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r 1 <br />L_J <br />ATTACHMENT A <br />FIELD AND LABORATORY PROCEDURES <br />Sampling Procedures <br />The sampling procedure for each well consists of measuring the water level and checking for <br />the presence of separate -phase hydrocarbons (SPH), using either an electronic indicator and a <br />clear Teflon® bailer or an oil -water interface probe. Wells not containing SPH are then <br />purged of approximately three casing volumes of water (or to dryness) using a clean <br />centrifugal pump, gas displacement pump, or bailer. The equipment and purging method <br />used for the current sampling event are noted on the attached field data sheets. During <br />purging, temperature, pH, and electrical conductivity are monitored in order to document that <br />these parameters are stable prior to collecting samples. After purging, water levels are <br />allowed to partially recover. Groundwater samples are collected using a clean Teflon bailer, <br />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 />Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), <br />benzene, toluene, ethyl -benzene, xylenes (BTEX compounds) and fuel oxygenates methyl - <br />tertiary -butyl -ether (MtBE), ethyl -tertiary -butyl -ether (ELBE), diisopropyl ether (DIPE), <br />tertiary -amyl -methyl -ether (TAME), tertiary -butyl -alcohol (TBA), 1,2 dichloroethane (1,2 - <br />DCA), and ethylene dibromide (EDB), methanol, and ethanol by EPA Method 8260. The <br />methods of analysis for the groundwater samples are documented in the laboratory analytical <br />report. The laboratory analytical report and chain -of -custody documentation are presented as <br />Attachment B. <br />Purge and Rinsate Water Disposal <br />Water generated during well sampling and equipment cleaning was pumped into a SECOR <br />truck mounted water tank. The water was then transferred to the operating GWE system <br />where it was treated and then discharged to the industrial wastewater stream. <br />0 <br />