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r <br /> r <br /> • <br /> r <br />' ATTACHMENT 1 <br /> FIELD AND LABORATORY PROCEDURES <br /> 1 <br /> Sampling Procedures <br /> The sampling procedure for each well consists first of measuring the water level and checking for the <br />' presence of separate-phase hydrocarbons (SPH), using either an electronic indicator and a clear Teflon® <br /> bailer or an oil-water interface probe Wells not containing SPH are then purged of approximately three <br /> casing volumes of water(or to dryness) using a centrifugal pump, gas displacement pump, or bailer <br />' Equipment used for the current sampling event is noted on the attached field data sheets During <br /> purging, temperature, pH, and electrical conductivity are monitored in order to document that these <br /> parameters are stable prior to collecting samples After purging, water levels are allowed to partially <br /> r recover Groundwater samples are collected using a disposable bailer, placed into appropriate EPA- <br /> approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a <br /> California State-certified laboratory <br /> Laboratory Procedures <br /> r Groundwater samples collected were analyzed for the presence of TPHg and BTEX using EPA <br /> Methods 8015GRO/8021B The five gasoline oxygenates (MTBE, DIPE, ETBE, TAME and TBA), EDB, <br /> and 1,2-DCA were analyzed by EPA Method 8260B <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> r <br /> 1 <br /> • <br /> r <br /> 1 <br />