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EVAX Project B239-02 April 7, 1992 <br /> 1• <br /> CONCLUSIONS <br /> Main conclusions are as follows: <br /> 1. Soils impacted by gasoline hydrocarbon products occur <br /> near and north of the former USTs, mainly in the <br /> 7 to 16 feet depth interval . Hydrocarbon contents of <br /> soil samples ranged up to: 616 ppm TPHg, 18.0 ppm <br /> benzene, 4.0 ppm toluene, 7.7 ppm ethylbenzene, and <br />` 27.0 ppm total xylenes. <br /> 2. Shallow groundwater level is currently at a depth <br /> of approximately 8 feet below ground surface. <br /> Groundwater flow direction is inferred to be to the <br /> northwest based on groundwater monitoring well data. <br /> 1 3. Laboratory analyses results of water samples taken in <br /> March 1992 from MW-1, MW-2, and MW-3 indicate <br /> groundwater at the site is impacted by gasoline <br /> hydrocarbon products. Maximum hydrocarbon contents <br /> were found in water sampled from MW-2, at the north end <br /> of the site: 14.1 ppm TPHg, 0.239 ppm benzene, <br /> ti 0.053 ppm toluene, 0.514 ppm ethylbenzene, <br /> 5.14 ppm total xylenes, and 0.16 ppm total lead. <br /> RECOMMENDATIONS <br /> 1. EVAX recommends groundwater at the site be monitored <br /> for at least a year and site remediation options be <br /> considered to address the hydrocarbon impact of the <br /> site. <br /> 2. A copy of this report should be submitted to: <br /> Mr. Ron Valinoti <br /> Environmental Health Division <br /> San Joaquin Public Health Services <br /> P. 0. Box 2009 <br /> Stockton, California 95201 <br /> Mr. Gordon Boggs <br /> Central Valley Region Water Quality Control Board <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> -8- <br />