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Mr Jeffrey Wong <br /> C A M B R I A February 23, 2006 <br /> • 2000 Hoist and Waste Oil UST Removal During November 2000, one 550-gallon waste oil UST <br /> and two hydraulic hoists were removed Cambria collected one soil sample from beneath the <br /> waste oil tank and one sample beneath each hoist No petroleum hydrocarbons, fuel oxygenates, <br /> halogenated volatile organic compounds, or polychlorinated biphenyls were detected in soil <br /> samples collected from beneath the former waste oil UST Total chromium, nickel, and zinc were <br /> detected in soil beneath the waste oil tank at concentrations well below hazardous levels <br /> Samples collected beneath the hoists were analyzed for total recoverable petroleum hydrocarbons <br /> (TRPH) The sample collected from the northwestern hoist contained 820 ppm TRPH Soil from <br /> beneath the other hoist did not contain detectable TRPH concentrations Cambria's <br /> December 15, 2000 Waste Oil Tank/Hoist Removal Report presents complete results of waste oil <br /> UST and hoist removals <br /> Well Survey Cambria submitted a well survey to San Joaquin County Public Health Services, <br /> Environmental Health Division during a June 19, 2001 meeting One water supply well was <br /> identified within 1/s mile from the subject site This domestic well is located approximately <br /> i/i mile southwest of the site (Figure 1) <br /> 2001 Soil Borings During October 2001, Shell advanced six cone penetration test(CPT) borings <br /> (CPT-1 through CPT-6) Borings CPT-1 and CPT-2, drilled south of the USTs, delineate the <br /> • vertical extent of petroleum hydrocarbons and fuel oxygenates in soil To assess the lateral <br /> impact to groundwater, groundwater samples were collected from boring CPT-1, near the USTs, <br /> and from borings CPT-2 through CPT-6 MTBE was detected in groundwater from all the <br /> borings at concentrations ranging from 2 8 to 390,000 parts ppb, with the highest concentration in <br /> CPT-5 TPHg, tertiary butanol (TBA), tertiary amyl methyl ether (TAME), and ethyl tertiary <br /> butyl ether (ETBE) were also detected in groundwater from some of the borings Cambria's <br /> April 18, 2002 Site Investigation Report and Site Conceptual Model documents this investigation <br /> 2002 Diesel UST Installation During March and April 2002, Cambria observed tank pit <br /> excavation and trenching activities conducted by the current station owner's contractor while <br /> installing a diesel UST and product piping Cambria collected two soil samples from the tank <br /> excavation No total petroleum hydrocarbons as diesel, TPHg, benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX), or fuel oxygenates were detected in the samples Cambria's July 15, 2004 <br /> Underground Storage Tank Installation Report details these activities <br /> 2002 Well and Piezometer Installation During September 2002, Shell drilled and installed one <br /> groundwater monitoring and extraction well (MW-4), three groundwater monitoring wells <br /> (MW-5, MW-6, and MW-7), and two piezometers (P-1 and P-2) at this site No TPHg, BTEX, or <br /> fuel oxygenates were detected in soil from borings MW-5, MW-6, or MW-7 These results <br /> • delineate fuel oxygenates in soil north of the USTs and to the east and southeast of the site <br /> 3 <br />