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I/A <br /> Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> EXECUTIVE SUMMARY <br /> Proposed Remedial Action <br /> 1702 Jackson Street, Escalon, CA <br /> Site Code: 1955 <br /> May 5, 1993 <br /> SITE BACKGROUND <br /> On April 17, 1991 six underground fuel storage tanks were removed from the site. The tanks <br /> size and contents were: one 550-gallon diesel; one 350-gallon waste oil; and four gasoline tanks <br /> (two 2,000-gallon, one 4,000-gallon, and one 10,000-gallon capacity). Analysis of soil samples <br /> collected during tank removal indicated gasoline had impacted the soil and perhaps also the <br /> groundwater. Diesel impact to the soil is confined to approximately the first 13-feet below <br /> surface grade. Subsequent investigations included the installation of six soil borings and one <br /> monitoring well for collection of soil and groundwater samples. Analysis of groundwater <br /> samples collected from the monitoring well indicate that gasoline has impacted groundwater. <br /> PROPOSED REMEDIAL ACTION <br /> To further assess the groundwater impact at the site three additional monitoring wells will be <br /> installed in the vicinity of the former gasoline tanks. Due to the location of the property <br /> excavation of the gasoline impacted soils is the least feasible remedial option, therefore, three <br /> vapor wells will be installed to evaluate the potential of vapor extraction as a remediation option. <br /> In the area of the former diesel and waste oil tanks the recommended remediation option is <br /> excavation due to the ineffectiveness of vapor extraction for diesel/waste oil impacted soils. The <br /> noise, visual, traffic and odor impact to the community is expected to last approximately one <br /> week. Depending upon the contaminant levels, the soil will be bioremediated on site under <br /> permit from the Regional Air Board, or disposed of by State-licensed landfill or disposal facility. <br /> The excavation will be backfilled with clean fill or remediated soil in accordance with City and <br /> County regulations. Perimeter fencing will remain in place until all physical dangers are <br /> mitigated. <br /> EXECSUMM.593 <br />