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27 'March 2000 AGE-NC Project No. 98-0450 Page 17 of ]9 A "pilot-soil boring will he advanced using hollow-stem auger drilling techniques. Soil samples will be collected from each soil boring at five-loot intervals. x.4.1 . Soil Sampling Relatively undisturbed soil samplers will be collected from the boring using a California modified split-spoon sampler fitted with three 2-inch diameter, 6-inch long brass sleeves. Upon removal from the sampler. the sample sleeves will be separated. The exposed ends of the second sleeve will he covered with Teflon sheets, capped and sealed with tape. Soil sampled in the borings will be visually- classified by an AGE geologist in accordance with the Unified Soil Classification System (USCS). Additionally, soil samples will be field-screened for the presence of volatile organic compounds using an organic vapor meter (OVM). Soil sample descriptions and OVM readings will be recorded on a log for each boring. Following sample collection. each preserved sample sleeve will be labeled with the boring location. depth, time. date and sampler's initials. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of=custody to a DI IS-certified laboratory. Soil cuttimps generated during drilling of the soil borings will be contained within plastic sheeting on the site for storage. Drums containing decontamination water and soil cutting will he stored oil- site pending appropriate removal, disposal and/or treatment. x.4.2. Monitoring. Well Completion The monitorim, well pilot boring will be completed using hollow-stem auger drilling techniques. Soil borings will be advanced using a truck.-moEnited drill rig equipped with hollow-stem augers. The boring for the ground water monitoring well will be advanced utilizing 8-inch hollow stem augers_ Proposed monitoring well design is illustrated in Ficure 9. Following completion ofthe soil boring for the monitoring well a 2-inch diameter Schedule 40 PVC 0.030-inch slotted well screen and casing w 2 ill be installed. A20-foot section of well screen will be installed from a depth of 40 feet to 60 feet bsg. The casing. filter pack and well sealing materials will be placed into the borehole through the interior of the hollow-stem augers. After installing the well casing, filter pack material consisting of pre- washed 43 Lonestar sand will be added from the bottom ofthe borehole to approximately two feet above the screened interval_ Following placcmcnt of the filter pack, the well will be surged to assist in settling the filter pack. Additional sand will be added if settling occurs. A nominal two-tbot bentonite seal will be placed above the filter pack to minimize the potential of grout penetration into the screened section ofthe well. The bentonite seal will be formed by pouring hentonite chips into Advancerd(;C0 FI%iroijIII cnlal,lac.