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ATTACHMENT 1 <br /> FIELD AND LABORATORY PROCEDURES <br /> SAMPLING PROCEDURES <br /> Sampling equipment is thoroughly cleaned prior to each sample The sampling procedure for each <br /> well includes measuring the water level and checking for the presence of separate-phase <br /> hydrocarbons (SPH), using either an electronic indicator and a clear Teflon® bailer or an oil-water <br /> interface probe Wells not containing SPH are purged of approximately three casing volumes of <br /> water (or to dryness) using a submersible pump, centrifugal pump, gas displacement pump, or bailer <br /> The equipment and purging method used for the current sampling event are noted on the attached <br /> field data sheets During purging, temperature, pH, and electrical conductivity are monitored in order <br /> to document that these parameters are stable prior to collecting samples After purging, water levels <br /> are allowed to partially recover Groundwater samples are collected using a disposable Teflon@ <br /> bailer, placed into appropriate EPA-approved containers, labeled, logged onto chain-of-custody <br /> documents, and transported on ice to a California state-certified laboratory <br /> LABORATORY PROCEDURES <br /> The groundwater samples are analyzed for the presence of TPHg, BTEX, fuel oxygenates (MtBE, <br /> TAME, DIPE, EtBE, TBA, and Ethanol), and lead scavengers 1,2-DCA and EDB using EPA Method <br /> 8260B The method of analysis for the groundwater samples is documented in the certified <br /> • laboratory analytical report The certified laboratory analytical report, chain-of-custody <br /> documentation, and field data sheets are presented as Attachment 2 <br /> PURGE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning is pumped into a SECOR truck- <br /> mounted water tank The water is transported to ARCO's holding facility in West Sacramento, <br /> California, for temporary storage Once the ARCO holding tank has reached capacity, URS <br /> Corporation (URS) coordinates the transport of the purge water by Integrated Waste Management <br /> (IWM) to Seaport Environmental in Redwood City, California for disposal A purge water disposal bill <br /> of lading is included in Attachment 2 <br /> i <br />