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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 checking <br /> for the presence of separate-phase hydrocarbons (SPH), using either an electronic indicator and a <br /> clear Teflon bailer or an oil-water interface probe Wells not containing SPH are then purged <br /> of approximately three casing volumes of water(or to dryness) using a centrifugal pump, gas <br /> displacement pump, or bailer Equipment used for the current sampling event is noted on the <br /> attached field data sheets During purging, temperature, pH, and electrical conductivity are <br /> monitored in order to document that these parameters are stable prior to collecting samples <br /> After purging, water levels are allowed to partially recover Groundwater samples are collected <br /> using a Teflon® bailer, placed into appropriate EPA-approved containers, labeled, logged onto <br /> chain-of-custody 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 hydrocarbons <br /> calculated as gasoline using modified EPA Method 8015 Groundwater samples collected were <br /> analyzed for the presence of benzene, toluene, ethylbenzene and xylenes, using modified EPA <br /> Method 8020 The five gasoline oxygenates (MtBE, DIPE, ETBE, TAME and TBA) were <br /> analyzed by EPA Method 8260 <br /> IT CORPORATION <br /> SAC\N 1saeDP120021PRJ1PJ8188018800401A 2aa doc-Olio <br /> 01070000} <br /> A-1 <br />