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Report Remedial Investigation and Well Installation Report <br /> Date October 6,2004 <br /> ATTACHMENT D (Continued) <br /> FIELD AND LABORATORY PROCEDURES <br /> Groundwater Sampling Procedures <br /> Sampling equipment was thoroughly cleaned prior to the collection of each sample The sampling procedure for each <br /> well included measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH) using <br /> either an electronic indicator and a clear TeflonO bailer or an oil-water interface probe Prior to sampling, wells <br /> were purged of approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal <br /> pump, gas displacement pump, or bailer During purging, temperature, pH, electrical, and conductivity were <br /> monitored to document that these parameters were stable prior to collecting samples After purging, water levels <br /> were allowed to partially recover Groundwater samples were collected using a clean disposable Teflon@ bailer, <br /> placed into appropriate U S 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 were decontaminated with a steam cleaner Sensitive equipment, such <br /> as the water-level sounder, were sprayed with a non-phosphate soap and deionized water solution and rinsed with <br /> deionized water All water used for equipment decontamination was collected and contained in a truck-mounted <br /> water tank <br /> Groundwater Sample Laboratory Procedures <br /> Groundwater samples were analyzed for the presence of GRO, benzene, toluene, ethylbenzene, xylenes (total), fuel <br /> oxygenates, and lead scavengers using U S EPA Method 8260 The methods of analysis for the groundwater <br /> samples were documented in the certified laboratory analytical report <br /> Purge and Rinsate Water Disposal <br /> Water generated during well sampling and equipment cleaning was pumped into a truck-mounted water tank The <br /> water was transported to Blaine Tech's holding facility in Sacramento, California, for temporary storage The water <br /> was then transported by Dillard Environmental Services to Altamont Landfill and Resource Recovery Facility in <br /> Altamont,California,for disposal <br /> K 1Wprocessl15 BP ARCO\021$612004 Assessment\Report 04 doe Page D-2 <br />