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YCCD NPDES Permitting Workshop
Completing the PCSM Worksheets
March 18, 2015
Completing Standard Worksheets 1-5
Standard Worksheet 1
• Separate Worksheet 1
for each Receiving
Surface Water
• Total Area = Total
Project Area (Section
B.2 of NOI)
Standard Worksheet 2
• Worksheet 2 should
cover Total Project Area
• Sensitive Resources
Map
Standard Worksheet 2
• If claiming Protected
Area, then the type of
protection (easement,
deed restriction, etc.)
shall be
identified/included
Standard Worksheet 3
• Separate Worksheet 3
for each Drainage
Area/Point of Interest
Standard Worksheet 3
• Undisturbed area(s)
can be taken out of
Managed Area by
Reduced Grading
Standard Worksheet 3
• If claiming Volume
Credits, ensure that all
criteria are met
• Include the criteria
checklists in the
application
Standard Worksheet 4
• Separate Worksheet 4
for each Drainage
Area/Point of Interest
Standard Worksheet 4
• Needs to match NOI
Section D.3
• Needs to match
Worksheet 3
Standard Worksheet 4
• Existing Conditions to
be in compliance with
25 Pa Code Sections
102.8(g)(2)(i) and
102.8(g)(2)(ii)
Standard Worksheet 4
• Ex. Conditions Total
Runoff Volume = Box 4
of Section D.3 of NOI
• Dev. Conditions Total
Runoff Volume = Box 5
of Section D.3 of NOI
Standard Worksheet 4
• 2-Year Volume
Increase = Box 6 of
Section D.3 of NOI
Standard Worksheet 4
• All disturbed areas shall be accounted for on
Standard Worksheet 4
• If claiming meadow conditions in post dev.
conditions, then clearly identify the
vegetation/planting and area on the PCSM Plan
Standard Worksheet 5
• Separate Worksheet 5
for each Drainage
Area/Point of Interest
Standard Worksheet 5
• NS Volume Credit
cannot exceed 25% of
Required Volume
• Dev. Total Volume
minus Difference =
Box 7 of Section D.3
Water Quality Compliance:
Worksheets 10-13
• Chapter 8: Stormwater Calculations and
Methodology [Pennsylvania Stormwater Best
Management Practices Manual (PCSM
Manual), DEP Document No. 363-0300-00]
• Chapter 8.6: Stormwater Quality Management
Water Quality Compliance
• Chapter 8.6: Stormwater Quality Management
(Page 7)
• Chapter 8.7.2: Water Quality Calculations
(Page 16)
• Flowchart D
(Page 40)
Water Quality Compliance
• If the site is discharging to one drainage area;
then complete one set of water quality
worksheets
• If the site is discharging to multiple drainage
areas; then complete separate water quality
worksheets for each watershed
Water Quality Compliance
Flow Chart D
• Are you meeting
CG-1/CG-2?
• Yes, left side of chart
• No, right side of chart
Flow Chart D: Meeting CG-1/CG-2
• Is 90 percent of the
disturbed area
controlled by a BMP?
• Yes, to Worksheet 10
• No, to Worksheet 12
Standard Worksheet 10
• 2 Primary BMPs
• Or 4 Secondary BMPs
• Or 1 Primary and
2 Secondary BMPs
• Ensure BMPs are clearly shown on PCSM Plan
• Ensure proper construction, operation and
maintenance notes are on PCSM Plan
• Ensure BMP is in accordance with Chapters 5
or 6 of the Manual
Standard Worksheet 10
Standard Worksheet 10
• Ensure these BMPs
meet all the criteria on
pages 18–26 in
Chapter 8
• Include the checklists
in the application
Standard Worksheet 10
• If meet Worksheet 10,
then obtained assumed
water quality compliance
• If not, got to
Worksheet 12 (only for
NO3)
Flow Chart D: Not Meeting CG-1/CG-2
• Cannot meet
CG-1/CG-2, then go to
Worksheet 11
• Complete Worksheet 12
• Complete Worksheet 13
Standard Worksheet 11
• 2 Primary BMPs
• Ensure BMPs are clearly shown on PCSM Plan
• Ensure proper construction, operation and
maintenance notes are on PCSM Plan
• Ensure BMP is in accordance with Chapters 5
or 6 of the Manual
Standard Worksheet 11
Standard Worksheet 11
• Ensure these BMPs meet
all the criteria on pages
18–26 in Chapter 8
• Include the checklists in
the application
Standard Worksheet 11
• If you meet Worksheet
11, then go to
Worksheet 12
• If not, then you have
not met water quality
compliance
Standard Worksheet 12
• All disturbed area to be
accounted for (match
NOI)
• Cover is based on post
construction conditions
Standard Worksheet 12
• Native Planting Area
• Lawn, Low-Input
• Low Traffic Parking Lot
(same for Worksheet 13)
Standard Worksheet 13
Standard Worksheet 13
• Make sure to account for BMPs in a Series,
i.e. do not double dip on pollutant loading
• If you are doing BMPs in a Series, clearly identify
the separate BMPs in the calculations and you
may need to provide a delineation map to each
BMP
Standard Worksheet 13
• How to handle BMPs in a Series:
– Removal efficiency for series (Chapter 8, Page 11 )
R = 1 – {(1 – r1) * (1 – r2) * (1 – r3)…}
R = Efficiency Removal of Series
ri = Efficiency of BMPi
– First printing of Manual had + instead of *
Standard Worksheet 13
• BMPs in a series:
may modify Worksheet
13 to include a line for
pollutant loading not
removed (pollutants
going downstream)
Water Quality Compliance
• BMPs in a Series:
add line for the
downstream BMP to
account for pollutants not
removed by upstream the
BMP
Standard Worksheet 13
• You cannot use two BMPs in one. A detention
basin with infiltration is either an extended dry
detention basin or an infiltration basin. You
cannot have a Worksheet 13 for the EDDB and a
Worksheet 13 for the infiltration
Table A-4: Summary of Efficiencies
• Table A-4 from
Appendix A of the
Manual
• Watch Water Quality
Filter
Table A-4: Summary of Efficiencies
• These values are generic
and not specific
• If using a manufactured
device, provide the
manufacturer’s removal
efficiencies
Nathan R. Crawford, P.E. Permits Section Chief
Waterways & Wetlands Program South-central Region
(717) 705-4798 [email protected]