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LO PROJCCI' OVERVIE\V <br /> 'l�l�is projccl is a portion of the Seawap Busiticss Center situated on ihe soudieasl comer <br /> of Merrill Creek Parkway and Hardeson Road within thc Cily of L'verett, Washington. <br /> As such this project will cotnply witl� thc overall Master Drainage Plan, the Pinnl Stonn <br /> Drainage Rcporl for the Proposed Seaway Centcr dated October ]0, 2002, and the revised <br /> storm drainagc calculations datcd Octobcr 21, 2002, all previously submittcd and <br /> approved Uy the City of Gverctt. <br /> 1'his portion oCthc entirc Scaway Busincss Park will includc constn�ction of Building C <br /> and Building I'. The sitc work for Building G will consist ot'an approximately 99,150 <br /> square foot warehousc building and Building I�will consist of an approximately 47,050 <br /> squarc foot warchousc buiiding. Silc work for cach Uuilding will also consist of on gradc <br /> loading docks, drivc aislcs, parking, stonn drainage collcctiott systcr�� and utilitics. <br /> As stated in thc Pinal Drainagc Rcport, thc roof runoCC Gom I3uilding G and I3uilding P <br /> ���ill Uc divcrlcd to thc cxisting, combined infiltration/dctcntion pond to thc norlh of <br /> [3uilding P. The combincd infiltratiot�/detention pond was consWcted under the [3uilding <br /> G permit, ancl was sizcd to accommodatc thc roof nmoff from 13uilding G and I3uilding F. <br /> The combined inliltration/detention facility was sircd in propo�tion to thc roof area to Uc <br /> scrvcd. In accordancc with thc Ovcrall Mastcr Drainagc Pla!: ior thc cntirc Sca�vay <br /> I3usincss Park, approximatcly 11.43 acres will be di��crtect to an in(iltration/detention <br /> systcm to be discharged to the Giemvood Creek Drainage [3asin. I'cr thc Pinal Drainage <br /> Report and thc reviscd drainagc calculations, the required detention storage ��olume for <br /> lhc I 1.d3 acres is approximatcly 69,900 cubic Icct. Thc siring calculations for lhc <br /> infillration/dctcnlion facility assumcd roof arcas of 94,400 squarc fcct and 42,(50 square <br /> fcet for [3uilding G and [3uilding r respectively, �vhich is Icss than the actu.�l arcas, but <br /> also applicd a safety faclor of 1.41. Whcr� taking into uccount thc actual roof arcas of <br /> I3uilding L and Building P, ihc safcty factor Uccomcs 135 (scc attachcd sizing <br /> culculations.) In addition, the roof runoff from existing Buildiug U' will be di��crted <br /> around 13uilding P and into lhc: infillration/detcntion pond. <br /> 7'hc runoff gcncratcd from thc rcmaindcr of thc siie (i.e., parking, landscaping) will bc <br /> collected and com�cycd to the cxisting stom� drainage conveyance system �vhich <br /> discharges to the cxisting combined detention and ���ater quality pond located at the <br /> northwcst comer of Scaway [3usiness Center. A portion of the sitc drainage from <br /> cxisting Building G will bc divcrtcd around [3uilding � inf� thc existing stonn drainagc <br /> conveyance syslcm. Please see lhe attached convcyance calculations for the sitc <br /> convcynncc as ���cll as the roof com�cyancc. <br /> �I <br />