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N PUBLIC hEALTH SERVICES <br /> OP.4UTA!. C <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION " < <br /> Karen Furst, M.D., M.P.H., Health OfficerMD <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9 <br /> 209/468-3420 R s 1995 <br /> GUARDING AND CRAWFORD <br /> 517 FREMONT ST, <br /> STOCKTON, CA 95201 <br /> Site Code: 1112 <br /> Re: Guardino & Crawford, 517 Fremont St., Stockton, CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has reviewed the <br /> "Preliminary Investigation and Evaluation Report" dated September 15, 1997, prepared by Advanced <br /> GeoEnvironmental, Inc. The vertical and lateral extent of the petroleum contamination at this site still has not been <br /> defined. <br /> Soil samples taken at 25 feet below grade (see P-3 , Table 1) indicate total petroleum hydrocarbons (TPH) as <br /> gasoline at 1 .2 parts per million (ppm), toluene at .017 ppm, ethyl benzene at .010 ppm, and xylene at .067 ppm. <br /> Twenty five feet below grade is the deepest soil investigated and contaminants were present. It is unknown how <br /> much deeper the contamination extends. Soil samples were collected and analyzed from soil probes P4 , P-2, P-5, <br /> P-6 and P-7, to investigate the lateral extent of contamination. Until the vertical extent of contamination in the <br /> source area is defined the lateral area cannot be defined. <br /> Water samples were obtained and analyzed from the probes. Sample results from P4 , P-5, P-6, P-7 and P-8 all <br /> evidenced groundwater contamination. <br /> Further investigation is necessary at the above referenced site to determine the lateral and vertical boundaries of the <br /> contamination. PHS/EHD agrees with Advanced GeoEnvironmental's recommendation to further investigate the <br /> site. A minimum of three monitor wells should be installed. Soil investigation is required to extend to a depth of at <br /> least 40 feet below grade ( 1978 groundwater depth as per San Joaquin County Flood Control and Water <br /> Conservation District Map). Once the vertical extent of contamination is determined in the source area, the lateral <br /> investigation should be completed to accurately establish limits of contamination. <br /> A survey of domestic, municipal, agricultural and other wells within 2000 feet of the site should be conducted. This <br /> includes reviewing records at the Department of Water Resources, PHS/EHD, City of Stockton and performing a <br /> physical survey of the area. This survey must be included in the work plan to install monitoring wells at the site. <br /> Analysis for oxygenates in the soil and groundwater samples collected in the future should be included. The work <br /> plan should be submitted by May 1 , 1998. <br /> If you have questions regarding this letter contact Carol Oz, Senior REHS, (209)468-3440. <br /> Donna Heron, REHS, Director <br /> Environmental Health Division <br /> Carol Oz, Senior REHS Margaret ffagorio, RERS <br /> Site Mitigation Unit Supervisor V <br /> cc: William Little, AGE <br /> Pat Anderson, CVRWQCB <br /> A Division of San Joaquin Counhr Health Care Services <br />