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PUBLIC HtALTH SERVI S <br /> SAN JOAQUIN COUNTY N <br /> ENVIRONMENTAL HEALTH DIVISION .. <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> GEORGE AND MEI TERANISHI SEP 081999 <br /> 1600 WEST DURHAM FERRY RD <br /> TRACY CA 95376 <br /> Re: George's Service <br /> Site Code: 1550 <br /> 1600 West Durham Ferry Rd. <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has reviewed the Groundwater Monitoring Report dated August 12, 1999 prepared by <br /> Geological Technics Inc. for the above referenced site. Further investigation and <br /> remediation of groundwater and soil contamination at this site will be necessary. <br /> Six of the 12 Monitoring Wells (MWs) at this site evidence petroleum contamination in <br /> the groundwater. Two of the six impacted MWs show an increase of petroleum <br /> contaminants in groundwater since the previous Quarterly Monitoring (QM)event. The <br /> contaminant plume does not appear to be decreasing. <br /> Water collected from a domestic well at this site evidenced 0.37 parts per billion (ppb) <br /> Benzene in groundwater during the second quarterly sampling event of 1999. This <br /> domestic well should be resampled to confirm the Benzene contamination during the next <br /> QM event. PHS/EHD recommends collecting the sample with a bailer through an <br /> opening in the well head. Any floating petroleum product should be removed prior to <br /> sample collection. If contamination is verified PHS/EHD strongly recommends that the <br /> water from the domestic well not be used for drinking or bathing. Construction details <br /> for this well should be obtained and submitted to PHS/EHD. If no construction details <br /> are available the well should be investigated by a qualified professional to obtain well <br /> construction information. This well should be clearly labeled and identified on the well <br /> survey map. All site wells should be shown on QM maps along with clearly indicated <br /> previous Underground Tank locations. <br /> Pumping tests should be conducted on the affected domestic well to determine its <br /> pumping influence on the gradient and the contaminant plume. The potential for <br /> contaminant plume migration should be evaluated based on solid hydrogeological data. <br /> Soils from relevant lithological units should be analyzed for permeability,bulk density, <br /> moisture, porosity, and organic carbon content. It may be necessary to conduct well <br /> drawdown tests and calculate the radius of influence of on site wells. Pending the <br /> findings in regards to the migration potential of the contaminant plume, mitigation <br /> A Division of San Joaquin County Health Care Services <br />