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ATTACHMENT A <br /> FIELD AND LABORATORY PROCEDURES <br /> Sampling Procedures <br /> The sampling procedure for each well consisted first of measuring the water level and <br /> checking for the presence of separate-phase hydrocarbons (SPH), using either an elec- <br /> tronic indicator and a clear TeflonO baileror an oil-water interface probe. Wells not <br /> containing SPH are then sampled without purgi g. Groundwater samples were then <br /> collected using a Teflon bailer, placed into appropriate EPA-approved containers, labeled, <br /> logged onto chain-of-custody documents, and transported on ice to a California State- <br /> certified laboratory. <br /> I <br /> Laboratory Procedures <br /> The groundwater samples were analyzed for the presence of total petroleum hydrocarbons <br /> calculated as gasoline, benzene, toluene, ethylbenzene, xylenes, and methyl tertiary butyl <br /> ether by EPA Methods 8015 (modified) and 8020. These analyses were performed by <br /> utilizing a purge and trap extraction techniqu�, with final detection was by gas <br /> chromatography using flame- and photo-ionization detectors. The methods of analysis <br /> for the groundwater samples are documented in the certified analytical report.. The <br /> certified analytical report, chain-of-custody documentation, and field data sheets are <br /> presented as Attachment B. <br />