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PUBLIC HEALTH SERVICES ,oPa�IN <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. " <br /> Health Officer <br /> P.O. Box 2009 . (1601 East Hazelton Avenue) Stockton,California 95201 �gciFo,0.N�o <br /> (209) 468-3400 <br /> MAR 21 1991 <br /> DENVER ASSOCIATES I1 U 1 <br /> ENVIRONMENTAL DIVISION <br /> P O BQX 690-308 <br /> STOCKTON CA 95209 <br /> RE: DeRollo Mazda IN REPLY REFER TO SITE CODE: 1122 <br /> 308 N. Grant <br /> Stockton, CA 95202 <br /> We have reviewed the January 12, 1990 Preliminary Assessment Report. This office received the report on <br /> October 3, 1990. In November of 1989, three (3) soil borings were drilled, sampled, and analyzed for <br /> hydrocarbon contamination associated with leading underground fuel tanks at the above referenced site. <br /> Petroleum hydrocarbons were detected in soil from depths of 15 - 30' below ground surface. The highest <br /> levels of contamination are found in soil boring #3 (Tank A) at 30' depth (total petroleum hydrocarbons <br /> (TPH), 11,089.68 parts per million (ppm);benzene,215.21 ppm;toluene 979.67 ppm; ethylbenzene,279.82 <br /> ppm; and xylene 1358.82 ppm.) Contamination near tank B was measured at 15' below ground surface, <br /> (TPH, 470 ppm; benzene .05; toluene, 1.2 ppm, ethylbenzene, 1.9 ppm; and xylene, 18 ppm). <br /> Your consultant,WaterWork Corporation,proposes to excavate contaminated soil associated with the north <br /> end of Tank B, and install three (3) monitoring wells near Tank A to assess groundwater conditions. Once <br /> the groundwater gradient is determined, additional wells may be necessary to determine the extent of <br /> groundwater contamination in the areas of Tank A and B. <br /> A work plan to achieve these tasks should be submitted to San Joaquin County Public Health Services, <br /> Environmental Health Division, and to the Central Valley Regional Water Quality Control Board by April 22, <br /> 1991. <br /> If you have any questions, call Eleanor Ratliff, REHS, of my staff at (209)468-3454. <br /> Jogi Khanna .D., M.P.H. <br /> Health O c <br /> C <br /> eA la, RENS, Program anager <br /> nvironmental Health Division <br /> LAC/ER:nr <br /> c: CVRWQCB <br /> c: WaterWork <br /> 1710 Main St., Escalon, CA 95320 <br /> c: Charles Skobrak <br /> 9947 E. Hwy. 26, Stockton, CA 95205 <br /> A Division of San Joaquin County Healrh Care Services <br />