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r G'orporadon <br /> 4005 Port Chicago Highway <br /> �IN i� . S Concord, CA 94,520-1120 <br /> t_G: ; %l,' Tel. 925.288.9898 <br /> ' <br /> the Fax.925.288.0888 <br /> � ��; �9 <br /> (4r,*Oup- A Aleml�er of The JT Croup <br /> *ENVIRONMENTAL HEALTH DIVISION <br /> October 26, 1999 304 E.WeberAMe.ThidFbW <br /> PO. Box 388,Sladdin CA *14= <br /> I PROPOSALAP 04MSUBJECTTO- <br /> Mr. Bob DeNinno A: Oar _13 <br /> 7-Eleven, Inc. B Ob Mw@l r ,3 ', <br /> 10220 S.W. Greenburg Road C Chaigenoted r E <br /> Portland, Oregon 97233 2 PROPOSAL DENIFJX -❑ <br /> D3 AEMAR Sw <br /> Subject: Work Plan for Additional Site Assessment r <br /> 7-Eleven Store No. 17647 <br /> 1048 W. Yosemite Avenue nate I� <br /> Manteca, California <br /> IT Corporation Project No. 781721 <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 October <br /> 26, 1999. The work scope includes collection of background information, the drilling and sampling of <br /> three soil borings, installation of monitoring wells in the borings, collection of groundwater samples from <br /> the monitoring wells, liquid level gauging of monitoring wells, and preparation of an assessment report <br /> summarizing the methods and results of the work performed. Details of the scope of work are described <br /> below. <br /> BACKGROUND <br /> On December 4 1998 two 10 000-gallon single-wall steel-under round stora- <br /> ge tanks (USTs) and one <br /> 6,000-gallon single-wall steel UST were removed.from the site. 'One soil sample was collected from <br /> beneath each end of each UST(for a total of six)from the base of the tank pit excavation at depths of 14 <br /> feet below grade. Two tank pit sidewall samples were also collected from depths of 6 feet below grade. <br /> All soil sampling was conducted at the direction of Mr. Harlin Knoll of the SJCEHD (IT Corporation, <br /> January, 1999). <br /> All soil samples collected during UST removal were analyzed for benzene, toluene, ethylbenzene, total <br /> j xylenes (BT.EX), methyl-tertiary butyl ether(MTBE), and total petroleum hydrocarbons as gasoline <br /> (TPH-G) by EPA Methods 8020/8015 modified, and for MTBE and other oxygenates by EPA Method 8260. <br /> 17647wkp.LTR <br />