ARCHIVED REPORTS XR0009020 - Laserfiche WebLink

Home Browse Search

CAM B R I A S detected in groundwater beneath this site The findings of this investigation are documented in Cambria's February 10, 2000 Site Investigation/Fourth Quarter 1999 Groundwater Monitoring Report 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 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 One water supply well was identified within half a mule from the subject site it is a domestic well located approximately one-half mile southwest 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 to 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 to 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 drilled and installed one groundwater extraction well (MW-4), three groundwater monitoring wells (MW-5 through MW-7), and two piezometers (P-1 and P-2) at this site 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 in soil north of the USTs and to the east and southeast of the 0955 3