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PUBLIC !!TEALTH SERN/',-rCES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION h y� <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 1 }�',A...Ri`� <br /> 209/468-3420 i 1 <br /> LORI SHIELDS `SPR 2 0 � <br /> DIESEL PERFORMANCE INC <br /> 2804 EAST FREMONT AVE <br /> STOCKTON CA 95205 <br /> Re: Diesel Performance Site Code: 1120 <br /> 2804 East Fremont Ave <br /> Stockton CA 95205 <br /> Dear Ms. Shields, <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> prepared a summary of information pertaining to the remaining contamination that is <br /> associated with the operation of the former underground storage tank, for your consideration. <br /> On February 4, 1987, PHS/EHD issued a permit to remove the former 3,000 gallon gasoline <br /> underground storage tank. The soil sample which was collected at approximately 13 feet below <br /> ground surface on February 20, 1987, evidenced the following concentrations (noted in ppm): <br /> Benzene Toluene Xylene EDB Gasoline Diesel Kerosene Oil <br /> 0.13 2.3 9.7 <.01 131 120 1,400 <20 <br /> Based on seasonal high groundwater in the area of the site, 45 feet below ground surface, <br /> additional investigation will be necessary to determine the extent of the contamination and the <br /> potential threat which the remaining contamiantion poses to groundwater. <br /> Please submit a work plan by June 22, 1997 that includes a proposal for a minimum three soil <br /> borings, installed using either hollow stem auger drilling or push-point technology, to <br /> determine the vertical and horizontal extent of the contamiantion that has been evidenced. As <br /> we discussed during the April 15, 1997 meeting it will not be necessary to excavate the former <br /> tank area to obtain this preliminary information. <br /> If you have any questions, please do not hesitate to contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: Elizabeth Thayer, CVRWQCB <br /> A Division of San Joaquin County Health Care Services <br />