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er, <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY a <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor- Stockton, CA 95N <br /> 209/468-3420 ' <br /> STEPHEN VALENTINE AUG 0 3 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 (PHS/EHD) has <br /> reviewed the"First Quarter 1998 Groundwater Monitoring Report" dated the June 23, 1998 <br /> prepared by Wm. J. Hunter&Associates for the above referenced site. The current water <br /> elevation is above the screened interval of all six monitoring wells (MW), including MW-4, MW-5, <br /> and MW-6 which until now had been below screen. Therefore the results of the analytical tests <br /> are most likely diluted. The analytical results of the water samples from all six MWs continue to <br /> indicate the presence of total petroleum hydrocarbon (TPH)as gasoline, and aromatic <br /> hydrocarbons as Benzene, Toluene, Ethyl-Benzene, and Xylenes (BTEX), with the water sample <br /> from MW-3 exhibiting the highest concentration. The oxygenate Di-isopropyl ether(DIPE)was <br /> found only in the water samples from MW-3 and MW-4 but had been detected in the water <br /> samples from all wells except MW-5 in the last quarterly sampling event. Analysis for Tertiary <br /> Butyl Alcohol (TBA)was not performed this quarter but this contaminant was found in the water <br /> samples from MW-3 and MW-4 collected during the last sampling event. MTBE has not been <br /> detected. <br /> PHS/EHD concurs with Wm J. Hunter&Associate's recommendation to reduce quarterly <br /> sampling of the monitoring wells to semi-annual basis. PHS/EHD disagrees with the <br /> recommendation to begin soliciting proposals for remediation at this time. The vertical extent of <br /> the contamination plume has not been defined. PHS/EHD recommended additional work to <br /> define the vertical extent of the contamination in a letter dated March 16, 1998. A proposal for <br /> corrective action is premature since the lateral and vertical extent of the contamination plume has <br /> not been defined. Submit a workplan to define the vertical extent of the contamination to <br /> PHS/EHD October 3, 1998. <br /> If you have any questions, please feel free to contact Jeffrey Wong at(209)468-0335. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> �"�- I- ,cr <br /> Jeffrey Wong, EHS, Trainee Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> JW:lb <br /> c: RWQCB, Central Valley Region -Mark List <br /> c: Wm. J. Hunter&Associates-Bill Hunter <br /> A Division of San Joaquin Councy Health Care Services <br />