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construction Visual observations during tank removal indicated that the <br /> tank contained several holes At the time the tank was removed, the <br /> contents were reported to be unleaded gasoline fuel <br /> Analyses of soil and ground water samples collected from the tank <br /> excavation after removal activities indicated that gasoline and gasoline <br />' components were present in site soils <br /> Site Characterization <br /> Soil and ground water investigations were performed by Kleinfelder, Inc , <br />' in March 1990 and by ERM in March 1991 Kleinfelder conducted a soil <br /> gas survey, installed three shallow soil borings, and installed three <br />' monitoring wells (MW-1 through MW-3, Figure 1-2) ERM subsequently <br /> installed two additional monitoring wells at the site (MW-4 and MW-5, <br /> Figure 1-2) <br /> The extent of hydrocarbon release to soil was estimated based on the <br /> results of investigations at Former Tank Site #1, and was summarized in <br /> �] the PreIiminanj Assessment Report for Former Storage Tanks Located at 1325, <br /> 1541, & 1515 West Weber Avenue - Stockton, California (ERM, May 1993, <br /> hereinafter "PAR") The lateral and vertical extent of total petroleum <br />' hydrocarbons (TPH) and benzene, toluene, ethylene, and xylene (BTEX) in <br /> soil at Former Tank Site #1 was limited to a localized area in the vicinity of <br /> the former UST, in a zone between approximately 6 and 11 feet bgs <br />' Based on data obtained during the investigation, the volume of soils <br /> containing TPH as gasoline in excess of the 100 milligrams per kilogram <br /> (mg/kg) cleanup goal for TPH at Former Tank Site #1 was estimated to be <br /> approximately 200 to 300 cubic yards The extent of TPH and BTEX in <br /> ground water also appeared to be limited to a localized area in the <br /> vicinity of the former tank <br /> Excavation <br /> Soil excavation activities were conducted in October 1993 by ERM and <br /> Sunriver Engineering & Construction, Inc , of Brentwood, California A <br /> state-certified mobile laboratory, Transglobal Environmental <br /> Geocherrustry (TEG) of Sacramento, California, was used to perform on- <br /> site analysis of soil samples for the chemical analysis Excavation and <br /> confirmation sampling activities were summarized in a letter report <br />' submitted to PHS/EHD on 2 March 1994 <br /> 3-2 <br />