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23 July 1999 <br /> AGE-NC Project No. 99-0628 <br /> Page 5 of S <br /> 4.2. SOIL SAMPLING PROCEDURES <br /> Relatively undisturbed soil samples will be collected in each of the excavations or borings using a <br /> California modified split-spoon sampler fitted with 2-inch diameter, 6-inch long brass sleeves. Upon <br /> removal from the sampler, the sample sleeves will be separated with a clean soil knife. The exposed <br /> ends of the first sleeve will be covered with Teflon sheets. capped and sealed with tape. Native soil <br /> encountered in the borings will be visually classified by an AGE geologist in accordance with the <br /> Unified Soil Classification System (USCS), if appropriate. Additionally, soil samples will be field <br /> screened for the presence of volatile organic compounds using an organic vapor meter (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 to a DTSC-certified 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 augers will be cleaned prior to advancement at each <br /> excavation/boring location. <br /> 4.4. BORING ABANDONMENT <br /> All excavationsyborings will be permanently sealed to prevent vertical migration of contaminants. <br /> Soil borings shall be abandoned by backfilling with bentonite or cement-bentonite slurry from the <br /> total depth to surface grade. <br /> A dvanced GcoEnvironmrntal.Inc. <br />