices that prevent channel or bank erosion that otherwise would be Stream Restoration delivered downstream from an actively enlarging or incising urban stream. Applies lbs/ft/yr lbs/ft/yr lbs/ft/yr to 0 to 3rd order streams that are not tidally influenced. If one of the protocols is cited and pounds are reported, then the mass reduction is received for the protocol. An area of trees at least 35 feet wide on one side of a stream, usually accompanied by trees, shrubs and other vegetation that is adjacent to a body of water. The riparian area is managed to maintain the integrity of stream channels Forest Buffers 25% 50% 50% and shorelines, to reduce the impacts of upland sources of pollution by trapping, filtering, and converting sediments, nutrients, and other chemicals. (Note – the values represent pollutant load reductions from stormwater draining through buffers). The BMP effectiveness values for tree planting are estimated by DEP. DEP estimates that 100 fully mature trees of mixed species (both deciduous and non- deciduous) provide pollutant load reductions for the equivalent of one acre (i.e., one mature tree = 0.01 acre). The BMP effectiveness values given are based on immature trees (seedlings or saplings); the effectiveness values are expected to Tree Planting 10% 15% 20% increase as the trees mature. To determine the amount of pollutant load reduction that can credited for tree planting efforts: 1) multiply the number of trees planted by 0.01; 2) multiply the acreage determined in step 1 by the pollutant loading rate for the land prior to planting the trees (in lbs/acre/year); and 3) multiply the result of step 2 by the BMP effectiveness values given. Street sweeping must be conducted 25 times annually. Only count those streets that have been swept at least 25 times in a year. The acres associated with all Street Sweeping 3% 3% 9% streets that have been swept at least 25 times in a year would be eligible for pollutant reductions consistent with the given BMP effectiveness values.

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BMP Effectiveness Values BMP Name BMP Description TN TP Sediment This BMP (also referred to as “Storm Drain Cleaning”) involves the collection or capture and proper disposal of solid material within the storm system to prevent discharge to surface waters. Examples include catch basins, stormwater inlet filter bags, end of pipe or outlet solids removal systems and related practices. Credit is authorized for this BMP only when proper maintenance practices are observed (i.e., inspection and removal of solids as recommended by the system manufacturer or other available guidelines). The entity using this BMP for pollutant removal credits must demonstrate that they have developed and are implementing a standard operating procedure for tracking the material removed from the sewer system. Locating such BMPs should consider the potential for backups onto roadways or other areas that can produce safety hazards.

To determine pollutant reductions for this BMP, these steps must be taken:

1) Measure the weight of solid/organic material collected (lbs). Sum the total 0.0027 for 0.0006 for weight of material collected for an annual period. Note – do not include sediment, sediment, refuse, debris and floatables in the determination of total mass collected. Storm Sewer System Solids 1 – TN and TP Removal 0.0111 for 0.0012 for concentrations organic organic 2) Convert the annual wet weight captured into annual dry weight (lbs) by using matter matter site-specific measurements (i.e., dry a sample of the wet material to find its weight) or by using default factors of 0.7 (material that is predominantly wet sediment) or 0.2 (material that is predominantly wet organic matter, e.g., leaf litter).

3) Multiply the annual dry weight of material collected by default or site-specific pollutant concentration factors. The default concentrations are shown in the BMP Effectiveness Values columns. Alternatively, the material may be sampled (at least annually) to determine site-specific pollutant concentrations.

DEP will allow up to 50% of total pollutant reduction requirements to be met through this BMP. The drainage area treated by this BMP may be no greater than 0.5 acre unless it can be demonstrated that the specific system proposed is capable of treating stormwater from larger drainage areas. For planning purposes, the sediment removal efficiency specified by the manufacturer may be assumed, but no higher than 80%.

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APPENDIX L

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APPENDIX M

BMP ESTIMATED COSTS

BMP Estimated Costs

Street Sweeping

Estimated Initial Cost and Estimated O&M Cost was determined by the number of miles of municipal roadways from the PennDOT Type 5 Map and by the values given in the Pennsylvania Stormwater BMP Manual Section 5.9.1 (assumed vacuum sweeper).

Estimated Initial Cost = $150,000

Estimated O&M Cost = ($15/curb-mile)(50 curb-miles)(25/year) = $18,750/year

Vegetated Open Channels (C/D Soils)

Estimated Initial Cost and Estimated O&M Cost was determined by measuring the linear feet of vegetated channel and by the values given in the Pennsylvania Stormwater BMP Manual Section 6.4.8 (assumed more expensive sod swale due to turf reinforcement matting).

Estimated Initial Cost = ($20/ft)(1,500 ft) = $30,000

Estimated O&M Cost = ($0.75/ft/year)(1,500 ft) = $1,125/year

Stream Restoration

Estimated Initial Cost and Estimated O&M Cost was determined by measuring the linear feet of stream restoration and by the values given in the Pennsylvania Stormwater BMP Manual Section 6.7.4 (assumed value from Keystone Stream Team Website).

Estimated Initial Cost = ($200/ft)(100 ft) = $20,000

Estimated O&M Cost = Negligible

Wet Ponds and Wetlands

Estimated Initial Cost and Estimated O&M Cost was determined by measuring the area of wet pond/wetland and by the values given in the Pennsylvania Stormwater BMP Manual Section 6.6.1 and 6.6.2 (assumed less expensive acreage/O&M cost due to minimal construction/O&M needs).

Estimated Initial Cost = ($30,000/acre)(0.25 acres) = $7,500

Estimated O&M Cost = (0.02/year)($7,500) = $150/year

Infiltration Practices w/ Sand, Veg.

Estimated Initial Cost and Estimated O&M Cost was determined by measuring the linear feet of infiltration trench and by the values given in the Pennsylvania Stormwater BMP Manual Section 6.4.4 (assumed less expensive costs due to existing conditions and assumed 2’x2’ cross section).

Estimated Initial Cost = ($4/cf)(4 sf)(2775 ft + 1675 ft) = $71,200

Estimated O&M Cost = (0.05/year)($71,200) = $3,560/year

APPENDIX N

FUNDING OPPORTUNITIES

Funding Opportunities

The Township will be investigating a number of funding opportunities and mechanisms to assist with the implementation of the activities required in this PRP. These will include, but not be limited, to the following:

Stormwater Fee

A stormwater fee is charged to property owners on a monthly basis based on the amount of impervious surface on a property (rooftops, parking lots, driveways, etc.). Impervious areas do not allow rainfall to penetrate into the ground, but instead cause it to run off into streams and rivers. Implementing such a stormwater fee would help fund local stormwater management programs, which would control stormwater runoff through construction, operation, and maintenance of a stormwater system. Currently, the Commonwealth of Pennsylvania does not allow Townships such as Wilkins to implement this type of fee, although legislation is under consideration to provide the legal means to do so. The Township will monitor the progress of this legislation and consider the development and implementation of a stormwater fee wen appropriate.

BMP Construction – PENNVEST

The Pennsylvania Infrastructure Investment Authority (PENNVEST) provides construction and related funding/financing for Best Management Practices (BMPs) for the following categories:

 Urban Stormwater BMPs  Agricultural BMPs  Abandoned Mine Drainage BMPs  Brownfields BMPs

Funding/financing terms vary depending on the affordability of the project to the applicant. The Township will evaluate the BMPs and other projects that will be implemented under their MS4 Permit for applicability to the PENNVEST programs.

Growing Greener Grants

Growing Greener is an investment of state funds to address Pennsylvania's critical environmental concerns. DEP is authorized to allocate these funds in grants for:

 Watershed restoration and protection  Abandoned mine reclamation  Abandoned oil and gas well plugging projects

The availability of funding varies with the allocations made by the Commonwealth. The Township will evaluate the BMPs and other projects that will be implemented under their MS4 Permit for applicability to the grant programs.

APPENDIX O

BMP O&M ACTIVITY FREQUENCY

BMP O&M Activity and Frequency

Street Sweeping

A. Street sweeping machinery should be operated and maintained per the manufacture’s guide. B. Street signs for street sweeping and parking enforcement will need to be maintained during the street sweeping months. C. Disposal of waste from street sweeping will need to be properly stored and/or disposed of at an appropriate facility.

Vegetated Open Channels (C/D Soils)

A. Maintenance activities to be done annually and within 48 hours after every major storm event (>1 inch rainfall depth): a. Inspect and correct erosion problems, damage to vegetation, and sediment and debris accumulation (address when > 3 inches at any spot or covering vegetation) b. Inspect vegetation on side slopes for erosion and formation of rills or gullies, correct as needed c. Inspect for pools of standing water; dewater and discharge to an approved location and restore to design grade d. Mow and trim vegetation to ensure safety, aesthetics, proper swale operation, or to suppress weeds and invasive vegetation; dispose of cuttings in a local composting facility; mow only when swale is dry to avoid rutting e. Inspect for litter; remove prior to mowing f. Inspect for uniformity in cross-section and longitudinal slope, correct as needed g. Inspect swale inlet (curb cuts, pipes, etc.) and outlet for signs of erosion or blockage, correct as needed B. Maintenance activities to be done as needed: a. Plant alternative grass species in the event of unsuccessful establishment b. Reseed bare areas; install appropriate erosion control measures when native soil is exposed or erosion channels are forming c. Rototill and replant swale if draw down time is more than 48 hours d. Inspect and correct check dams when signs of altered water flow (channelization, obstructions, erosion, etc.) are identified e. Water during dry periods, fertilize, and apply pesticide only when absolutely necessary C. Winter conditions also necessitate additional maintenance concerns, which include the following: a. Inspect swale immediately after the spring melt, remove residuals (e.g. sand) and replace damaged vegetation without disturbing remaining vegetation b. If roadside or parking lot runoff is directed to the swale, mulching and/or soil aeration/manipulation may be required in the spring to restore soil structure and moisture capacity and to reduce the impacts of deicing agents. c. Use nontoxic, organic deicing agents, applied either as blended, magnesium chloride- based liquid products or as pretreated salt. d. Use salt-tolerant vegetation in swales.

Stream Restoration

A. Vegetation established along the streambanks should maintain a minimal 85 percent survival rate. B. Weeds and invasive plants limit buffer growth and survival of native plants; therefore, weeds and invasive plants should be controlled by either herbicides, mowing, or weed mats. These techniques

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may need to be implemented after the first growing season and may need to continue into the fourth year after the implementation of the stream restoration. C. Proper care should be taken to ensure that proximity to water features is considered. D. Mowing controls the height of the existing grasses yet increases nutrient uptake; therefore, competition for nutrients will persist until the canopy closure shades out lower layers. Mowing could occur twice each growing season. Mower height should be set between eight and 12 inches. E. Weed mats are geo-textile fabrics that are used to suppress weed growth around newly planted vegetation by providing shade and preventing seed deposition. Weed mats are installed after planting, and should be removed once the trees have developed a canopy that will naturally shade out weeds. F. Once established, the stream restoration project should require little to no long-term maintenance.

Wet Ponds and Wetlands

A. During the first growing season, vegetation should be inspected every 2 to 3 weeks. B. During the first 2 years, the BMP should be inspected at least 4 times per year and after major storms (greater than 2 inches in 24 hours). Inspections should access the vegetation, erosion, flow channelization, bank stability, inlet/outlet conditions, and sediment/debris accumulation. Problems should be corrected as soon as possible. C. Wetland and buffer vegetation may require support – watering, weeding, mulching, replanting, etc. – during the first 3 years. D. Undesirable species should be removed and desirable replacements planted if necessary. E. Once established, BMP should be inspected at least semiannually and after major storms as well as rapid ice breakup. F. Vegetation should maintain at least an 85 percent cover of the emergent vegetation zone. G. Annual harvesting of vegetation may increase the nutrient removal of the BMP; it should generally be done in the summer so that there is adequate regrowth before winter. Care should be taken to minimize disturbance, especially of bottom sediments, during harvesting. The potential disturbance from harvesting may outweigh its benefits unless the BMP receives a particularly high nutrient load or discharges to a nutrient sensitive waterbody. H. Sediment should be removed from the BMP before it occupies 50 percent of the BMP height, typically every 3 to 7 years.

Infiltration Practices w/ Sand, Veg.

A. The vegetation along the surface of the infiltration trench should be maintained in good condition, and any bare spots revegetated as soon as possible. B. Vehicles should not be parked or driven on a vegetated infiltration trench, and care should be taken to avoid excessive compaction by mowers. C. If ponding water occurs for more than 72 hours after a runoff event, the infiltration trench may need to be re-installed.

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