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Date August 2,2004 <br /> ATTACHMENT G <br /> FIELD AND LABORATORY PROCEDURES <br /> Soil Sampling Procedures <br /> Soil samples for laboratory analysis were not collected during this investigation Samples were collected <br /> for lithologic characterization New, pre-cleaned brass sleeves were used for each sample collected for <br /> lithologic interpretation <br /> Sampling equipment used to collect of samples for lithologic characterization was thoroughly cleaned by <br /> washing in a non-phosphate detergent solution and rinsing in clean water prior to collection of each <br /> sample <br /> Groundwater Sampling Procedures <br /> Sampling equipment for groundwater sampling is thoroughly cleaned prior to the collection of each <br /> sample The sampling procedure for each well includes measuring the water level and checking for the <br /> presence of separate-phase hydrocarbons (SPH) using either an electronic indicator and a clear Teflon® <br /> bailer or an oil-water interface probe Wells not containing SPH are purged of approximately three casing <br /> volumes of water (or to dryness) using a submersible pump, centrifugal pump, gas displacement pump, or <br /> bailer The equipment and purging methods used for the current sampling event are noted on the attached <br /> field data sheets During purging, temperature, pH, and electrical conductivity are monitored to document <br /> that these parameters are stable prior to collecting samples After purging, water levels are allowed to <br /> partially recover Groundwater samples are collected using a clean, disposable Teflon® bailer, placed <br /> . into appropriate EPA-approved containers, labeled, logged onto chain-of-custody documents, and <br /> transported on ice to a California state-certified laboratory <br /> Groundwater Sampling Decontamination Procedures <br /> Prior to sampling each well, reels and pumps are decontaminated with a steam cleaner Sensitive <br /> equipment, such as the water-level sounder, are sprayed with a non-phosphate soap and deionized water <br /> solution and rinsed with deionized water All water used for equipment decontamination is collected and <br /> contained in a truck-mounted water tank <br /> Laboratory Procedures <br /> The groundwater samples are analyzed for the presence of gasoline range organics (GRO), benzene, <br /> toluene, ethylbenzene, xylenes (total), and a wide range of volatile organic compounds using EPA <br /> Method 8260B The methods of analysis for the groundwater samples are documented in the certified <br /> laboratory analytical report <br /> Purge and Rinsate Water Disposal <br /> Water generated during well sampling and equipment cleaning is pumped into a truck-mounted water <br /> tank The water is transported to Blaine Tech's holding facility in Sacramento, California, for temporary <br /> storage The water is then transported by Dillard Environmental Services to the Altamont Resource <br /> Recovery Facility in Altamont, California, for disposal <br /> K 1Wprocess\l5 SP ARCO\p4493\May Well 0414493 well installation report04b doe Page G - 1 <br />