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■Y01 INC- <br /> The sampler will be washed with a non-phosphate cleaner and double rinsed with water after each use. <br /> Auger flights will be steam cleaned after drilling each borehole. This will assure that contamination is <br /> not transferred to other boreholes. The cleaning will I ake place on established cleaning sites and the <br /> effluent will be contained. <br /> Uncontaminated boreholes (as determined by OVM filed tests)will be backfilled with the same <br /> material or cuttings extracted from the hole during drilling after placing five feet of bentonite in the <br /> bottom of the hole. Boreholes found to have contami iiated soil will be backfilled with a cement and <br /> sand slurry containing no more than five percent bentonite. The cuttings from these holes will be <br /> placed in United States Environmental Protection Agency (USEPA)-approved, 55-gallon barrels with <br /> lids, stored onsite pending laboratory analysis and disposed of at an approved facility if necessary, <br /> with the appropriate chain-of-custody documents. W thin 30 days, a mitigation report will be <br /> submitted to the Department of Environmental Health Services which will include three remediation <br /> methods. The report will be signed by a Registered eulogist or a Registered Civil Engineer. <br /> 3.2 Soil Sampling from Excavation <br /> The soil sampling.probe for a two-inch drive sampler will be used to collect undisturbed samples from <br /> the trench floor or sidewalls. If possible, undisturbed samples will be obtained from the excavator <br /> bucket as appropriate. <br /> Upon recovery, two sample tubes, designated A and 13, will be sealed by covering with aluminum foil, <br /> capping with plastic and sealing with cloth tape. This sample recovery method minimizes head space <br /> in the sample tubes. The samples will then be stored on ice pending delivery to a certified laboratory <br /> for chemical analysis and accompanied by appropria chain-of-custody documents. Sample <br /> descriptions will include lithology, moisture content, fossil content and odor. Samples will also be <br /> checked with an OVM. Lithologic logs for each excavation will be compiled utilizing the sample <br /> descriptions. <br /> 08420010.001 3 <br />