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T Corporadon F <br /> 4005 Port Chicago Ilighways <br /> Concord, CA 94520-1120 <br /> Tel. 925.288.9898 <br /> theFax. 925.288.0888 <br /> V <br /> � 0UP- I j G 1 Member of The IT Group <br /> ser 7 <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.20632 <br /> 4627 DaVinci Drive <br /> Stockton, California <br /> IT Corporation Project 779962 <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 /> Qualitative Risk Evaluation <br /> Sensitive Receptors <br /> Past reports on sensitive receptors indicate that there are no public water supply wells located within one <br /> mile downgradient of the site. Therefore,this site is considered to be relatively low-risk to sensitive <br /> receptors. <br /> Lateral and Vertical Plume Delineation <br /> One downgradient groundwater monitoring well and a replacement for abandoned well MW-4 (well MW- <br /> 4R) are proposed to be installed as shown on Figure 2. The wells are proposed to be installed to 15 feet <br /> below grade,screened from 5- 15 feet below grade. <br /> The location of the downgradient well.is proposed to be between 50 and 100 feet southwest of well MW-2 <br /> (access permitting and without installing the well too close to the Mokelumne Aqueduct). <br />