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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> _ `�1&'—` ? Donna K.Heran,R.E.H.S. Unit Supervisors <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director <br /> ` alifornia 9`J 202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> AlAI Olsen,R.E.H.S. Stockton, Douglas W.Wilson,R.E.H.S. <br /> L`'qC/FORa�P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 <br /> Mark Barcellos,R.E.H.S. <br /> LOLLY BOZZANO SEP 1 2003 <br /> 2891 ARATA RD <br /> STOCKTON CA 95215 <br /> RE: Three Palms Grocery SITE CODE: 1830 <br /> 6732 Hwy 88 <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed "First Quarter <br /> 2003 Groundwater Monitoring Report" dated June 26, 2003, prepared by ATC Associates Inc. <br /> for the above referenced site. Low levels of Total Petroleum Hydrocarbons as gasoline (TPH- <br /> g), Benzene, Toluene, Ethyl Benzene and Toluene (BTEX) continue to be detected in the <br /> groundwater samples from monitoring well MW1. In addition, analysis for 1,2-DCA that was <br /> initiated in November 2001, has confirmed that contaminant in the groundwater samples from <br /> MW1 and MW3. The maximum contaminant level (MCL) for 1,2-DCA in public drinking water is <br /> .5 ug/I. The levels of 1,2-DCA in the groundwater at this site exceed the MCL. There is a <br /> drinking water well within 100 feet of MW3 that must be protected from these contaminants. <br /> A Closure Report for this site was prepared by ATC Associates Inc. in 2001. EHD reviewed that <br /> report and discussed the contents with the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB). It was decided that more information was needed. CVRWQCB staff felt that the <br /> mass of contamination remaining in the soil was higher than the mass calculated in the report <br /> and that the feasibility of vapor extraction should be evaluated to remediate the contamination <br /> remaining in the soil that could continue to be a source of contaminant impact to the <br /> groundwater. Also analysis for 1,2-DCA was requested. The 1,2-DCA impact to groundwater <br /> provides additional concern and warrants further investigation of this site. <br /> Submit a work plan to investigate the lateral and vertical extent of the contamination at this site <br /> and to evaluate remedial alternatives for cleanup of the site by November 3, 2003. Also initiate <br /> and continue quarterly sampling and analysis of water samples, monitoring and reporting of site <br /> information until this site has received a no further action determination from EHD and <br /> CVRWQCB. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> —7-yl� ;n� <br /> Margaret Lagorio, Supervising REHS <br /> LOP/Unit IV <br /> c: ATC - Jeanne Homsey <br /> CVRWQCB –Jim Barton <br />