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HomeMy WebLinkAboutWPO200400038 Calculations Stormwater Management Plan 2005-01-25 - 4.,a. ...r.......... .... . ... •,,.--peg•c -1 . . wii+v. of A ' nerNJ to; 'a e: County of Albemarle Department of Community Development Memorandum To: Pam Shifflett,Management Analyst •Greg Harper,Water Resources Manager From: Mark Hopkins Division: Inspections—E&S Control Date: 12 Aug 05 Subject: Conversion To Permanent Stormwater Management Facility The construction of the project listed below has been satisfactorily completed. The stormwater management portion of the Water Protection Bond can be released and the permanent stormwater management facility(ies) should be included in the Stormwater Inspection Program. PROJECT NAME: Ron Martin Expansion TMP: 045C0-02-00-001B0 SITE PLAN NUMBER: WPO 2004-00038 FACILITY DESCRIPTION Type(s) and number of BMPs 1 —biofilter (incl.non-structural) 2—extended detention Description of Outfall 3" orifice in 15" pipe in detention manhole (Ex: 24"RCP from 36"CMP riser) Water Quality RI Yes n No Design Storm Z 10yr ® 2yr Any Additional Information (incl. stream buffer mitigation) A copy of the site plan and details of the BMP(s) are attached. File:I:\Dept\Engineer\Forms\Completed BMPs\00 conversion to permanent swm facility template.doc COUNTY OF ALBEMARLE Department of Engineering&Public Works 401 McIntire Road,Room 211 Charlottesville,Virginia 22902-4596 (804)296-5861 BOND ESTIMATES Date of Estimate: ?5 r-1 OS /��/ y By: M N Sheet: / Of.• / Project Name: ti frta-th211 etrc m da- Project Number .Z 06.4-/ - 0038 Date Submitted: Last Revised: No. Item Description Quantity Unit Price Total Price T, ees te- sk e /Oa 980 ?Can - 8o% = woo Mtninah 19000 ReoG-c*bn Alt/amsmada/asfsm.l Ond J 1 COUNTY OF ALBEMARLE Department of Engineering&Public Works 401 McIntire Road,Room 211. Charlottesville,Virginia 22902-4596 (804)296-5861 PERFORMANCE BAND REDUCTION PROJECT NAME: ge,. / \a- 9'Pn Mtn- 1 uv7 PLAN/PERMIT NO.: R. may. — GM3g DATE: P tip Oj This project has been partially completed and the erosion control performance bond may be reduced to $ rap r Current amount = $ 204©0 , ace ._ . Erosion.Control I ector Copy: Pam Shifflett, Engineering Assistant M1 .toc Al 4,4 tr, 8 Fri pIRGn,0" COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road,Room 227 Charlottesville,Virginia 22902-4596 Phone(434)296-5832 Fax(434)972-4126 Project: WPO-2004-00038,Ron Martin Appliances, SWM plan review Plan preparer: Mr.Kurt Gloeckner PE, Gloeckner Engineering [Fax: 293.7612] Owner or rep.: Logan Martin,Ron Martin Appliances [Fax: (434) 973.2136] Plan received date: 11 January 2005 (SWM plan rev. date 07 January 2005) Date of comments: 25 January 2005 Lead Engineer: Allan Schuck,Engineer A. Stormwater management plan comments: (Allan Schuck) Reviewed under WPO-2004-00038 The SWM plans were previously approved on 08 July 2004, SWM plans rev. date 16 June 2004. The applicant has submitted an amendment to those SWM plans. These SWM plans are approved. 1. The stormwater management plan is approved as submitted. 2. The stormwater management portion of the water protection bond is$20,000.00 and become a part of the whole Water Protection Bond. This bond amount has been posted by the applicant. Copy: Engineering file 2545 [SDP-2003-083] File:E2A_wpo_ADS_04-038 Ron Martin [2545] 1 • , TeRca-A___)AAcet. I t4_72.e...kinp-4.. -T;4- ' • . t-.AQ.A. ITCAVa- ctIG_ - - ii LT.x_c: tk.'S -7-NRt „ • s . r4 . .t. E.,g7Q_K9. 1 ,g E__YVVE.147r. . 170 Fp_ 1.-77 +MATE. _ el.C.).Et.cat7A -cDF__ 14 X HVtoos _iMez _ . _ . .A.. . . _ _ 41. Cfrs-e.e_t_c_cry_ ter,3E 774 IsA.9 if 14 csee___R. Trezt ‘ • 4t- _.V.VILL- S \AA__ _ k_m_c i L. Its°ca . P .Qc3T2R _NM 7114-tE. • ,L t P—n 1_1_ "Tn. 750 t)1,135 rm 'or;ru L."17C LA re, Mon_t_F k in '_1S1t���4 i\ erkto'GP --- - rfis r?t Z_Z.1-_ A rtlz r_uT - - - ` �' �'-'- 1N - _ -- — ���o "- f . c�4__A�c . z ._ 5: �_ Al.A= ©_'i� -t- in .off�- _ t.__ .. - - litkiki A --2,. G_a ___CA % 60.3,6. :".6_,a5__ __D_,_3______777 _ _ot._4_i_ __CSs__ ____ _ PRP- ,. 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NI N)N - O' O:P 1� 0 v (, o N V N p. r` , o * Kok*** *********:K>K*********%I:%K********%KH::k************W.;K;K* ::k%k>K%K :***********N:**** * ROUT VERSION 5 .2 ** PROJECT: MARTIN MINOR AMEND ** DATE : 01-07-2005* ' STRUCTURE 1 STRUCTURE 2 STRUCTURE 3 1 : TYPE 2: PIPE WEIR: 2: ELEVATION ( FT ) 0 .00 0 ,00 0 .00 3: LENGTH ( FT ) 0 .00 0 .00 0 .00 4: COEFFICIENT 0 .00 0 .00 0 .00 RISER: 5: ELEVATION ( FT ) 0 .00 0 .00 - 0 .00 6 : DIAMETER (IN ) 0 .00 0 .00 0 .00 7: ORIFICE ELEVATION ( FT ) 0 .00 0 .00 0 .00 8 : ORIFICE DIAMETER ( IN ) 0 .00 0 .00 0 .00 9: ORIFICE ELEVATION ( FT ) 0 .00 0 .00 0 .00 10 : ORIFICE DIAMETER ( IN ) 0 ,00 0 .00 0 ,00 11 : ORIFICE ELEVATION ( FT ) 0 .00 0 ,00 0 ,00 12: ORIFICE DIAMETER ( IN ) 0 .00 0 .00 0 .00 PIPE: 13: INVERT ELEVATION ( FT ) 402 .34 0 .00 0 .00 14 : DIAMETER ( IN ) 15 ,00 0.00 0 .00 15: ORIFICE DIAMETER ( IN ) 4 .00 0 .00 0 .00 16: LENGTH ( FT ) 17 .97 0 .00 0 .00 17: MANNING 'S N .013 .000 .000 18: SLOPE ( FT/FT ) .010 .000 - .000 19: ENTRANCE LOSS COEFFICIENT .5 .0 .0 SURFACE: 20 : INITIAL ELEVATION ( FT ) 482 ,34 STORAGE PIPE CHARACTERISTICS: DOWNSTREAM INVERT ELEVATION ( FT ): 482 .34 DOWNSTREAM MANHOLE AREA ( SO FT ) : 19 .63 UPSTREAM INVERT ELEVATION ( FT ): 483 .29 UPSTREAM MANHOLE AREA ( SO FT ): 19 .63 PIPE DIAMETER ( IN ): 48 .00 LENGTH ( FT ): 75 .33 CONTROL: RW = RISER ACTING AS A WEIR RO = RISER ACTING AS AN ORIFICE PI = HORIZONTAL PIPE IN INLET CONTROL PO = HORIZONTAL PIPE IN OUTLET CONTROL. TIME INFLOW PIPE TOTAL ELEV STORAGE ( MIN ) ( CFS ) ( CFS ) ( CFS ) ( FT ) ( CU FT ) 0 0 .00 0 ,0 0 .00 482 ,34 0 ,00 1 0 .06 0 .0 PI 0 .01 482 .40 1 .33 2 0 .11 0 ,1 PI 0 .05 482 .51 4 .40 3, 0 .17 0 ,1 PI 0 .10 482 ,60 8 .20 4 0 .23 0 .2 PI 0 .16 482 .69 12 .68 5 0 .28 -0 .2 PI 0 .21 482 .75 17 .21 6 1 .88 0 .3 PI 0 .33 483 .16 64 .87 7 1 .85 0 .4 PI 0 .43 483 .55 154 .15 8 1 .82 0 .5 PI 0 .49 483 .85 236 .85 9 1 .78 0 ,5 PI 0 .55 484 .10 313 .70 10 1 .75 0 .6 PI 0 .59 484 .31 383 .42 13 0) 1 .65 0 .7 PT .70 484 .88 574 .12 14 1 .61 0 .7 PI .73 485 .05 631 .66 15 1 .58 0 .8 PI 0 .76 485 .20 '682 .74 16 1 .55 0 .8 PI 0 .78 485 .35 730 .22 17 1 .51 0 .8 PI 0 .81 485 .49 774 .23 18 1 .48 0 .8 PI 0 .83 485 .61 814 ,87 19 1 .44 0 .9 PI 0 .85 485 .74 852 .26 20 1 .41 0 .9 PI 0 .87' 485 .85 886 .47 • 21 1 .38 0 .9 PI 0 .89 485 .96 917 .60' 22 1 „34 ' 0 .9 PI 0 .90 486 .06 945 .72 23 1 .31 0 .9 PI 0 .92 486 ,16 970 .94 24 1 .28 0 .9 PI 0 .93 486 .25 993 .32 25 1 .24 0 .9 PI 0 .95 486 .33 1 ,012 .98 26 1 .21 1 .0 PI 0 .96 486 .41 1 ,029 .88 27 1 .17 1 .0 PI 0 .97 486 .49 1 ,043 .93 28 1 .14 1 .0 PI 0 .98 486 „55 1 ,055 .18 29 1 . 11 1 .0 PI 0 .99 486 .60 1 ,063 ,71 30 1. .07 1 .0 PI 1 .00 486 .64 1 ,069 .64 31 1 .04 1 .0 PI 1 .00 486 .67 1 ,073 .13 32 1 .01 1 ,0 PI 1 .00 486 .69 1 ,07E, ,67 014 < tb8.4.(o ' 3't 33 0 .97 1 .0' P1 ' 1 .O6 486 .68 1 ,075 .16. PIPE 4401% CI�pAC tTY 34 0 .94 1 .0 PI 1 .00 486 .67 1 ,073 ,54 W` Mkt. -TO 44-Z. 35 0 .90 • 1 .0 PI 1 .00 486 .64 1 ,068 .81 1 t q7 36 0 .87 1 .0 PI 0 .99 486 .60 1 ,062 .39 37 0 .84 1 .0 PI 0 .98 486 .55 1 ,054 .35 38 0 .80 1 .0 PI 0 .97 486 :49 1 ,044 .76 39 0 .75E 1 .0 PI 0 .96 486 .43 1 ,033 .67 • 40 0 .74 1 .0 PI 0 .95 486 .37 1 ,021 . 13 41 0 .70 0 .9 PI 0 .94 486 .31 1 ,007 ,1.8 . � 'O d C�S ^fix 42 0 .67 0 .9 PI 0 .93 486 .24 991 .84 43 0 .63 0 .9 PI 0 .92 486 .17 975 .14 44 0 .60 0 .9 PI 0 .91 486 ,10 957 .09 05 45 0 .57 0 .9 PI 0 .90 486 .04 940 .30 v-- l . 00 End 46 0 .53 0 .9 PI 0 .89 485.97 92.2 .00 ChkEC.14 vrl 47 0 .50 0 .9 PI 0 ,88 485 .90 902 .21 48 0 .47 0 .9 PI 0 „87 '485 .83 880 .95 Me I ' o 10 \#3 49 0 .43 0 .9 PI 0 ,85 485 .7E 858 .22 50- 0 .40 0 .8 PI 0 .84 485 .68 834 .06 51 0 .36 0 .8 PI 0 .83 485 .59 808 .48 52 0 .33 0 .8 PI 0 .81 485 .51 781 .49 53 0 .30 0 .8 P1 0 .80 485 .42 753 .12 54 0 .26 0 .8 PI • 0 .78 485 .33 723 .39 55 0 .23 0 .8 PI 0 .76 485 .23 692 .32 56 0 .20 0 .7 PI 0 .75 485 .14 659 .93 57 0 .16 0 .7 PI 0 .73 485 .04 626 .23 58 0 . 13 0 .7 PI 0 .71 484 .93 591 .24 59 0 .09 0 .7 PI ' 0 .69 484 .82 554 .96 60 0 .06 0 .7 PI 0 .67 484 .71 517 .40 61 0 .03 0 .6 PI 0 ,65 484 .60 478 .56 1a I P �rf'-ern 4- G rg c 10 knee- DITCH CALCULATIONS: NORMAL CRITICAL SLOPE (FT/FT): .0100 .0049 FLOW(CFS): 1.00 ✓ VELOCITY(FT/SEC): 3.8300 2.9728 it LENGTH (FT): 17.97 DEPTH(FT): 0.3319 0.3981 MANNINGS N: .0130 TRAVEL TIME (MIN): 0.08 CIRCULAR CHANNEL pp DIAMETER= 1.25 FT PIPE CAPACITY= 6.482451 CFS C�K > 4 •oo c 5 Fm sloG� Short Version BMP Computations For Worksheets 2-6 Albemarle County Water Protection Ordinance: Modified Simple Method Plan:_ _Ron Martin/Buddy Smith Minor Amend Water ResourceS Area: Development Area Pfeparer: _ Kurth GloecknerhPE,PL.S. Date: -Jan,05 Project Drainage Area Designation DA#1 L storm pollutant export in pounds, L=[P(Pj)Rv/12][C(A)2.72] Rv mean runoff coefficient, Rv=0.05+0.009(1) Pj small storm correction factor,0.9 1 percent imperviousness • P annual precipitation,43"in Albemarle _ _ _ A project area in acres in subject drainage area, L A= .-1 _ 0.77_ C pollutant concentration,mg/I or ppm target phosphorus f factor applied to RR ✓ required treatment volume in cy,0.5"over imperv.area= A(I)43560(0.5/12)/27 RR required removal, L(post)-f x L(pre) %RR removal efficiency, RR100/L(post) Impervious Cover Computation_(values in feet 8 square feet).. I Item tpre-development Area post-development Ikea Roads Length Width subtotal Length _Width subtotal I _ _ 3241 15_12 489868 j 324 142 4600.81 01 0 0 100.._. 14 4 1440 , I I 0 ,_ 0 0 _ 0 _0 4896.88 I. 0 _ 6040.81 ,Driveways Length Width no subtotal Length Width no subtotal land walks _ I 0 0 0 01 0 I t _ 01 ...- 1 b1 0 0 0. 0 ... 0I 1_ 0 0 1. c4--- 0 Parking Lots 1 2 3 4 1 2 3 41 _ -.- 1 0r ` _ I 0 37801 0 0L .: Oh _ 376_01 Gravel areas Area T ( - F Area j • 0 I 1x070= 0 I x070 _ O. Structures Area no subtotal Area no. s_ubtotal IL 0 01 0 0( 0 Ir lAchvely-grazed pasture& Area 0 Oj o� 0 Area - - O- -o yards and cultivated turf I 28965Jx 0.08= 2317.2 _ _ _f 25599kx 0.08 _ _ 2040.721 1 [Adtive crop land Area Area 1 1 I o'x 0.25= ---0 -- - - L - - ---k 0 25 -_._ ---- ------- ---L ._.__.0 ,Other Impervious Areas I oi I 01 Impervious Cover 22%1--- - -- - _ ------- ----- I 35% I(pre) l(post) i_Rv(post).� V i. 0.37j..___13.3.I New Develgpment{F1or Development Areas,existing impervious cover<=20%)_ C T _J.f I(pre)* Rv(pre) L(pre) L(post) RR %RR Area Type ,_ 10'70 1t.00 '"�420% 0.24 115 174 059 34% Development Area 0 35 "1'00 :0% 0.24 0.58 0.87 0.29 34% Drinking Water Watersheds L ,,it040 �„ 100 ;,1% 0.24 0.66 0.99 0.34 34% Other Rural Land •min.values �, -------_.._-...----- --- Redevelopment(,For Development Areas1pxistlng_impervious cover>20%)_ _ C I f � 14pre� Rv(pre L(pre L(pos) _ RR _ _ %RR Area Type_ 0 70 90 0 `� 20% 0.24 1.15 1.74 _ 0.70 40% Development Area _ r0 35 , ,0 85 ..0°?o 0.24 0.58 0.87 0.38 1111111111C21 Dunking Water Watersheds i_ t_. ,0 40` ., 10 85, 'x A:'j% 0.24 0.66 0.99 0.44 44%. Other Rural Land , Interim Manual, Page 70 rev.16 Feb 1998 GEB FOR BMP TAX MAP 45C- 2- 1B SIZE 03- 009- 01 OLD IMPERVIOUS 11,464.87 SQ.FT. 0.26 ACRES i NEW IMPERVIOUS 12,902.28 SQ.FT. 0.30 ACRES 12,902.28 SQ.FT.-11,464.87 SQ.FT.=1,437.41 SOFT. 0.30 ACRES-0.26 ACRES=0.04 ACRES *ADDITIONAL IMPERVIOUS AREA* 1,437.41 SQ.FT. 0.04 ACRES NEW BMP SIZE=5%(12902.28) =645.11 SQ.FT. / USE 8.0'X81.0' AS FILTER BED (648 O.K.) 1/