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ATTACHMENT A <br />' FIELD AND LABORATORY PROCEDURES <br /> e <br /> Sampling Procedure <br /> p g s <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 TeflonO 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 Iaboratory <br /> Laboratory Procedures <br />' Groundwater samples collected ected 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, DIPS, <br /> ETRE, TAME and TBA) were analyzed by EPA Method 8260 <br /> 1 <br /> 4•- --Shaw Environmental&Infrastructure,Inc <br /> SAC I1ISACRFPIICOMMQN1sacDP120021PiiJIPJ8188018800401A 2aD doc-011it 1 <br /> (01070000) <br /> A-1 <br />