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i • . 26 September 2000 AGE-NC Project No 96-0263 Page 8 of 10 Proposed soil boring locations are illustrated on Figure 2 Following borehole advancement,portland cement (grout mix)will be utilized to backfill each borehole utilizing a tremie pipe The PHS-EIID and the RWQCB will be given the opportunity to Inspect the grout mix prior to backfilling activities 4 2 MONITORING WELL PILOT BORING DRILLING AND SOIL SAMPLING Sall borings will be advanced utilizing a truck-mounted, hollow-stem drill rig and 8-Inch diameter hollow-stern augers Cuttings generated during drilling activities will be placed on plastic sheeting and covered Rinseate will be contamenzed in properly labeled D O T approved 55-gallon drums, and stored on-site in an area lacking public access Disposal alternatives will be evaluated based on results of soil and water analysis Soil samples will be collected at five-foot Intervals, beginning at a depth of 5 feet bsg, utilizing a California split-spoon sampler and brass sleeves The sampler will be driven by dropping a 140- pound weight from a height of 30 inches (blow counts) The blow counts will be recorded on boring logs Upon soil sample retrieval,the middle brass sleeve will be removed from the sampler The ends of the brass sleeve will be immediately covered with Teflon or aluminum sheets, sealed with plastic end caps, secured with tape and Immediately placed in a chilled container for transportation under chain of custody to a state-certified laboratory Each sample sleeve will be labeled with the boring location, sample depth, sample time, sampling date and sampler's initials During sampling activities, sample duplicates will be monitored for the presence of organic vapor using a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) and will be visually described on boring logs using the Unified Soil Classification System (USCS) All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox All hollow stem augers will be steam-cleaned prior to advancement of each borehole 43 WELL COMPLETION Soil borings will be single-completed as ground water monitoring wells utilizing 2-inch diameter schedule 40 polyvinylchlonde (PVC) 0 010-inch slotted well screen and blank well casing Based on geologic/hydrogeologic conditions, a 15-foot length of well screen is anticipated for installation of monitoring wells, the bottom of the screen interval will be placed 10 feet below the water table A proposed well construction diagram is depicted in Figure 3 Advanced GeoEnvtron mental,Inc