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r <br /> i <br /> 1 <br />' ATTACHMENT A <br /> FIELD AND LABORATORY PROCEDURES <br /> rSampling 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, benzene, toluene, ethylbenzene and xylenes using EPA <br /> Method 8015GRO/8021 The five gasoline oxygenates (MtBE, DIPE, ETBE, TAME and TBA) <br /> were analyzed by EPA Method 8260B <br /> 1 <br />' - <br /> N lsacbP120031Pg188018800401A3id doc --Shaw Environmental,Inc <br />' A-1 <br />