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ATTACHMENT B <br /> FIELD AND LABORATORY PROCEDURES <br /> Groundwater Batch Extraction <br /> Groundwater batch extraction was performed by pumping approximately 200 of water from <br /> the well with a submersible pump <br /> Groundwater Sampling Procedures <br /> The sampling procedure for each well consists first of measuring the water level and <br /> checking for the presence of separate-phase hydrocarbons (SPIT), using either an electronic <br /> indicator and a clear Teflon® bailer or an oil-water interface probe The well was purged of <br /> approximately three casing volumes of water(or to dryness) using a centrifugal pump, gas <br /> displacement pump, or bailer Equipment and purging method used for the current sampling <br /> event is noted on the attached field data sheets During purging, temperature, pH, and <br /> electrical conductivity are monitored in order to document that these parameters are stable <br /> . 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 Teflon bailer, placed <br /> into appropriate EPA-approved containers, labeled, logged onto chain-of-custody documents, <br /> and transported on ice to a California State-certified laboratory <br /> Laboratory Procedures for Groundwater Samples <br /> The groundwater sample was analyzed for the presence of total petroleum hydrocarbons <br /> calculated as gasoline, benzene, toluene, ethylbenzene, xylenes, and MtBE by EPA Method <br /> 8015/8020 These analyses were performed by utilizing a purge and trap extraction <br /> technique, with final detection was by gas chromatography using flame- and photo-ionization <br /> detectors The sample was also analyzed for Oil and Grease by EPA Method 413 1, purgable <br /> organica by EPA Method 624, and lead by EPA Method 6010 The methods of analysis for <br /> the groundwater samples are documented in the certified analytical report The certified <br /> analytical report and chain-of-custody documentation are presented as Attachment D <br /> Purge and Rinsate Water Disposal <br /> Water generated during well sampling and equipment cleaning is pumped into a SECOR truck mounted water <br /> tank The water is transported to ARCO's holding facility in West Sacramento,California,for temporary <br /> storage Water is then transported by Integrated Waste Management(IWM)to Seaport Environmental in <br /> Redwood City,California for disposal <br /> 077 42023 1401hatchextraction doc December 11,2000 <br />