ARCHIVED REPORTS_XR0011043 - Laserfiche WebLink

Home Browse Search

Table 3 Chevron Stockton Laboratory Analysis of Soils - Apnl and May 1991 Results presented in mg/kg (ppm) SAMPLE ID BENZENE TOLUENE ETHYL- XYLENES TPHG TPHD DATE BENZENE (1) (2) 4/29-5/1/91 MW1-65 S' NO 0023 NO NO NO NO MW2-655' ND 0015 NO ND NO NO MW3-65 5 NO 0 016 NO ND NO NO Detection Ltauts 0 00s 000$0 00050 00050 10 10 Notes BTEx -Andysts by EPA method 801518020 TPHG -Total Petroleum Hydrocarbons as Oasolux TPHD -Total Petroleum Hydrocarbons as Diesel (1) -Analysis by Modified EPA method 8015 (2) -Analysis by Modsfi,d EPA method 8015 ND -Compounds Not Ntechd above Method Duteeuou Limits 7 0 LABORATORY ANALYSIS - GROUNDWATER To accurately determine groundwater quality beneath the site, groundwater samples were collected from each monitoring well on May 7, June 21, and August 22, 1991 During each sampling round, groundwater samples were collected after purging approximately 3 to 5 well volumes of water from each well After adequate purging, groundwater samples were collected from each monitoring well using a new disposable Teflon bailer Stabilization of EC, pH, and temperature was checked prior to sample collection to ensure samples collected were representative of formation water All samples were sent to state-certified Sequoia Analytical laboratories and analyzed for STEX using EPA methods 8015, and TPHG and TPHD using modified EPA method 8015 Laboratory results from the May 7, 1991 sampling round detected low levels of benzene, � toluene, ethvlbenzene, xylenes, and TPHG In monitoring well MW1 Low levels of benzene, xylene,TPHG and TPHD were also detected in monitoring well MW2 No dissolved petroleum hydrocarbon constituents were detected in well MW3 No constituents were present above Maximum Contaminant Levels(MCI s) established by the State Department of Health Services Cho�vsA bw W csaM