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r 11 November 2004 AGE-NC Project No 99-0624 ' Page 11 of 13 ' volumes of soil vapor or ambient air Is evacuated through the sampling system The vacuum Is then applied to the chamber,creating a negative pressure on the inside of the sample Tedlar bag The bag then fills with vapor from the subsurface, allowing the sample to enter directly into the Tedlar bag' ' On complete collection of the gas sample, the negative pressure in the chamber is reduced and the sampling bag sealed Upon collection, each sample will be Iabeled, logged on a chain of custody form and place into a dry cooler Samples will be delivered to a State-certified laboratory for analysis ' of BTEX by EPA Method 8021 After collection of the sample, soil gas from the polyethylene tubing will be monitored for the ' presence of volatile organics using a photo-ionization detector(PID)pre-calibrated to isobutylene ' 5 3 PILOT SOIL BORING Five pilot soil borings will be advanced at the site to the specified total depths utilizing a truck- mounted hollow-stem drill ng with 8-inch or 10-inch diameter hollow-stem augers to install ground water monitoring wells Soil samples will be collected from each soil boring at five-foot Intervals Relatively undisturbed soil samples will be collected in each of the borings 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 I 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 I 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 procedures to a DHS-certified laboratory ' 5 4 WELL COMPLETION AND WELL ELEVATION SURVEY One 8 25-inch diameter pilot boring will be single-completed as ground water monitoring well utilizing a 20-foot section of 2-inch diameter Schedule 40 polyvinylchloride (PVC) 0 020-inch slotted well screen and blank well casing extended to surface grade Three 8 25-inch diameter pilot bonngs will be single-completed as ground water monitoring well utilizing a 10-foot section of I2-inch diameter Schedule 40 PVC 0 020-inch slotted well screen and blank well casing extended to + surface grade The 10-inch diameter pilot boring will be single-completed as a ground water IAdvanced GeoEnvironmental,Inc i I