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�1 t <br /> uitramar <br /> Ultramar,Inc. f,s[ T T Telecopy: 209-585-5685 Credit <br /> P.O.Box 466 .f ', t a s r 209-583-3330 Administrative <br /> 525 W.Third Street 209-583-3302 Information Services <br /> Hanford,CA 93232-0466 209-583-3358 Accounting <br /> (209)582-0241 <br /> June 14, 1996 <br /> Mr. Mike Infurna <br /> San Joaquin County <br /> Environmental Health Department <br /> 445 North San Joquin Street <br /> Stockton, California 95201 <br /> SUBJECT BEACON ST.:F1ON TATO. 641.1, 12101 EAST HEiIMiv ER LANE, <br /> STOCKTON, CALIFORNIA <br /> Dear Mr. Infurna: <br /> This correspondence is provided as per our telephone conversations of today <br /> and yesterday. As we discussed, Ultramar will install 16-inch PVC conductor <br /> casings.in selected locations within the UST area at the above-referenced <br /> Ultramar facility. _The casings will allow drilling activities to be conducted in the <br /> UST area to assess the vertical extent of gasoline hydrocarbon impacted soil. In <br /> addition to the casings, we propose to_install water, electrical;and air PVC <br /> conduits to five of the casings to allow for vapor/ground-water extraction and <br /> air sparging if remediation becomes necessary. Installation of remediation <br /> equipment is not proposed at this time. <br /> The casings will be located in the UST area as depicted on the enclosed drawing. <br /> A total of ten casings are proposed. Five of the casings will be used for <br /> assessment borings and possible remediation equipment, and five casing will be <br /> used for confirmation borings at a later date. A well box will be installed to the <br /> east of the west fuel islands. This box will allow for drilling activity to assess the <br /> lateral extent of impacted soil east of the UST area. No casing will be installed in <br /> this box. Due to the installation of the west canopy over the east ends of the <br /> former UST's, it will be necessary to perform drilling activities in this area <br /> during the UST replacement project. A detailed workplan outlining all of the <br /> proposed drilling activity is being prepared and will be delivered to you for <br /> your review. <br /> To accommodate the contractor's schedule for the UST project, it will be _ <br /> necessary to perform the drilling activities by July 10, 1996. Therefore, the <br /> workplan will be delivered to you, by June 20, 7.996. Upon your review of the' <br /> workplan, please provide a response by June 27, 1996. <br /> BEACON <br /> A Member of the Ultramar Group of Companies #1 Quality and Service <br />