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Report:Work Plan for Groundwater Monitoring <br /> Date: February 13,2004 <br /> ATTACHMENT B (Continued) <br /> SAMPLING AND ANALYSIS PROCEDURES <br /> Groundwater Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior to each sample. The sampling procedure for each well includes <br /> measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an <br /> electronic indicator and a clear Teflon® bailer or an oil-water interface probe.Prior to sampling wells will be purged <br /> of approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal pump, gas <br /> displacement pump,or bailer. The equipment and purging methods used for the current sampling event are noted on <br /> attached field data sheets. During purging, temperature, pH, electrical conductivity , and dissolved oxygen are <br /> monitored in order to document that these parameters are stable prior to collecting samples. After purging, water <br /> levels are allowed to partially recover. Groundwater samples are collected using a clean disposable Teflon®bailer, <br /> placed into appropriate EPA-approved containers, labeled,logged onto chain-of-custody documents,and transported <br /> on ice to a California state-certified laboratory. <br /> Groundwater Sampling Decontamination Procedures <br /> Prior to sampling each well, reels and pumps will be decontaminated with a steam cleaner. Sensitive equipment such <br /> as the water level sounder are sprayed with a non-phosphate soap and deionized water solution and rinsed with <br /> deionized water. All water used for equipment decontamination is collected and contained in a truck-mounted water. <br /> Groundwater Sample Laboratory Procedures <br /> Groundwater samples are analyzed for the presence of TPHg, benzene, toluene, ethylbenzene, xylenes (total), fuel <br /> oxygenates, and lead scavengers using EPA Method 8260. The methods of analysis for the groundwater samples are <br /> documented in the certified 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 tank. The <br /> water is transported to Blaine Tech's holding facility in Sacramento,California,for temporary storage. The water is <br /> then transported by Dillard Environmental Services to Altamont Landfill and Resource Recovery Facility in <br /> Altamont,California for disposal. <br /> KAWprocessU5 BP ARCO\0218612186 Workplan 04.doc Page B-2 <br />