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s <br /> 0 C A M B R I A <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 /> Well Survey: A well survey was submitted to San Joaquin County Public Health Services, <br /> Environmental Health Division during our rune 19, 2001 meeting Only one water supply well <br /> was identified within half a mile from the subject site It is a domestic well located <br /> approximately one-half mile southwest of the site (Figure 1) <br /> 2001 Soil Bonngs: During October 2001, Cambria advanced six cone penetration test (CPT) <br /> borings Borings CPT-1 and CPT-2, drilled south of the USTs, delineate the vertical extent of <br /> • petroleum hydrocarbons and fuel oxygenates in soil Groundwater samples were collected from <br /> boring CPT-1, near the USTs, and from borings CPT-2 through CPT-6, to assess the lateral <br /> impact to groundwater MTBE was detected in groundwater from all the borings at <br /> concentrations ranging from 2 8 to 390,000 parts per billion (ppb), with the highest concentration <br /> in 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 Complete <br /> investigation results are documented in Cambria's April 18, 2002 Site Investigation Report and <br /> Site Conceptual Model <br /> 2002 Well Installation. During September 2002, Cambria installed one groundwater <br /> monitoringlextraction well (MW-4), three groundwater monitoring wells (MW-5 through <br /> MW-7), and two piezometers (P-1 and P-2) No TPHg, benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), or fuel oxygenates were detected in soil from borings MW-5 through MW-7 These <br /> results delineate fuel oxygenates laterally in soil north of the USTs and to the east and southeast <br /> of the site This investigation is documented in Cambria's December 15, 2002 Response <br /> Letter/Site Investigation and Thtrd Quarter 2002 Groundwater Monitoring Report/Work Plan <br /> Groundwater Monitoring Program: There are seven monitoring wells (MW-1 through MW-7) <br /> and two piezometers (P-1 and P-2) located onsite During the third quarter 2002 sampling event, <br /> MTBE was detected in groundwater samples collected from wells MW-1 through MW-4, MW-7, <br /> 0955 3 <br />