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HomeMy WebLinkAboutWPO201700024 Calculations WPO VSMP 2017-04-07 Matthew Wentland From: Matthew Wentland Sent: Friday, April 07, 2017 2:36 PM To: Ana Kilmer Subject: RE:WP0201600068 Crozet Pump Station Lickinghole Contribution computations-Crozet WTP Finished Water Pump Station 01,`�/x14-�f-cy c,1 Cpost=0.45 table 4-3 on p.4-20 of VSMH Vol.2 , .)''l 11 Cpre=0.32 uniform for entire watershed, not based on individual site condition �" es- A=0.9 acres A=0.9 ,, ,4.6 `T 'pre = 5.2 1post=6.4 42-490 Qpre =Cpre*Ipre*A--- (0.32)(5.2)(0.9)= 1.50 Qpost=Cpost*Ipost*A--- (0.45)(6.4)(0.9) = 2.59 � / —e L.ay..tiI1 Qdiff= Qpost-Qpre : 2.59—1.50= 1.09 cfs R =477.83 $/cfs BOS Policy recovery rate (last updated 2017) Or(.( _ ) 1 ,9 3 R*(Qdiff)= 520.83 $ °54- = 2v.(Ps Credit for on-site measures Treatment Volume (VRRM worksheet) Tv= 2,254 cfs !7 Z Runoff Reduction (VRRM worksheet) RR= 1,066 cfs RR/Tv= 1,066/2,254=0.47 Cost= 520.83(1-0.47) =$276.04 From:Ana Kilmer Sent: Friday,April 07, 2017 1:58 PM 'V : 3 `-- To: 3To: Matthew Wentland <mwentland@albemarle.org> ff Subject: RE: WP0201600068 Crozet Pump Station 22 I- = 075' They paid $508.51 on 6/26/2014 j Ana D. Kilmer (y 0. 33 Management Analyst Community Development Department 401 McIntire Road t Z) Ij l� — 0,33) Charlottesville,VA 22902 434-296-5832 A 2 0 5. , O 2�7 akilmer@albemarle.org 1 �J From: Matthew Wentland Sent: Friday, April 07, 2017 1:57 PM To:Ana Kilmer<akilmer@albemarle.org> Subject: RE: WP0201600068 Crozet Pump Station ► c + (Z( L Did they pay a fee for the previous plans, WP0201400008? 1 ,8(0 kcc Ana Kilmer From: John Anderson Sent: Wednesday, January 13, 2016 12:19 PM To: Ana Kilmer Cc: Glenn Brooks Subject: VSMP/WP0201500037 -Chesterfield Landing -Lickinghole basin fee Attachments: Mitigation-WP0201500037_Chesterfield Landing-011316.pdf; ESC_bond Chesterfield Landing_WP0201500037_011316.pdf; SWM_bond Chesterfield Landing_WP0201500037_011316.pdf Ana, WP0201500037 (Chesterfield Landing) bond estimates—Attached parcels—confirm TMP 56-36 and 56-36A pro-rata contribution to Lickinghole regional basin= $4,864.13 5� Thanks for your patience. \O,tit c3C� s Lickinghole Contribution computations Cpost=0.50 table 4-3 on p.4-20 of VSMH Vol.2 Cpre = 0.32 uniform for entire watershed, not based on individual site condition A= 10.22 acres A=_10.22 Ipre =4.5 tc of 15 min. App. 4C VSMH Vol.2 !post =4.9 tc of 12.5 min. Qpre =Cpre*Ipre*A--- (0.32)(4.5)(10.22)= (1.44)(10.22) Qpost= Cpost*Ipost*A--- (0.50)(4.9)(10.22)= (2.45)(10.22) Qdiff= Qpost-Qpre : (1.01)(10.22) = 10.3 cfs Qdiff= 10.32 [Qdiff/A=_1.01 , should average around 1.25cfs/acre R=471.23 $/cfs BOS Policy recovery rate (last updated 21 Jan 2015) R*(Qdiff)=_4864.13 $ John E.Anderson.PE I Civil Engineer 11 , 'L Department of Community Development I County of Albemarle.Virginia 401 McIntire Road I Charlottesville.VA 22902 434.296.5832 ext. 3069 2J3 -2_333