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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY c <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> q <i ' oRN` <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202FILE C P <br /> 209/468-3420 <br /> GUARDINO AND CRAWFORD <br /> 517 FREMONT ST OCT 121999 <br /> STOCKTON CA <br /> Re: Guardino and Crawford Site Code: 1112 <br /> 517 W. Fremont St. <br /> Stockton, CA 95201 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has reviewed the Quarterly Report dated September 27, 1999 prepared by Advanced <br /> GeoEnvironmental, Inc. for the above referenced site. Soil and groundwater samples <br /> collected during the placement of four Monitoring Wells (MWs) at this site evidence <br /> contamination. Further soil and groundwater investigation will be necessary at this site. <br /> The deepest soil sample collected from the MW 1 boring at 35 feet below surface grade <br /> (bsg) evidenced Benzene, Toluene, Ethylbenzene and Xylene (BTEX) concentrations of <br /> .008 parts per million (ppm), .024 ppm, . 007ppm and .037ppm consecutively. The <br /> vertical extent of contamination has not been determined at this site. Vertical <br /> investigation of soil and water contamination below 30 feet bsg should be conducted in <br /> the location of MWI . <br /> Soil samples from boring #P4 (depicted on Figure 2 of the above report) were not <br /> analyzed and a boring log for P4 has not been submitted. Boring P4 appears to be the <br /> southernmost investigative data point.. Since conclusive data does not exist for the <br /> southern extent of soil and groundwater contamination at this site, it will be necessary to <br /> investigate this area to provide such data. <br /> BTEX contamination was evidenced in groundwater from all of the on-site MWs. In <br /> addition to BTEX, groundwater concentrations of Total Petroleum Hydrocarbons as <br /> gasoline (TPHg) were as high as 56,000 parts per billion (ppb) in MWl and 2,900ppb in <br /> MW2 . Methyl tertiary butyl ether (MTBE) was detected in groundwater from MW I and <br /> MW2 at 330ppb and l Ippb consecutively. The lateral extent of soil and groundwater <br /> contamination at this site has not been determined. <br /> Prior to the above investigation, conduct a complete well survey of domestic, municipal, <br /> agricultural, industrial and any other wells within a 2,000 foot radius of this site. Contact <br /> the Department of Water Resources, municipal water suppliers and nearby industries for <br /> well information. Perform a physical search of the area to identify any wells. Show the <br /> locations of all wells and submit any known construction details of the wells. Identify all <br /> sources of information in the well survey report. Provide a map that depicts each well <br /> A Division of San Joaquin County Health Care Services <br />