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04 December 2007 AGE-NC Project No. 99-0592 Page 5 of 7 survey: 3.1.1. Drilling and Soil Sampling Utilizing a CME-75HT truck-mounted hollow-stem drill rig equipped with 8.25-inch and 10.25-inch diameter hollow-stem augers,the proposed pilot soil borings for the ground water monitoring wells will be advanced depths of 75 feet and 80 feet bsg. Relatively undisturbed soil samples will be collected from each soil boring at 5-foot intervals, beginning at 5 feet bsg, using a California modified split-spoon sampler fitted with 2-inch diameter, 6-inch long brass sleeves. Upon removal from the sampler,the sample sleeves will be separated with a knife.The exposed ends of the second sleeve will be covered with Teflon sheets,capped,and sealed with tape. Soils 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)equipped with a photo-ionization detector (PID). 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 and transported under chain of custody to a CDPH-certified laboratory for analysis for the constituents listed in Section 2.2. 3.1.2. Well Completion and Well Head Elevation Survey The pilot borings MW5 through MW7 will be completed as a ground water monitoring well utilizing 2-inch diameter,Schedule 40 polyvinylchloride(PVC)blank well casing and 0.020-inch slotted well screen installed from 55 feet to 75 feet bsg. A proposed monitoring well construction diagram is depicted in Figure 3. The pilot boring MW8 will be completed as a ground water monitoring well utilizing 4-inch diameter,Schedule 40 polyvinyl chloride(PVC)blank well casing and 0.020-inch slotted well screen installed from 60 feet to 80 feet bsg. A proposed UST monitoring well construction diagram is depicted in Figure 4. After installing the well casing in each pilot boring, a filter pack material consisting of pre-washed #3 Lapis Lustre sand will be added through the augers from total depth to approximately 2 feet above the screened interval. Following placement of the filter pack, the well will be surged to assist in Advanced GeoEnvironmental,Inc.