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' Drainage Report <br /> Boeing Everett-E-6 Parking Lot Expansion July 16,2013 <br /> QUICK REFERENCE PROJECT INFORMATION <br /> General Project Information <br /> ' Project Description Expansion of an existing 54,320 SF parking lot to add 51,141 SF of <br /> asphalt parking lot for employee parking. The project will include <br /> ' <br /> submittal <br /> water requManagementirements asManua stipulatedl. in the 2010 City of Everett <br /> Project Address 3003 W Casino Rd, Everett, WA 98203 <br /> Project Size Site= 113,269 SF (2.60 acres) <br /> Site Disturbance=58,949 SF (1.35 acres) <br /> Owner/Developer The Boeing Company <br /> Attn: Russell Larmay <br /> Phone: (425) 931-4351 <br /> Consulting Engineer Erik Davido, PE,LEED AP <br /> Davido Consulting Group, Inc. <br /> 15029 Bothell Way NE, Suite 600 <br /> Lake Forest Park,WA 98155 <br /> Phone: (206) 523-0024 <br /> ' Drainage <br /> Study Area Project limits as described above. <br /> Drainage 2010 City of Everett Stormwater Management Manual (which is <br /> Requirements hereafter referred to as the Stormwater Manual). <br /> ' • Flow control and water quality facilities are not required. See <br /> exemption details in Sections 8.4 and 8.5 of this report. <br /> Tributary Predeveloped Conditions: Redeveloped Conditions: <br /> ' Drainage Area Impervious Surface = 54,320 SF Total Impervious = 105,461 SF <br /> & Land Cover Pervious Surface= 58,949 SF New Impervious Surface= 51,141 SF <br /> Summary New PGIS = 51,141 SF <br /> t Soils Total= 113,269 SF (2.60 Acres) Total= 113,269 SF (2.60 Acres) <br /> Areas of fill (mostly over utilities along the west side of the expansion) <br /> underlain by dense glacial till. No groundwater was encountered during <br /> the investigations. <br /> Offsite Analysis See Section 8.1 for details of the downstream system. <br /> Proposed • Type 1 and Type 2 catch basins with spill control elbows. <br /> ' Facilities <br /> Erosion Control TESC plan required per the Stormwater Manual. <br /> Measures <br /> 1 <br /> I <br /> 20130715_Drainage Report_Boeing Everett_Gate E-6 Parking Lot.doc Page ii <br /> 1 <br />