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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r' <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> c�tl k'o"at'�r <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 Lq <br /> �10* "17 <br /> SRIKANTH DASAPPA <br /> USA PETROLEUM COMPANY OCT 121998 <br /> 30101 AGOURA CT #200 <br /> AGOURA HILLS CA 91301-4311 <br /> RE: USA PETROLEUM #65 SITE CODE: 1356 <br /> 2500 W LODI AVE <br /> LODI CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHSIEHD) has completed a recent review of the above noted site and offers the <br /> following comments. <br /> To date eight monitoring wells and two vapor extraction wells have been installed <br /> and sampled. Recent reports do not contain any of the soil data obtained from <br /> the borings prior to well construction. Please provide the analytical results for <br /> soil samples collected at these locations. <br /> The most recent report submitted to this office was prepared by GHH <br /> Engineering, Inc. and dated August, 1998. It contains groundwater data that <br /> represents an increase in gasoline constituents and MTBE concentrations in the <br /> groundwater in the area of the former single wall underground storage tanks <br /> (USTs) removed in October 1997. The analytical results of the water sample <br /> from S-1 were TPH-GAS 16000 ppb, Benzene 2300 ppb, Toluene 420 ppb, <br /> Ethylbenzene 280 ppb, Xylene 280 ppb, and MTBE 2900 ppb. <br /> GHH excavated soil from beneath the USTs at the time of their removal and <br /> collected confirmation soil samples at 16 to 20 feet below ground surface. <br /> Sample results from 3-EXC evidenced the highest degree of contamination.- <br /> TPH-GAS 8400 ppm, Benzene 15 ppm, Toluene 150 ppm, Ethylbenzene 100 <br /> ppm, Xylene 750 ppm, and MTBE 23 ppm. Soil samples P-8 and P-9 collected <br /> beneath the piping also evidenced high levels of contamination. The <br /> contaminated soil provides a continuing source for groundwater degradation. <br /> PHSIEHD does not approve the use of oxygen release compound as the sole <br /> remedial action at this site as proposed in the GHH report dated August 1998. <br /> A Division of San Joaquin County Health Care Services <br />