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PUBLIC H?ALTH SERVI(S ,aPpU1N��o <br /> SAN JOAQUIN COUNTY <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 is. <br /> GENE GABBARD JUN 2 1 1999 <br /> P O BOX 1260 <br /> STOCKTON CA 95212 <br /> RE: Gene Gabbard, Inc. SITE CODE: 1090 <br /> 640 N. EI Dorado St. <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Subsurface Investigation Summary Report", dated May 20, 1999, that <br /> was prepared by Ground Zero Analysis, Inc. (Ground Zero) for the above referenced site <br /> and has the following comments for your consideration and action. <br /> On January 19, 1999 field activities were initiated to implement the "Workplan for <br /> Subsurface Investigation", submitted to PHS/EHD on August 24, 1998 by Ground Zero <br /> on behalf of Gene Gabbard, Inc., and approved with conditions on September 1, 1998. <br /> The purpose of the work plan was to initiate the investigation of the vertical and lateral <br /> extent, in soil and groundwater, of petroleum hydrocarbon contamination evidenced at <br /> this site following the removal of one 250-gallon waste oil tank. <br /> Only three of the four soil borings proposed in the work plan were completed. Boring <br /> SB-3 was advanced in the area of the former tank pit, boring SB-1 was advanced <br /> approximately 15-feet northwest of the former tank pit and boring SB-2 was advanced <br /> approximately 20-feet southwest of the former tank pit. Analysis of selected soil <br /> samples collected from these borings indicate significant petroleum hydrocarbon and <br /> volatile organic compound (VOC) contamination has occurred in the former tank pit, to at <br /> least 31 feet below surface grade (bsg). Contaminant impact to soil was also evidenced <br /> in SB-1, to a depth of at least 21 feet bsg. No soil contamination was evidenced in SB-2. <br /> Two grab groundwater samples were collected, one from SB-1 and one from SB-3. Both <br /> evidenced significant petroleum hydrocarbon and VOC contamination upon analysis, <br /> including evidence of floating free product in SB-3. Please note that according to the <br /> laboratory analytical results submitted with the report, the water sample collected from <br /> SB-1 was held in excess of the 14-day holding time limit for all tests run with the <br /> exception of EPA methods 5030, modified 8015, and 8020 or 602. A grab groundwater <br /> sample was not collected from SB-2, therefore no laboratory analytical data exists which <br /> could be used to support an estimate of the lateral extent of groundwater contamination <br /> to the southwest of the former tank pit. <br /> The vertical extent of soil contamination may have been made with this mobilization. <br /> Lateral definition of soil contamination has been made only to the southwest. Definition <br /> of the groundwater plume remains to be made both vertically and laterally. <br /> A Division of San Joaquin County Health Care Services <br />