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I UNDERGROUND STORAGE TANK CLOSUAILM . <br /> 1605 South EI Dorado Street Stockton California <br /> 1 The soil samples were submitted under chain-of-custody, to a state-certified <br /> analytical laboratory to be analyzed for a) totalY <br /> etroleum hydrocarbons <br /> P <br />' (TPH), as gasoline, and b) benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) In addition, the tank excavation and product line trench <br /> soil samples were analyzed for total lead and 1,2-dibromoethane (EDB) <br /> • Excavated soils were temporarily stockpiled on site, under and on plastic <br /> sheeting, pending receipt of the analytical results <br /> 2 0 BACKGROUND INFORMATION <br /> 2 1 Site Descry tion <br />' The subject site is located between South EI Dorado and Center Streets in the City of <br /> Stockton, San Joaquin County, California (Figure 1) The site is situated in a <br /> commercial/residential/light industrial area of southern Stockton <br /> The Exxon site is an inactive, <br /> partially abandoned service station that previously retailed <br /> leaded and unleaded gasolines Three 10,000-gallon single-wall steel USTs were formerly <br /> located immediately south of the dispenser islands on the southern half of the site <br /> (Figure 2) <br /> 2 2 Previous Investigation <br />' On February 5, 1991, a ground penetrating radar (GPR) survey was performed by <br /> NORCAL Geophysical Consultants, Inc , of Petaluma, California The survey was <br /> performed in the area of the former UST basin to locate existing underground facilities <br /> prior to drilling soil borings Upon completion of the GPR survey, two soil borings were <br /> drilled on February 22, 1991, at an an ile of 30 degrees from ve ica, a jai nt to the <br /> former UST basin (Figure 2) The actual vertical depth penetrated by the borings was <br /> approximately 53 feet below surface Soil samples collected from the two borings were <br /> analyzed for TPH, as gasoline, BTEX, EDB, 1,2-dichloroethane, and total lead Soil boring <br /> and sampling results were reported by Aegis to Exxon, in a "Pre-Tank Replacement Site <br /> IAssessment Results Report," dated March 5, 1991 <br /> On July 2 and 3, 1991, Aegis conducted soil boring, sampling, and installation of / <br /> I monitoring wells MW-1, MW-2, and MW-3 (Figure 2) Results of the investigation were f <br /> reported by Aegis to Exxon in a "Phase I Subsurface Investigation Results Report," dated <br /> September 13, 1991 <br /> Ile <br /> I <br /> 51-044A TCR 2 <br /> 1 <br />