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1 <br /> a <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 checking <br /> Ifor 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 disposable 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 TP <br /> Hg p Hg and BTEX using EPA <br /> 1 Methods 8015GRO/8021B The five gasoline oxygenates (MTBE, DIPS, ETBE, TAME and <br /> TBA), EDB, and 1,2-DCA were analyzed by EPA Method 8260B <br /> 1 <br /> 1 <br /> N lsacbP\20091pr3188018800401A 5aa doc SHAW ENVIRONMENTAL,INC <br /> A-1 <br />