NPDES - PCSM. National Pollutant Discharge Elimination System Post Construction Stormwater Management Permit Preparation

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1 NPDES - PCSM National Pollutant Discharge Elimination System Post Construction Stormwater Management Permit Preparation Jim Pillsbury PE, Kathy Hamilton RLA Engineer s Workshop March 19-20, 2015 WCD 2015

2 Who needs NPDES? ANY earth disturbance on 1 acre or more General Permit for WWF, TSF, CWF Individual Permit for HQ, EV, or Act 2 WCD 2015

3 NPDES Permit Components 01/2015 E&S Control Plan PCSM Thermal Impact Analysis Critical Stages Antidegradation Analysis (Individual NPDES) Completeness review Checklist Worksheets 1 5, 10 (General NPDES) Worksheets 1 13 (Individual NPDES) WCD 2015

4 PCSM Post Construction Stormwater Management: IS Stormwater Management with an emphasis on the 2 year storm WCD 2015

5

6

7

8 Pre-Development: illustrates the NATURAL hydrologic cycle

9 Post Development: illustrates the IMPAIRED hydrologic cycle

10 PCSM Plan Goals Maximize infiltration of ground water Protect structural integrity of streams Protect/maintain designated uses / classifications of streams (WWF-HQ) WCD 2015

11 Important PCSM Plan Location Map on USGS Quadrangle Inclusions: Receiving Water / Watershed Name and Chapter 93 Receiving Water Classification Municipal Storm Sewer or Private Storm Sewer Operator WCD 2015

12 PCSM Plan NPDES Form Worksheets Narrative and calculations Drawings WCD 2015

13 NPDES Section C Waters of the Commonwealth MS4 s 6 Minimum Control Measures Municipal Responsibilities TMDL s Impairment Waste Load Allocation WCD 2015

14 NPDES Section D E&S and PCSM Plan 1-2. E&S Plan and PCSM Plan information 3. Summary Table for Supporting Calculation and Measurement Data 4. Summary Description of PCSM BMPs 5. Off Site Discharge Analysis 6. Potential Pollution Causing Materials 7. Riparian Buffers 8. Thermal Impacts Analysis 9. Critical Stages WCD 2015

15 X

16 X

17 3. Summary Table for Supporting Calculations The numbers for this table come from the Chapter 8 Worksheets Show increase (+) or decrease (-)

18 SCS METHOD 2 YEAR 2.7 X X

19 GreenForge STORMWATER MANAGEMENT CONTROLS DONOHOE ROAD BIO-INFILTRATION PROTECTED TREES GREEN ROOF INFILTRATION PAVING GREEN ROOF PROTECTED TREES INFILTRATION PAVING GREENFORGE INFILTRATION PAVING INFILTRATION PAVING FOREBAY / WET POND PROTECTED WOODLAND

20 4. Summary Description of PCSM BMPs The numbers for this chart come from the Chapter 8 Worksheets The BMP s listed on this chart must agree with Worksheet 5

21 X X X 250 cft 0.11 ac X X X 250 cft 0.11 ac X X X 2,160 cft 0.12 ac X X X X 700 cft 0.02 ac X X X X 750 cft 0.21 ac

22 Would you only choose one item?

23 5. Off-site Discharge Analysis Discharge of stormwater to areas other than surface water Demonstrate discharge will not cause erosion, damage or nuisance off-site Flow should be documented by legal authorization, easements

24 X

25 6. Potential Pollution Causing Materials Identify naturally occurring geologic formations or soil conditions which may cause pollution Provide BMPs to avoid or minimize any pollution or impacts during earth disturbance

26 7. Riparian Buffer Will the project protect convert or establish a riparian buffer or riparian forest buffer? Riparian Buffer Waiver gone Functionally Equivalent Offset Voluntary riparian buffer or riparian forested buffer

27 New Buffer Requirements WCD 2015

28 8. Thermal Impacts How thermal impacts are avoided, minimized or mitigated: Minimal impervious surfaces Green roof Porous pavement Shade, maximize use of vegetated areas Discharge from bottom of impoundments Subsurface impoundments WCD 2015

29 EXISTING TREES TO REMAIN, COMPLETE SITE LANDSCAPING, PLANTS IN THE BIO-INFILTRATION AREAS, VEGETATED ROOF, STORMWATER RELEASED FROM BOTTOM OF POOL

30 9. Recommended Critical Stages Sequence / stable contributory area Excavation to subgrade / site preparation Stormwater management BMP construction: Earthwork / embankment construction Underdrain (stone layer / geotextile) Pipe materials / connections (underdrain, outlet riser, barrel, cleanout) Soil mix / soil placement / soil ripping Seeding / blankets / mulching / stabilization Plants and plantings

31 CONSTRUCTION OF BASIN EMBANKMENT, INSTALLATION OF BASIN OUTLET STRUCTURE, INSTALLATION OF BIO- INFILTRATION AREAS, TOPSOIL RIPPING AND PLACEMENT OF SOIL AMENDMENTS AND SEEDING

32 NPDES Section E Antidegradation Analysis Module for Individual NPDES Permits in HQ/EV watersheds Non-Discharge Alternatives Evaluation Choose some, don t leave blank! Antidegradation Best Available Combination of Technologies (ABACT) Choose some, don t leave blank!!

33 NPDES Section F Consultant for this Project 1. Qualified professional engineer Structural BMPs 2. Qualified professional surveyor, landscape architect, or other Non-structural BMPs Certain structural BMPs WCD 2015

34

35 NPDES - Worksheets Don t leave blank! Everyone needs WS 1-5 Everyone needs WS 10 Some will use WS 12, 13 Don t CLAIM it unless you can PROVE it!

36 07/07/07 GreenForge Hempfield Twp Westmoreland County 3.0 ACRES Youghiogheny Sewickley Creek Jacks Run UNT to Slate Creek HQ-TSF X X

37 X X X X X X

38 NA NA NA NA

39

40 NA NA NA NA YES NA NA NA

41 GreenForge Stormwater Credits 1,125 sf Minimize Compaction 600 sf Protected Trees 0.48 ac Woodland Protected

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44 1,

PERMIT APPLICATION UNDER THE EROSION AND SEDIMENT POLLUTION CONTROL PERMIT

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