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CAMBRIA <br /> suggested the USTs are likely the primary source area for petroleum hydrocarbons and MTBE <br /> detected in groundwater beneath this site The findings of this investigation are documented in <br /> Cambria's February 10, 2000 Site Investigation/Fourth Quarter 1999 Groundwater Monitoring <br /> Report <br /> 2000 Hoist and Waste Oil UST Removal During November 2000, one 550-gallon waste oil <br /> UST and two hydraulic hoists were removed Cambria collected one soil sample from beneath <br /> the waste oil tank and one sample beneath each hoist No petroleum hydrocarbons, fuel <br /> oxygenates, halogenated volatile organic compounds, or polychlorinated biphenyls were detected <br /> in soil samples collected from beneath the former waste oil UST Total chromium, nickel, and <br /> zinc were detected in soil beneath the waste oil tank at concentrations well below hazardous <br /> levels Samples collected beneath the hoists were analyzed for total recoverable petroleum <br /> hydrocarbons (TRPH) The sample collected from the northwestern hoist contained 820 ppm <br /> TRPH Soil from beneath the other hoist did not contain detectable concentrations of TRPH <br /> Complete results of waste oil UST and hoist removals are documented in Cambria's <br /> December 15, 2000 Waste Oil Tank/Hoist Removal Report <br /> 1� Well Survey• A well survey was submitted to San Joaquin County Public Health Services, <br /> Environmental Health Division during our June 19, 2001 meeting One water supply well was <br /> identified within half a mile from the sub,�ect site It is a domestic well located approximately <br /> one-half mile southwest of the site(Figure 1) <br /> 2001 Soil Borings: During October 2001, Cambria advanced six cone penetration test (CPT) <br /> borings (CPT-1 through CPT-6) Borings CPT-1 and CPT-2, drilled south of the USTs, delineate <br /> the vertical extent of petroleum hydrocarbons and fuel oxygenates in soil Groundwater samples <br /> were collected from boring CPT-1, near the USTs, and from borings CPT-2 through CPT-6, to <br /> assess the lateral impact to groundwater MTBE was detected in groundwater from all the <br /> borings at concentrations ranging from 2 8 to 390,000 parts per billion (ppb), with the highest <br /> concentration in CPT-5 TPHg, tertiary butanol (TBA), tertiary amyl methyl ether (TAME), and <br /> ethyl tertiary butyl ether (ETBE) were also detected in groundwater from some of the bonngs <br /> Complete investigation results are documented in Cambria's April 18, 2002 Site Investigation <br /> Report and Site Conceptual Model <br /> 2002 Well Installation During September 2002, Cambria drilled and installed one groundwater <br /> extraction well (MW-4), three groundwater monitoring wells (MW-5 through MW-7), and two <br /> piezometers (P-1 and P-2) at this site No TPHg, benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), or fuel oxygenates were detected in soil from well borings MW-5 through MW-7 <br /> 0955 3 <br />