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PACIFIC <br /> ENVIRONMENTAL —-- -- —_— <br /> GROUP, INC S E_` 1 <br /> gg <br /> r <br /> AN®COMPANY <br /> March 17, 1999 °. <br /> Project 911-005 1 B <br /> APR 2 61599 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company P �-[ f r�ERV1C <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, CA 95661 <br /> Re Soil and Groundwater Investigation <br /> Tosco (Circle K) Store#1205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> Dear Mr Ralston <br /> This report,prepared by International Technology Corporation (IT, formerly Pacific <br /> Environmental Group, Inc ) on behalf of Tosco Marketing Company(Tosco), presents <br /> the results of the groundwater monitoring well installation at the site referenced above <br /> (Figures I and 2) The purpose of this work was to define the vertical and horizontal <br /> extent of gasoline hydrocarbons in soil and groundwater beneath the site The work was <br /> performed as outlined in the Workplan for Additional Site Assessment, dated June 10, <br /> 1998 and approved by Mr Mike Infurna of the San Joaquin County Environmental <br /> Health Division in his letter dated July 2, 1998 This report includes a brief discussion <br /> of site background, previous investigations, scope of work, and assessment of findings <br /> Field and laboratory procedures are presented as Attachment A Boring logs are <br /> presented as Attachment B Certified analytical reports,physical data, and chain-of- <br /> custody documentation are presented as Attachment C <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> The site is an active Circle K Facility located at 16420 Cambridge Street in Lathrop, <br /> California On November 10, 1997 three underground storage tanks (USTs), product <br /> dispensers, and associated product lines were removed from the site Approximately <br /> 1,241 tons of hydrocarbon-impacted soil were removed from beneath the USTs and in <br /> the area of the new UST pit and were transported to Forward Landfill in Manteca for <br /> disposal In addition, approximately 17,000 gallons of hydrocarbon-impacted <br /> groundwater was removed from the new UST pit and transported to a permitted facility <br /> for treatment <br /> 11315 Sunn5e Gold Circle, Suite M • Rancho Cordova,California 95742-6534 (916) 858-2350 FAX (916) 858-2355 <br />