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i <br /> �1 <br /> PUBLIC Hi�ALTH SERVIC °iS <br /> SAN JOAQUIN COUNTY <br /> EE " a <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 FILE <br /> LORI SHIELDS <br /> DIESEL PERFORMANCE SEP 0 91999 <br /> 2804 EAST FREMONT STREET <br /> STOCKTON CA 95205 <br /> RE: Diesel Performance SITE CODE: 1120 <br /> 2804 Fremont Street <br /> Stockton CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) <br /> has reviewed the "Monitoring Report Third Quarter 1999" dated August 26, 1999 that <br /> was submitted by ATC Associates, Inc. (ATC) on behalf of the above referenced site and <br /> has the following comments. <br /> On September 25, 1998 one groundwater monitoring well (MW-1) was installed on site. ' <br /> Three groundwater monitoring events have occurred since that time. Analytical results <br /> from these events have evidenced increasing levels of petroleum hydrocarbon <br /> contaminant impact to groundwater. The most.recent results,.from groundwater <br /> samples collected on July 8, 1999, were 5,200 parts per billion (ppb) total petroleum <br /> hydrocarbons as gas (TPHg), 2,970-ppb TPH kerosene, 3,000-ppb TPH diesel, 292-ppb <br /> benzene and 48-ppb methyl tertiary butyl ether.. <br /> Further investigation is necessary at this site. Please prepare a work plan to complete <br /> the definition of the vertical and lateral extent of the contaminant plume in groundwater. <br /> Routine monitoring of MW-1 should continue. <br /> If you have any questions or comments please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> k Lori Duncan, REHS Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> Jeanne Homsey, ATC <br /> A Division of San Joaquin County Health Care Services <br /> r <br /> a <br /> :.i <br />