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SOIL SAMPLING METHODS <br /> Sampling will be conducted in accordance with the <br /> following three regulatory documents: (1) Regional Board Staff <br /> Recommendations for Initial Evaluation and Investigation of <br /> Underground Tanks, Tri-Regional Recommendations (California <br /> Regional Water Quality Control Board [CRWQCB] May 1989) ; <br /> (2) Regional Board Staff Recommendations for Initial Evaluation and <br /> Investigation of Underground Tanks, Tri-Regional Recommendations, <br /> Appendix A: Central Valley Regional Board Reporting Requirements <br /> (CRWQCB, April 1989) ; and (3) Leaking Underground Fuel Tank (LUFT) <br /> Field Manual: Guidelines for Site Assessment, Cleanup, and <br /> Underground Storage Tank Closure (CRWQCB, October 1989) . A letter <br /> of acknowledgment and a signed Authorization to Release Analytical <br /> Data form is included as an attachment to this letter. <br /> During sampling, the geologist will use a PID to <br /> characterize the relative levels of hydrocarbons in the soil and <br /> note any subjective evidence of hydrocarbons such as obvious <br /> product odor and discoloration. Field instruments such as the PID <br /> are useful for indicating relative levels of hydrocarbon vapors, <br /> but do not detect the concentration of hydrocarbons present with <br /> the same precision as laboratory..analyses. <br /> During sampling, the soil will be brought to the ground <br /> surface in an excavator bucket, and the outer soil will be scraped <br /> away. A clean, 6-inch-long, 2 1/2 inch-diameter, clear brass tube <br /> will be driven into the soil using a percussion sampler. The brass <br /> tube will be removed and the ends covered with aluminum foil and <br /> plastic end caps and taped. The tube will be labeled and <br /> immediately placed on ice for transport to the laboratory. Chain <br /> of Custody Records will be maintained throughout delivery to the <br /> laboratory. <br /> Soil samples will also be collected from the stockpiled <br /> soil to evaluate treatment and disposal options. Four soil samples <br /> will be collected for every 50 cubic yards of stockpiled soil. <br /> Each group of four samples will be composited into one sample by <br /> the laboratory. Soil samples will be collected in clean brass <br /> tubes from approximately 18 inches below the, surface of the <br /> stockpiles. <br /> /GENERAL/3/SOILSAMP.MTH <br />