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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Q: Donna K.Heran,R.E.H.S. <br /> W - 304 East Weber Avenue Third Floor Carl Borgman,R.E.H.S. <br /> 4 Director� Mike Huggins,R.E.H.S.,R.D.I.AI Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> ' <br /> e4 •.. Program Manager <br /> �'FOR� Laurie A.Cotulla,R.E.H.S. Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 <br /> Program Manager Robert McClellon,R.E.H.S.Mark Barcellos,R.E.H.S. <br /> LOLLY BOZZANO DEC 3 0 2001, <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 "Summary Report of <br /> Supplemental Subsurface Investigation" dated October 18, 2004, prepared by ATC Associates Inc. for the <br /> above referenced site. The laboratory analytical data has not been electronically submitted to the <br /> Geotracker web site for the investigation documented by this report, the data should be submitted to <br /> Geotracker immediately. EHD does not concur with ATC's recommendation of no further action for the <br /> site. <br /> The monitoring wells were dry in July 2004. The results of the water samples collected in April 2004 <br /> show that Total Petroleum Hydrocarbons as gasoline (TPH-g), Toluene, Xylene and 1,2-DCA continue to <br /> be detected in the groundwater samples from monitoring well MW1. The contaminant 1,2-DCA was <br /> again detected in the groundwater sample from MW3 in April 2004. <br /> Contaminants were not detected in the water sample from GP3 at 100 feet below grade that was drilled in <br /> May 2004 and is upgradient of the former underground storage tank (UST) location. Contaminants were <br /> not detected in the water samples from CPT2 at 94 and 132 feet below grade that was drilled in April <br /> 2004 and is downgradient of MW3. Contaminants were detected in the water samples from CPT1 at 90 <br /> and 123 feet below grade that were collected in March and April 2004 and is close to the former UST <br /> location. The existing monitoring wells were installed to a total depth of 91 feet and are currently dry. At <br /> least one monitoring well screened in a sand interval below 120 feet should be installed downgradient of <br /> the former UST location to investigate the deeper hydrological unit. <br /> The Central Valley Regional Water Quality Control Board (CVRWQCB) staff previously stated they felt <br /> that the mass of contamination remaining in the soil was higher than the mass that ATC had calculated <br /> and that the feasibility of vapor extraction should be evaluated to remediate the contamination remaining <br /> in the soil that could continue to be a source of contaminant impact to the groundwater. The feasibility of <br /> vapor extraction to reduce the mass of contamination in the soil and groundwater has not been evaluated. <br /> Submit a work plan to investigate the lateral and vertical extent of the contamination at this site and to <br /> evaluate the feasibility of vapor extraction as a remedial alternative for cleanup of the site by March 1, <br /> 2005. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> Margaret agorio, Su�visingEHS <br /> LOP/Unit IV <br /> c: ATC -Jeanne Homsey <br /> (.VRWOCR_Jim Barton <br />