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j i • <br /> • 15 January 1998 <br /> AGE-NC Project No 96-0254 <br /> Page 12 of 16 <br /> 4 1 4 Boring Abandonment <br /> All probe borings will be permanently sealed to prevent vertical migration of contaminants Soil <br /> borings shall be abandoned by backfilling with cement slurry from the total depth to surface grade <br /> 4 2 INSTALLATION OF GROUND WATER MONITORING WELLS <br /> 4 2 1 Soil Sampling Procedures <br /> Soil borings will be advanced using hollow-stem auger drilling techniques Soil samples will be <br /> collected from each soil boring at five-foot intervals Relatively undisturbed soil samples will be <br /> collected in each of the borings using a California modified split-spoon sampler fitted with 2-inch <br /> diameter, 6-inch long brass sleeves Upon removal from the sampler, the sample sleeves will be <br /> separated with a clean soil knife The exposed ends of the second sleeve will be covered with Teflon <br /> sheets, capped and sealed with tape Soils sampled in the borings will be visually classified by an <br /> AGE geologist in accordance with the Unified Soil Classification System(USCS) Additionally, soil <br /> • samples will be field screened for the presence of volatile organic compounds using an organic vapor <br /> meter(OVM) Soil sample descriptions and OVM readings will be recorded on a log for each boring <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 DHS-certified <br /> laboratory <br /> Soil cuttings generated during drilling of the soil borings will be contained within plastic sheeting <br /> on the site for storage Drums containing decontamination water and soil cutting will be stored on- <br /> site pending appropriate removal, disposal and/or treatment <br /> 4 2 2 Monitoring Well Installation <br /> The monitoring well boring will be completed using hollow-stem auger drilling techniques Soil <br /> borings will be advanced using a truck-mounted drill rig equipped with hollow-stem augers <br /> The pilot boring for PMW2 will be advanced utilizing 8 25-inch augers The pilot boring for PMW 1, <br /> a dual-completed ground water monitoring well, will be advanced with 10-inch augers Proposed <br /> monitoring well designs are illustrated in Figures 6 and 7 <br /> Advanced GeoEnviron mental, Inc <br />