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07 June 1999 <br /> AGE-NC Project No. 99-0616 <br /> Page 4 of 4 <br /> 4.2. SOIL SAMPLING PROCEDURES <br /> Soil samples will be collected using Geoprobe push-driven 2-inch diameter discrete and/or <br /> continuous core samplers fitted with four six-inch long brass sleeves or a two-foot long acetate <br /> sleeve, respectively. Upon removal from the sampler, the sample sleeve is separated with a clean <br /> soil knife.The exposed ends of the sleeve will be covered with Teflon sheets,capped and sealed with <br /> tape. Soils encountered in the borings will be visually classified by an AGE geologist in accordance <br /> with the Unified Soil Classification System(USCS).Additionally,soil samples will be field screened <br /> for the presence of volatile organic compounds using an OVM. <br /> Following sample collection, each preserved sample sleeve will be labeled with the boring location, <br /> depth,time, date and sampler's initials. Appropriately sealed and labeled samples will be placed in <br /> a chilled container under ice and transported under chain-of-custody procedure to a DTSC-certified <br /> laboratory. <br /> 4.3. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox. All probing rods will be cleaned prior to advancement at each <br /> probe boring location. <br /> 4.4. BORING ABANDONMENT <br /> All soil borings will be permanently sealed to prevent vertical migration of contaminants. Soil <br /> borings shall be abandoned by backfilling with bentonite or cement-bentonite slurry from the total <br /> depth to surface grade. <br /> Advanced GeoEnN iron menta 1,Inc. <br />