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• <br /> of containers used, and properly executed chain of custody form. Pertinent information will be <br /> entered into a log book kept by the laboratory. In addition to routine calibration of analytical <br /> instruments with standards and blanks, the analyst is required to run duplicates and spikes to <br /> assure an added measure of reliability and precision. <br /> 6.4 DECONTAMINATIONPROCEDURES <br /> Decontamination of sampling equipment and heavy equipment shall be completed within the <br /> decontamination area. In addition, if the trucks were in contact in an area of the site where soil <br /> contaminants have not been removed(i.e.,where soil is being loaded directly from the <br /> excavation areas),it will be necessary to decontaminate trucks before leaving the site. The <br /> following sections describe the decontamination procedures for sampling equipment and hand <br /> tools and for heavy equipment. <br /> Sampling equipment that is reused between sampling locations will require decontamination <br /> between each sampling location. The decontamination procedure for this equipment is as <br /> follows: <br /> 1. Large particles of soil will be first be removed from the equipment or tools <br /> 2. Wash tools in a non-phosphate detergent solution, <br /> 3. Rinse once with tap water, <br /> 4. Rinse twice with distilled water, <br /> 5. Dry off using a new, clean paper towel (single use only). <br /> The rinse water will be contained in a DOT-approved 55-gallon drum pending disposal at <br /> completion of the work. <br /> All heavy equipment and trucks (if needed)will be cleaned prior to leaving the contractor's yard <br /> and before leaving the site. <br /> 6.5 BACKFILLINGEXCAVATIONS <br /> Backfilling the excavations will be completed according plans and specifications prepared for the <br /> site development project as applicable. ROKEN notes that the backfilling plans will include the <br /> following: <br /> Imported fill should be certified clean fill, according to the California EPA DTSC <br /> advisory.9 <br /> The backfill should be compacted to meet construction standards and leveled to grade. <br /> Geotechnical testing should be conducted on the compacted soil to verify that the compaction <br /> requirements have been achieved. <br /> 9 DTSC Information Advisory Clean Imported Fill Material,October 2001. <br /> 11 <br />