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03-04-15-PC
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03-04-15-PC
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6/3/2015 1:25:36 PM
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RCWDPermitNumber14-105 <br />andthe2-yearrainfall eventforexistingconditionsandthegeotechnicalreport (dated11-3- <br />2014); wetlanddelineationreport (dated10-17-2014), anddrainage easementdocument (dated <br />3-25-1980). <br />9. RevisedStormwaterCalculations, dated andreceived2-6-2015, containing narrative, drainage <br />maps, HydroCAD reportforthe2-year, 10-year, 100-yearrainfalleventsforproposed conditions <br />andthe2-yearrainfall eventforexistingconditionsandthegeotechnicalreport (dated11-3- <br />2014); wetlanddelineationreport (dated10-17-2014), anddrainage easementdocument (dated <br />3-25-1980). <br />10. RevisedStormwaterCalculations, dated andreceived2-16-2015, containing narrative, drainage <br />maps, HydroCAD reportforthe2-year, 10-year, 100-yearrainfalleventsforproposed conditions <br />andthe2-yearrainfall eventforexistingconditionsandthegeotechnicalreport (dated11-3- <br />2014); wetlanddelineationreport (dated10-17-2014), anddrainage easementdocument (dated <br />3-25-1980). <br />11. Purchaseagreement forproperties, dated10-24-2014andreceived1-5-2015. <br />12. Agencyletterauthorization, dated1-8-2015andreceived1-9-2015. <br />13. Responseletter, datedandreceived1-30-2015. <br />Findings: <br />1. Description – Theproject, locatedinArdenHills, proposestodemolishtwoexistingcommercial <br />lotstotaling5.41± acresandredevelop thepropertyintosevensinglefamilylots, andassociated <br />utilities. Existingandproposedimperviousareasare1.51± acresand0.80± acresrespectively. <br />Theprojectwilldisturb3.6± acresoverall. DrainagefromtheprojectwilldischargetoDNRpublic <br />watercomplex62-184W, referredtoasFarrell’swetland. Fromthere, itdischargesthrougha <br />naturalchanneltoLongLake, theResourceofConcern. Theapplicanthassubmitteda $2,250 <br />applicationfee, whichcorrespondsto1-2.5acresofnew/redevelopedimpervioussurface (thisis <br />correctasitcorrespondstotheoriginalsubmittal) and2.5-10acresoflanddisturbance. <br />2. Stormwater – TheapplicantisproposingtheBMPsasdescribedbelowfortheproject : <br />ProposedBMPDescription Location Pretreatment: Volumeprovided (CF) <br />Filtrationtrench BackofLot1 See 955 <br />Filtrationtrench BackofLot2 below 1003 <br />Filtrationtrench BackofLot3 993 <br />Filtrationtrench BackofLot4 1,016 <br />Filtrationtrench BackofLot5 1,018 <br />Filtrationtrench BackofLot6 873 <br />Filtrationtrench BackofLot7 730 <br />EastsideofLots1,2, NA – Conveyance4, 5and6Draintilecollectionsystem NA systemWestsideofLots3, 7 <br />Total 6,588 <br />HoustonEngineering Inc Page3of4 2/25/2015
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