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T Corporation <br /> 4005 Port Chicago Highway <br /> Concord, CA 941520-1.120 <br /> the Te1. 925.288.9898 <br /> Fax.925.288.0888 <br /> rg'oup ,A II: 49 <br /> Sv <br /> A Member of The IT Croup <br /> *ENVIRONMENTAL HEALTH 01Vt$ION <br /> October 27, 1999 304 E Weber Ave.ThW Ftoor <br /> P.O. Box 388,StooaM CA g.12M-0Q88 <br /> selMatbn pemli <br /> Mr. Bob DeNinno A. Obtakft B Obtain �...,._..El7-Eleven, Inc. <br /> 10220 S.W. Greenburg Road 2 ROPOSIu.D e, <br /> Portland, Oregon 97233 3 REMARKSw <br /> Subject: Work Plan for Additional Site Assessment <br /> 7-Eleven Store No. 21756 Date_1117"751/7qy <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 /> 801518020. Analysis for methyl-tert-butyl ether(MTBE) and other oxygenates was performed using EPA <br /> Method 8260. <br /> 21756wkp.LTR <br />