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the current sampling event is noted on the attached field data sheets. During purging, <br /> P g <br /> 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 <br /> partially recover. Groundwater samples (both purge and no purge) are collected using a <br /> Teflon bailer, placed into appropriate EPA-approved containers, labeled, Iogged onto chain- <br /> of-custody documents, and transported on ice to a California State-certified laboratory. <br /> Laboratory Procedures for Groundwater Samples <br /> The groundwater samples were analyzed for the presence of total petroleum hydrocarbons <br /> calculated as gasoline, benzene, toluene, ethylbenzene, xylenes, and MtBE by DHS LUFT <br /> Method. Fuel oxygenates were analyzed by EPA Method 8260. These analyses were <br /> performed by utilizing a purge and trap extraction technique, with final detection was by gas <br /> chromatography using flame- and photo-ionization detectors. The methods of analysis for the <br /> groundwater samples are documented in the certified analytical report. The certified analytical <br /> report, chain-of-custody documentation, and field data sheets are presented as Attachment C. <br /> 7G600-022-02/well install.doc C-2 July 7, I999 <br />