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r Ultramar <br /> Ultramar Inc. Telecopy: 209-564-6113 Credit&Wholesale <br /> P,O,Bax 466 209-583-3330 Administrative <br /> 525 W.Third Street 209-583-3302 Information Services <br /> Hanford,CA 93232-0466 209-583-3358 Accounting <br /> (282-0241 <br /> TeDruary 11, 1991 <br /> Ms. Eleanor Ratliff REHS <br /> San Joaquin County Public Health Services <br /> P 0 Box 2009 <br /> Stockton CA 95201 <br />` SUBJECT: BEACON STATION NO. 696, 800 EAST HIGHWAY 12, LODI, CA. <br /> Dear Ms. Ratliff: <br /> Enclosed for your review and files is a copy of our consultant's latest <br />+ investigation at the above-referenced Ultramar facility. The <br /> I investigation included the performance of vapor mapping and pilot testing <br /> as related to hydrocarbon concentrations in the soil beneath the site. <br /> As the data show, hydrocarbon concentrations in the soil are limited to <br /> the south central portion of the pjoperty. vapor concentrations from <br /> offsite wells show nondetectable hydrocarbon levels. Pilot testing shows <br /> a maximum lateral vapor capture radius of 110 feet with vertical influence <br /> of 64-1/2 feet. <br /> i <br /> Evax Technologies has been authorized to proceed with the design of an <br /> appropriate vapor extraction remediation w'system for. the site. We <br /> Y ill <br /> keep you informed of this project as it proceeds. <br /> Please do not hesitate to call if you have any questions regarding this <br /> information. <br /> Sincerely, <br /> i <br /> ULTRAMAR I <br /> Glenn R. embroff <br /> Marketing Environmental Department <br /> GRD/cvn <br /> Enclosure: Evax Project No. 02510.01 <br /> cc w/enc. : Mr. Gordon L. Boggs <br /> RWQCB-Central Valley Region <br /> 3443 Routier Rd Ste A <br /> Sacramento CA 95821-3098 <br /> BEACON <br /> A Member of the Ultramar Group of Companies #1 Quality and Service <br /> UHramar <br />