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PUBLIC HtALTH SERVICtS <br /> SAN JOAQUIN COUNTY <br /> Q: <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 a�rFORa <br /> 2091458-3420 FILE,- C <br /> LORI SHIELDS <br /> DIESEL PERFORMANCE INC MAR _ 41999 <br /> 2804 EAST FREMONT STREET <br /> STOCKTON CA 95205 <br /> RE: DIESEL PERFORMANCE, INC. SITE CODE: 1120 <br /> 2804 EAST FREMONT STREET <br /> STOCKTON CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Summary Report of Additional Subsurface Investigation", dated <br /> January 8, 1999, which was prepared by ATC Associates, Inc. for the above <br /> referenced site and has the following comments for your consideration and action. <br /> The report details the work that was done at the site on Sept. 25, 1998 to further <br /> evaluate the vertical extent of hydrocarbon contamination in soil and possible impact of <br /> contamination to ground water. One soil boring was advanced by hollow stem auger to <br /> approximately 65 feet below surface grade (bsg) and completed as a ground water <br /> monitoring well. During the drilling, soil samples for analysis were collected every five <br /> feet. The well was developed and a ground water sample collected on Sept. 28, 1998. <br /> Analytical results from the soil samples evidence that hydrocarbon contamination <br /> extends to at least 45 feet bsg, and appears to attenuate by 65 feet bsg. No oxygenate <br /> fuel additives were reported in any soil samples analyzed, but the method detection <br /> limits used were very elevated. Analytical results from the water sample evidence that <br /> contaminant impact to groundwater has occurred. <br /> Please initiate quarterly groundwater monitoring at this site. Following receipt of data <br /> from the monitoring events, further evaluation of the site can be made. <br /> If you have any questions or comments please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, RENS, Director _ <br /> Environmental Health Division <br /> Lori Duncan, RENS Margare�agorio, REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> Jeanne Homsey, ATC Associates, Inc. <br /> A Division of San Joaquin County Health Care Services <br />