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17 January 2003 <br /> AGE-NC Project No. 02-0946 <br /> Page 7 of 9 <br /> 4.1. SOIL BORINGS <br /> Four soil borings will be advanced at the site for soil sample collection and installation of ground <br /> water monitoring wells. Soil borings will be advanced utilizing a truck-mounted drill rig equipped <br /> with 8.25-inch hollow stem augers. The proposed borings will be advanced as follows: <br /> • One soil boring to 45 feet in the former UST excavation area between UST 1 and UST 2 for <br /> soil sample collection only; and <br /> • Three soil borings to approximately 45 feet bsg for collection of soil samples and installation <br /> of ground water monitoring wells. <br /> 4.2. SOIL SAMPLING PROCEDURES <br /> The soil borings will be advanced using a truck-mounted drill rig. The soil borings will be sampled <br /> at five-foot intervals from 5 feet bsg to the total depth of the boring. Relatively undisturbed soil <br /> samples will be collected ahead of the drill bit using a California modified split-spoon sampler fitted <br /> with 2-inch diameter by 6-inch long brass sleeves. Upon removal from the sampler, the sample <br /> sleeves will be separated with a clean knife. The exposed ends of the second sleeve will be covered <br /> with Teflon sheets, capped and sealed with tape. Soils encountered in the borings will be visually <br /> classified by an AGE geologist in accordance with the Unified Soil Classification System (USCS). <br /> Additionally, soil samples will be field-screened for the presence of volatile organic compounds <br /> using an OVM. <br /> Following sample collection, each preserved sample sleeve will be labeled with the boring location, <br /> depth, time, date and sampler's initials. Appropriately sealed and labeled samples will be placed in <br /> a chilled container under ice and transported under chain-of-custody procedure to a DHS-certified <br /> laboratory. <br /> 4.3. WELL INSTALLATION <br /> Following completion of drilling and sampling of the soil borings,2-inch diameter Schedule 40 PVC <br /> 0.010-inch slotted well screen and casing will be installed into each of the borings. Based on the <br /> depth of the boring and the ground water table, a 20-foot length of well screen will be installed. It <br /> is anticipated that the well section will be placed across the observed water table with approximately <br /> 15 feet of screen section installed within the saturated interval and approximately 5-feet of screen <br /> section extending above the water table. <br /> Advanced GeoEnvironnientai, Inc. <br />