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CAMBRIA 2000 Hoist and Waste Oil UST Removal: During November 2000, one 550-gallon waste oil UST and two hydraulic hoists were removed Cambria collected one soil sample from beneath the waste oil tank and one sample beneath each hoist No petroleum hydrocarbons, fuel oxygenates, halogenated volatile organic compounds,or polychlorinated biphenyls were detected in soil samples collected from beneath the former waste oil UST Total chror mum, 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 SJCPHS/EHD 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 anile southwest of the site (Figure 1) 2001 Soil Boring Activities. During October 2001, Cambria advanced six cone penetration test • (CPT) borings 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 parts per billion (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 may be found in Cambna's April 18, 2002 Site Investigation Report and Site Conceptual Model Groundwater Monitoring Activities There are three monitoring wells located onsite (MW-1, MW-2, and MW-3), which are sampled quarterly During the first quarter 2002 sampling event, MTBE was detected in all three wells at concentrations ranging from 1,500 to 11,000 ppb During the same event, TBA and TAME were also detected in all wells at concentrations ranging from 94 to 430 ppb and 5 4 to 27 ppb, respectively TPHg, benzene, toluene, ethylbenzene, and xylenes (BTEX) were not detected, although some detection lirruts were elevated Based on these results, SJCPHS/EHD requested further groundwater plume assessment 0955 3