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PUBLIC HEALTH StRVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> l�� Karen Furst, M.D., M.P.H., Health Officer . <br /> AUG 141998 <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 95202 <br /> 209/468-3420 <br /> C(DFY <br /> STEPHEN VALENTINE -MAR 16 1998 <br /> STEVE & GENES SERVICE <br /> 6232 HEMET AVE <br /> STOCKTON CA 95207 <br /> RE: STEVE & GENES SERVICES SITE CODE: 2080 <br /> 2315 N EL DORADO ST <br /> STOCKTON CA 95204 <br /> The San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Fourth Quarter 1997 Groundwater Monitoring <br /> Report" dated the 13th of February 1998, and the "Interim Report Covering <br /> Results of the Strataprobe Work" dated November 1997 prepared by Wm. J. <br /> Hunter & Associates for the above referenced site. <br /> The current average water elevation is above the screened interval of monitoring <br /> well (MW) 1, MW-2, and MW-3, but below the screened interval of MW-4, MW-5, <br /> and MW-6. The results of the water samples from all six MWs indicate the <br /> presence of total petroleum hydrocarbon (TPH) as gasoline, and aromatic <br /> hydrocarbons as Benzene, Toluene, Ethyl-Benzene, and Xylenes (BTEX). The <br /> presence of oxygenates as Di-isopropyl ether (DIPE) was found in all wells <br /> except MW-5, and as Tertiary Butyl Alcohol (TBA) was found in MW-3 and <br /> MW-4. No MTBE was detected. Lab data from the samples of MW-3 where the <br /> center of the plume is suspected to be located, continues to indicate the highest <br /> concentration of TPH and BTEX contamination. However, there was a strong <br /> increase in concentration of contamination according to the lab results from <br /> MW-4, which is upgradient of the suspected plume center. <br /> The soil probe work performed the 291h of September, the 30th of September, and <br /> the 8`h of October 1997 did not determine the horizontal and vertical extent of the <br /> contamination. The PHS/EHD recommends the vertical extent of contamination <br /> on site be defined first; this will guide the lateral and vertical investigation off site. <br /> In addition to repeatable points such as MWs, you may want to consider <br /> continuous core sampling which will yield a more detailed picture of the plume. <br /> A Division of San Joaquin County Health Care Services <br />