ARCHIVED REPORTS_XR0005758 CASE 2

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I Sampling of Stockpiled Soil ' Soil samples were collected by advancing 2-inch diameter brass sample liners into the soil stockpile, after removing approximately 6 inches to 1 foot of surface material in the sample ' location One composite sample was collected per approximately 100 cubic yards of soil Soil samples for chemical analysis were retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps The samples were then sealed in zip-lock bags, placed on ' ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation ' Laboratory Analysis for Soil Samples Analyses for TPHg and benzene, toluene, ethylbenzene, xylenes (BTEX compounds) were ' performed by EPA Method 8015/8020 Fuel Oxygenates were analyzed by EPA Method 8260 Analysis for lead was done using EPA method 6010A ' Groundwater Sampling Procedures ' Sampling equipment was thoroughly cleaned prior to each sample Sampling consisted of measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an electronic indicator and a clear Teflon® bailer or an oil-water interface '. probe The initial samples from the wells were collected after they were purged during development Equipment and purging method used for the current sampling event are noted on the attached field data sheets During purging, temperature, pH, and electrical ' conductivity were monitored in order to document that these parameters were stable prior to collecting samples After purging, water levels were allowed to partially recover Groundwater samples were collected using a Teflon bailer, placed into appropriate EPA- approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California State-certified laboratory ' Laboratory Procedures for Groundwater Samples ' The groundwater samples were analyzed for the presence of total petroleum hydrocarbons calculated as gasoline, benzene, toluene, ethylbenzene, xylenes, and MtBE by EPA Method 8015/8020 Fuel oxygenates were analyzed by EPA Method 8260 These analyses were ' performed by utilizing a purge and trap extraction technique, with final detection by gas chromatography using flame- and photo-ionization detectors The methods of analysis for the groundwater samples are documented in the certified laboratory analytical report The ' certified analytical reports, chain-of-custody documentation, and field data sheets are presented as Attachments D and E