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. Cornerstone �7625•130"�Ave. NW, C102, Woodinville,WA 98072 <br /> � Geotechnical� InCi. Phone: 425-844-1977 <br /> Fax: 425-944-1987 <br /> Novcmber 18, 2002 <br /> Mr. Joc Yignataro <br /> c/o Project Scrvices <br /> 1429 Avenue D, #343 <br /> Snohomish, WA 98290 <br /> Geotechnical Iinginecring Report <br /> Proposed Ncw Storm Water Vault <br /> Northwest Mitsubishi <br /> Gverctt, Washington <br /> CG Filc No. 1397 <br /> Dear Mr. Pignataro: <br /> 7'his repori prescnts thc results of our subsurfacc invcstigation at your North�ccst 'v;�tsubishi <br /> dealership at 10G30 S2 99 in Gverett, Washington. <br /> INTRODUCTION <br /> You have reque,ted that ���e complete a gcacchnical report to evaluate site conditions in the <br /> southwest corncr of the site and provide rewmmendations for construction of a planned stortn <br /> water vault in that arca. The site is located at 10G30 SR 99 just south of the intersection of <br /> Evergrecn �Vay and SI: Everett Mall Way,as shown on thc Vicinity Map in Figure l. <br /> Por our use in preparing this report, �vc have been provided �vith a site plan prepared by Kegcl & <br /> Associates (Kegcl) datcd 1990, and a Ihainage I�acility Revision plan prepared by David Evans <br /> R Associates (DGA) dated Septcmher 2002. The vault is planned as a wet vault with permanent <br /> watcr storagc. <br /> You propose to place thc storni ���ater vault in an existing stomi water swale area. Currently the <br /> water is routed through an oilhaater separator and then through a roughly 100-foot-long and 30- <br /> foot-�aide "U" shaped s���ale out to a manhole at the southwest curner of the site. The I6-Poot- <br /> wide and 49-foot-long vault will hr�ve a concrete botlom and concr:.te lid. There is G feet oC <br /> ��� <br />