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• <br /> 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 electronic <br /> indicator and a clear TeflonO bailer or an oil-water interface probe Wells not containing <br /> SPH are then purged of approximately three casing volumes of water(or to dryness) using a <br /> centrifugal pump, gas displacement pump, or bailer Equipment used for the current <br /> sampling event is noted on the attached field data sheets During purging, temperature, pH, <br /> and electrical conductivity are monitored in order to document that these parameters are <br /> stable prior to collecting samples After purging, water levels are allowed to partially <br /> recover Groundwater samples are collected using a Teflon bailer, placed into appropriate <br /> EPA-approved containers, labeled, logged onto chain-of-custody documents, and transported <br /> on ice to a Cahforma State-certified laboratory <br /> Laboratory Procedures <br /> Groundwater samples collected were analyzed for the presence of total petroleum <br /> hydrocarbons calculated as gasoline using modified EPA Method 8015 Groundwater <br /> samples collected were analyzed for the presence of benzene, toluene, ethylbenzene and <br /> xylenes, using modified EPA Method 8020 The five gasoline oxygenates (MtBE, DIPE, <br /> ETBE, TAME and TBA) were analyzed by EPA Method 8260 <br /> SN lssacDP1200ITRA J818800401A 1aa doc 08/24/01 <br /> A - 1 <br />