ARCHIVED REPORTS XR0000794 - Laserfiche WebLink

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Groundwater Monitoring Well Development and Sampling The groundwater monitoring wells were developed after completion The development procedure for each well consisted of pumping or bailing water from the well until the water was visibly clear or until a maximum of ten casing volumes were removed Groundwater samples were collected using a Teflon bailer Samples were placed into appropriate EPA- approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California State-certified laboratory Organic Vapor Procedures Soil samples collected at 5-foot depth intervals during drilling were analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) with a 10 2 eV lamp The test procedure involved measuring approximately 30 grams from an undisturbed soil sample, placing this subsample in a ZiplockT""-type bag or in a clean glass jar, and sealing the far with aluminum foil secured under a nng-type threaded lid The container was warmed for approximately 20 minutes (in the sun), then the head-space within the container was tested for total organic vapor, measured in parts per million as benzene (ppm, volume/volume) The instrument was calibrated prior to being taken to the field The results of the field-testing were noted on the boring logs PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confi- dence of laboratory analyses Laboratory Procedures Selected soil samples collected from the soil bonngs and groundwater samples collected from the wells were analyzed for the presence of total petroleum hydrocarbons calculated as gasoline (TPH-g),benzene, toluene, ethylbenzene, and xylenes (BTEX), and methyl tertiary-butyl ether(MtBE) using EPA Methods 8015 and 8020,with MtBE, tert-butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl- tertiary-butyl ether(ETBE), and tert-amyl methyl ether(TAME)by EPA Method 8260 Groundwater samples were analyzed for the presence of TPH-g, BTEX, and MtBE Additionally, the groundwater samples were analyzed for the oxygenates MtBE, Ethanol,Methanol, TBA,DIPE, ETBE, and TAME by EPA Method 8260 Soil Cuttings and Purge Water Soil cuttings generated during drilling operations were temporarily stored on site and covered with plastic sheeting pending characterization and disposal The characterization of the soil reported non-detectable concentrations of petroleum hydrocarbons, therefore the soil cuttings 911005 1BISOLGW A-2 March 17,1999