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u r � <br /> File No. 2070-2 <br /> 19 September 1988 <br /> confirm containment levels or absence or contamination. Analysis <br /> will be performed for total petroleum hydrocarbons, BTX, and <br /> organic lead. <br /> 14. To prevent cross-contamination between samples, the sampler. <br /> will be cleaned with TSP and water after each sampling. To <br /> prevent cross-contamination between boreholes, the sampler and <br /> drill stems will be cleaned using both TSP solution and steam <br /> cleaning. <br /> 15. Brill cuttings with possible contamination will be deposited <br /> in barrels and left on site. If the cuttings are shown by <br /> laboratory analysis to be contaminated, they will be dealt with <br /> in a manner consistent the site remediation and state <br /> regulations. <br /> 10. The borings will be converted to two inch diameter <br /> groundwater monitoring wells. The wells will consist of a <br /> slotted section (0.02 inch slot) of flush threaded, two inch PVC <br /> pipe (conforming to ASTM F480 and NSA' w-c specifications) placed <br /> in the groundwater zone (15 feet below the water table and 5 feet <br /> above) , and an unslotted section above the groundwater. No glues <br /> or solvents will. be used in the pipe assembly. A coarse sand <br /> (grade depending on soil, type) will form the filter pack, and the <br /> well will be sealed with bentonite and portland cement. A <br /> traffic rated, lockable well cover will complete the well at the <br /> ground surface. <br /> 17. The wells will be developed by hand bailing or air lift <br /> pumping, and surging until turbidity is minimal. Water removed <br /> during development will be placed in barrels. (If, by laboratory <br /> analysis, the water is found to be contaminated, it will also be <br /> dealt with in the site remediation.) Groundwater samples will be <br /> obtained by Teflon bailer, placed in precleaned and preserved <br /> sample containers, and analyzed for TPH, BTX, and lead. <br /> 18. Well head elevations will be determined by level survey. <br /> The water levels in the new wells and the previous wells will be <br /> measured in order to determine the local groundwater gradient. <br /> Additional Soil Borings <br /> 19. Two additional soil borings will be drilled on either side <br /> (west and east) of the tank excavation, each to a depth of 25-30 <br /> feet. Hollow stem augers will be used. The soil will be <br /> continuously core sampled in order to obtain a complete soil <br /> profile. <br /> -4- <br />