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SAN JOAQUIN COUNTY 2009 STORMWATER QUALITY CONTROL CRITERIA PLAN VOLUME REDUCTION CALCULATOR (Update July 16, 2010) TIME STAMP Pqurry • vieTORMWATER 4c;FOR�`P "•��• o>o�� " Working for YOU 10-Make sure that Macros are enabled while using the Calculator 11-This calculator is solely for the purposes of determining compliance with the Volume Reduction Requirement.This is not a substitute and should not be used to determine compliance with SQDV/SQDF or any other new development/redevelopment requirements. No-Volume Reduction is only given to Volume Reduction Measures and LID Treatment Controls.Volume Reduction is not given to Conventional Treatment Controls including wet ponds and proprietary controls. 10-The Calculator is intended as a companion to the SWQCCP and not to replace or be independent of it. Therefore all of the details contained within the SWQCCP are not contained within the calculator. Do-Instructions:Fill in the yellow boxes with the requested information.Numbers in the remainder of the boxes will be automatically filled out for you. >Each of the following worksheets will assist you in calculating the volume reduction achieved for Volume Reduction Measures and LID Treatment Controls.A worksheet must be filled out for each Volume Reduction Measure and LID Treatment Control(e.g.,if there are 3 Rain Gardens proposed on the site,3 Rain Garden worksheets must be filled out). >Once the information is filled out for the proposed Volume Reduction Measures and LID Treatment Controls,click in the red box below.This will run a macro that will sum up the volume reduction achieved by Volume Reduction Measures and LID Treatment Controls.NOTE to Mac Users:The Mac version of Excel may not be capable of running macros so you may have to manually sum up the volume reduction gained from Volume Reduction Measures and LID Treatment Controls. Project: Proposed Air Cargo Facility,4725 South B Street,Stockton,CA Detail: Design by: Benjamin S.Root Date: 2/7/2020 1. PRE-PROJECT CHARACTERISTICS Notes a.Total Project Area,ft2(ApRE) 394652.0 Total Project Area must be entered first before any other calculations can be made b.Weighted Runoff Coefficient(CrPRE) 0.05 Go to"Cr Calcs"to calculate(orange tab) c.Volume Reduction Requirement storm depth,inches(d) 0.51 Avg.85th percentile,24-hour storm depth for Stockton area d.Significant Redevelopment Volume Reduction Credit,inches(Redev,redic) An additive credit of 0.05 inches is available for five types of redevelopment projects: -Siginificant Redevelopment(as defined in Section 2.1 of 2009 SWQCCP) -Credits are additive such that a maximum credit of 0.25 Brownfield redevelopment 0.00 inches is possible for a project that meets all five criteria. High density(>7 units/acre) New development projects are not eligible for the criteria. Vertical Density(FAR of 2 or>18 units/acre) Mixed use and Transit Oriented Development(within 1/2 mile of public transit) e.Revised Volume Reduction Requirement storm depth,inches(dmvised) 0.51 f.Pre-project Runoff Volume,ft3(VOIPRE) VOI PRE—(drevised ) PRE xrPRE /12 x A C 838.6 2.POST-PROJECT CHARACTERISTICS Notes a.Total Project Area,ft2(AposT) 394652.0 b.Weighted Runoff Coefficient(CrPOST) 0.63 Go to"Cr Calcs"to calculate(orange tab) c.Volume Reduction Requirement storm depth,inches(d) 0.51 d.Significant Redevelopment Volume Reduction Credit,inches(Redevcredlc) An additive credit of 0.05 inches is available for five types of redevelopment: -Siginificant Redevelopment(as defined in Section 2.1 of 2009 SWQCCP) -Credits are additive Such that a maximum credit of 0.25 Brownfield redevelopment 0.00 inches is possible for a project that meets all five criteria. High density(>7 units/acre) -New development projects are not eligible for the criteria. Vertical Density(FAR of 2 or>18 units/acre) Mixed use and Transit Oriented Development(within 1/2 mile of public transit) e.Revised Volume Reduction Requirement storm depth,inches(dmvised) 0.51 f.Post-project Runoff Volume,ft3(VOIPOST) 10508.9 VOIPOST—(0.51/12)x ApOST x CrPOST VOLUME RUNOFF REDUCTION REQUIREMENT,ft3(VRR) 9670.2 POST— PRE VRR=Vol Vol