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WPO202000042 Calculations 2020-10-26
DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 112011 BMP Standards and Specifications 02013 Draft BMP Standards and Specifications Project Name: WP0202000042_2435 Gobblers Ridge Pond ........................ _._._._._ ..... _._. Id ata input cells Date: 23 OCTOBER BY RGA constant values calculation cells Linear Development Project? No Site Information Post -Development Project (Treatment Volume and Loads) Enter Total Disturbed Area (acres) 4 1.60 Check. BMP Design Specifications List. 2013 Draft Stds & S ecs MaximumLinear project? No The site's net increase in imperviousr Land cover areas entered correctly? Post -Development r TP L• • , I Total disturbed area entered? �I 9 TP LOAD REDUCTION NOT REQUIRED Pre-ReDevelopment Land Cover (acres) A Soils B Soils C Soils D Soils Totals Forest/Open Space (acres) -- undisturbed forest/open space 0.00 Managed Turf (acres) -- disturbed, graded for 1.40 yards or other turf to be mowed/managed 1.40 Impervious Cover (acres) 0.20 0.20 1.60 Post -Development Land Cover (acres) A Soils B Soils C Soils D Soils Totals protected forest/open space or reforested 0.00 Managed Turf (acres) -- disturbed, graded for yards or other turf to be mowed/managed 1.60 1.60 Impervious Cover (acres) 0.00 Area Check OK. OK. OK. OK. 1.60 I Constants Runoff Coefficients (Rv) Annual Rainfall (inches) 43 A Soils B Soils C Soils D Soils Target Rainfall Event (inches) 1.00 Forest/Open Space 0.02 0.03 0.04 0.05 Total Phosphorus (TP) EMC (mg/L) 0.26 Managed Turf 0.15 0.20 0.22 0.25 Total Nitrogen (TN) EMC (mg/L) 1.86 Impervious Cover 0.95 0.95 0.95 0.95 Target TP Load (lb/acre/yr) 0.41 Pj (unitless correction factor) 0.90 ------- --._.... _.... _.... _............ ............... _ • - m •LAND COVER•DEVELOPMENT o Land Cover Summary -Pre Land Cover Summary -Post (Final) , Land Cover Summary -Post _ Land Cover Summary -Post Pre-ReDevelopment Listed Adjusted' Post ReDev. & New Impervious Post-ReDevelopment Post -Development New Impervious Forest/Open Space Cover (acres) 0.00 0.00 Forest/Open Space 0.00 Forest/Open Space 0.00 Cover (acres) Cover (acres) Weighted Rv(forest) 0.00 0.00 Weighted Rv(forest) 0.00 Weighted Rv(forest) 0.00®_- % Forest 0% 0% % Forest 0% % Forest 0% Managed Turf Cover (acres) 1.40 1.40 Managed Turf Cover 1.60 Managed Turf Cover 1.60 (acres) (acres) Weighted Rv(turf) 0.25 0.25 Weighted Rv (turf) 0.25 Weighted Rv (turf) 0.25 % Managed Turf 88% 88% % Managed Turf .. 100% % Managed Turf 100% - Impervious Cover (acres) 0.20 0.20 Impervious Cover 0.00 ReDev. Impervious 0.00 New Impervious Cover 0.00 (acres) Cover (acres) (acres) Rv(impervious) 0.95 0.95 Rv(impervious) 0.95 Rv(impervious) 0.95 Rv(impervious) %Impervious 13% 13% %Impervious 0% %Impervious ........... 0% Total Site Area (acres) 1.60 1.60 Final Site Area (acres) 1.60 Total ReDev. Site Area 1.60 (acres) Site Rv 0.34 0.34 Final Post Dev Site Rv 0.25 ReDev Site Rv 0.25 Treatment Volume and Nutrient Load Treatment Volume and Nutrient Load Final Post -Development Post-ReDevelopment Post -Development Pre-ReDevelopment Treatment Volume 0.0450 0.0450 Treatment Volume 0.0333 Treatment Volume 0.0333 Treatment Volume -- (acre-ft) (acre-ft) (acre-ft) (acre-ft) Pre-ReDevelopment Treatment Volume Final Post -Development Post-ReDevelopment Post -Development 1,960 1,960 Treatment Volume 1,452 Treatment Volume 1,452 Treatment Volume (cubic -- (cubic feet) (cubic feet) (cubic feet) feet) Pre-ReDevelopment TP Load Final Post- Post-ReDevelopment Post -Development TP 1.23 1.23 Development TP Load 0.91 Load (TP) 0.91 -- (lb/yr) (lb/yr) (lb/yr)* Load (Ib/yr) Pre-ReDevelopment Load per acre Final Post -Development TP Post-ReDevelopment TP (Ib/acre/yr) 0.77 0.77 Load per acre 0.57 Load per acre 0.57 (lb/acre/yr) (lb/acre/yr) Baseline TP Load (lb/yr) Max. Reduction Required (0.41 Ibs/acre/yrapplied to pre -redevelopment area excluding pervious 0.66 (Below Pre- 20% land proposed for new impervious cover) ReDevelopment Load) 'Adjusted TP Load Reduction I Land Cover Summary: TP Load Reduction Pre ReDevelopment land cover minus pervious land cover (forest/open space or Required for -0.07 Required for New 0 managed turf) acreage proposed for new impervious cover. Redeveloped Area Impervious Area (Ib/yr) (lb/yr) Adjusted total acreage is consistent with Post-ReDevelopment acreage (minus acreage of new impervious cover). Column I shows load reduction requriement for new impervious cover (based on new development load limit 0.41 Ibs/acre/year). Post -Development Requirementfor TP Load Reduction Required (Ib/yr) -0.07TP LOAD REDUCTION N• • • Nitrogen Loads (Informational Purposes Only) ......................................................... ......... ......... Final Post -Development TN Load Pre-ReDevelopment TN Load (lb/yr) 8.81 (Post-ReDevelopment & New 6.53 Impervious) (lb/yr) I Drainage Area A Drainage Area A Land Cover (acres) A Soils B Soils C Soils D Soils Totals Land Cover Rv Forest/Open Space (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwater Best Man Practice nit Practices Runoff Reduction Credit W RR = Runoff Reduction) Managed Impervious Volume from Runoff Remaining Total BMP Turf Credit Cover Credit Upstream 3 Runoff Volume Treatment Area (acres) Area (acres) Practice (ft3) Reduction (ft ) (ft) Volume (ft3 VRRM WP0202000042_2435 Gobblers Ridge Pond D.A. A Total Phosphorus Available for Removal in D.A. A (lb/yr) 0.00 Post Development Treatment Volume in D.A. A (ft3) 0 --Select from dropdown lists -- Phosphorus Phosphorus Load IUntreated Phosphorus Remaining Downstream Practice to be Removal from Upstream Phosphorus Load Removed By Phosphorus Load Employed Efficiencv M Practices fib) to Practice fib) Practice fib) fib) 1.a. Vegetated Roof #1 (Spec #5) 45 ME= 11111M 0 0 0 0 MEEM 0.00 0.00 0.00 1.b. Vegetated Roof #2 (Spec #5) 60 MEN= MEN= 0 0 0 0 MEN= 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 2.a. Simple Disconnection to A/B Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.b. Simple Disconnection to C/D Soils 25 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.c. To Soil Amended Filter Path as per specifications (existing C/D soils) (Spec #4) 50 0 0 0 0 0 0.00 0.00 0.00 0.00 2.d. To Dry Well or French Drain #1, 50 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Infilration #1 (Spec #8) 2.e. To Dry Well or French Drain #2, 90 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro -Infiltration #2 (Spec #8) 2.f. To Rain Garden #1, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Bioretention #1 (Spec #9) 2.g. To Rain Garden #2, 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Micro-Bioretention #2 (Spec #9) 2.h. To Rainwater Harvesting (Spec #6) 0 Eff 0 0 0 0 0 0.00 0.00 0.00 0.00 2.i. To Stormwater Planter, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Urban Bioretention (Spec #9, Appendix A) 4. Grass Channel (RR) 4.a. Grass Channel A/B Soils (Spec #3) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 4.b. Grass Channel C/D Soils (Spec #3) 10 0 0 0 0 15 0.00 0.00 0.00 0.00 4.c. Grass Channel with Compost Amended Soils 20 0 0 0 0 15 0.00 0.00 0.00 0.00 as per specs (see Spec #4) 6. Bioretention (RR) 6.a. Bioretention #1 or Micro-Bioretention #1 or 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Urban Bioretention (Spec #9) 6.b. Bioretention #2 or Micro-Bioretention #2 80 0 0 0 0 50 0.00 0.00 0.00 0.00 (Spec #9) 7. Infiltration (RR) 7.a. Infiltration #1 (Spec #8) 50 0 0 0 0 25 0.00 0.00 0.00 0.00 7.b. Infiltration #2 (Spec #8) 90 0 0 0 0 25 0.00 0.00 0.00 0.00 8. Extended Detention •. 8.a. ED #1 (Spec #15) 0 0 0 0 0 15 0.00 0.00 0.00 0.00 8.b. ED #2 (Spec #15) 15 0 0 0 0 15 0.00 0.00 0.00 0.00 Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load to Removed By Nitrogen Load Efficiency (%) Practices (Ibs) Practice (Ibs) Practice (Ibs) (Ibs) Vegetated1. •.. 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) rrr rrr rrr rrr rrr � rr rrr rrr rrr rrr rrr rrr rrr rrr rrr r ri rrr rrr rrr rrr 4. Grass Channel (RR) rrr � rr rrr rrr rrr err rrr rrr rrr rrr rrr rrr 10/26/2020 2 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. A 9.a. Sheetflow to Conservation Area, A/B Soils (Spec #2) 75 0 0 0 0 0 0.00 0.00 0.00 0.00 9.b. Sheetflow to Conservation Area, C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.c. Sheetflow to Vegetated Filter Strip, A Soils or Compost Amended B/C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2 & #4) TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. A (ft3) 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS 13. Wet P. . 0 0 0 0 50 0.00 0.00 0.00 0.00 13.a. Wet Pond #1 (Spec #14) 0 13.b. Wet Pond #1 (Coastal Plain) (Spec #14) 0 0 0 0 0 45 0.00 0.00 0.00 0.00 13.c. Wet Pond #2 (Spec #14) 0 0 0 0 0 75 0.00 0.00 0.00 0.00 13.d. Wet Pond #2 (Coastal Plain) (Spec #14) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 14. Manufactured Treatment Devices (no RR) 14.a. Manufactured Treatment Device- 0 0 0 0 0 20 0.00 0.00 0.00 0.00 Hydrodynamic 14.b. Manufactured Treatment Device -Filtering 0 0 0 0 0 20 0.00 0.00 0.00 0.00 14.c. Manufactured Treatment Device -Generic 0 0 0 0 0 20 0.00 0.00 0.00 0.00 TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 1 -0.07 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. A (lb/yr) TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. A (Ib/yr) SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 TOTAL NITROGEN REMOVED IN D.A. A (lb/yr) 0.00 0 0.00 0.00 0.00 0.00 0 0.00 0.00 0.00 0.00 0 0.00 0.00 0.00 0.00 TOTAL RUNOFF REDUCTION IN D.A. A (ft3) 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 25 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 13. Wet Ponds (no RR) 14. Manufactured 14. Manufactured BMP (no RR) 10/26/2020 3 of 24 2:55 PM VRRM WPO202000042_2435 Gobblers Ridge Pond D.A. A 10/26/2020 4 of 24 2:55 PM Drainage Area B Drainage Area A Land Cover (acres) A Soils B Soils C Soils D Soils Totals Land Cover Rv Forest/Open Space (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwater Best Management Practices (RR = Runoff Reduction) Runoff Managed Impervious Volume from Practice Reduction Turf Credit Cover Credit Upstream Credit (%) Area (acres) Area (acres) Practice (ft) VRRM W PO202000042_2435 Gobblers Ridge Pond D.A. B Total Phosphorus Available for Removal in D.A. B (lb/yr) 0.00 Post Development Treatment Volume in D.A. B (ft3) 0 --Select from dropdown lists-- Phosphorus Untreated Runoff Remaining Total BMP Phosphorus Load from Phosphorus Phosphorus Remaining Downstream Practice to be Reduction Runoff Treatment Removal Removed By Phosphorus (ft3) Volume (ft3) Volume (ft3) Efficiency (%) Upstream Load to Practices (lb) Practice (Ibl Practice (lb) Load (lb) Employed La. Vegetated Roof #1 (Spec #5) 45 REM 0 0 0 0 111M 0.00 0.00 0.00 Lb. Vegetated Roof #2 (Spec #5) 60 ME= 0 0 0 0 ME= 0.00 0.00 0.00 2.a. Simple Disconnection to A/B Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.b. Simple Disconnection to C/D Soils 25 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.c. To Soil Amended Filter Path as per 50 0 0 0 0 0 0.00 0.00 0.00 0.00 specifications (existing C/D soils) (Spec #4) 2.d. To Dry Well or French Drain #1, 50 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Infilration #1 (Spec #8) 2.e. To Dry Well or French Drain #2, 90 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro -Infiltration #2 (Spec #8) 2.f. To Rain Garden #1, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Bioretention #1 (Spec #9) 2.g. To Rain Garden #2, 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Micro-Bioretention #2 (Spec #9) 2.h. To Rainwater Harvesting (Spec #6) 0 0 0 0 0 0 0.00 0.00 0.00 0.00 2.i. To Stormwater Planter, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Urban Bioretention (Spec #9, Appendix A) 3.a. Permeable Pavement #1 (Spec #7) 45 0 0 0 0 25 0.00 0.00 0.00 0.00 3.b. Permeable Pavement #2 (Spec #7) 75 0 0 0 25 0.00 0.00 0.00 4. Grass Channel (1111) Eli 4.a. Grass Channel A/B Soils (Spec #3) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 4.b. Grass Channel C/D Soils (Spec #3) 10 0 0 0 0 15 0.00 0.00 0.00 0.00 4.c. Grass Channel with Compost Amended Soils as per specs (see Spec #4) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 6.a. Bioretention #1 or Micro-Bioretention #1 or Urban Bioretention (Spec #9) 6.b. Bioretention #2 or Micro-Bioretention #2 40 0 0 0 0 25 0.00 0.00 0.00 0.00 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load Removed By Nitrogen Efficiency (%) Practices (Ibs) to Practice (Ibs) Practice (Ibs) Load (Ibs) 1. Vegetated .. 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) rrr ■ rrr ��� rrr rrr rrr rrr rrr 4. Grass Channel (RR) ilk rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr 10/26/2020 5 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. B Sheetflow9. • •.Space 9.a. Sheetflow to Conservation Area, A/B Soils 75 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.b. Sheetflow to Conservation Area, C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.c. Sheetflow to Vegetated Filter Strip, A Soils or Compost Amended B/C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2 & #4) TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. B (ft3) 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. B (lb/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr) 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS 10.a. Wet Swale #1 (Spec #11) 0 0 0 0 0 20 0.00 0.00 0.00 0.00 10.b. Wet Swale #2 (Spec #11) 0 0 0 0 0 40 0.00 0.00 0.00 0.00 11.a.Filtering Practice #1 (Spec #12) 0 0 0 0 0 60 0.00 0.00 0.00 0.00 11.b. Filtering Practice #2 (Spec #12) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 Ponds13. Wet 0 0 0 50 0.00 0.00 0.00 0.00 13.a. Wet Pond #1 (Spec #14) 0 0 13.b. Wet Pond #1 (Coastal Plain) (Spec #14) 0 0 0 0 0 45 0.00 0.00 0.00 0.00 13.c. Wet Pond #2 (Spec #14) 0 0 0 0 0 75 0.00 0.00 0.00 0.00 13.d. Wet Pond #2 (Coastal Plain) (Spec #14) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 14. Manufactured Treatment Devices (no RR) 14.a. Manufactured Treatment Device- 0 0 0 0 0 20 0.00 0.00 0.00 0.00 Hydrodynamic 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. B (ft3) 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale (Coastal Plain) (no RR) 30 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 13. Wet Ponds (no RR) 10/26/2020 6 of 24 2:55 PM 10/26/2020 6 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. B 14.b. Manufactured Treatment Device -Filtering 0 0 0 0 0 20 0.00 0.00 0.00 0.00 14.c. Manufactured Treatment Device -Generic 0 0 0 0 0 20 0.00 0.00 0.00 0.00 TOTAL IMPERVIOUS COVER TREATED (ac)l 0.00 1 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.07 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. B (Ib/yr) TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr) TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr) TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. B (Ib/yr) TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. B (Ib/yr) 0.00 1 0.00 1 0.00 0.00 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr) 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr) 0.00 TOTAL NITROGEN REMOVED IN D.A. B (Ib/yr) 0.00 0 0.00 0.00 0.00 0.00 0 0.00 0.00 0.00 0.00 10/26/2020 7 of 24 2:55 PM Drainage Area C Drainage Area A Land Cover (acres) A Soils B Soils C Soils D Soils Totals Land Cover Rv Forest/Open Space (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwater Best Management Practices (RR = Runoff Reduction) Runoff Managed Impervious Volume from Practice Reduction Turf Credit Cover Credit Upstream Credit (%) Area (acres) Area (acres) Practice (ft) VRRM W PO202000042_2435 Gobblers Ridge Pond D.A. C Total Phosphorus Available for Removal in D.A. C (lb/yr) 0.00 Post Development Treatment Volume in D.A. C (ft) 0 --Select from dropdown lists-- Phosphorus Untreated Runoff Remaining Total BMP Phosphorus Load from Phosphorus Phosphorus Remaining Downstream Practice to be Reduction Runoff Treatment Removal Removed By Phosphorus (ft3) Volume (ft3) Volume (ft3) Efficiency (%) Upstream Load to Practices (lb) Practice (Ibl Practice (lb) Load (lb) Employed La. Vegetated Roof #1 (Spec #5) 45 REM 0 0 0 0 111M 0.00 0.00 0.00 1.b. Vegetated Roof #2 (Spec #5) 60 ME= 0 0 0 0 ME= 0.00 0.00 0.00 2.a. Simple Disconnection to A/B Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.b. Simple Disconnection to C/D Soils 25 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.c. To Soil Amended Filter Path as per 50 0 0 0 0 0 0.00 0.00 0.00 0.00 specifications (existing C/D soils) (Spec #4) 2.d. To Dry Well or French Drain #1, 50 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Infilration #1 (Spec #8) 2.e. To Dry Well or French Drain #2, 90 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro -Infiltration #2 (Spec #8) 2.f. To Rain Garden #1, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Bioretention #1 (Spec #9) 2.g. To Rain Garden #2, 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Micro-Bioretention #2 (Spec #9) 2.h. To Rainwater Harvesting (Spec #6) 0 0 0 0 0 0 0.00 0.00 0.00 0.00 2.i. To Stormwater Planter, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Urban Bioretention (Spec #9, Appendix A) 3.a. Permeable Pavement #1 (Spec #7) 45 0 0 0 0 25 0.00 0.00 0.00 0.00 3.b. Permeable Pavement #2 (Spec #7) 75 0 0 0 25 0.00 0.00 0.00 4. Grass Channel (1111) Eli 4.a. Grass Channel A/B Soils (Spec #3) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 4.b. Grass Channel C/D Soils (Spec #3) 10 0 0 0 0 15 0.00 0.00 0.00 0.00 4.c. Grass Channel with Compost Amended Soils as per specs (see Spec #4) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 6.a. Bioretention #1 or Micro-Bioretention #1 or Urban Bioretention (Spec #9) 6.b. Bioretention #2 or Micro-Bioretention #2 40 0 0 0 0 25 0.00 0.00 0.00 0.00 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load Removed By Nitrogen Efficiency (%) Practices (Ibs) to Practice (Ibs) Practice (Ibs) Load (Ibs) 1. Vegetated .. 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) rrr ■ rrr ��� rrr rrr rrr rrr rrr 4. Grass Channel (RR) ilk rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr 10/26/2020 8 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. C Sheetflow9. • •.Space 9.a. Sheetflow to Conservation Area, A/B Soils 75 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.b. Sheetflow to Conservation Area, C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.c. Sheetflow to Vegetated Filter Strip, A Soils or Compost Amended B/C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2 & #4) TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. C (ft3) 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. C (lb/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (lb/yr) 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. C (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS 10.a. Wet Swale #1 (Spec #11) 0 0 0 0 0 20 0.00 0.00 0.00 0.00 10.b. Wet Swale #2 (Spec #11) 0 0 0 0 0 40 0.00 0.00 0.00 0.00 11.a.Filtering Practice #1 (Spec #12) 0 0 0 0 0 60 0.00 0.00 0.00 0.00 11.b. Filtering Practice #2 (Spec #12) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 Ponds13. Wet 0 0 0 50 0.00 0.00 0.00 0.00 13.a. Wet Pond #1 (Spec #14) 0 0 13.b. Wet Pond #1 (Coastal Plain) (Spec #14) 0 0 0 0 0 45 0.00 0.00 0.00 0.00 13.c. Wet Pond #2 (Spec #14) 0 0 0 0 0 75 0.00 0.00 0.00 0.00 13.d. Wet Pond #2 (Coastal Plain) (Spec #14) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 14. Manufactured Treatment Devices (no RR) 14.a. Manufactured Treatment Device- 0 0 0 0 0 20 0.00 0.00 0.00 0.00 Hydrodynamic 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. C (ft3) 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale (Coastal Plain) (no RR) 30 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 13. Wet Ponds (no RR) 10/26/2020 9 of 24 2:55 PM 10/26/2020 9 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. C 14.b. Manufactured Treatment Device -Filtering 0 0 0 0 0 20 0.00 0.00 0.00 0.00 14.c. Manufactured Treatment Device -Generic 0 0 0 0 0 20 0.00 0.00 0.00 0.00 TOTAL IMPERVIOUS COVER TREATED (ac)l 0.00 1 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.07 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. C (Ib/yr) TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr) TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr) TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. C (Ib/yr) TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. C (Ib/yr) 0.00 1 0.00 1 0.00 0.00 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr) 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr) 0.00 TOTAL NITROGEN REMOVED IN D.A. C (Ib/yr) 0.00 0 0.00 0.00 0.00 0.00 0 0.00 0.00 0.00 0.00 10/26/2020 10 of 24 2:55 PM Drainage Area D Drainage Area A Land Cover (acres) A Soils B Soils C Soils D Soils Totals Land Cover Rv Forest/Open Space (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwater Best Management Practices (RR = Runoff Reduction) Runoff Managed Impervious Volume from Practice Reduction Turf Credit Cover Credit Upstream Credit (%) Area (acres) Area (acres) Practice (ft) VRRM W PO202000042_2435 Gobblers Ridge Pond D.A. D Total Phosphorus Available for Removal in D.A. D (lb/yr) 0.00 Post Development Treatment Volume in D.A. D (ft3) 0 --Select from dropdown lists-- Phosphorus Untreated Runoff Remaining Total BMP Phosphorus Load from Phosphorus Phosphorus Remaining Downstream Practice to be Reduction Runoff Treatment Removal Removed By Phosphorus (ft3) Volume (ft3) Volume (ft3) Efficiency (%) Upstream Load to Practices (lb) Practice (Ibl Practice (lb) Load (lb) Employed La. Vegetated Roof #1 (Spec #5) 45 REM 0 0 0 0 111M 0.00 0.00 0.00 1.b. Vegetated Roof #2 (Spec #5) 60 ME= 0 0 0 0 ME= 0.00 0.00 0.00 2.a. Simple Disconnection to A/B Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.b. Simple Disconnection to C/D Soils 25 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.c. To Soil Amended Filter Path as per 50 0 0 0 0 0 0.00 0.00 0.00 0.00 specifications (existing C/D soils) (Spec #4) 2.d. To Dry Well or French Drain #1, 50 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Infilration #1 (Spec #8) 2.e. To Dry Well or French Drain #2, 90 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro -Infiltration #2 (Spec #8) 2.f. To Rain Garden #1, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Bioretention #1 (Spec #9) 2.g. To Rain Garden #2, 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Micro-Bioretention #2 (Spec #9) 2.h. To Rainwater Harvesting (Spec #6) 0 0 0 0 0 0 0.00 0.00 0.00 0.00 2.i. To Stormwater Planter, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Urban Bioretention (Spec #9, Appendix A) 3.a. Permeable Pavement #1 (Spec #7) 45 0 0 0 0 25 0.00 0.00 0.00 0.00 3.b. Permeable Pavement #2 (Spec #7) 75 0 0 0 25 0.00 0.00 0.00 4. Grass Channel (1111) Eli 4.a. Grass Channel A/B Soils (Spec #3) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 4.b. Grass Channel C/D Soils (Spec #3) 10 0 0 0 0 15 0.00 0.00 0.00 0.00 4.c. Grass Channel with Compost Amended Soils as per specs (see Spec #4) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 6.a. Bioretention #1 or Micro-Bioretention #1 or Urban Bioretention (Spec #9) 6.b. Bioretention #2 or Micro-Bioretention #2 40 0 0 0 0 25 0.00 0.00 0.00 0.00 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load Removed By Nitrogen Efficiency (%) Practices (Ibs) to Practice (Ibs) Practice (Ibs) Load (Ibs) 1. Vegetated .. 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) rrr ■ rrr ��� rrr rrr rrr rrr rrr 4. Grass Channel (RR) ilk rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr 10/26/2020 11 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. D Sheetflow9. • •.Space 9.a. Sheetflow to Conservation Area, A/B Soils 75 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.b. Sheetflow to Conservation Area, C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.c. Sheetflow to Vegetated Filter Strip, A Soils or Compost Amended B/C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2 & #4) TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. D (ft3) 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. D (lb/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (lb/yr) 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. D (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS 10.a. Wet Swale #1 (Spec #11) 0 0 0 0 0 20 0.00 0.00 0.00 0.00 10.b. Wet Swale #2 (Spec #11) 0 0 0 0 0 40 0.00 0.00 0.00 0.00 11.a.Filtering Practice #1 (Spec #12) 0 0 0 0 0 60 0.00 0.00 0.00 0.00 11.b. Filtering Practice #2 (Spec #12) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 Ponds13. Wet 0 0 0 50 0.00 0.00 0.00 0.00 13.a. Wet Pond #1 (Spec #14) 0 0 13.b. Wet Pond #1 (Coastal Plain) (Spec #14) 0 0 0 0 0 45 0.00 0.00 0.00 0.00 13.c. Wet Pond #2 (Spec #14) 0 0 0 0 0 75 0.00 0.00 0.00 0.00 13.d. Wet Pond #2 (Coastal Plain) (Spec #14) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 14. Manufactured Treatment Devices (no RR) 14.a. Manufactured Treatment Device- 0 0 0 0 0 20 0.00 0.00 0.00 0.00 Hydrodynamic 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. D (ft3) 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale (Coastal Plain) (no RR) 30 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 13. Wet Ponds (no RR) 10/26/2020 12 of 24 2:55 PM 10/26/2020 12 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. D 14.b. Manufactured Treatment Device -Filtering 0 0 0 0 0 20 0.00 0.00 0.00 0.00 14.c. Manufactured Treatment Device -Generic 0 0 0 0 0 20 0.00 0.00 0.00 0.00 TOTAL IMPERVIOUS COVER TREATED (ac)l 0.00 1 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.07 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. D (Ib/yr) TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr) TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr) TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. D (Ib/yr) TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. D (Ib/yr) 0.00 1 0.00 1 0.00 0.00 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr) 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr) 0.00 TOTAL NITROGEN REMOVED IN D.A. D (Ib/yr) 0.00 0 0.00 0.00 0.00 0.00 0 0.00 0.00 0.00 0.00 10/26/2020 13 of 24 2:55 PM Drainage Area E Drainage Area A Land Cover (acres) A Soils B Soils C Soils D Soils Totals Land Cover Rv Forest/Open Space (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwater Best Management Practices (RR = Runoff Reduction) Runoff Managed Impervious Volume from Practice Reduction Turf Credit Cover Credit Upstream Credit (%) Area (acres) Area (acres) Practice (ft) VRRM W PO202000042_2435 Gobblers Ridge Pond D.A. E Total Phosphorus Available for Removal in D.A. E (lb/yr) 0.00 Post Development Treatment Volume in D.A. E (ft3) 0 --Select from dropdown lists-- Phosphorus Untreated Runoff Remaining Total BMP Phosphorus Load from Phosphorus Phosphorus Remaining Downstream Practice to be Reduction Runoff Treatment Removal Removed By Phosphorus (ft3) Volume (ft3) Volume (ft3) Efficiency (%) Upstream Load to Practices (lb) Practice (Ibl Practice (lb) Load (lb) Employed La. Vegetated Roof #1 (Spec #5) 45 REM 0 0 0 0 111M 0.00 0.00 0.00 1.b. Vegetated Roof #2 (Spec #5) 60 ME= 0 0 0 0 ME= 0.00 0.00 0.00 2.a. Simple Disconnection to A/B Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.b. Simple Disconnection to C/D Soils 25 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #1) 2.c. To Soil Amended Filter Path as per 50 0 0 0 0 0 0.00 0.00 0.00 0.00 specifications (existing C/D soils) (Spec #4) 2.d. To Dry Well or French Drain #1, 50 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Infilration #1 (Spec #8) 2.e. To Dry Well or French Drain #2, 90 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro -Infiltration #2 (Spec #8) 2.f. To Rain Garden #1, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Micro-Bioretention #1 (Spec #9) 2.g. To Rain Garden #2, 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Micro-Bioretention #2 (Spec #9) 2.h. To Rainwater Harvesting (Spec #6) 0 0 0 0 0 0 0.00 0.00 0.00 0.00 2.i. To Stormwater Planter, 40 0 0 0 0 25 0.00 0.00 0.00 0.00 Urban Bioretention (Spec #9, Appendix A) 3.a. Permeable Pavement #1 (Spec #7) 45 0 0 0 0 25 0.00 0.00 0.00 0.00 3.b. Permeable Pavement #2 (Spec #7) 75 0 0 0 25 0.00 0.00 0.00 4. Grass Channel (1111) Eli 4.a. Grass Channel A/B Soils (Spec #3) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 4.b. Grass Channel C/D Soils (Spec #3) 10 0 0 0 0 15 0.00 0.00 0.00 0.00 4.c. Grass Channel with Compost Amended Soils as per specs (see Spec #4) 20 0 0 0 0 15 0.00 0.00 0.00 0.00 6.a. Bioretention #1 or Micro-Bioretention #1 or Urban Bioretention (Spec #9) 6.b. Bioretention #2 or Micro-Bioretention #2 40 0 0 0 0 25 0.00 0.00 0.00 0.00 80 0 0 0 0 50 0.00 0.00 0.00 0.00 Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load Removed By Nitrogen Efficiency (%) Practices (Ibs) to Practice (Ibs) Practice (Ibs) Load (Ibs) 1. Vegetated .. 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) rrr ■ rrr ��� rrr rrr rrr rrr rrr 4. Grass Channel (RR) ilk rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr rrr 10/26/2020 14 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. E Sheetflow9. • •.Space 9.a. Sheetflow to Conservation Area, A/B Soils 75 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.b. Sheetflow to Conservation Area, C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2) 9.c. Sheetflow to Vegetated Filter Strip, A Soils or Compost Amended B/C/D Soils 50 0 0 0 0 0 0.00 0.00 0.00 0.00 (Spec #2 & #4) TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. E (ft3) 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. E (lb/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (lb/yr) 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. E (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS 10.a. Wet Swale #1 (Spec #11) 0 0 0 0 0 20 0.00 0.00 0.00 0.00 10.b. Wet Swale #2 (Spec #11) 0 0 0 0 0 40 0.00 0.00 0.00 0.00 11.a.Filtering Practice #1 (Spec #12) 0 0 0 0 0 60 0.00 0.00 0.00 0.00 11.b. Filtering Practice #2 (Spec #12) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 Ponds13. Wet 0 0 0 50 0.00 0.00 0.00 0.00 13.a. Wet Pond #1 (Spec #14) 0 0 13.b. Wet Pond #1 (Coastal Plain) (Spec #14) 0 0 0 0 0 45 0.00 0.00 0.00 0.00 13.c. Wet Pond #2 (Spec #14) 0 0 0 0 0 75 0.00 0.00 0.00 0.00 13.d. Wet Pond #2 (Coastal Plain) (Spec #14) 0 0 0 0 0 65 0.00 0.00 0.00 0.00 14. Manufactured Treatment Devices (no RR) 14.a. Manufactured Treatment Device- 0 0 0 0 0 20 0.00 0.00 0.00 0.00 Hydrodynamic 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. E (ft3) 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (lb/yr) 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale (Coastal Plain) (no RR) 30 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 13. Wet Ponds (no RR) 10/26/2020 15 of 24 2:55 PM 10/26/2020 15 of 24 2:55 PM VRRM W P0202000042_2435 Gobblers Ridge Pond D.A. E 14.b. Manufactured Treatment Device -Filtering 0 0 0 0 0 20 0.00 0.00 0.00 0.00 14.c. Manufactured Treatment Device -Generic 0 0 0 0 0 20 0.00 0.00 0.00 0.00 TOTAL IMPERVIOUS COVER TREATED (ac)l 0.00 1 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.07 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. E (Ib/yr) TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr) TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr) TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. E (Ib/yr) TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. E (Ib/yr) 0.00 1 0.00 1 0.00 0.00 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr) 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr) 0.00 TOTAL NITROGEN REMOVED IN D.A. E (Ib/yr) 0.00 0 0.00 0.00 0.00 0.00 0 0.00 0.00 0.00 0.00 10/26/2020 16 of 24 2:55 PM Site Results (Water Quality Compliance) Area Checksi D.A. A 11 D.A I D.A. C 11 D.A. D 11 D.A. E AREA CHECK FOREST/OPEN SPACE (ac) 0.00 0.00 0.00 0.00 0.00 OK, IMPERVIOUS COVER (ac) 0.00 0.00 0.00 0.00 0.00 OK. IMPERVIOUS COVER TREATED (ac) 0.00 0.00 0.00 0.00 0.00 OK. MANAGED TURF AREA (ac) 0.00 0.00 0.00 0.00 0.00 OK. MANAGED TURF AREA TREATED (ac) 0.00 0.00 0.00 0.00 0.00 OK, AREA CHECK OK. OK. OK. OK. OK, Site Treatment Volume (ft) 1,452 Runoff Reduction Volume and TP By Drainage Area, D.A. A D.A. B D.A. C D.A. D D.A. E TOTAL RUNOFF REDUCTION VOLUME ACHIEVED (ft) 0 0 0 0 0 0 TP LOAD AVAILABLE FOR REMOVAL (Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 TP LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 TP LOAD REMAINING (Ib/yr) I 0.0=1 0.00 11 0-0=01 0.00 IF 0.00 I0.00 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 Total Phosphorus FINAL POST -DEVELOPMENT TP LOAD (Ib/yr)jj 0.91 TP LOAD REDUCTION REQUIRED (Ib/yr) -0.07 TP LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 TP LOAD REMAINING (Ib/yr): 0.91 REMAINING TP LOAD REDUCTION REQUIRED (Ib/yr): 0.00 ** ** TARGET TP REDUCTION EXCEEDED BY 0.07 LB/YEAR ** Total Nitrogen (For Information Purposes) POST -DEVELOPMENT LOAD (Ib/yr) 6.53 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 REMAINING POST -DEVELOPMENT NITROGEN LOAD (Ib/yr) 6.53 Runoff Volume and Curve Number Calculations Enter design storm rainfall depths (in): 1-year storm 2-year storm 10-year storm 0.00 0.00 0.00 F Use NOAA Atlas 14(http://hdsc.nws.noaa.govlhdsclpfdsl) [1] The curve numbers and runoff volumes computed in this spreadsheet for each drainage area are limited in their applicability for determining and demonstrating compliance with water quantity requirements. See VRRM User's Guide and Documentation for additional information. [2] Runoff Volume (RV) for pre- and post -development drainage areas must be in volumetric units (e.g., acre-feet or cubic feet) when using the Energy Balance Equation. Runoff measured in watershed -inches and shown in the spreadsheet as RV(watershed-inch) can only be used in the Energy Balance Equation when the pre- and post -development drainage areas are equal. Otherwise RV(watershed-inch) must be multiplied by the drainage area. [3] Adjusted CNs are based on runoff reduction volumes as calculated in D.A. tabs. An alternative CN adjustment calculation for Vegetated Roofs is included in BMP specification No. 5. Drainage Area Curve Numbers and Runoff Depths* Curve numbers (CN, CNadj) and runoff depths (RV Developed) are computed with and without reduction practices. Drainage Area A A Soils B Soils C Soils D Soils Total Area (acres): 0.00 Forest/Open Space -- undisturbed, protected Area (acres) 0.00 0.00 0.00 0.00 Runoff Reduction forest/open space or reforested land CN 30 55 70 77 Volume (ft): 0 Managed Turf -- disturbed, graded for yards or other Area (acres) 0.00 0.00 0.00 0.00 turf to be mowed/managed CN 39 61 74 80 Impervious Cover Area (acres) 0.00 0.00 0.00 0.00 CN 98 98 98 98 'I I1-year storm 2-year storm 10-year storm RVDeveloped (watershed -inch) with no Runoff Reduction* 0.00 0.00 0.00 RVDeveloped (watershed -inch) with Runoff Reduction* Adjusted CN* 0.00 0 0.00 0 0.00 0 *See Notes above Drainage Area B A Soils B Soils C Soils D Soils Total Area (acres): 0.00 Forest/Open Space -- undisturbed, protected forest/open space or reforested land Area (acres) 0.00 30 0.00 55 0.00 70 0.00 77 Runoff Reduction Volume (ft): 0 CN Managed Turf -- disturbed, graded for yards or other turf to be mowed/managed Area (acres) 0.00 39 0.00 61 0.00 74 0.00 80 CN Impervious Cover Area (acres) 0.00 98 0.00 98 0.00 98 0.00 98 CN CN(D.A. B) 0 1-year storm 2-year storm 10-year storm ! RVDeveloped (watershed -inch) with no Runoff Reduction* 0.00 0.00 0.00 RVDeveloped (watershed -inch) with Runoff Reduction* 0.00 0.00 0.00 Adjusted CN* 0 0 0 *See Notes above Drainage Area C A Soils B Soils C Soils D Soils Total Area (acres): 0.00 Forest/Open Space -- undisturbed, protected forest/open space or reforested land Area (acres) 0.00 30 0.00 55 0.00 70 0.00 77 Runoff Reduction Volume (ft): 0 CN Managed Turf -- disturbed, graded for yards or other turf to be mowed/managed Area (acres) 0.00 39 0.00 61 0.00 74 0.00 80 CN Impervious Cover Area (acres) 0.00 98 0.00 98 0.00 98 0.00 98 CN CN(D.A. q 0 1-year storm 12-year storm 10-year storm RVDeveloped (watershed -inch) with no Runoff Reduction* 0.00 0.00 0.00 RVDeveloped (watershed -inch) with Runoff Reduction* 0.00 0.00 0.00 Adjusted CN* 0 0 0 *See Notes above Drainage Area D A Soils B Soils C Soils D Soils Total Area (acres): 0.00 Forest/Open Space -- undisturbed, protected forest/open space or reforested land Area (acres) 0.00 30 0.00 55 0.00 70 0.00 77 Runoff Reduction Volume (ft): 0 CN Managed Turf -- disturbed, graded for yards or other turf to be mowed/managed Area (acres) 0.00 39 0.00 61 0.00 74 0.00 80 CN Impervious Cover Area (acres) 0.00 98 0.00 98 0.00 98 0.00 98 CN CN(D.A. D) 0 1-year storm 2-year storm 10-year storm RVDeveloped (watershed -inch) with no Runoff Reduction 0.00 0.00 0.00 RVDeveloped (watershed -inch) with Runoff Reduction* 0.00 0.00 0.00 Adjusted CN* 0 0 0 *See Notes above Drainage Area E A Soils B Soils C Soils D Soils Total Area (acres): 0.00 Forest/Open Space -- undisturbed, protected forest/open space or reforested land Area (acres) 0.00 30 0.00 55 0.00 70 0.00 77 Runoff Reduction Volume (ft): 0 CN Managed Turf -- disturbed, graded for yards or other turf to be mowed/managed Area (acres) 0.00 39 0.00 61 0.00 74 0.00 80 CN Impervious Cover Area (acres) 0.00 98 0.00 98 0.00 98 0.00 98 CN CN(D.A. E) 0 1-year storm 2-year storm 10-year storm RVDeveloped (watershed -inch) with no Runoff Reduction* ' 0.00 ' 0.00 1 0.00 ' RVDeveloped (watershed -inch) with Runoff Reduction* 0.00 0.00 0.00 Adjusted CN* 0 0 0 *See Notes above Virginia Runoff Reduction Method Worksheet DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Draft Stds & Specs Site Summary Project Title: WPO202000042_2435 Gobblers Ridge Pond Date: 23 OCTOBER BY RGA Total Rainfall (in): 43 Total Disturbed Acreage: 1.60 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) A soils B Soils C Soils D Soils Totals % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 1.40 1.40 88 Impervious Cover (acres) 0.00 0.00 0.00 0.20 0.20 13 1.60 100 Post-ReDevelopment Land Cover (acres) A soils B Soils C Soils D Soils Totals % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 1.60 1.60 100 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0 1.60 100 Site Tv and Land Cover Nutrient Loads Final Post -Development Post- Post- Adjusted Pre- (Post-ReDevelopment Development Impervious) & New Im p ) ReDevelopment (New Impervious) ReDevelopment Site Rv 0.25 0.25 0.34 Treatment Volume (ft)1 1,452 1,452 1 1 11960 TP Load (lb/yr) 1 0.91 0.91 1.23 Total TP Load Reduction Required (lb/yr) -0.07 -0.07 0 Final Post -Development Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (lb/yr) 6.53 8.81 Pre- ReDevelopment Final Post -Development Post-ReDevelopment TP TP Load per acre TP Load per acre Load per acre Ib acre r (lb/acre/yr) (lb/acre/yr) 0.77 0.57 0.57 Summary Print Virginia Runoff Reduction Method Worksheet Site Compliance Summary Maximum % Reduction Required Below Pre-ReDevelopment Load20/ Total Runoff Volume Reduction (ft) 0 Total TP Load Reduction Achieved (lb/yr) 0.00 Total TN Load Reduction Achieved (lb/yr) 0.00 Remaining Post Development TP Load 0.91 (lb/yr) Remaining TP Load Reduction (lb/yr) Required 0.00 ** TARGET TP REDUCTION EXCEEDED BY 0.07 LB/YEAR ** Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Total Area (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Drainage Area Compliance Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total TIP Load Reduced (lb/yr) 0.00 0.00 0.00 0.00 0.00 0.00 TN Load Reduced (lb/yr) 0.00 0.00 0.00 0.00 0.00 0.00 Summary Print Virginia Runoff Reduction Method Worksheet Runoff Volume and CN Calculations 1-year storm 2-year storm 10-year storm Target Rainfall Event (in) 1 0.00 0.00 0.00 Drainage Areas RV & CN Drainage Area A Drainage Area B Drainage Area C Drainage Area D Drainage Area E CN 0 0 0 0 0 RR (ft;) 0 0 0 0 0 1-year return period RV wo RR (ws-in) 0.00 0.00 0.00 0.00 0.00 RV w RR (ws-in) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 2-year return period RV wo RR (ws-in) 0.00 0.00 0.00 0.00 0.00 RV w RR (ws-in) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 10-year return period RV wo RR (ws-in) 0.00 0.00 0.00 0.00 0.00 RV w RR (ws-in) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 Summary Print VRRM WPO202000042_2435 Gobblers Ridge Pond Version 2.8 - June 2014 - 2011 BMP Stds & Specs 1 Fixed summary sheet - totals /percentage column fixed 2 Corrected nitrogen efficiency percentages 3 Corrected the Rv value in column J for managed turf 4 Checked and revised runoff reduction credit values assigned Version 3.0 - 2011 and draft 2013 BMP Stds & Specs General 1 Added error checks and user prompts to Site tab, DA tabs, and Runoff Volume and CN tab for data input errors. 2 Various format changes thoughout the spreadsheet. 3 Combined 2011 and 2013 BMP spreadsheets into one spreadsheet with a user selection option included in Site tab. 4 User input cell color changed from cyan blue to green; calculation cells changed from mid -grey to light grey; and added final result cell in indigo. Site tab 5 Locked annual rainfall of 43 inches for use throughout Virginia since regulatory site based TP load limit is based on this value. 6 Corrected error in formula for total phosporus load reduction requirement. Previous formula was inconsistent with 9VAC25-870-63 A.2 and under certain circumstances provided erroneous TP load reduction requirement for development on prior developed lands. 7 Added button and shortcut (Ctrl+Shift+R) to clear user inputs from all worksheets. 8 Added shortcut (Ctrl+Shift+D) to clear land cover data from Site tab. 9 Added TP Baseline Load for adjusted pre-redevelopement portion (cell C58). 10 Added note (triggered to appear when applicable) below "Land Cover Summary for Redevelopment" - indicating that reduction below baseline TP load (<0.41 Ibs/acre) not required as per 9VAC25-870-63. 11 Added error messages when data input areas incomplete or not entered correctly. 12 Conditional formatting (Summary sections grayed out) when input information incomplete or incorrect. 13 Added Pre -redevelopment and Post -development load in Ibs/acre/yr (row 57) for additional comparison purposes 14 Corrected error in excel formula for new impervious cover Rv. 15 Corrected errors in excel formula for total site area and Rv's in redevelopment portion: error appeared when soil types change between pre -redevelopment and post -development with no net increases in impervious increase. 16 Added section for Final Post -Development to Land Cover Summaries to show combination of redevelopment portion and new net impervious cover portion. 17 Added informational section in blue (columns B to F, rows 12-14) and inputterror guide (columns H to K, rows 12-14) to indicate to users upfront when new net impervious cover is being triggered, when 10 or 20% reductions are being utilized, and when data entry is completed correctly. 18 Added data entry instruction when user inputs blank (row 8). 19 Added option for linear development projects (row 6, and cells D64-G64) 20 Removed "protected" from pre -redevelopment land cover type forest/open space since this is only required in post -development. (08/22/2017) 21 Added error notification to side error notes if total disturbed acreage entered is greater than post -development area entered. (08/22/2017) D.A. tabs 22 Added MTDs: Hydrodynamic, Filtering, Generic. 23 Added "Total BMP Treatment Volume (ft)" column. 24 Rearranged previous Turf and Impervious input rows to adjacent cells in same row so each practice now located on 1 row only. 25 Consolidated BMP Practice heading and added (RR or no RR label) to each practice to identify those with and without Runoff Reduction. 26 Added " Total Phosphorus Available for Removal in D.A. _ (Ibs)". 27 Added button to clear BMP credit areas entered for each practice. 28 Added user prompts to assist with user -input Rainwater Harvesting runoff reduction credit, and MTDs. 29 Renamed Credit and Phosphorus/Nitrogen Efficiency column headers to Runoff Removal Credit and Phosphorus/Nitrogen Removal Efficiency for clarity. 30 Removed "RR" from Column headings referring to runoff volume and TP load from upstream practices (which may be RR or non -RR practices). 31 Renamed "10. Wet Swale (Coastal Plain)" to "10. Wet Swale" in BMP heading in order to improve clarity. The practice is well suited for but not limited to the Coastal Plain. 32 Renamed "14. Manufactured BMPs" section heading to "14. Manufactured Treatment Device"s for consistency with Virginia BMP Clearinghouse. 33 Added "Micro-Bioretention #1" and "Micro-Bioretention #2" to Bioretention headings (6.a and 6.b on tab, respectively) from Spec 9. 34 Replaced zero values from all data entry cells with blank cells, blocked out calculation and data entry cells where input or calculations are not applicable. Water Quality Compliance tab 35 Optimized and reorganized for improved information output. 36 Added "Runoff Reduction Volume and TP By Drainage Area". 37 Added section for linear development projects (rows 21-26) Runoff Volume and CN tab 38 Reorganized and renamed Channel and Flood Protection tab to Runoff Volume and CN to more accurately reflect information provided. 39 Added user notes regarding limitations of Runoff Volume and CN tab for water quantity calculations. 40 Renamed CN,,Qghtd to CNtp.A_ xt for the CNs based on soils and land cover types for each drainage area Summary tab 41 Added "Print Preview' button. 42 Fixed runtime error in Summary tab update macro. 43 Added "BMP Treatment Volume", "TP Load from Upstream practice", "TP Removed" and "TP remaining" columns to Summary tab. 44 Optimized macro efficiency and eliminated screen updating/flashing during macros. 45 Corrected Summary tab macro -Turf missing routine missing 46 Added additional pre and post site data onto Summary tab. 47 Added Error Summary Table to Summary tab (appears only if errors on Site tab or Drainage Area tabs are present) 48 Expanded and improved Runoff Coefficient and CN calculation section. 49 Added summary information for linear projects, only populates if applicable. 50 Macro glitch with MS Excel 2016 corrected. (08/22/2017) VRRM WPO202000042_2435 Gobblers Ridge Pond 51 Added Project Title and Date from Site tab. (8/22/2017)