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4 <br /> . rl <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 /> 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 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 /> IT CORPORATION <br /> SAC\\\SACRFPINCOMMON\saeDP\2001\PRAPJS\8800401A lab doc-011it 1 <br /> (01070000) <br /> A-1 <br />