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IT Corporation <br /> 4005 Port Chicaco Flichw-�v <br /> i Concord, Cit 91,520-1120 <br /> - Tel. 925.288.9898 <br /> Far.925.288.0888 <br /> the <br /> (4r,*Oup- <br /> _ - �, 1 A Member of The IT Croup <br /> *ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Wei AVG.Third FbW <br /> October 27, 1999 P.O. Box 388.S'kK0dM CA SM-0388 <br /> 1 PROPOSAL APPROVED SUBJECT TOr <br /> A ObU*ft ssrtIM111 POW* ❑ <br /> Mr. Bob DeNinno 9 ObtSrlMlell/pUsTIPPO <br /> 7-Eleven, Inc. C CRanpe itloaE�+ ❑ <br /> 10220 S.W. Greenburg Road 2 PROPOSAL D I w G <br /> Portland, Oregon 97233 3 RE <br /> Subject: Work Plan for Additional Site Assessment <br /> 7-Eleven Store No. 21756 Date 11.71 py <br /> 853 E. Yosemite Avenue <br /> Manteca, California <br /> IT Corporation Project No. 781723 <br /> Dear Mr. DeNinno: <br /> IT Corporation submits this letter as a work plan for an additional site investigation at the subject site <br /> (Figure 1 and 2, Attachment 1). This scope of work is presented in response to a telephone conversation <br /> with the San Joaquin County Public Health Services Environmental Health Division (SJCEHD) on <br /> October 26, 1999. The work scope includes collection of background information, the drilling and <br /> sampling of three soil borings, installation of monitoring wells in the borings, collection of groundwater <br /> samples from the monitoring wells, liquid level gauging of monitoring wells, and preparation of an <br /> assessment report summarizing the methods and results of the work performed. Details of the scope of <br /> work are described below. <br /> BACKGROUND <br /> On December 9, 1998, three 10,000-gallon steel single-wall underground storage tanks (USTs)were <br /> removed from the site (IT Corporation, January 1999). Six soil samples were obtained from the base of <br /> the UST pit, and two soil samples were obtained from beneath the pump islands and associated fuel <br /> dispensing piping. Tank pit soil samples were collected from about 14 feet below grade; pump island area <br /> samples were obtained from depths of about 4 feet below grade. <br /> All soil samples were analyzed for benzene, toluene, ethyl-benzene, xylenes (BTEX), total petroleum <br /> hydrocarbons as gasoline (TPH-G), and total petroleum hydrocarbons as diesel (TPH-D) by EPA Methods <br /> 8015/8020. Analysis for methyl-tert-butyl ether(MTBE) and other oxygenates was performed using EPA <br /> Method 8260. <br /> 21756wkp-4TR <br />