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HomeMy WebLinkAboutWPO201900003 Calculations Stormwater Management Plan 2019-05-13 PLEASANT GREEN FINAL STORMWATER MANAGEMENT CALCULATIONS PACKET (Phase I) Date of Calculations DECEMBER 28, 2018 Revised on FEBRUARY 21, 2019 Revised on MAY 13, 2019 APPROVED by the Albemarle County Community D ve Date pment Department File ----4). ..ems o - - PREPARED BY: COLLINS ENGINEERING a EALrxi 200 GARRETT STREET, SUITE K 4O1 OF10 II CHARLOTTESVILLE, VA 22902 i0{` 5a U '1 434.293.3719 PH S Corr R• INS 5$ 434.293.2813 FX o• No. 0357COLL97 j www.collins-engineering.com , -dA /'3���1 Q�4 sstt4 L Boo SCS TR-55 Calculations Soils Mapping (Source: NRCS Web Soil Survey Online Database) f % asI • ti yam * ..•\1:,•,:i ': . ' J—. ii f Soils Table (Source: NRCS Web Soil Survey Online Database) Albemarle County,Virginia(VA003) Albemarle County, Virginia (VA003) Map Unit Percent of Symbol Map Unit Name AOI 7B Braddock loam, 24.9% 2 to 7 percent slopes 17 Craigsvliie loam 17 1% 25B Dyke silt loam, 46.7% 2 to 7 percent slopes 36D Hayesviile 11 3% loam, 15 to 25 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) Map ‘gc. C Terrain C,, 3 f," `,i v OQaQ 4 S, O Ge0, P�C'�`A 4',� y A�Ake r. 6 , fr %° o to .c a ®r 4i^ �wEs d I A /ro y Q ' —I— I vCo$',0' �� 4f a o° 4rotd h S7 e. Way(a a Jeje'h'at, a av oti 'd 0a`gar% Q v r Crozet 0 `'' Th r r e s a 4vdfe U` + =t V Jatmans Gap Rd ('orar, Av _ r 200m loon 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 Duration I Average recurrence interval(years) I I 1 II 2 I I 5 l l_ 10 II 25 II 50 I[ 100 II 200 II 500 II 1000 i 24-hr 3.07 3.71 4 73 5.58 6.83 7 90 9.08 10.4 12.3 14.0 (2 76-3 43) (3.34-4 15) (4.24-5.29) (4.99-6.23) (6.06-7 60) (6.96-8.78) (7 93-10 1) (8.96-11.5) (10.5-13 7) (11 7-15.6) U S Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 2 Runoff Curve Number and Runoff Project Pleasant Green-Phase I Designed By FGM,PE Date 5/13/2019 Location Pleasant Green Street Checked By SRC,PE Date 5/13/2019 Check One Present X Developed X 1 Runoff curve Number(CN) f Soil name and Cover description CN(weighted)= Drainage Area Area Product of CN Calculated tion hydrologic group (Cover type,treatment,and hydrologic condition,percent CN total product/ Descrip tion (Acres) x Area 'S'Value (Appendix A) impervious,unconnected/connected impervious area ratio) total area DA A Impervious Areas 98 013 12 3 (Pre-Dev) B Woods In Good Condition 55 1.62 89 1 60 2 6 60 Lawns in Good Condition(75%+Groundcover) 61 4 97 _303.4 B Impervious Areas 98 0 27 26 9 DA (P DA BV) B Woods in Good Condition 55 0.46 25 3 63.0 5.87 Lawns in Good Condition(75%+Groundcover) 61 2 94 179.0 DA A&B Impervious Areas 98 4 52 443 2 B Woods In Good Condition 55 0.00 0.0 74.2 3 48 (Post-Dev) Lawns In Good Condition(75%+Groundcover) 61 816 _ 497 6 DA E Post-Day'DA E'is used only for VRRM Water Quality Inputs (Post-Dev) B Impervious Areas 98 0.48 47 0 717 3 95 Lawns in Good Condition(75%+Groundcover; 61 118 72 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 07 3 71 5 58 n/a Runoff,Q-inches 0 37 0 64 1 67 DA A(Pre-Dev) Runoff,Q-inches 0.46 0 77 1.89 DAB(Pre-Dev.) Runoff,Q-inches 0 96 1.40 2 85 DA A&B(Post-Dev) Runoff,Q-inches 0.83 124 2 62 DA E(Post-Dev) U S Department of Agriculture FL-ENG-21A Natural Resources Conservation Service 06/04 TR 55 Worksheet 3 Time of Concentration (Tc)or Travel Time(Ti) Project. Pleasant Green-Phase I Designed By FGM,PE Date 5/13/2019 Location Pleasant Green Street Checked By: SRC, PE Date. 5/13/2019 Check One• Present X Developed X Check One• Tc X Tt Through subarea n/a DAA DAB DAA&B Segment ID (Pre-Dev) (Pre-Dev) (Post-Dev) Sheet Flow (Applicable to I,only) 1 Surface description(Table 3-1) Dense Grass Dense Grass Dense Grass 2 Manning's roughness coeff,n(Table 3-1 0 24 0 24 0 24 3 Flow length, L(total L<100)(ft) 100 100 100 4 Two-year 24-hour rainfall,P2(in) 3 7 3 7 3 7 5 Land slope,s(ft/ft) 0.04 0.04 0 04 6 Compute Tt=[0 007(n*L)08]/p20.5 Z.s s°4 0 17 0 17 0.17 Shallow Concentrated Flow. 7 Surface description(paved or unpaved) Unpaved Unpaved Unpaved 8 Flow Length,L(ft) 1115 1075 190 9 Watercourse slope,s(ft/ft) 0 052 0 028 0 058 10 Average velocity,V(Figure 3-1)(ft/s) 3.7 2.8 3 9 11T1=L/3600*V 0.08 011 001 Channel Flow 12 Cross sectional flow area,a (ft2) QS N N Q N N- 13 Wetted perimeter,PW(ft) o 14 Hydraulic radius,r=a/PW(ft) o dU 15 Channel Slope,s(ft/ft) LL E. v 16 Manning's Roughness Coeff,n o E in a' 17V=[1.49r213s°'s]/n COup CO 18 Flow length,L(ft) `- 19 Tt=L/3600*V 0 04 20 Watershed or subarea Tc or Tt (Add Tt in steps 6, 11 and 19) 0.25 0.27 0.22 U S Department of Agriculture FL-ENG-21C Natural Resources Conservation Service 06/04 TR 55 Worksheet 4 Graphical Peak Discharge Method Project. Pleasant Green-Phase I Designed By. FGM,PE Date 5/13/2019 Location Pleasant Green Street Checked By SRC,PE Date 5/13/2019 Check One Present X Developed X Drainage Area Drainage Area Drainage Area Drainage Area 1 Data Description Description Description Description DAA DAB DAA&B (Pre-Dev) (Pre-Dev) (Post-Dev) Drainage Area(Am)in miles= 0 0105 0 0057 0 0198 Runoff curve number CN= 60.2 63.0 74.2 Time of concentration(Tc)= 0.25 0.27 0 22 Rainfall distribution type= II II II Pond and swamp areas spread 0 0 0 throughout the watershed= 2 Frequency-years 1 2 10 1 2 10 1 2 10 3 Rainfall,P(24 hour)-inches 3 07 3 71 5 58 _ 3 07 3 71 5 58 _ 3 07 3 71 5 58 4.Initial Abstraction,la-inches 1.32 1.32 1.32 1.17 1.17 1.17 0.70 0.70 0 70 5 Compute la/P 0 43 0 36 0 24 0 38 0 32 0 21 0 23 0 19 0 12 6.Unit peak discharge,Qu-csm/in 475 575 675 525 600 650 725 750 775 7.Runoff,Q from Worksheet 2-inches 0.37 0.64 1.67 _ 0.46 0.77 1.89 0.96 1.40 2.85 8 Pond and Swamp adjustment factor,Fp 1 1 1 1 1 1 1 1 1 9 Peak Discharge,Qp-cfs where Qp=Qu Am Q Fp 1 83 3 84 11 85 1 39 2 63 7 04 13 84 20 80 43 81 WATERSHED SUMMARY 1-year Flow, 2-year Flow, 10-year Flow, CN Area,ac. cfs cfs cfs DA A (Pre-Dev) 60 2 6.72 1 83 3 84 11.85 DA B(Pre-Dev.) 63.0 3 67 1 39 2.63 7 04 612 1039 322 647 1889 1-year Flow, 2-year Flow, 10-year Flow, CN Area,ac cfs cfs cfs DA A&B(Post-Dev) 74 2 12 68 13 84 20 80 43 81 9 VAC 25-870-66 Subareas A& B 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.a. "The manmade stormwater conveyance system shall convey the post development peak flow rate from the two-year 24-hour storm event without causing erosion of the system. Detention of stormwater or downstream improvements may be incorporated into the approved land- disturbing activity to meet this criterion..." Section B.4.a Limits of Analysis The stormwater detention facility outfalls immediately upland of a defined channel that is located within a FEMA mapped floodplain.The limits of analysis ends at the riprap lined outfall chanel since "the site's contributing drainage area is less than or equal to 1.0%of the total watershed area." NOTE: Please see sheet 10. Sheet 10 shows the site's contributing drainage area is less than 1.0%of Powells Creek's total watershed at the point of discharge. 9 VAC 25-870-66 Subareas A& B 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.a.: Concentrated stormwater flow to stormwater conveyance systems that currently experience localized flooding during the 10-year 24-hour storm event "confines the post development peak flow rate from the 10-year 24-hour storm event within the stormwater conveyance system to avoid the localized flooding." NOTE:The proposed storm sewer and riprap outfall channel confine the post-development 10- year 24-hour storm event without causing erosion or flooding. Section C.3.a Limits of Analysis "...stormwater conveyance systems shall be analyzed for compliance with flood protection criteria to a point where...The stormwater conveyance system enters a mapped floodplain or other flood-prone area..." uSM� Acco.�+o,�NcE wpm • CH Ste. 31� Q!�ce - \�l rGi-"/ sl 131i1 0\0 -A1�= 43p1 cps S► C = 1.S /> eA._ i€ 3,i9 -3 i E &• SX ESVE LA{LG�� ,j � ETG2 ON v poS VO, CLASS Pt (2.zp?.{�0 OAS o mcx) 0 C NnnuNfE.L 5v3t Si-s` aoc C4R R 3\ i a.• Yce-n '3,0-11 \{3= 1.4 x \ 3 = O,So` \,t = 0.55' � 1 { CLP,ss Az ( dam,= o.�6 ME (�NT �CC�v.1 3Q 21?Q L or- vQ6- S b .0 vse �^ Cu�`eo Fbaw PZN E 1)(,/jc.ED .AM 6" P R RNA iS �lr( THAry A�. V�kir LL. �� op S ss "l TFi '�M ssa'. ;�ssp�c� 'Two T c.S (c),1) 01wyp.. u -ic r( xN L -7- y,`15 is Riprap Channel Outfall Design- 2yr Complex Channnel- Riprap Lined Channel (2-yr Design Storm) Input: Slope 0.015 Flow (given) 20.800 line x y n 0 0.000 2.000 0.050 (first n value not used) 1 6.000 0.000 0.050 2 7.000 0.000 0.050 3 13.000 2.000 0.050 Output: Depth 1.350 (y) ( 1.350) Channel bed segment output: line Q V A P 1 7.40 2.70 2.74 4.27 2 6.00 4.45 1.35 1.00 3 7.40 2.70 2.74 4.27 Tue May 14 15:41:13 EDT 2019 Page 1 Riprap Channel Outfall Design- 10yr Complex Channnel- Riprap Lined Channel (10-yr Design Storm) Input: Slope 0.015 Flow (given) 43.811 line x y n 0 0.000 2.000 0.050 (first n value not used) 1 6.000 0.000 0.050 2 7.000 0.000 0.050 3 13.000 2.000 0.050 Output: Depth 1.840 (y) ( 1.840) Channel bed segment output: line Q V A P 1 16.88 3.32 5.08 5.82 2 10.06 5.47 1.84 1.00 3 16.88 3.32 5.08 5.82 Tue May 14 15:40:51 EDT 2019 Page 1 199Z. TABLE 5-22 PERMISSIBLE VELOCITIES FOR UNLINED EARTHEN CHANNELS Permissible Velocity Soil Types (ft./sec.) Fine Sand (noncolloidal) 2.5 Sandy Loam (noncolloidal) 2.5 Silt Loam (noncolloidal) 3.0 Ordinary Firm Loam 3.5 Fine Gravel 5.0 Stiff Clay (very colloidal) 5.0 Graded, Loam to Cobbles (noncolloidal) 5.0 Graded, Silt to Cobbles (noncolloidal) 5.5 Alluvial Silts (noncolloidal) 3.5 Alluvial Silts (colloidal) 5.0 Coarse Gravel (noncolloidal) 6.0 Cobbles and Shingles 5.5 Shales and Hard Pans 6.0 Source: American Society of Civil Engineers cHAI,P)C4., 1.4/1 Wc$Q0c-s,) €?..;/.k.4.kk4. , .7,10004. mAN 6 c:4 ,;-;\ 64E.Seil 5-* , Mktvimil AccoN-1, 41., „ -t tkop,A9 V - 140 Virginia Runoff Reduction Method Water Quality Calculations (COMPLIANCE IS MET THROUGH TWO BMPs. THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS & THE INSTALLATION OF A LEVEL II BIORETENTION BASIN ARE PROPOSED.) DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet-Version 3.0 ❑2011 BMP Standards and Specifications 02013 Draft BMP Standards and Specifications Project Name Pleasant Green-Phase I CLEAR ALL data Input cells Date: 5/13/2019 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 Soils B Soils C Soils D Soils Totals Forest/Open Space(acres)-undisturbed, protected forest/open space or reforested land 0.00 0.00 Managed Turf(acres)-disturbed,graded for yards or other turf to be mowed/managed 8.60 8.60 Impervious Cover(acres) 4.55 4.55 1 13.15 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 Post-Development Requirement for Site Area TP Load Reduction Required(Ib/yr) 8.39 LAND COVER SUMMARY--POST DEVELOPMENT Land Cover Summary Treatment Volume and Nutrient Loads Forest/Open Space Cover(acres) 0.00 Treatment Volume 0.5035 (acre-ft) Weighted Rv(forest) 0.00 Treatment Volume(cubic feet) 21,934 %Forest 0% TP Load(lb/yr) 13 78 Managed Turf Cover(acres) 8.60 TN Load(Ib/yr) 98.59 (Informatipnal Purposes Only) ,. Weighted Rv(turf) 0.20 %Managed Turf 65% Impervious Cover(acres) 4.55 Rv(impervious) 0.95 %Impervious 35% Site Area(acres) 13.15 Site Rv 0.46 N0150I.14._o6.mN.1 Drainage Area E aSI..mot 1As..dCWw ONrN AS. ON. _ Csr Dswer ..emag4e5r7014.0.1 MOO N.rtafm0140e0 1.11 1.16 0.E0 e.eer+wlw..Noe,l DAB D..B D.n Telal Phelphoma A0.ask for nmo,4I In DA E 10/1,I I.sa Paul 1.66 Pat ae.eete.e.t Tr....Veame N D.A.E(R) IS12 Stormwater Best Management Practices(RR=Runoff Reduction) •.xlett Iron,dreadown 0519- R.rwi 0001106 TUT Ingo* Velum rem Remaining o*I0M N.P Nehmm rhoOfTeru5 u.ue.ua WgRes...eNN , Res... r,.a Nagm mm Unmated Manger. ReapPecik. ReAA.bn Gnat Are Corer1000 UpstreamROmN RRUMI Treatment RRn,ntl lead Tram eNesgmus Removed Dv .0105 .0 powao-eamhMkamM enronal Ir.m UWtrexn NNrogen lwd to REnrmedh NRTOgm Loma eMI (00 re.) A lama) er«Uc.lrt5 xraRDon(R51 vwme in) in*in) Lfflsoop(SI)n 'UpsVemm Load. rwneeeN mad(ul urol0r.d *Ou0-,)51) rrxtkes(ls,) masa.e(01) n.Ot ae MN) RE) .,1 Vr,ca0 R.I IRRI .aMl. 5 Vegetated Roof IRRI l..v.bev.d AOnMpen MEE= ,Spec MI n __...._... I vegelaa.ON.2 D04KnI eo 0 0 0 0 am ENO 000 0 } am EM® ] 0 „0�rrrl.an IRRI I.r. 10 OBS.N R�� m 0 0 0 0 0 0Ao OW am nm o 0m on, am nm ]0.So,*Dn.onm0,rt00l0 seer a e II o O a on, nW am on, 0 0m on, Om Om De•eell _ Sw�MI m 0 0 0 0 O Om 0.W 0.m o.W 0 Om nm Om Om wlipo.al m 0 O 0 0 ]S am o.m O.m nm 55 nW Om LW OAO re dv weu nrnrrmm 0nrnn' 0 S (Soft .0 o 0. On, Om Om 6.entrooNscespos 011So M m o 0 0 0 N on, Om 0m Om W Om 0.m on, OW Ahotonsmmin M ltpr.N IN0 O 0 0 m am 0.m O.m aW m an o.m O.m aW i.a.ie R.,.wm1l..ea�.e Dwe al 0 0 0 0 0 o CM 000 OM O.W 0 am O. On, am 1Amn elememMtloe.MAsorer..l M o 0 0 0 lS 0m am Om am a On, On, MO Me t..rwn,erre Farm 41150e.471 01 o 0 0 0 25 0.m 0.m .0 am ® en 0.m KO.0en..,der..00002 Coe,EN 75 lii0 0 0 is O.m O.m am © 0.m =E0 a.C..mu.d Ms�q.,JAI a 0 0 0 0 u on, am 000 R00 a en r o01 Om mE= .S.rw,0,w,.40s..r1N,r.m 10 0 0 0 O u O.m am Om am a== am 11113111111311 4..0 Emmet NM rIwetea Imw00 al Amwd.dot ID o a 0 e 00 Om Pm eW Om m OM om en WM Orr 5..1091 +re IRRI DNS...a.DNS el(spec.0n m 0 0 0 a Lo 0.m an am Oro MIMI Om 0.W 0 Sa 005.aen 0om.1al W o 0 0 0 m am am am am ® am On Ma 0.CO on(RR Oa l.anNermenmnlso,e ON nw R0 IIo 0 0 0 MOOOn, n GOD O.W IZE 0.m en MIME b.a.el,,.u,n 15a,ml0eeinerem�B] a LL nM 0 1010 SO2 MIS S0 am Iso 10E a1b MIE am ILL ®® T.In n,,en IRRI L,.rnrN-m,eo Fr(Spen] 50 a 0 0 0 n 000 an, 000 OW ME Om en ,.Inrn,i,r0n 11s0e.a1 90 0 0 0 0 n 00, 0W am 0.m ® aW Pm WE .,f,tende0 Detention Pond IRRI B.f atended Detention Pond 1RR1 Ra.Sn.t(5p.a1f1 O O 0 0 o Is On O.W OM OW ME am en .A.10 n 0.0.44151 IS e 0 0 0 IS CO 0.m D.m OM ME um en, =EMI ..50eetrlow to F,eerIDpen Son.INN ono non 9a a..tro. 1sa.m Aawwbeer Ts B D 0 0 o am nm on, am o MOO on, am t'Dp.� m 0 0 0 0 9a.a.erro.O tN.NNs ester Rda a Ras or C.*abed04155a m B 0 R o 0 on, aW 0m Om o on, am on, on, ED WI NM ARfA000 OK TOTAL MAN 0ED mRS AREA 6100-MO(01 1.10 MM.MOCK OIL Tm0 RUNOrr REDUCTION m DA.E(Iel OM EMAN LL TOTAL e005.NORUS RE NovE00000 A UNO.E REDUCTOM p00-cobS IN 0.A E 11,/NI LEI TOM RUNOFF DUC1109 IN0A EIN) 2.050 2016np0 NOR O50US m ER 0000lNO AFT APPLYING RUNOFF REDUCTION P0KINES IN OA E Oe/N GL ) 616 NI1RON REMOVED w111 RUNOFF 00u0-ION MMCTIfUS IN OA 6(0/5,I 003B SEE WATEROUALIrr COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS SCE WATER OUAlUrYCOMPIIANCE TAB;OR sin CALNUnONSIlnform0fion ONYI i WTI 1.10 6.01100 RR I 10A.0000 1.1000 nll 0 0 D 0 0 0 QM OM am Om © OOD 0m - TOO.W00°Om°EP.rnO 0 0 I 0 0 n 0.m Om 0m OM ® 0.m 0.m =EWE 11 F Owing o m!a510O RRI II.F 00.5 RIIn[e.(no RR1 Ii...Exwv0PO.eaunl1D.r.MI 0 0 0 0 0 00 Om Om 0O0 0m 00 0m 0m 11 3..0000 P..DON.xifo.0 MI 0 0 0 0 0 65 om 0m Om 0m ME 0m 000 ME 11 Momroaee WeI,O(n0 RRI 12.CDnnr0000 WPI*IA Nn RRI Ix,.eaeln.nN w.n.�anlse.e nll 0 O 0 0 0 w Om Om ODO Om Mil Om Om D.03 O. nA.Cmr0owel./M.t0P.r.Lel 0 0 0 0 0 75 0.m _OM 000 000 ® Om Om uu.rro«I�,DRI u,.w..nneTT pm116, o o a 0 0 50 am Om om om .o D.m D.m O.m om 13.6.onesilDVPHM1N11504.1.1 0 0 0 O O .1 Om Om OM Om FoO.m Om O.m 0.03 IID.Wel Moe M.6161.1 0 0 O 0 O 0m Om ODD OM TO om 0m O.m am I3w.wn000enlm,0NPAA010.R1.1 0 0 0 0 O a O.W 000 0D0 Om n 000 OM 0.m 0m va. ai...,u rea man ..mes l+o eel r,_,.... c B,NPImPRI 0 0 O 0 0 10 O.m o.m om am am om IIb.M.0.P...rn.a.n.�.FIR* 0 0 0 0 0 XIOm Om aW a Om Om m rt01.T 0..8 TOTAL M NAOEO ANRr AOEA TREATED(O01l 118 I A.Tir. CNEE0 OR. TOTAL PHOSPHORUS REMOVAL REWIRE°ON Pre IIe/yrll R.3a TOTAL PHOSPHORUS AVAIV.RIE rove REMOVAL IN OA.E Ile/Trl I.SO TOTAL PNOSPNORUS REMOVED WITHOUT RUNO0R REOIICTON DRACTIGES IN 0.A.f ON/TO 0.00 TOTAL PHOSPHORUS REM0VE0 WITH RUNOR RE WCT10N PRACTCES IN D.A.E(R/yrl 1.0 TOTAL PHOSPHORUS TOAD REDUCTION ACHIEVED IN D.A.Ep0/M 10 Form PNDSPNOR05 FEM.INOn 65TTR.PPI0WG MAT man REINIcn0N0IN 0 0 R pN/yrl 0.16 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN A.E 013MI 10.38 NITROGEN REMOVED W10OUT RUNOFF REDUCn0N PRACTICES IN D.A.E Mir/ 0.00 tor.NITROGEN REMOVED IN O.A.E ll0/yrl 10.38 B I C I D l E I F I G I H 1 I Site Results (Water Quality Compliance) 1 2 Area Checks D.A.A D.A.B D.A.C D.A.D D.A.E AREA CHECK 3 FOREST/OPEN SPACE(ac) 0 00 0 00 0.00 0.00 0 00 OK. 4 IMPERVIOUS COVER(ac) 0 00 0 00 _ 0 00 0 00 0 48 OK. 5 IMPERVIOUS COVER TREATED(ac) 0 00 0 00 0 00 0 00 0.48 OK. 6 MANAGED TURF AREA(ac) 0.00 0 00 0 00 0 00 1 18 OK. 7 MANAGED TURF AREA TREATED(ac) 0.00 0.00 0.00 0.00 1.18 OK. 8 AREA CHECK I OK. II OK. --1I OK. 1 OK. OK. 9 10 Site Treatment Volume (ft3) 1 11 12 Runoff Reduction Volume and TP By Drainage Area _ 13 D.A.A D.A.B D.A.C D.A.D I D.A.E TOTAL 14 RUNOFF REDUCTION VOLUME ACHIEVED(ft3) 0 0 0 0 2,010 2,010 15 TP LOAD AVAILABLE FOR REMOVAL (lb/yr) 0 00 0 00 0 00 0 00 1 58 1 58 16 TP LOAD REDUCTION ACHIEVED (lb/yr) 0.00 0.00 0.00 0.00 1.42 1.42 17 TP LOAD REMAINING (lb/yr) 0.00 0.00 0.00 0.00 0.16 I 0.16 18 19 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr)[ 0 00 0.00 I 0 00 I 0.00 10 38 10 38 20 21 Total Phosphorus 22 FINAL POST-DEVELOPMENT TP LOAD(lb/yr) 13.78 23 TP LOAD REDUCTION REQUIRED(Ib/yr) 8 39 24 TP LOAD REDUCTION ACHIEVED (lb/yr LL _ 1.42 25 TP LOAD REMAINING(Ib/yr)•I 12 36 26 REMAINING TP LOAD REDUCTION REQUIRED(lb/yr) 6 97 27 28 Total Nitrogen (For Information Purposes) 29 POST-DEVELOPMENT LOAD(Ib/yr)i' 98.59 30 NITROGEN LOAD REDUCTION ACHIEVED (lb/yr! 10.38 31 REMAINING POST-DEVELOPMENT NITROGEN LOAD(lb/yr! 88 21 32 33 34 RECEIVED JUN 0 3 zn1A COMMUNITY DEVELOPMENT