ARCHIVED REPORTS XR0009008 - Laserfiche WebLink

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CAMBRIA oxygenates, halogenated volatile organic compounds,or polychlorinated biphenyls were detected in soil samples collected from beneath the former waste oil UST Total chromium, nickel, and zinc were detected in soil beneath the waste oil tank at concentrations well below hazardous levels Samples collected beneath the hoists were analyzed for total recoverable petroleum hydrocarbons (TRPH) The sample collected from the northwestern hoist contained 820 ppm TRPH Soil from beneath the other hoist did not contain detectable concentrations of TRPH Complete results of waste oil UST and hoist removals are documented in Cambria's December 15, 2000 Waste Oil Tank/Hoist Removal Report Well Survey• A well survey was submitted to San Joaquin County Public Health Services, Environmental Health Division during our June 19, 2001 meeting Only one water supply well was identified within half a mile from the subject site It is a domestic well located approximately one-half mile southwest(cross-gradient) of the site(Figure 1) 2001 Soil Borings: During October 2001, Cambria advanced six cone penetration test (CPT) borings (CPT-1 through CPT-6) Borings CPT-1 and CPT-2, drilled south of the USTs,delineate the vertical extent of petroleum hydrocarbons and fuel oxygenates in soil Groundwater samples • were collected from boring CPT-1, near the USTs, and from borings CPT-2 through CPT-6, to assess the lateral impact to groundwater MTBE was detected in groundwater from all the borings at concentrations ranging from 2 8 to 390,000 ppb, with the highest concentration in CPT-5 TPHg, tertiary butanol (TBA), tertiary amyl methyl ether (TAME), and ethyl tertiary butyl ether (ETBE) were also detected in groundwater from some of the borings Complete investigation results are documented in Cambria's April 18, 2002 Site Investigation Report and Site Conceptual Model 2002 Well Installation During September 2002, Cambria installed one groundwater monitoring/extraction well (MW-4), three groundwater monitoring wells (MW-5 through MW-7), and two piezometers (P-1 and P-2) No TPHg, benzene, toluene, ethylbenzene, xylenes (BTEX), or fuel oxygenates were detected in soil from borings MW-5 through MW-7 These results delineate fuel oxygenates laterally in soil north of the USTs and to the east and southeast of the site This investigation is documented in Cambria's December 15, 2002 Response Letter/Site Investigation and Third Quarter 2002 Groundwater Monitoring Report/Work Plan 2002 Aquifer Pump Test: During October 2002, Cambria conducted a five-day groundwater extraction (GWE) test Data collected during the test suggest that interim remediation was effective Approximately 4,249 gallons of groundwater were extracted over the five-day period • 0955 3