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DEVELOPED CONDITIONS <br />Thc Scnipps Rctail Group Projcct proposcs to build a 23,500 SF commcrcial unit on a <br />2.27-acre sitc. Approxinmtcly 33,000 SF of pavcd drivcway and parkin� alone with <br />7,000 SP of sidcwalk will bc constructcd. 'Chc proposcd parking lot will takc acccss from <br />Evcrclt Malt �Vay via a commcrcial drop curb. <br />A dctcntion vault is proposcd to mitigatc lhc incrcased storm watcr runoFf from thc <br />devclopcJ imperviuus surf:!ces. Storni �vatcr runoff will bc relcascd from tlie detcntion <br />vauit at pro-dcvclopcd ratcs of'h o(thc 2-ycar siorm and 100% of thc 10 and 100-ycar <br />storni cvcnts. Thc vaull is dcsigncd and sizcd using thc Collo�i�ing paramctcrs: <br />• Thc dcvclopcd conlributing basin is �hc cntire sitc plus (sec basin map in <br />appendix). Al! arcas not idcntificd as impervious arc assumcd to bc in lawns and <br />landscapin�. <br />• Dctcntion calculations arc bascd on an assumptiou of prc-dcvclopment 2"� <br />growth Corested wnditions cver the entire site. <br />• Thc dctcntion vault is sizcd per D.O.L.'s 2001 guidclincs lo providc storagc for <br />runofl from a 100-ycar dcsigu s�orni. Thc outict stnicWrc will rcicasc <br />slomnvatcr at rates not cxcccding the prc-devclopmcnt pcak nmoff rates of onc- <br />half thc 2-ycar, and thc cntirc 10-ycar and 100-ycar, 24-hour dcsign stonns <br />cvcnts. <br />Thc "Stom�shcd" program Sanla Barbara Unit I lydrograph (SBUI I) mcthod and Typc lA <br />rainfall dislribution tvas uscd to calculatc ruuoff amounts and modcl thc dctcntion vault. <br />Tlic proposcd dctcntion vault will bc locatcd undcr thc parking lot ncar thc southcast <br />corncr of thc property closc tu thc sitc acccss. It will havc a control structurc dcsigncd to <br />rcicasc pcak nmoff at prc-dcvclopcd �unoff ratcs of �0% of thc 2-ycar and 100"/0 of thc <br />10-ycar and 100-ycar storm cvcnts. Thc control strucmrc will bc locatcd outsidc thc vault <br />and will bc acccssiblc from thc proposai privatc drivcway accessing thc sitc. Down <br />strcmn of tBc vault �vill bc a Cuntcclt Stornifiltcr to providc watcr quality beforc nmoff <br />cntcrs cxisting calch b,isin locatcd nc:ir thc southwest corncr of thc properry. <br />Thc tablc bclow summarizes thc dcsign for thc vault. <br />5I2Al07 <br />a UESIGN <br />CA.GROUP <br />