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ti <br /> u <br /> Ultramar <br /> Ultramar Inc. Telecopy: 209-584-6113 Credit&Wholesale <br /> P.O.Box 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 /> (209)582-0241 <br /> April 23, 1991 <br /> Ms. Laurie Cotul 1 a APR $ Rr„ <br /> San Joaquin County Local Health District <br /> Environmental Health Division ENVIRONMENTAL HEALTH <br /> P. 0. Box 2009 PER MIT/SERVICES <br /> Stockton, CA 95201 <br /> SUBJECT: BEACON STATION NO. 492, 470 NORTH MAIN STREET, MANTECA, CA. <br /> Dear Ms. Cotulla: <br /> Enclosed for your review and files is a copy of our consultant's FOURTH <br /> QUARTER 1990 QUARTERLY GROUND-WATER MONITORING REPORT for the <br /> above-referenced Ultramar facility. In addition, we have received your <br /> letter of April 18, 1991 regarding the above-referenced site. We have <br /> several questions regarding your request for an additional investigation <br /> of this facility. <br /> In your letter you reference a May 25, 1989 letter from the Central Valley <br /> Regional Water Quality Control Board requesting a work plan for further <br /> investigative work. We have reviewed our files and have found that this <br /> May 25th letter was never received by Ultramar. Your letter also mentions <br /> that the lateral and vertical extent of both soil and ground-water <br /> contamination have not been confirmed. This is puzzling as we are not <br /> aware of any regulatory agency requiring delineation beyond 2.4 parts per <br /> billion dissolved benzene in ground water and previous soil analyses <br /> document the extent of soil contamination. <br /> Your April 18th letter also mentions that the three monitoring wells at <br /> our site appear to be located too close to each other to determine the <br /> ground water gradient. Again, this is the first time a regulator has <br /> requested well spacing greater than 60 ft. in order to show that the site <br /> does indeed have a measurable site gradient. <br /> Because of our concerns with your request for a work plan, we are formally <br /> requesting, through this letter, a meeting with a representative of the <br /> San Joaquin County Public Health Services Group and a member of the <br /> California Regional Water Quality Control Board to discuss this project <br /> and the need for further activity at the site. Until such a meeting is <br /> held, we do not plan to prepare a work plan and unfortunately will not be <br /> able to meet your June 1, 1991 deadline. <br /> •:: <br /> BEAC <br /> A Member of the Ultramar Group of Companies S1 Quality and Service <br />