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r- - Corporation <br /> 4005 Port Chicago Highway <br /> Concord, CA 94520-1120 <br /> r Tel. 925.288.9898 <br /> t; JA; ?: <br /> f l ax. 925.288.0888 j <br /> the - <br /> Ji' <br /> ' O,jj C, pr59 A Member of The IT Group <br /> v . <br /> October 17,2001 <br /> Mr. Bob DeNinno <br /> 7-Eleven, Inc. <br /> 3130 S. Owyhee Street <br /> Boise Idaho 83705 <br /> Subject: Workplan for Additional Assessment and Feasibility Testing <br /> 7=Eleven Site No. 17334 <br /> 4501 North Pershing Avenue <br /> Stockton, California <br /> IT Corporation Project 779950 <br /> Dear Mr. DeNinno: <br /> In accordance with the request of the San Joaquin County Public Health Services/Environmental Health <br /> Department(SJCEHD) (letter August 10,2001, received by IT Corporation September 25,2001),the <br /> following outlines proposed additional vertical/lateral assessment of dissolved methyl tertiary butyl ether <br /> (MTBE)and hydrocarbons at the referenced site (Figures 1 and 2,Attachment 1). In addition, proposed <br /> feasibility testing for remediation is discussed. As discussed with the SJCEHD,the original deadline for <br /> ( submittal of this workplan was revised from September 10,2001,to October 20,2001. <br /> WORKPLAN FOR ADDITIONAL SITE ASSESSMENT <br /> i <br /> Qualitative Risk Evaluation <br /> Sensitive Receptors <br /> Past reports on sensitive receptors indicate that there are no public water supply wells located within 4,000 <br /> feet downgradient of the site. The nearest crossgradient/upgradient water supply well is of unreported <br /> status and lies about 1,500 feet away. Therefore,this site is considered to be relatively low-risk to sensitive <br /> receptors. <br /> i <br /> i <br /> i <br /> I <br /> I <br /> I� <br />