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HomeMy WebLinkAboutWPO201900042 Calculations Stormwater Management Plan 2019-07-10 SPRINGHILL VILLAGE VSMP STORM WATER MANAGEMENT CALCULATIONS PACKET Date of Calculations JULY 10, 2019 PREPARED BY: rgli COLLINS E- NCSH,- -E- E- P. ING • '17 200 GARRETT STREET, SUITE K CHARLOTTESVILLE,VA 22902 :• 434.293.3719 PH APPROVED 434.293.2813 FX by the Albemarle County www.collins-engineering.com Community De,elorent Department Date File [A.)PO jog 000 Li 0., SCS TR-55 Calculations Soils Mapping (Source: NRCS Web Soil Survey Online Database) JJ iiii , . ftl, y ‘4,,,, .,,,tis, .s.,4 .. - _... . , . , . ._ _ 114 1.`, ‘wi4k Niv ..1 7: _.' ... 1 , ' • , s ,11 , • ' r S( - '. . .�.M { i1110 # `� fix^` t - �!'" , • r t.. ,. . ,,, 411A.leittiNWOIF r ' �t- Soils Table (Source: NRCS Web Soil Survey Online Database) Albemarle County,Virginia(VA003) Albemarle County, Virginia (VA003) Map Unit Map Unit Name percent of Symbol AOI 58C Myersville silt 26.5% loam, 7 to 15 percent slopes 58D Myersville silt 18.6% loam, 15 to 25 percent slopes 7113 Rabun clay 0.0% loam, 2 to 7 percent slopes 72C3 Rabun clay, 7 to 51.7% 15 percent slopes, severely eroded 79B Starr silt loam, 2 3.2% to 7 percent slopes Totals for Area of 100.0% Interest Note: The soils' properties witin this development are predominantly composed of hydrologic group type B soils. Precipitation Data (Source: NOAA's National Weather Service, Hydrometerorological Design Studies Center, Atlas 14 Point Precipitation Frequency Estimates) it " Map Terrain w 6 ti 4` l 3 m Pc 100m l `J 300ft 1) POINT PRECIPITATION FREQUENCY (PF) ESTIMATES WITH 90%CONFIDENCE INTERVALS AND SUPPLEMENTARY INFORMATION NOAA Atlas 14,Volume 2,Version 3 PDS-based precipitation frequency estimates with 90%confidence intervals(in inches)1 I Average recurrence interval(years) Duration II II II I II II II 11 1 2 5 10 25 50 1D0 200 500 II 1000 3.04 3.67 4.70 5.55 6.83 7.92 9.13 10.5 12.5 142 24-trr (2.73-3.41) (3.30-4.12) (4.21-5.27) (4.96-6.21) (6.05-7.61) (6.98-8.81) (7.97-10.1) (9.04-11.6) (10.6-13.8) (11.9-15.7) U.S.Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 2:Runoff Curve Number and Runoff Project: Springhill Village _ Designed By:FGM,PE Date: 6/10/2019 Location: TMP 09000-00-00-02800 Checked By:SRC,PE Date: 6/10/2019 Check One: Present X Developed X 1.Runoff curve Number(CN) Cover description I I CN(weighted)= Drainage Area Soil name and hydrologic Area Product of CN Calculated'S' (Cover type,treatment,and hydrologic condition;percent CN total product/ Description group(Appendix A) (Acres) x Area Value impervious;unconnected/connected impervious area ratio) total area DA A Impervious Areas 98 1.20 117.7 (Present) B Wooded Areas in Good Condition(25%+/-) 55 5.39 296.5 62 6.23 Grass/Lawns in Good Condition(2/3rd+/-) 61 13.04 795.4 DA B Impervious Areas 98 3.82 374.7 B Woods in Good Condition 55 1.67 91.9 72.2 3.85 (Present) _Lawns in Good Condition(75%+Groundcover) 61 6.23 379.8 Impervious Areas 98 7.31 716.6 DA A B Woods in Good Condition 55 1.10 60.5 75 3.37 (Developed) _Lawns in Good Condition(75%+Groundcover) 61 10.69 651.9 DA B Impervious Areas 98 4.10 402.3 (Developed) B Woods in Good Condition 55 1.67 91.9 72.6 3.78 Lawns in Good Condition(75%+Groundcover) 61 6.48 395.0 2.Runoff 1-Year Storm 2-Year Storm 10-Year Storm Drainage Area Description Frequency-years _ 1 2 10 n/a Rainfall,P(24 hour)-inches 3.04 3.67 5.55 n/a Runoff,Q-inches 0.40 0.68 1.76 DA A(Present) Runoff,Q-inches 0.84 1.25 2.65 DA B(Present) Runoff,Q-inches 0.98 1.41 2.89 DA A(Developed) Runoff,Q-inches 0.86 1.27 2.68 DAB(Developed) ..!'., .;• .'a • .I.i{.. ;Yf•.. , U.S. Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 3:Time of Concentration (Ta)or Travel Time(Tx) Project: Springhill Village Designed By: FGM, PE Date: 6/10/2019 Location: TMP 09000-00-00-02800 Checked By: SRC,PE Date: 6/10/2019 Check One: Present X Developed X Check One: Tc X TL Through subarea n/a DA A DAB DA A DA B Segment ID: (Present) (Present) (Developed) (Developed) Sheet Flow:(Applicable to T,only) 1 Surface description (Table 3-1) Dense Grass Dense Grass 2 Manning's roughness coeff.,n(Table 3-1 0.24 0.24 3 Flow length, L(total L<100)(ft) 100 100 4 Two-year 24-hour rainfall,P2(in.) 3.7 3.7 5 Land slope,s(ft/ft) 0.13 0.13 6 Compute T.=[0.007(n*L)°'8]/p20.5 z.5 s0.4 0.11 0.11 Shallow Concentrated Flow: 7 Surface description (paved or unpaved) Unpaved Unpaved 8 Flow Length, L(ft) 1,150 350 9 Watercourse slope,s(ft/ft) 0.064 0.120 10 Average velocity,V(Figure 3-1)(ft/s) 4.1 5.5 11 Tt=L/3600*V 0.08 0.02 Channel Flow: 12 Cross sectional flow area,a(ft2) .c o c a — - v 2 c v o c m o ° o v m o 13 Wetted perimeter, P,,(ft) > a, + o •� �- fl- > a, . co •E 0 m o- O c = 0 14 Hydraulic radius,r=a/PW(ft) c c c > CU c a m 15 Channel Slope,s(ft/ft) cu E 8 a - �; .E 8 a 16 Manning's Roughness Coeff, n o 0 o s •X 4- o 0 0 0 X U L °) a-+ UJ 0 t--I U t- a) 4-' I.IA 17 V=[1.49r213s°'5]/n a E: E o a E E • 18 Flow length, L(ft) a ~ o o a ~ o 19 Tt=L/3600*V 0.01 20 Watershed or subarea Tc or TT (Add Tt in steps 6, 11 and 19) 0.19 0.50 0.14 0.50 U.S.Department of Agriculture Natural Resources Conservation Service TR 55 Worksheet 4:Graphical Peak Discharge Method Project: Springhill Village Designed By: FGM,PE Date: 6/10/2019 Location: TMP 09000-00-00-02800 Checked By: SRC,PE Date: 6/10/2019 Check One: Present: X ,Developed X Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area 1.Data '-I °• Description Description Description Description Description DAA DAB DAA DAB (Present) (Present) (Developed) (Developed) Drainage Area(Am)in miles2= 0.0307 0.0183 0.0298 0.0191 Runoff curve number CN= 62 72.2 75 72.6 Time of concentration(Tc)= 0.19 0.50 0.14 0.50 Rainfall distribution type= II II II II Pond and swamp areas spread 0 0 0 0 throughout the watershed= 2.Frequency-years 1 2 10 1 2 10 1 2 10 1 2 10 3.Rainfall,P(24 hour)-inches 3.04 3.67 5.55 3.04 3.67 5.55 3.04 3.67 5.55 3.04 3.67 5.55 4.Initial Abstraction,la-inches 1.25 1.25 1.25 0.77 0.77 0.77 0.67 0.67 0.67 0.76 0.76 0.76 5.Compute la/P 0.41 0.34 0.22 0.25 0.21 0.14 0.22 0.18 0.12 0.25 0.21 0.14 6.Unit peak discharge,Qu-csm/in 575 675 775 450 475 500 850 875 900 450 475 500 7.Runoff,Q from Worksheet 2-inches 0.40 0.68 1.76 0.84 1.25 2.65 0.98 1.41 2.89 0.86 1.27 2.68 8.Pond and Swamp adjustment factor,Fp 1 1 1 1 1 1 1 1 1 1 1 1 9.Peak Discharge,Qp-cfs Routed Through The where Qp=Qu Am Q Fp 7.07 14.06 41.80 6.94 10.84 24.25 SWM Facility 7.41 11.54 25.66 WATERSHED SUMMARY Channel&Flood Protection Analysis Pre-Development Post-Development 1-year Flow, 10-year Flow, 1-year Flow, 2-year Flow, 10-year Flow, CN Area,ac. cfs 2-year Flow,cfs cfs CN Area,ac. cfs cfs cfs DAA 62 19.63 7.07 14.06 41.80 75 19.10 2.34 12.60 39.91 Existing Culvert Replacment Capacity Analysis Pre-Development Post-Development CN Area,ac. 1-year Flow, 2-year Flow,cfs 10-year Flow, CN Area,ac. 1-year Flow, 2-year Flow, 10-year Flow, DAA 62 19.63 7.07 14.06 41.80 75 19.10 2.34 12.60 39.91 DAB 72 11.72 6.94 10.84 24.25 73 12.25 7.41 11.54 25.66 31.35 14.02 24.90 66.06 31.35 9.75 24.14 65.57 Proposed Underground Detention System Routings and Channel and Flood Protection Calculations Springhill Village- SWM Detention Facility5 BasinFlow printout INPUT: Basin: Springhill Village- SWM Detention Facility 0 Contour Areas Elevation(ft) Area(sf) Computed Vol. (cy) 1 Storage Pipes Storage pipe 0 name: Detention Pipe diameter (in) 120.000 length (ft) 892.000 invert (ft) 525.500 angle 0.287 volume (cy) 2594.723 Start_Elevation(ft) 525.50 Vol. (cy) 0.00 6 Outlet Structures Outlet structure 0 Orifice name: Primary Outfall Pipe area (sf) 1.227 diameter or depth (in) 15.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 525.470 multiple 1 discharge out of riser Outlet structure 1 Orifice name: Low-Flow Orifice in Weir Plate area (sf) 0.110 diameter or depth (in) 4.500 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 525.500 multiple 1 discharge into riser Page 1 Springhill Village- SWM Detention Facility5 Outlet structure 2 Orifice name: Mid-Flow Orifices in Weir Plate area (sf) 0.545 diameter or depth (in) 10.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 532.050 multiple 6 discharge into riser Outlet structure 3 Orifice name: Emergeny Spillway Overflow- Weir Plate area (sf) 1.471 diameter or depth (in) 16.420 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 535.000 multiple 1 discharge into riser Outlet structure 4 Weir name: Access MH near Weir Plate diameter (in) 48.000 side angle 0.000 coefficient 3.300 invert (ft) 541.000 multiple 1 discharge into riser transition at (ft) 1.215 orifice coef. 0.500 orifice area (sf) 12.566 Outlet structure 5 Weir name: Emergency Outfall Pipe diameter (in) 18.000 side angle 0.000 coefficient 3.000 invert (ft) 534.000 multiple 1 discharge out of riser Page 2 Springhill Village- SWM Detention Facility5 3 Inflow Hydrographs Hydrograph 0 SCS name: 1-yr. 24-yr Peak SCS Method Design Storm Area (acres) 19.100 CN 75.000 Type 2 rainfall, P (in) 3.040 time of conc. (hrs) 0.1400 time increment (hrs) 0.0200 time limit (hrs) 36.000 fudge factor 1.00 routed true peak flow (cfs) 22.394 peak time (hrs) 11.935 volume (cy) 2532.213 Hydrograph 1 SCS name: 2-yr. 24-yr Peak SCS Method Design Storm Area (acres) 19.100 CN 75.000 Type 2 rainfall, P (in) 3.670 time of conc. (hrs) 0.1400 time increment (hrs) 0.0200 time limit (hrs) 36.000 fudge factor 1.00 routed true peak flow (cfs) 32.296 peak time (hrs) 11.935 volume (cy) 3651.842 Hydrograph 2 SCS name: 10-yr. 24-yr Peak SCS Method Design Storm Area (acres) 19.100 CN 75.000 Type 2 rainfall, P (in) 5.550 time of conc. (hrs) 0.1400 time increment (hrs) 0.0200 time limit (hrs) 36.000 fudge factor 1.00 routed true peak flow (cfs) 65.848 peak time (hrs) 11.935 volume (cy) 7445.630 Page 3 Springhill Village- SWM Detention Facility5 OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1-yr. 24-yr Peak SCS Method Design Storm inflow (cfs) 22.298 at 11.94 (hrs) discharge (cfs) 2.342 at 12.38 (hrs) water level (ft) 532.256 at 12.38 (hrs) storage (cy) 1144.796 Hydrograph 1 Routing Summary of Peaks: 2-yr. 24-yr Peak SCS Method Design Storm inflow (cfs) 32.157 at 11.94 (hrs) discharge (cfs) 12.596 at 12.10 (hrs) water level (ft) 533.218 at 12.10 (hrs) storage (cy) 1451.361 Hydrograph 2 Routing Summary of Peaks: 10-yr. 24-yr Peak SCS Method Design Storm inflow (cfs) 65.565 at 11.94 (hrs) discharge (cfs) 39.914 at 12.06 (hrs) water level (ft) 537.696 at 12.06 (hrs) storage (cy) 2502.176 Wed Jul 03 09:04:43 EDT 2019 Y+r' 1 Ir1 . �; ; i Page 4 9 VAC 25-870-66 Section B:Channel Protection "Concentrated stormwater flow shall be released into a stormwater conveyance system and shall meet the criteria in subdivision 1,2 or 3 of this subsection..." Section B.1:Manmade stormwater conveyance systems "When stormwater from a development is discharged to a manmade stormwater conveyance system,following the land- disturbing activity,either..."a.or b.shall be met: Section B.1.b. "The peak discharge requirements for concentrated stormwater flow to natural stormwater conveyance systems in subdivision 3 of this subsection shall be met." Section B.3 "When stormwater from a development is discharged to a natural stormwater conveyance system,the maximum peak flow rate from the one-year 24-hour storm following the land-disturbing activity shall be calculated either..."a.or b." Section B.3.a. In accordance with the following methodology: Q Developed I.F.* (Q Pre-Developed* [RV Pre-Developed*A Pre-Developed])/(RV Developed*A Developed) Q Allowed 2.39 cfs Where: Q Pre-Developed= 7.07 cfs (From Worksheet 4 Watershed Summary,Flow) CN Pre-Developed= 62 (From Worksheet 4 Watershed Summary,CN) 5 Pre-Developed 6.23 (From SCS TR-55 eq.2-4) RV Pre-Developed 0.40 in. (From SCS TR-55 eq.2-3) A Pre-Developed= 19.63 ac. (From Worksheet 4 Watershed Summary,Area in acres) CN Post-Developed= 75 (From Worksheet 4 Watershed Summary,CN) S Post-Developed 3.37 (From SCS TR-55 eq.2-4) RV Post-Developed= 0.98 in. (From SCS TR-55 eq.2-3) A Developed= 19.10 ac. (From Worksheet 4 Watershed Summary,Area in acres) I.F.= 0.80 (Factor of Safety) Q Developed< 2.34 cfs Section B.4 Limits of Analysis The analysis terminates at subareas A&B since subdivision 3 is met. Energy Balance Calculation Notes: 1.The RV values in the energy balance calculation are in watershed inches,typically listed only as inches.This is essentially a measurement of runoff per some unit of the drainage area.When drainage areas are not identical in the pre-and post-development states though,as is the case in this project,then the energy balance requires factoring in the ratio of the pre-development /post-development areas. Please also note,the difference in the pre-and post- development subareas is minor with them matching 97%. 2. Energy balance calculation note#1 listed above is consistent with item#2 of Attachment 1 from the DEQ SWM training document dated April 2016.This document refers to the VRRM spreadsheet's runoff volume calculation.The ratio factoring in the difference in pre-and post-development drainage areas is comprehensive and ensures compliance with channel protection requirements. 9 VAC 25-870-66 Section C: Flood Protection "Concentrated stormwater flow shall be released into a stormwater conveyance system and shall meet one of the following criteria as demonstrated by use of acceptable hydrologic and hydraulic methodologies:" Section C.2.b.: The point of discharge "releases a postdevelopment peak flow rate for the 10-year 24-hour storm event that is less than the predevelopment peak flow rate from the 10-year 24-hour storm event. Downstream stormwater conveyance systems do not require any additional analysis to show compliance with flood protection criteria if this option is utilized." Section C.3 Limits of Analysis The analysis terminates at subareas A& B since subsection C.2.b is met. Proposed Outlet Protection and Dry Swale Calculations Quito- Towerio,k) 'DA "i?Ea, RLANT21. N-1, "OINAGLNc7g,t ‘)OVE 3t -14t ,z LA= 14' J, w Lp,a 0 (t.wi R.kgot4J4 \MIT at Ai A t)p.ovockl-oCcevit 'Vaeswes---0)-J. To WC, VcAlla Q 7. ci;g:4\-0 .' v49-4-k FAI3R44, \e.„5". co 1c. fokki\u— cE44---,g.i.AR 4\ PA11/4 Ok.. CV • cn ,..-8 0 v0 DESIGN OF OUTLET.PROTECTION FROM A ROUND PIPE FLOWING FULL 120 : • - •• - t\) o , MAXIMUM TAILWATER CONDITION ( T 0.5 DIAMETER) -.. _. w— • ,, , ,• : :•: i ., ir.fill;1 ... ._- , r. . : , , , : „!, , :,. .: ,, • • . • . _ no ,• .....„.. „ , .i, i . 1,11 ril. ; -, iTil 30 • '• '' H ,Il 1 1 ;11.11.:'11 Iri .. rill1111111 1 ‘---------T• ,,. .il ill --is ':.j. • :. Outlet 100.., Do + 0.4La !1,,1101111111 1 i irri,,,fit.i.,,,,,,,,i0,,,,,,,,,1„,,,,,,,,,,, Diameter:, Do ( —... 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'Tfrke- 131'.?-1-‘-:N C:' '--)C•,-.5:161\1•00 Q t.:121,C1:1-,1 ES A gE.- 54 Ww f .0 "11--kki.A“ca-43 Dry Swale No. 1- 10 yr. Freeboard Check Complex Channnel- Dry Swale #1 Depth of Flow Check Input: Slope 0.010 Flow (given) 1.311 line x y n 0 0.000 1.000 0.030 (first n value not used) 1 3.000 0.000 0.030 2 12.000 0.000 0.030 3 15.000 1.000 0.030 Output: Depth 0.119 (y) ( 0.119) Channel bed segment output: line Q V A P 1 0.02 0.73 0.02 0.38 2 1.28 1.20 1.07 9.00 3 0.02 0.73 0.02 0.38 Tue Jul 09 13:56:28 EDT 2019 Page 1 Dry Swale No. 2- 10 yr. Freeboard Check Complex Channnel- Dry Swale #2 Depth of Flow Check Input: Slope 0.010 Flow (given) 10.250 line x y n 0 0.000 2.000 0.030 (first n value not used) 1 6.000 0.000 0.030 2 21.000 0.000 0.030 3 27.000 2.000 0.030 Output: Depth 0.298 (Y) ( 0.298) Channel bed segment output: line Q V A P 1 0.18 1.34 0.13 0.94 2 9.89 2.21 4.47 15.00 3 0.18 1.34 0.13 0.94 Tue Jul 09 13:55:50 EDT 2019 Page 1 Dry Swale No. 3- 10 yr. Freeboard Check Complex Channnel- Dry Swale #3 Depth of Flow Check Input: Slope 0.010 Flow (given) 5.581 line x y n 0 0.000 2.000 0.030 (first n value not used) 1 6.000 0.000 0.030 2 26.000 0.000 0.030 3 32.000 2.000 0.030 Output: Depth 0.176 (y) ( 0.176) Channel bed segment output: line Q V A P 1 0.04 0.95 0.05 0.56 2 5.49 1.56 3.53 20.00 3 0.04 0.95 0.05 0.56 Tue Jul 09 14:00:50 EDT 2019 Page 1 Storm Sewer Calculations for the Underground Detention System Outfall Table 8:Pipe Design Table PIPE DESIGN n=0.013 for RCP n=0.01 for HDPE Pipe Hydrology Pipe ` d ` 1 ? 1m U tE w Z` c m o § 1d n 2 .. o u 3 g m E ( Fin, m E m `5 = c c d _ I C� y. E ' o iu @ " E c° m o > o E o.IA 0Li. o 1N W Q!? U U U F- - O S - - c o O li j u_ Pipe run:106-OUT 106 104 19.10 0.60 _ 11.460 11.460 720.00 0.38 39.91 39.91 523.97 523.19 116.8 0.013 0.0067 _ 36 54.59 8.41 0.23 104 102 0.23 0.90 0.207 11.667 5.00 6.67 41.29 41.29 523.09 522.24 126.8 0.013 0.0067 36 54.59 8.45 0.25 102 OUT 0.24 0.90 0.216 11.883 5.00 6.67 65.57 65.57 522.14 521.71 64.4 0.013 0.0067 42 82.35 9.49 0.11 Hydraulic Grade Line Calculation Design Year: 10 Project: Springhill Job#: 182157 Prepared by: FGM,PE INLET OUTLET WATER L, O. Q. Sr Hr JUNCTION LOSS FINAL INLET WATER RIM STATION SURFACEELEV ZW V. He QIN VIN Q,'V, VZ/2g H. ANGLE HA H f I3I{ .SH, H SURFACEELEV ELEV 524.51 64.39 42 65.57 0.004 0.27 9.5 0.3 102 41.3 8.5 349 1.1 0.39 0 0 0.74 0.96 0.48 0.75 525.26 529.20 525.26 126.75 36 41.29 0.004 0.49 8.5 0.3 104 39.9 8.4 336 1.1 0.38 85 0.72543 1.39 1.80 0.90 1.39 526.65 532.16 526.65 116.83 36 39.91 0.004 0.42 8.4 0.3 106 0.00 169 0 0.27 0.36 0.18 0.60 527.25 535.50 Hydraulic Grade Line Page 1 • DRAINAGE DESCRIPTIONS STR. PIPE INFORMATION INLET INFORMATION NO. DIA. LENGTH SLOPE INVERT INVERT MATERIAL INLET TYPE Curb SLOT RIM COMMENTS (in.) (ft.) (%) IN OUT Type LENGTH ELEVATION 106 MODIFIED MH-1 - - 535.50 VDOT STD.IS-1 REQ'D 105 36 116.83 0.67% 523.97 523.19 RCP3 104 DI-3B CG-6 6' 532.16 VDOT STD.IS-1 REQ'D 103 36 126.75 0.67% 523.09 522.24 RCP3 102 DI-3B CG-6 6' 529.20 VDOT STD.IS-1 REQ'D 101 42 64.39 0.67% 522.14 521.71 RCP3 Virginia Runoff Reduction Method Water Quality Calculations (COMPLIANCE IS MET THROUGH TWO BMPs.THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS&THE INSTALLATION OF THREE LEVEL II DRY SWALES ARE PROPOSED.) DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet-Version 3.0 ,02011BMP Standards and Specifications .[a 2013 Draft BMP Standards and Spedrica6ons Project Name: Springhill Village VSMP Plan CLEAR ALL data Input calls Date: 7/10/2019 constant values BMP Design Specifications List:2013 Draft Stds&Specs calculation cells Site Information final results Post-Development Project(Treatment Volume and Loads) Land Cover(acres) A Solis 85oils CSolls DSolls Totals Forest/Open Space(acres)-undisturbed, 0.00 protected forest/open space or reforested land Managed Turf(acres)-disturbed,graded for yards or other turf to be mowed/managed 8.13 8.13 Impervious Cover(acres) 719 ,7.19 15.32 Constants Runoff Coefficients(Re) Annual Rainfall(Inches) 43 A Soils 85olis C Soils DSails (Target Rainfall Event(Inches) 1.00 Forest/Open Space 0.02 0.03 0.00 0.05 (Total Phosphorus(TP)EMC(mg/L) 0.26 _ Managed Turf 0.15 020 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(ib/acre/yr) 0.41 PI lunidess correction factor) 0.90 i Post-Development Requirement for Site Area TP Load Reduction Required(Ib/yr) 13.01 LAND COVER SUMMARY--POST DEVELOPMENT Land Cover Summary Treatment Volume and Nutrient Loads Treatment Volume Forest/Open Space Cover(acres) 0.00 (acre-ft) 0.7047 Weighted no(forest) 0.00 Treatment Volume(cubic feet) 30,697 %Forest 0% TP Load(Ib/yr) 19.29 Managed Turf Cover(acres) 8.13 TN load(lb yr) 137.98 Informational Pu•oses OM Weighted Rv(turf) 0.20 %Managed Turf 53% Impervious Cover(acres) 7.19 Rv(impervious) 0.95 %Impervious 47% Site Area(acres) 15.32 m04Heim_Et.0a Drainage Area A DraMaga Area A Land Over(acres) ASMs ¢Saba CbOs 0Sp0 a a lard Own Rv ' rornyopen sea ten) 0m am Monaco Tutlaun) 034 034 030 • M,pemmaraaerloe,) O. 0OS O95 Taus PimspM1mua Available far Removal In D.A.A(W/lp) 026 Total 039 Post Developm of Treatment Volume.DAA(ft7 633 Stormwater Best Management Practices(RR=Runoff Reduction) -Select from dr0pdmen PM- Phosphorus Untreated Ronc. Managed T0H ...do. Volume from R Dent.. Tr. P5030roa Poophdny Remmmng Nitrogen Nwomn bad Untreated Nitrogen Remalmng utwll Wtllrom PM1nDlwroa DownvMam PraNce Wbe Pretllo¢ Reduabn Cr..Area Cover Crack Upstream Redutlbn(h,. Runafl Treatment ;lemma( Upsbeam LmtlW Removed By pMsphoroa DnPWYtd Removal ',or...am Nitrogen Wad t°Removed By Nitrogen Wad Gedit(M) (aces) Area(aaes) Pr..ut} Volume(N7 V01ame De) ....MOO PraMcesW PMmlte. P..W(W) Wad(IS) Efficiency(%) Makes DM) Pra<Dae(Ibl) (Imam PM) (0N1 1.Deputed R00f lon) La. MO as Dpet.sl .s t Vega.. a 0 a a MU aW am OM a SHINMI om nm m0 z6 Wm..RminlSoetml m an a 0 a 03111111I nW nm om oMIIMnW CLOG om . top WFtonne lion(RAI z.Simple onto...IN e015Pm NI) 0 0 0 o D nm Om to. Gm o nm Om o.m aW 20 Hmpl co VD MEI ' Disconnection ���" 2s o O o a 0 OM GOO nm o.W a am OW OW 000 (misti e/0erm mail m a 0 l 0 a 0 0m Am am 0m a MOO nW to Um l v,m D•or wen m FrtM...I riewnwinfention el Deem, 50 0 0 o a is 0.03 003 0.00 nm 15 aW 403 am 040 TA to Div Want Fwd... 55.-Infilust.al(Met. 0 0 0 a u aW 0.W am Om is nW MOO am Om coat _ rza.z lspecnl w 0 0 a a ss am o,W nm ore m nm oW to am mwetaretentzmnlspec esl m 1.to NM Garden. D a 0 a m aW oW am .0 m am 0W nm ode 2n To Mow.e,gwvestm.0000 as 0 0 0 0 0 0 , aW to 0.00 0m a am to. to 000 Dorman.Plantar. 00 zsoD aW am am up am am to 0m0000 emrteo l mwpenenA e0 3. rmesble Pavement IRRI 3.permeable Pavement Ian) 34.Pema.easement alDmMI as 0 0 0 0 zs DW 040 0m nm © cm too EM 3.e.Pem,e.m Farementm Dem. m Mig 0 0 0 uSEMam 400 to ©:,';e- :1 to Om it.Grass channel(AR) a.Man Chaimeltas000lspete3l 20 0 0 0 0 ss am nm 0m 0m 20 cm to to 0m ot Grass Charm wsamispe.ml 10 0 0 0 0 D 0m 0.m to 0m 20 to am tm axon • .eper.p 1 spKmi mi s°" 20 0 0 0 0 is 4m 0m 0m 0m 2a nm 0m om 0m .Dry Swale IRRI 5.Dry Swale(Rill sa,Dry 5,.el lSP.M1 RO 0 0 0 o m om nm to 0.00 ©. om to =EWE SU Orc54 ea2Dpe<au0 m nN 4a5 0 MI aU ao tm coo OID aW © cm Lea ECIONEI ...retention DM) 6.glaretentton(RRI La'BioretraMn elm row lspetn"I�a'°r m 0 0 0 0 ss to 0m 0m om to to Urban It0I03te��ifpm.9'eamentlm,m m 0 0 0 0 m aW o.W om 0m a.W DW o.W nW T.Innluation Mel 2.inrluranon(eD) Ta I,etalc elDem ea) m 0 0 0 0 ss 0.00 nW 0.00 0W © to to m Id.mmuwnm(SPctm) m 0 0 0 0 ss 0.00 aW Om 0.03 © nm cm m Extended Detention Pond(RP) a.Emended Detention Pond MR) L.Eoal(Spec.. 0 0 0 0 0 M nm nm atu 000 ME nm 0m nm .EOF215p«a051 M 0 0 0 0 Lb u 4m OW 0.m 0.m Om Om nm 0.W ..ShesNlow to Filter/Open Spate IRS) 9.Sheetllow to FlRer/Op0n Spate(OR) 9.00mtllw Arta NBS400 nm nW ®� to m 0 0 0 0 0 nW 0.m nm OM INCIII 9e.v.ema.M ArtawsmF nm nm m DPetm m 0 0 a o 0 nm nm am om to mm 0 Yee .. sama�or m a a 0 0 0 Om nm 4m to MI 0m om rem to L Fog TOTAL IMPERVIOUS DOM TREATED lac) Dos AREA CHUM oil. TOTAL MANAGED TURF AREA MATED(ac) aid _A.A...oil. TOTAL RUNOFF REDUCTION IN DA A(le) 252 TOTAL PHOSPHORUS AVAllAOIE FOR REMOVAL IN DA A(Ib/yr) Olt TOTAL PHOSPHORU5RFM0VFO WITH RUNOFF aroucnON PRACTICES IN OA A(Ib/wl 0.20 TOTAL RUNOFF REDUCTION IN DA A(ftt) 353 TOTAL PHOSPHORUS RFMNNING OFFER APPLYING RUNOFF RmUCITON PRACTICES IN OA A(W/m) 0.06 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES INOA A(Ib/yr) 139 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALNUFTIONS SEE WATER QUAUTYCOMPLIANCE TAB FOR SITE[MEDIATIONS On!carnation Only) W0.0 y1_60.00D 10.Wet Swale(n0 RR) low Wet Swale(Coastal PUN)(no RR) 10.e.Wet Swale RI 15peall) 0 0 0 0 0 00 0.00 0A MOOf 000 0A 00 =EWE 10 x Wee HnIeW(p.a111 0 0 0 0 0 e0 OW 0m o oo Om M. nA OW IL FillelinE PratliteS 1.0 RR) IL F0lerin1 Practices(no RR) 11e Filtennpraukea1 Daae1LO( 0 0 0 0 0 60 000 000 0.00 OM • O00 000 IL 0FIReMLPI.cuv MY(Sew NMI 0 0 0 0 0 Rs 0.00 0A 0.00 000 © OA 000 ME 13.Constructed Wetland(no RRI M.Conswcled Wetland(n0 RRI 1la....auave w.1Isaac au) 0 0 0 0 0 s0 Om 000 OA 000 © om DA WZIME 111.0 aweww.dwalDaaca13) 0 0 0 0 0 75 0.00 OM 000 OM © 0A uA WE 13.Wel Ponds(no RR) me weuwed n Opt Wel 0 0 0 0 0 W OM oA GOO oo0 30 0Oa O 00, O00 po0 ub.WDPord al)muw Plela/Isptale) 0 0 0 0 0 u 000 000 0W 000 10 0.00 Mole OM 0OD 130we Pon142Upt424) 0 0 0 0 0 03 000 0.00 020 OM e0 0.00 000 000 000 US We Rend 1O Korn WAS(Keene) 0 0 0 0 0 es O00 000 000 0.00 00 OW OM OM 000 l MVWo..le Manulacturtd IMP(00 MI.. 0 0 O O 0 M DA .0000 0.00 Om 0m ME 1ea Mareact oad ire.Do.00oela00e 0 0 0 0 0 20 OW OA OM 0.00 M oW o00 MIZZI 1ee.NNaul.nured Hewn-wet oo0o 0mre 0 0 0 0 0 30 000 Om 0.00 OA .1111 0.w OA =MEM TOTAL IMPERVIOUS COVERS-REAM(ac) 0.05 AREA CHEM OK TOTAL MANAGED TURF AREA TREATED(ac) ON AREA CHECK OK TOTAL PHOSPHORUS REMOVAL REQUIRED ON sol(IL/00)1 13.01 TOTALPNOSPHORUSAVA1*000 FOR REMOVAL IN OA.A Ob/yr) 0.35 TOTAL PHOSPHORus REMOVED WITHOUT RUNOFF REDucxoN mamas ix DA.A(lb/yr) 0.10 TOTALPHOSPHD00S REMOVED Wm RUNOFF REDUCTION PRACTICES IN D A.A(Ib/M 0.20 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN DA.A(Ib/yrl 020 TOTAL PHOSPHORUS REMAINING AFTER APPLYING IMP LOAD REDUCTIONS IN MA.A(Ib/yr) 0.06 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NR0OGEN REMOVED W1111 RUNOFF REDUCTION PRACTICES IN D.A.A)0/M 1.39 N0NOG0N REMOVEDWIOIOUT RUNOFF 000000ON mamas IN D.A.A(@/01) 0.00 TOTAL NITROGEN REMOVED IN DAA(Ib/01) 1.39 vaRaliSaLT,Aprinerl Drainage Area B Drawge Area A um Cover(acres) Alms 0Sena Cmns nsena Totals Land Forest/Open Spam(weal 000 0.00 Managed Turf laws) 1.54 Ls4 0.20 bnpervion Cover(acres) 1.01 101 0.05 Total Phosphorus Available for Removal In DAB Wiwi 189 Total 155 Post 0nebpment Treatment Volume In DA B WI 4,601 Stormwater Best Management Practices(RR=Runoff Reduction) -Select from drepdownRsb- Plesph0rus Untreatetl 0.umio Managed ea ImpeMes VUumeam R Ren0050 TreatBMP Phosphorus RemovPROSpheed d RenpNNg Halogen MAOgpnrea Ugen L40 Removed RemeinLoa utwff tllram phosphorus Down.SbEmploy sticembe lny PlactiG! CreWttbn Cr(moe.)a Cover Credit Upstream ... Treatment Removal rIc"*"L)y Phosphorus Removal ter,( Irate Upstream XltmeWe(I1 to...Le H.)NNo(us) uedkl%1 laaal Area lamest vramce(It.)ReauDbn lrt'I Volume lrt'1 vpbme(k'1 Emaen<yl%1 p ptbes b vColc Cob vractbe llbl ]oad lie) Employed Emdercyl%) Practices llbsl Pram<e llxl ...Le ptsl (MA I.Vegetated Roof(RR) y M ntt 1.a.Vegetated Roof al(SR'S) os t.k`F0~. A 0 0 0 0 >' O00 Am nm 0 t `+ Om ow om 1 Is Vegetated Rootn(Speen) 60 E*'T''t a 0 0 0 0 02.e-s :. am Om 0m 0 nm 0m 0m h M_. oolm00lsconne4110n(RR) z a,R v t0/9SO0s m�PK,�1" s0 F o 0 0 I 0 000Om 4, 000 0 0.m 000 am nm L2.Sb5wu Dm,mew nto ws4N - (Wes MI a. 0 0 0 n 0 Am nm D.m o.m O am Am 0m 2.c.To sea Amended r 1/09 as per speaks/Ions ledsWa C/0emns)02.04l m D 0 0 0 o OW D.m OW Om • o o.m 0.m am 0.m 20 TO We FOrench Oran M. .. . n Oyes MI D 0 0 25 O.m Om 0.m am 15 O.m Om nm Om lie my wen Or French pain OR na315vecaBl 0 D 00 35 O.m am O.m Om IS am nm Om Dm yl.To n Ge vi l(Speenl - O 0 0 D 35 Om 0.m nm om m Om Am Om 000 i ' Mlmoebrtten00ne na]Opece9l 0 0 0 0 m v.m Om Om 4m 00 Om Om OW 4m RAW Wswater Hawesens(Spece6) 0 _ 0 D 0 0 0 Om am om - Om 0 am Om Om um urban Gowen/Ion lspecn,appenanal ao 0 0 o a ss Om o.m am 0. m 0.m Om OW am 3.Permeable Pavement(RR) 3.,Permeable Pavement(RR) 3 a Permeable Pavement PI(Specall as - 0 0 0 0 35 003 . 000 000 Om © nm OM 0.00 3b Pemteable Pavementv3(Spec PH TS .i.r_ti+:' 0 0 0 35 ,,'','/'<:, Om 003 000 ® Gm 0m Gm .Grass Channel(RR) 4 a GrassumnneWe was Olsec all 30 0 0 0 IS 0m 000 000 Om. zu O.m Om Gm Dm 4 2.Cress Channel Cry soils lspm ell 10 0 o 0. 0 ss 0 00 n Dm Om 000 20 OW O.m MOO am 4e Grua Gunnel peye ed dxa 3D as per specs(see o 0 0 0 IS D.m OW om qm 20 O.m am ' ,O.m Am .Dry Swale(PH) 5.Dry Swale(RR) S.a CoSwale 411SPeWIM 40 0 0 0 0 m0 00 Om 0.00 Om ® 0.m D.m S b.Do Svdea](Spec a10( 60 154 1.01 0 2.701 LAM 4,001 a0 0.00 lag ].ss 0.69 ® qm mb0 leal® .,eloretention(RR) 6.bmretentian(RR) 6iB e,Wes nl0°nne a D D 0 ' o u am OW am Om a III Om 4e.04010,tbbHemv91 ra or neretennena3 M D 0 0 0 m OW WM n0D Dm m L Intil0raWn HMI T.bintratlon(RR) T a.mmmtw5PI Wes aq 50 0 0 D 0 IS 0m 0.00 000 000 ® , III WE Pb.. MR/raton P](Speenn) m 0 0 0 I is O.m DM Om 000 MEE am 000 am R.Extended Detention Pond(RR) R.Extended Detention Pond IRR7 Ra,EO al(Spea MS) 0 I O 0 0 ss OM Om Um Om MEI III Om 0.00 OW 0 b.ED 6I(I56c415) 10 0 0 0 0 1S 0.00 000 G00 nm 10 Om D00 III 'e Sheetllow to Flher/Open Spate(RR) '..Sh.H1Dw to Filter/Open Space(WI 9a5100mw art0A/B SON to Conserve/On so 0 0 0 0 o Om Om 0.m Om o 0.m O.m Om 0.m 9 A Meatlbr Area,CJOs01b 1O conserve/Ion nl s0 0 0 0 0 0 O.m Dm Om Om 0 O.m om qW 4m 9e Slmedlove Compost ded4/UOSO0ACrNO SO0 0 0 0 0 0m 000 COm OW 0m 0 Om 0 0m 0ISPeca21240 TOTAL IMPERVIOUS COVER TREATED lac) 1,01 AREA CHECK:OIL TOTAL MANAGED TURF AREA TREATED(MI 1,54 AREA CHECK OIL TOTAL RUNOFF REDUCTION IN on DM') 1,761 TOTAL PHOSPHORUS AV/VIABLE FOR REMOVAL IN o.A BID/yrl 1.69 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN OA a(10/yr) 1.19 TOTAL RUNOFF REDUCTION IN ILA 9(he) 1,761 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN OA B Mir) 070 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN DA BIIb/yrl 15.19 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS SEE WATER QUAINT COMPLIANCE TAB FOR SITE CALCULATIONS(Information Only) vRRI6,67,77.3.3 10.Wet'Swa e,.PRI iB Wet l,0le(Coastal P14116(ORFR) 10e.we1Fmle41(Spec KID 0 0 0 0 0 20 e.m 0m ODD 0m © am am 0 10WWetseale 12(3peens( 0 _ 0 e 0 0 40 000 0.00 000 MIe.m 0m 00 11.Filtering Praaloes Ina RR) .'Merin,Practices Ino RR) 11.0terinp,000.nDpernMl 0 0 e 0 0 m 0m 0m e.m nm p em oaa WE0 ssnrOte,O®erecvice nl0004.4 0 e D 0 D RI 000 0.m 0.m 0 0.m em 11:110 12.Constructed Wetland Im RRI IE.CO....Wetland I.MD 126.vmw003 W.0 nenDper 0131 0 0 0 0 0 50 0.00000 Om om ME am "a I2.6.CommrtedWewbnllper413) 0 0 0 0 0 70 000 O.m Om 000 ® "a0.m ME 13.Wet Ponds(nu RR) 15.4 Wet Pmdn DpeenO 0 0 0 o e m om om Om Om m Om Om 0.000.00 san Wet Pond n(u 00IPOAl000040O 0 0 0 0 o as Om Om Om Om 30 om Om OW E,.�wet Pone.Doer nal O o o O O ys 000 om 0.000.m 40 WO om MOO Om sae Wet labnlCoanel000(lsarnq 0 0 0 0 o Bs om O. Om o.m m 000 Om om am 10.Manufactured Treatment Devices I.RR/ W.Manufactured MP Ino RRI la.e Mane...em0 4M 00 oeNu 0 0 0 0 0 20 0.m 0.00 0.m 0m MEI 0.00 . 0m =Mm lA.i MameacvetlTmtment OeNxTONmq 0 0 0 0 0 20 O.m nm Om Om ME Om Om 14 0 MancfwOed Treatment00W0'0erew 0 0 0 0 0 20 0m am 0.W 0m a 0m 0.m m TOTAL IMPERVIOUS COVER TRFATFO OD 1.01 TOTAL MANAGED TURF AREA TREATED(ae) 1.5e AREA CHECK:OK TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE VIVA I 03.01 TOTAL PHOSPHORUS AVAIIABIE FOR REMOVAL IN D.A.a(Ib/w) 269 TOTAL PHOSPHORUS REMOVED...MUT RUNOFF REDUCTION PRACTICES IN DA B(Ib/yr) 0.00 TOTAL PHOSPHORUS PRACTCES IN DAB(10/w) 2.19 REDUCTIONTOTAL PHOSPHORUS ACHIEVED IN DA.0(I1/yrl 1.19 TOTAL PHOSPHORUS REMAINING armAPPLYING LOAD TOAD REDUCTIONS IN OA 0(16/wl 0.70 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A.B(IL),,) 1509 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN A B(1b/yr) 0.00 TOTAL NITROGEN REMOVED IN D.A.B(Ib/Tr) 15.29 Drainage Area C Drabuge Area Ala.,wee,Pn) Asap. OS. CUM DS.. Totals laroMovefRe Foress/Open Seam IsemO OM am Managed Turf hoof 042 0.41 a1O Impentam Cmer(aoes) 0.69 0.69 0.95 Total Phosphorus Ava0able for Removal N DJ/C(e/n,) 1.69 Total 1.11 Post Development Treatment volume In D.ae(n'1 x604 Stormwater Best Management Practices(RR=Runoff Reduction) -MOM Irom dropdown Rsa- vnmplenS UOemeed Runoff Managed TUH impervious Volume from Re aselS TonIBMP Phosphorus Phosphorus Remaln,a Nitrogen Nlerogen bad Unrested L04 Halogen 0.em•Iniry Practice Reduction Credit Area Cover Creel% Upstream Runoll Runoff Treatment Romani bad irom Phmphorus Removed By Phosphorus Downstream Prattkebb Removal from Upstream Nitrogen load to Removed By Nitrogen Load sedltMI (aon) Area(noel Pmo%e(n')RedattlOnlll'I volume(to') Vplame(n7 Ettlrlency(mi pr. �badm Pmtace P%1 Wax(m) DIWed Emflen.gel Prattnn BM) PrateneilMl Prate.(a,) (MI ao%e ro u e 1.Vegetal.Root MR) LA Vegeta.Raul al Mecas) •S Ma a e a a EMI am am am a MEIN pm am am Let/meat.a,.nis0eeg51 m IMRE 0 0 a 0 ISM am Om Om 0 MIMI am am 0.m D.Rooftop Disconnect.,(RR) L>R Py°' «u. M.. tfnecall m m 0 a ° ° ° am ow OM nm O o.m 900 am am 3 b.s p01 Disconnection Sails ss O a o ° a OW am Om 9m 0 am OW am am1w. mm,v. o a ° 0 O Om am o D.m am am egg, teenrentna Arm..filter P.m per 0 m ° a ° a l5 a O 2.4..M�olmye0�mrF;M wM•L Dam WI Ca m am am ' O m D m 0.m am .To Dry. we FharroantAmOonrench Pa nch O 0 15p.an ° o a 15 om Om IS Om 0.00 am 0.m .1,Normeloretenrion�ama•s a a a a a as am am om Om . am 0.03am OM Ca rden WI m ° ° 0 0 m ate °m 9m °m m D.m °m am MO • Lam Rename Harvesting Orme06I D o D 0 0 0 om am am 003 ° OW 0 m am 003 • II,To Urban levee.nlspera.Karam 00 a 0 0 0 ss 9m °.m Om 0m a0 9m am am 000 1.Permeable Pavement(RRI 9.Permeable Pavement(RR) a A Pewee.pw•mrne alweem a 0 0 0 a ss am R. Om em am ©} am am nnabtP le Pe Pa,enMomnt al Mom aR U a o 0 l5 rr am am ©.Pit ;,.i am 111:3111:11 •.Graff Manna!(RR) •...Channel ND Smf Maw WI 1° O a0 ° u am am om Om m om nm am om •b......m.1.mils 1..31 1O a 0 o 0 M ace om 003 ORO m um am 9m Oat •.pMa one ComroftAmender.. to ° a ° o 75 °m Dm °m nm 10 D am °m D,m asverah(we Son aei .Drr swle(RR) S.Dry Swan(RRI s.Ow Samecapaam) ro 0 a O o 1D Om am am 0.m ® om am WM SO Drya.an le(S64 na) m as 0.69 a 1.611 1.974 lma •° am l.E. US am © am nm 111=® tenaon(RRI 6.eloratenthart(RR) Os.Noregenren III or Ohm mn lSo«f9l moat°. •0 a 0 0 0 05 om am Om am ME Om 0.03 ME am sb ammeemmn 1$pes./rcunemnai m 0 a 0 0 m o.m Om ME am em m am 7.Infiltration(RR) 9.Infiltration(RR) 7.1n1dtn°w It(Spec el) SO 0 0 0 0 15 am am am am Min O.m Om "a ITZEI 761nn0m0mr111l50Hm 90 0 0 0 0 15 am am am am © am am m R Extended Detentnn Pond(RR) IL Extended Uetentton Pond(as) as so al Down 5( 0 0 o a O 15 am om am am MEI am Om ROW allspec•15) as D D 0 O l5 am am OM Om 50 0.m Om am WM Sheenow to Near/Open Space MR) 9.Sheeltlow to Met/Open Spate(RR) 9asheemaw Area,Ams0N ME am a.m'°Lau��°" n o o ° D 0 090 om om OW 9nM,eedm a w ,aneln Me 0 am a mm ' Iwetal m O 0 ° O 0 am OW Om nm . Vega..Fm5S Strip. 9 am am En= Ca ro n.vied 0 saO, to a a 0 a a om am am am ill w II 6 TOTAL IMPERMOUS COVER TREATED(at) 0.69 AREA CHEM WC TOTAL MANAGED TURF AREA TREATED lac) 042 AREA CHM OIL TOTAL RUNOFF REDUCTION IN DA Ca I') 1,611 TOTAL PH05PHORUS AVAILAnlE FOR REMOVAL IN DA.C IRA/yr) 169 TOTAL PHOSPHORUS REMOVED wool RUNOFF REDUCTION Kamm IN D.A.t(Ib/yr) 1.28 TOTAL RUNOFF REDUCTION INUACPt) 1,611 TOTAL PHOSPHORUS REMAINING AFTER APPLYING WNW,REDUCTION PRACTICES IN eA C(Ib/yr) 061 NNROGEN REMOVED WITH RUNOFF(traumO(PRACICES IN DAeMAT) a91 SEE WATER DiUALUI COMPLIANCE TAB FOR SITE COMPLIANCE CALCUTAPONS SEE WATER 0UAUTTCOMPLIANCE TAB FOR SUE CALCULATIONS Onf rmonon Only) NOW)low_._00.00 10.Wet Swale(rw AR) WVdt Swale(CP3H010101M(no AP) 10K We 5..4.113oea.D aa( 0 . 0 0 0 0 10 0 000 0.00 Gm ©1D am Om ®® 100Wet5.3482(5.s0131 0 0 0 0 0 RO am ODO 003 000 © am O.m =MM. II.wteOnS Procl1ces fro Rill II.Filtering Practices(no 00) 11 @Alteringa0.0L.elcsa..111 0 0 0 0 0 60 ono 000 000 000 En 000 Gm =MEM 11 e.Mnengrt000002ISPee.00) 0 0 0 0 0 65 oa0 0m am om ® Om om W.Constructed Wetland Inc MO 11.Constructed Wetland N10 WO I1LeonaYNd Wed.l.ln(sPn NS) 0 0 0 0 0 SO 0.W Om um Om © Om Om MIME ILL 00000u0N WeV.Mn100es0t3) 0 0 0 0 0 75 003 a00 000 000 © Din am ME 13.Wet Ponds(no RRI DA.Wall,.al(50es ON 0 0 0 0 0 m OW OW O.m 000 30 OW Om 0W ON I3d Wet Pond.1Kau.P441150es350 0 0 0 0 0 45 003 0.00 0.m Om 20 060 O.m O.m 0m vc Wet Pmdn(5,0141 0 0 a a O 15 000 Om 000 Om 40 000 0 03 Om OW un.We Pond n(Couw PI.W I3oes330 0 0 0 0 0 00 0.00 000 am 0m 30 Om OM a ao td.Manulan MP ured A (no RAI laa.34anAondr ire naaws 0 0 0 O u 00 000 om OW am fl am Om m� I6.0.5R30u7YRwed in.en.nt Oe4F6310.dng 0 0 0 0 0 E0 0m .m 0m Om fl 0m Om m 100000ul.nned innmant0.006.06erk 0 0 0 0 0 20 000 00D 003 000 ME Oro Ow TOTAL IMPEBM0U5 COVER TREATED(aq_ 0.69 AREAOIEOI:OK TOTAL MANAGED TURF AREA TREAT.130 0.01 AREA MOO OK TOTAL PHOSPHORUS REMOVAL REQUIRED ON sus(Ib/TNI 0B.01 TOTALPH05PH0PUS AVAILABLE FOR REMOVAL IN OAC Ob/n) 1.60 TOT.wrogwortus REMOVED WITHOUT RUNOFF REDUrOON mom.IN D.A.c(m/Pr) 0.00 10.1.mow Howe itINI01110 WON it WOW REDUCTIONMCES INO.01.cpb/s,) 1.18 . TOTAL SPHORUS LOAD e PRA0Durn0N ACHIEVED IN OA.c 01Vwl 1.20 Tom,PNOso0DOUS REMAINING AFTER APPI0N6 MOP LOOT 8E0ULDONs IN oil.DWW1 001 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NNROGEN REMOVED WITH RUN0R 11E00010N PRACTICES IN OA C(Ib/9T) 891 NHROGEN REMOVED W1RIOUT RUNOFF REDUCTION PRACTICES IN DA C(Ib/Tr) 000 ram NOROGFN REMOVED IN DALIIO/Tr) 691 Site Results (Water Quality Compliance) Area Checks D.A.A D.A.B D.A.C D.A.D D.A.E AREA CHECK FOREST/OPEN SPACE(ac) 0.00 0.00 0.00 0.00 0.00 OK. 1 IMPERVIOUS COVER(ac) 0.05 1.01 0.69 0.00 0.00 OK. IMPERVIOUS COVER TREATED(ac) 0.05 1.01 0.69 0.00 0.00 OK. MANAGED TURF AREA(ac) 0.34 1.54 0.42 0.00 0.00 OK. -1_ MANAGED TURF AREA TREATED(ac) 0.34 1.54 0.42 0.00 0.00 OK. AREA CHECK OK. L OK. OK. OK. OK. i Site Treatment Volume(ft3) 1 Runoff Reduction Volume and TP By Drainage Area D.A.A D.A.B D.A.C D.A.D D.A.E { TOTAL 1 RUNOFF REDUCTION VOLUME ACHIEVED(ft3) 252 2,761 1,611 0 0 4,623 TP LOAD AVAILABLE FOR REMOVAL (Ib/yr) 0.26 2.89 1.69 0.00 0.00 4.84 TP LOAD REDUCTION ACHIEVED (Ib/yr) 0.20 2.19 1.28 0.00 0.00 3.67 TP LOAD REMAINING (Ib/yr) 0.06 0.70 0.41 0.00 0.00 1.17 I 1 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 1.39 15.29 8.92 0.00 0.00 1 25.60 Total Phosphorus FINAL POST-DEVELOPMENT TP LOAD(Ib/yr) 19.29 TP LOAD REDUCTION REQUIRED(Ib/yr) 13.01 TP LOAD REDUCTION ACHIEVED (Ib/yr) 3.67 TP LOAD REMAINING(Ib/yr):J 15.61 I REMAINING TP LOAD REDUCTION REQUIRED(Ib/yr): 9.33 Total Nitrogen(For Information Purposes) POST-DEVELOPMENT LOAD(Ib/yr) 137.98 1 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 25.60 REMAINING POST-DEVELOPMENT NITROGEN LOAD(Ib/yr) 112.38 Virginia Runoff Reduction Method Worksheet DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet -Version 3.0 BMP Design Specifications List: 2013 Draft Stds&Specs Site Summary Total Rainfall=43 inches Site Land Cover Summary 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 8.13 0.00 0.00 8.13 53 Impervious Cover(acres) 0.00 7.19 0.00 0.00 7.19 47 15.32 100 Site Tv and Land Cover Nutrient Loads Site Rv 0.55 Treatment Volume(ft3) 30,697 TP Load(Ib/yr) 19.29 TN Load(Ib/yr) 137.98 Total TP Load Reduction Required(Ib/yr) 13.01 Site Compliance Summary Total Runoff Volume Reduction(ft3) 4,623 Total TP Load Reduction Achieved(Ib/yr) 3.67 Total TN Load Reduction Achieved(Ib/yr) 25.60 Remaining Post Development TP Load (lb/yr) 15.61 Remaining TP Load Reduction(Ib/yr) Required 9.33 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) 0.34 1.54 0.42 0.00 0.00 2.30 Impervious Cover(acres) 0.05 1.01 0.69 0.00 0.00 1.75 Total Area(acres) 0.39 2.55 1.11 0.00 0.00 4.05 Drainage Area Compliance Summary .................,..,.,... _ D.A.A D.A.B _ D.A.C D.A.D D.A.E _ Total TP Load Reduced(Ib/yr) _ 0.20 2.19 1.28 0.00 0.00 3.67 TN Load Reduced(lb/yr) 1.39 15.29 8.92 0.00 0.00 25.60 Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area A Summary Land Cover Summary ,,, ,,,,,,,,,,,,, ,,,,,,,,r,,,,,,o,,,,,,_,, A Soils B Soils C Soils D Soils Total %of Total Forest/Open(acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf(acres) 0.00 0.34 0.00 0.00 0.34 87 Impervious Cover(acres) 0.00 0.05 0.00 0.00 0.05 13 0.39 BMP Selections Managed Turf Impervious TP Load from Downstream BMP Treatment Untreated TP Load TP Removed TP Remaining Practice Credit Area Cover Credit a Upstream Treatment to be (acres) Area(acres) Volume(ft) Practices(Ibs) to Practice(Ibs) (Ib/yr) (Ib/yr) Employed 5.b.Dry Swale#2(Spec#10) 0.34 0.05 419.27 0.00 0.26 0.20 0.06 Total Impervious Cover Treated(acres) 0.05 Total Turf Area Treated(acres) 0.34 Total TP Load Reduction Achieved in D.A. 0.20 (Ib/yr) Total TN Load Reduction Achieved in D.A. 1.39 (Ib/yr) Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area B Summary Land Cover Summary ...... .. . ..... A Soils B Soils C Soils D Soils Total %of Total Forest/Open(acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf(acres) 0.00 1.54 0.00 0.00 1.54 60 Impervious Cover(acres) 0.00 1.01 0.00 0.00 1.01 40 2.55 BMP Selections Managed Turf Impervious TP Load from Downstream BMP Treatment Untreated TP Load TP Removed TP Remaining Practice Credit Area Cover Credit Upstream Treatment to be (acres) Area(acres) Volume(ft)s Practices(lbs) to Practice(lbs) (Ib/yr) (lb/yr) Employed 5.b.Dry Swale#2(Spec#10) 1.54 r 1.01 4,601.03 0.00 2.89 2.19 0.69 Total Impervious Cover Treated(acres) _ 1.01 Total Turf Area Treated(acres) _ 1.54 Total TP Load Reduction Achieved in D.A. (lb/yr) 2.19 Total TN Load Reduction Achieved in D.A. (Ib/yr) 15.29 Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area C Summary Land Cover Summary , ,. A Soils B Soils C Soils D Soils Total %of Total Forest/Open(acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf(acres) 0.00 0.42 0.00 0.00 0.42 38 Impervious Cover(acres) 0.00 0.69 0.00 0.00 _ 0.69 62 1.11 BMP Selections Managed Turf Impervious TP Load from Downstream BMP Treatment Untreated TP Load TP Removed TP Remaining Practice Credit Area Cover Credit s Upstream Treatment to be (acres) Area(acres) Volume(ft) Practices(Ibs) to Practice(Ibs) (Ib/yr) (Ib/yr) Employed 5.b.Dry Swale#2(Spec#10) 0.42 0.69 2,684.39 0.00 1.68 1.28 0.40 Total Impervious Cover Treated(acres) 0.69 Total Turf Area Treated(acres) 0.42 Total TP Load Reduction Achieved in D.A. (lb/yr) 1.28 Total TN Load Reduction Achieved in D.A. (lb/yr) 8.92 Summary Print Virginia Runoff Reduction Method Worksheet Runoff Volume and CN Calculations :.- , . :,°;::::::::::::::::::::::,:::*;:,:::::*.%:-.>.:`,:i:::•?::?:::7::',',72.:A;:3;: :;... 1-year storm 2-year storm 10-year storm Target Rainfall Event(in) •! 7 -3.04 3.67 5.55 . , Drainage Areas : : - -, RV,&CN Drainage Area A.Drainage Area B Drainage Area C Drainage Area D Drainage Area E CN ''.:! .: -. :...- :;°:,:, 1.:*:;.0.:::: 66 76 84 0 0 ..>:•:.:;,:<.••:..::,:-.:.,; RR(ft3) !: ° . .°,,,:::•:•'•:•'-:•:',X-:-:-:-°-:-:.- 252 2,761 1,611 0 0 . . RV wo RR(ws-in) 0.56 1.04 1.55 0.00 0.00 1-year return period RV w RR(ws4n) . 0.39 0.74 1.15 0.00 0.00 CN adjusted 61 70 78 0 0 RV wo RR(ws-in) 0.89 1.49 2.08 0.00 0.00 2-year return period RV w RR(ws-in) 0.72 . 1.19 1.68 0.00 0.00 CN adjusted 62 71 79 0 0 . , RV wo RR(ws-in) 2.11 3.00 3.78 0.00 0.00 10-year return period RV w RR(ws-in) 1.93 2.70 3.38 0.00 0.00 CN adjusted 64 73 80 0 0 Summary Print .,---- \ ‘.(', 't I /j �� `� / LIMTIS OF x c `V / / \ J /' r / J f / / — -'— �_ �' / '.� DRAINAGE AREA - K % r n\ "f ,- / ! 1 , f ! r / �- , ---N f I, °;3..,, \ 1 NOTE:CONTRACTOR SHALL INSTALL SILT FENCE TO BE INSTALLED �/ ,; ;..,,,,,•; f f a % / - r '` / .-� ,4 -,r,•n r. rr+:•y' 'OFF PROPERTY LINE AND OUTSIDE OF THE LIMITS OF GRADING. _ , :f ,t ti 1 ( r N, / `TREE PROTECTION SHALL BE INSTALLED ON THE BACKSIDE OF THE SILT FENCE. ,.'... .._"' ',, l ` �''- f - t ONTRACTOR STAGING AREA\ • i \ / f' // r a , / O.;� /�C x' -_ rf f� TM 90-35V �' -- i \CIO \ EXISTING GRAVEL DRIVEWAY. - LOCATION OF \ _ '" TO REMAIN FOR PHASE It �� FUELING AREA �\,.RONAYNE,B4719 LLC \ ) D:B 4719 P.402 DA II \\ 11•. A♦--- --'' \ �\ �. I I c OCATION OF DUMPSTER D.B. 0 P. 198 PLAT ` �.. �.. o \ 9.5'x8 4' \' 13.8'x15 5' /s / _ os5 i Metal > `'Metal °: j t:„.-.1.:.4..-,,-;:::::,:,f ;- / i °'l \ SOIL DESCRIPTION(TYP.) \ shed t shed tix : OCATION OF PORTA-POTTY ��'1 `� \ gravel:, a� r f / ' 7)Fl. _ - " -\ �j �a; ,jC rp5 #� L! — 40 �( r.'.' ..� 1 , l t �,�''.. •i \ t i. L K / r iil �'�J \ 1 t RWDI E / t S / - _ N / _cursie:: t / J I I *Qr?t.': k r f'1 NOTE CONTRA TC OR HALL j • shed I -WD INSTALL R/W DIVERSION ACROSS / - _ 5S ~` ;/ ! :; ;:: `r j 1 THE CONSTRUCTION ENTRANCE t j _ ETY FENCE -- -NOTE:SEE SHEET 8 FOR rr CONCRETE WASH O I '',': ; , -� _,_, - I• ENT BASIN DESIGN INFORMATION �''" -` _; OUT AREA ! ` E1,? - PROPOSED 4'HIGH AND / 4' i2'x7o'MIN. I '+r . rx" a / EN ' t . ._ :- ."-`- -- - •iarLI1�45'LONG WOODEN BAFFLES_.-- "'� - %�✓a . r. _ _ -- _ "f i< Y �E INSTALLED,OPERATED,AND MAINTAINED BY THE r �.'+'+ `. + + + �� _ �J CONTRACTOR.ALL CONSTRUCTION TRAFFIC IN THIS • - ,�o� • • e ' + - J ,,. w f,,- /� 'yI` t-, AREA SHALL UTILIZE THIS CONSnRUCTIONENTRANCE. f``-•- I - -fillitilig • I PROPOSED SAFETY FENCE '" • ^�'} {{{ — _ - ��� AROUND SEDIMENT TRAP = i t I , �� 1 / CD / a ail. / J • !T :•` ` It ` I O-, P2 - ' - -' NOTE:SEE SHEET 8 FOR -! 1 - `` �__ " DESIGN INFORMATIONt. t� , \ ' '1 i --- t —._- -._...- _ o ••.a e ;.r •i� +--.,.....:`...eve,.. ....,. 1"' .. e • � IS ( =i e0ul <{°c, i COHAURSCE,OSMIRENEILLEGI�,:>.,S,t�• ^ •• <- P` '-':7 .- MtM2-raM• ,. s + _ ' .'8�• -- •�..... - s.:';cc•.z ' 74. ;:`�.�. - 1 M105o `°"`w,"`°`"„ , Y { I p r • .w. y,4 ,.. 13 TATIO ! +. .+� « a +.+ . +'' E-i, + +,,,r+ ' ..s..'-J�� �/Y� �'C �' 'r%C_ .- ..._.... v r`t�G •� 1 a 11 * l a + + • EVA ON 527.7 \ \ . p r o SIGN l \ \,� \ / _ _ _ '/ • / tor',•;i ! 1�: _ __ _ l , I ` {.. -...._.....,.... _w '' _ :, ,ETA"., �( ,�:I r. 4s' X� X-X� I X-X= X- l�= >,1. 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O. y� 4c2 FjY6 ` _F TMP 9b-21H ' -.I=<':; / A _ TMP - 1 H -,- -. ._. - COLLINS E E E I SWPPP EXHIBIT-POLLUTION PREVENTION PLAN DATE:7/12/19 SCALE:i"=5o' 200 GARRETT STREET SUITE K CHARLOTTESVILLE,VIRGINA 22902 OFFICE:434-293-3729 _ — / __ / /` LIMTIS OF o ,/ /( / / // f/ - DRAINAGE AREA r ` \ ``�_/ - / / / /� / �, i�, - I ° ;�.,,,, N NOTE:CONTRACTOR SHALL INSTALL SILT FENCE TO BE INSTALLED ~': '" \• 'OFF PROPERTY LINE AND OUTSIDE OF THE LIMITS OF GRADING. /� /\ ? ', /`TREE PROTECTION SHALL BE INSTALLED ON THE BACKSIDE OF THE SILT FENCE. 1 i I. i i / I --- , I 1 , ,-- \ 1 I ./ 1\ / ei „ �-� --„\ %� %I 'f l� f / f / O.sQ 2�A� \ ONTRAC OR STAGING AREA "� -�-•� _ f \ \ N EXISTING GRAVEL DRIVEWAY, L- \ 1 LOCATION OF, �/ TMP 90 35V / \ RONAYNE,LLC DA — / Sal , N \\\ TO REMAIN FOR PHASE If 1 FUELING AREA / _ _,� , / D:B,.4719 P.402 \ f D-B.44 P. `• 11t3•, A , \ \ \ Y J i" i y'� __ / \ V. 00ATION OF DUMPSTER D.B. 0 P. 198 PLAT 60 9<5'x$4 \ 13.�8x15.5' tr a� • / `/ ~ --�� �, —095-,...._ \ Meal 1 `Metal \-. . ?,a... 1 . '• . \ R / r ' `\,_ /�•`/7_ SOIL DESCRIPTION(TYP<) shell t� shed \ �� s,j�rN '' r� OCATION OF PORTA POTTY - ' gavel` a ..•.ti S `0 _.-_._ - V 'i=*'i:i� r< _ \ rye./. / �� - iu#0 ,- r. 'L ,� _ "/'"'"" - --.._ \ 1 r ,, _\ 't:'+ , ;,1.r.":1 -cl,.t _'S_.- ,> 4 r� T `I f RWD \�.� / ! ' • 1 Ste: ti+"� era``a.:, .r \ l" 1 '1 'rV \ r I / " \I! ,,f___ _______ J t,/ ---- --."::_,.... '''N. 7 I t§? 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