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FIELD PROCEDURES <br /> =='1 Page 2 <br /> minimum of 24 hours from the time of development,the water level in the well will be measured, <br /> and the water checked for visual signs of free product. Approximately three to five additional well <br /> volumes of water will then be purged using a clean, check valve system until temperature,pH, and <br /> conductivity readings stabilized and/or the water clears of sediment. The water samples will be <br /> then collected using new polyethylene disposable bailers. Water from the tubing will be decanted <br /> into appropriate sample containers provided by the laboratory. The sample will immediately be <br /> placed in an ice-chest with ice, along with a travel blank, and submitted under chain-of-custody to a <br /> California-certified laboratory for analysis of Total Petroleum Hydrocarbons(TPH)using EPA <br /> method 8015/Purge and Trap, the fuel components Benzene, Toluene,Ethylhenzene and Total <br /> Xylenes(BTEX) and five oxygenates using EPA method 8260B. <br /> Pumping equipment will be cleaned prior to development/purging of the well with a solution of <br /> trisodium phosphate and distilled water to minimize the potential for cross contamination. All <br /> water removed during development and purging operations will be stored in sealed,labeled 55- <br /> gallon drums. <br /> I <br /> I <br /> i <br />