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1 <br /> � Storm Drainage Report <br /> ' Project Overview Sca���ay Lot 2A is a 6.22 acrc parccl, of which 1.2 acres ��ill bc <br /> dcvclopcd as commcrcial in thc Scaway Centcr devclopment. Thc <br /> ' proposed site will consist of one building and associated parking. <br /> Sanitary sewcr and watcr mains will connect to ihe existing sewcr <br /> and water system located in or near Seaway Blvd. <br /> ' Thc [a5tcrn topography of dic sitc is stccp-slopcd downhill from thc <br /> cast to the \�1'cst(-40°o slopes). The devclopment arca of thc site is <br /> t located on thc«cstcrn sidc of Wc parccl and �cntly slopcs to thc <br /> H�est as�vell. Soil co��cr of the site is a sandy soil and is a vep���cll <br /> draincd sitc. <br /> ' Itunoff from thc sitc drains to thc R�cst. Thc ditch on ilic Soutli sidc <br /> of the property con�eys runof(to a conswcted wctland. This <br /> wetland eollects somc �+ater f-om Powder Mill Gulch and some <br /> ' from the proposed site and ditch. Thc water[hcn re-cnicrs Powder <br /> Uill Gulch. <br /> ' 'Chcrc arc no critical arcas spccificall}'on dic sitc, hawevcr duc to <br /> thc stcep slopes on the Eastem half o(the site, NGPA has bccn <br /> crcatcd in this area. Thc conswcted ��etland lics just �aest of thc <br /> , sitc, and Powdcr �till Gulch lics just�ccst of thc �cetland. <br /> t Preliminary Conditions Thc prc-dcvclopcd condition of thc L2 acre sitc is second gro��lh <br /> Summary forest with dcnsc undcrhrush. Run-off from thc sitc dnins to a <br /> constn�ctcJ «�ctlanJ adjacent ro tl�c ��csicrn boundary of thc sitc. <br /> ' ihis ��cdand drains to Po���dcr Mill Gulch, ��hich drains dircctly <br /> into Pugct Sound. <br /> ' Thc undcrlying soils arc classificd as sandy soil, ��'ith gooJ <br /> infiltration. For this renson, instaliatiun of Pcrmcablc Pavemcnt is <br /> proposed as a Stomnvatcr �9anagcmcnl mcasurc. l�hc infom�ation <br /> ohtaincd nbout thc undcrlying soils is from ProposcJ <br /> , ,14arnrjncJr�ring lJui/�lin�; Sernvny Lvrs 2.-i nnd 2Q providcd by <br /> Gcol?ngmcers and dated September 2(, 2001. <br /> tRunofT from uphill sitcs shcM �aws Crom Ihc castcrn boundary ar <br /> Off-Site Analysis <br /> ' through a roadsidc ditch North o( Scawa}' f31vd. RunofT is lhcn <br /> convc)'cd Ihrough .i constnic�cd wctland nnd in�o Po��'dcr Mill <br /> Gulch to thc \Vcst via thc s�id ditch. <br /> 1 <br /> ' ,C��mrm�C���ilerLo�1A —.S�nrniDrnina .•Rcw� ri&����T�oi��rie,�Aiai!i�!�n.,��Tia.r:�,�"i:����.7�-o;.,r�,�..�M�e�.- <br /> li'Rl�PncrRr. Inr .Im�e 19, 2007/Pngc 1 <br /> ' <br />