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DRAINAGE CONTROL CALCULATIONS <br /> May 17, 1995 <br /> Pmicct: Cobalt Officc L�uilJing <br /> Job No. 176-20 <br /> Address: 3519-3525 Colby A��cnuc <br /> E��crott,W:uhington <br /> O�vnc . Thc Cobalt Gmup <br /> P.O. F3o� 488 <br /> Evcrctt,Washington 98306-0488 <br /> [.c�a ; Lots 10, 1 l, ]2, 13 and 14, block 7, Friday's First Addition to Evcrctt, <br /> according to thc plat thcrcof filcd in Volume 3 0(plats, pagc 3A, Rewrds <br /> of Snohomish Counry, Wnshington; <br /> E�ccpt thc���est 15.00 fcct thcrcof for roads; <br /> Subjcct to casemcnls, rights,covcnanls and condilions of rccord, if any. <br /> L.<�i Arca: 14,192 squarc Iccl, ur 0.3258 acres <br /> E�itiline Conditions: <br /> The wcstcm porlion of the esisting sitc is currcntly occupicd by thrcc one-story wood <br /> fmmc houscs, cach ���ith a partial basemcnt. The caslcrn half of thc sitc slopcs stceply to <br /> thc cast and is ovcrgro�vn with brush and debris. Thc site is bordcred on the west by <br /> Colby A��enue and on thc cast by a gravel allcy. There is an cxisting condominium <br /> building to thc soWh and lo the north is an unJcvcloped property covcred with brush. The <br /> sitc topogr�phy slopcs to dic cast tu thc csisting allcy. <br /> Therc is an existing 6-inch sanilai��se�vcr in Colby A��enuc. Accarding to Kirk Brooks at <br /> thc Evcrcll Public Works Dcparlmcn�, this sc��•cr linc is at or ncar capaciry. Thcre is an <br /> cxisting S-inch combincd sca�cr in Wcunorc A�•cnuc lixatcd cas[of the allcy. Thcrc is also <br /> an cxisling 8-inch stonn d�:�in in Ihc norU7crn murgin of 36th Strcct, south of thc sitc. <br /> Thcrc docs not appcar to bc a significant amount of ofLsite drainage contributing to thc <br /> si1c. <br /> Dc��cl�d Conditions: <br /> The existing buildings ���ill bc dcmolishcd and a new office building and asphalt parking <br /> arca ���ill bc constructed on thc sitc. Thc building ���ill vary from one t� thrce storics. <br /> Parking will be pro�;ded un the southcrn half of Qic sitc and along the allcy. Therc will be <br /> a 25 R�ol���idc dri��c���ay acccss al thc sou�h���cst corncr of Ihc site off of Colby A��cnuc. <br /> Thc omsilc drainagc from thc nc���ly dc��clopcd arcas �vill bc collccted nnJ dischargcd to a <br /> nc�v 8-inch stonn dr�in in ihc allcy. This stonn dr.�in will run souih �0 36ih Strcet and thcn <br /> casl lo a poinl ���hcrc thc nca� Jrainagc syslcm �vill connccl lu thc cxis�ing 8-inch storm <br /> Pagc 1 of 6 <br />