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l <br /> ❑�� RhL;EIVEIIGROUNDWATER <br /> ❑❑❑ TECHNOLOGY, INC. APR 2 6 11"P9 Lane,Concord,CA 94520 <br /> RQ NJ 4'4 F NIT,A' <br /> Ion c <br /> ft <br /> PERMIT/SERVICES (415)671-2387 <br /> April 23 , 1990 <br /> Job No. 203 175 3291 <br /> Mr. Steve Snyder <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Proposed additional soil excavation for Chevron Service <br /> Station No. 9-0557, located at 139 South Center Street, <br /> Stockton, California. <br /> Dear Mr. Snyder: <br /> This letter presents the details of the additional soil <br /> excavation proposed for Chevron Service Station No. 9-0557 <br /> located at 139 South Center Street in Stockton California. This <br /> letter is intended to amend and clarify the soil excavation <br /> section in the Work Plan for this site prepared by Groundwater <br /> Technology, Inc. in November, 1989. In that Work Plan, <br /> Groundwater Technology proposed to over-excavate, during tank <br /> removal, any soils that showed evidence of being impacted by <br /> adsorbed hydrocarbons. The excavated soil would then either be <br /> treated on site and used for backfill or legally disposed of off <br /> site. Since approval to over-excavate was not procured prior to <br /> tank removal, Chevron U.S.A. Inc. (Chevron) now wishes to secure <br /> permission to excavate soil containing adsorbed hydrocarbons from <br /> this site. <br /> The underground storage tanks were removed from this site on <br /> April 5, 1990. A Groundwater Technology field representative was <br /> on site to collect samples from beneath the tank, and from the <br /> piping trenches. Ms. Casey Folly of the San Joaquin County <br /> Health Department was also on site and she selected the sample <br /> locations and established the laboratory analyses that would be <br /> required. Copies of the analytical reports for the samples <br /> Offices throughout the U.S.,Canada and Overseas <br />