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09 April 2002 <br /> AGE-NC Project No 95-0141 <br /> Page 10 of 13 <br /> 42 WELL DRILLING AND SOIL SAMPLE COLLECTION <br /> Ground water monitoring well pilot borings will be advanced utilizing a truck-mounted,hollow stem <br /> drill rig utilizing 8 25-inch diameter hollow-stem augers The ground water extraction well pilot <br /> boring will be advanced utilizing a truck-mounted, hollow stem drill rig utilizing 10-inch diameter <br /> hollow-stem augers Cuttings and rinseate generated during drilling will be containerized in properly <br /> labeled DOT-approved 55-gallon drums, and stored on-site Disposal alternatives will be evaluated <br /> based on results of soil and water analysis <br /> Soil samples will be collected from the pilot borings for the monitoring wells located southwest and <br /> northwest of the former UST location, contamination in soil has been defined east and southeast of <br /> the former UST location Soil samples will be collected at five-foot intervals beginning at a depth <br /> of 5 feet bsg to total depths of the borings Soil samples will be collected utilizing a California <br /> split-spoon sampler fitted with 2-inch diameter, 6-inch long brass sleeves The sampler will be <br /> driven by dropping a 140-pound weight from a height of 30 inches (blow counts) and record the <br /> number of blow counts on the boring logs Upon soil sample retrieval, the exposed ends of the <br /> second sleeve will be immediately covered with Teflon or aluminum sheets, sealed with plastic end <br /> Icaps, secured with tape and immediately placed in a chilled container for storage pending <br /> ie transportation to a state-certified laboratory Each sample sleeve will be labeled with the boring <br /> location, sampling depth, time, date and sampler's initials <br /> Sample duplicates will be monitored in the field for the presence of organic vapor using a photo- <br /> ionization detector (PID) equipped with an organic vapor meter (OVM) and will be visually <br /> Edescribed on boring logs using the Unified Soil Classification System(USCS) <br /> 43 WELL INSTALLATION <br /> Following completion of monitoring well and extraction well drilling, a 2-inch diameter or 4-mch <br /> Idiameter, respectively, Schedule 40 PVC 0 010-inch slotted well screen and casing will be installed <br /> For the shallow monitoring wells and the extraction well, a 20-foot length of well screen will be <br /> installed from 15 feet bsg to 35 feet bsg The well section will be placed across the top of the <br /> saturated zone with a portion of the well screen section extending five feet above the water table For <br /> the deep monitoring wells, a 5-foot length of well screen will be installed from 60 feet bsg to 65 feet <br /> bsg <br /> After installing the well casing, filter pack material consisting of pre-washed #3 Lonestar sand will <br /> Ibe added from the bottom of the borehole to approximately two feet above the screened interval <br /> Advanced GeoEnvironmental,Inc <br />