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ATTACHMENT A <br /> r 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 <br /> and a clear Teflon® bailer or an oil-water interface probe Wells not containing SPH are then <br /> purged of approximately three casing volumes of water (or to dryness) using a centrifugal <br />' pump, gas displacement pump, or bailer Equipment used for the current sampling event is <br /> noted on the attached field data sheets During purging, temperature, pH, and electrical <br /> conductivity are monitored in order to document that these parameters are stable prior to <br /> collecting samples After purging, water levels are allowed to partially recover Groundwater <br /> samples are collected using a Teflon bailer, placed into appropriate EPA-approved <br /> containers, labeled, logged onto chain-of-custody documents, and transported on ice to a <br /> 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 EPA <br /> Method 8015GRO/8021 The five gasoline oxygenates (MTBE, DIPE, ETBE, TAME and <br /> TBA) were analyzed by EPA Method 8260B <br /> 1 <br /> Shaw Environmental,Inc <br /> N 11acDP%20041Pry188018800401 A 4aa doe <br />' A-1 <br /> I <br />