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ATTACHMENT II <br /> GROUNDWATER SAMPLING AND ANALYSIS PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior to use in each well The sampling procedure for each <br /> well consists first of 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 that do not have submerged screens are then sampled without <br /> purging Wells that have submerged screens are purged of approximately three casing volumes of water <br /> (or to dryness) using a centrifugal pump, gas displacement pump, or bailer The equipment and purging <br /> method used for the current sampling event is noted on the attached field data sheets During purging, <br /> temperature, pH, and electrical conductivity are monitored in order to document that these parameters are <br /> stable prior to collecting samples After purging, water levels are allowed to partially recover <br /> Groundwater samples (both purge and no-purge) are collected using a TeflonO bailer, placed into <br /> appropriate EPA-approved containers, labeled, logged onto chain-of-custody documents, and transported <br /> on ice to a California state-certified laboratory <br /> Laboratory Procedures <br /> The groundwater samples are analyzed for the presence of TPHg, benzene, toluene, ethylbenzene, and <br /> xylenes (total) using EPA Methods 8015 (modified) and 8020, and fuel oxygenates and volatile organic <br /> compounds (VOCs) using EPA Method 8260B The methods of analysis for the groundwater samples are <br /> documented in the certified analytical report The certified analytical report, chain-of-custody <br /> documentation, and field data sheets are presented as Attachment B <br /> Purge and Rmsate Water Disposal <br /> Water generated during well sampling and equipment cleaning is pumped into a truck-mounted water tank <br /> The water is transported to the Blain Tech holding facility in Roseville, California, for temporary storage <br /> Water is then transported by Dillard Environmental Services to Altamont Landfill and Disposal Facility in <br /> Altamont, California for disposal <br />