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ATTACHMENT A <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> The sampling procedure for each well consists first of measuring the water level and <br /> checking for the presence of separate-phase hydrocarbons (SPH), using either an <br /> electronic indicator and a clear TeflonO bailer or an oil-water interface probe Wells not <br /> containing SPH are then purged of approximately three casing volumes of water (or to <br /> dryness) using a centrifugal pump, gas displacement pump, or bailer Equipment used <br /> for the current sampling event is noted on the attached field data sheets During purging, <br /> temperature, pH, and electrical conductivity are monitored in order to document that <br /> these parameters are stable prior to collecting samples After purging, water levels are <br /> allowed to partially recover Groundwater samples are collected using a Teflon`s bailer, <br /> placed into appropriate EPA-approved containers, labeled, logged onto chain-of-custody <br /> documents, and transported on ice to a California state-certified laboratory <br /> Laboratory Procedures <br /> Groundwater samples collected were analyzed for the presence of total petroleum <br /> hydrocarbons calculated as gasoline, benzene, toluene, ethylbenzene and xylenes using <br /> EPA Method 8015GRO/8021 The five gasoline oxygenates (MTBE, DIPE, ETBE, <br /> TAME and TBA), EDB, and 1,2-DCA were analyzed by EPA Method 8260B <br /> 1 <br /> Shaw Environmental,Inc <br /> N 1sacDP120041Prj188418800401A 4ab doc <br />