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Drainage Report—Revision 1 <br /> Boeing Everett-Rail Spur Parking Lot September 26,2013 <br /> QUICK REFERENCE PROJECT INFORMATION <br /> General Project Information <br /> Project Description Construction of a 104,823 SF parking lot with drainage <br /> improvements, including 1 StormFilter catch basin and 1 <br /> StormFilter vault. <br /> Project Address 3003 West Casino Road, Everett, WA <br /> Project Size Site= 197,473 SF (4.53 acres) <br /> Site Disturbance= 104,823 SF (2.41 acres) <br /> Owner/Developer The Boeing Company <br /> Attn: Russell Larmay <br /> Phone: (425) 931-4351 _ <br /> Consulting Engineer Erik Davido, P.E., LEED AP-Davido Consulting Group, Inc. <br /> 15029 Bothell Way NE <br /> Lake Forest Park, WA 98155 <br /> Phone: (206) 523-0024 <br /> Drainage <br /> Study Area Project limits as described above, and 1/4 mile downstream of the site. <br /> Drainage 1992 Department of Ecology Stormwater Management Manual for the <br /> Requirements Puget Sound Basin(hereafter referred to as the Stormwater Manual). <br /> • Source control and runoff treatment is required. <br /> Tributary Predeveloped Conditions: Redeveloped Conditions: <br /> Drainage Area Impervious Surface= 92,650 SF Total Impervious= 197,473 SF <br /> & Land Cover Pervious Surface= 104,823 SF PGIS = 197,473 SF <br /> Summary Total= 197,473 SF (4.53 Acres) Pervious Surface=0 SF <br /> Total= 197,473 SF (4.53 Acres) <br /> Soils Soils analysis by geotechnical engineer not completed for project. <br /> Offsite Analysis Downstream 1/4 mile from site. See Section 4 and APPENDIX F for <br /> results. <br /> Proposed • 4-Cartridge StormFilter Catch Basin <br /> Facilities • 8' x 11' StormFilter Vault w/(17)27"Tall StormFilter Cartridges <br /> • Type 1 and Type 2 Catch Basins with Spill Control (90-degree <br /> downturned outlets) <br /> Erosion Control An Erosion and Sediment Control Plan is required per Volume I, Chapter <br /> Measures I-2, Section I-2.5 of the Stormwater Manual. <br /> 20130926_Drainage Report Boeing Everett_Gate E-70 Parking lot_Revision 1.doc Page ii <br />