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1 <br /> QUARTERLY REPORT <br /> Stewart' s Beacon <br />' 515 West lith Street <br /> Tracy, California <br /> 1. 0 INTRODUCTION <br />' In accordance with a request from the former property owner, Mr. <br /> William Stewart, Geological Audit Services, Inc. (GeoAudit) has <br /> I prepared this report of site assessment activities performed at 515 <br /> West 11th Street in Tracy, California (the site) during the third <br /> quarter of 1993 . During this quarter, 700 cubic yards of <br /> contaminated soil were excavated from a former underground storage <br /> tank area, and _th� groundwater monitoring welly were installed <br /> and sa r pled. ` Vizo <br /> 2 . 0 BACKGROUND <br /> 2 . 1 Site Location <br /> The site is located in a relatively flat business/residential area <br /> of Tracy, California (Figure 1) . The site was formerly a Beacon <br /> gasoline station. Presently it is vacant, but plans are underway to <br /> construct a new gasoline service station in the future. <br /> 2 .2 Tank Removal <br /> It is our understanding that three underground storage tanks <br /> (UST ' s) were removed from the site in 1988. Hydrocarbon <br /> contamination was detected in the soil and groundwater samples <br /> collected following the tank removal, indicating that an <br /> unauthorized release of hydrocarbons had occurred. The soil was <br /> allowed to aerate for more than a year, and the tank cavity <br /> remained open. Assessment of the extent of contamination was <br /> subsequently ordered by the San Joaquin County PHS/EHD. <br /> 2 . 3 Soil and Groundwater Assessment <br /> Three groundwater monitoring wells were installed by Geological <br /> Technics of Modesto, California in June 1988 (Figure 2) . Soil and <br /> groundwater samples were collected at that time and, and laboratory <br /> analyses revealed that soil and groundwater to the north of the <br /> tank cavity were contaminated with gasoline compounds. Geological <br /> Technics recommended further assessment of the lateral extent of <br /> groundwater contamination, but it appears that no additional <br /> investigations were performed until early 1990. <br /> 1 <br />