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05 November 2007 <br />AGE-NC Project No. 06-1481 <br />Page 6 of 7 <br />equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings using a hydraulic <br />hammer to drive soil sampling tools to specified depths. <br />4.2. SOIL SAMPLING PROCEDURES <br />Soil boring will be sampled at discreet five-foot intervals using a 1.125" Geoprobe soil sampling <br />assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of the second <br />sleeve will be covered with Teflon sheets, capped and sealed with tape. <br />Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br />transported under chain-of-custody procedure to a DHS-certified laboratory. Each sample sleeve will <br />be labeled with the boring designation, depth, time, date and sampler's initials. Soils encountered in <br />the borings will be visually classified by an AGE geologist in accordance with the Unified Soil <br />Classification System (USCS). Additionally, soil samples will be field-screened for the presence of <br />volatile organic compounds using an organic vapor meter (OVM), equipped with photo-ionization <br />detector (PID). <br />4.3. GRAB GROUND WATER SAMPLING PROCEDURES <br />For the collection of grab ground water samples, soil probe borings will be advanced to the top of <br />the ground water table as identified by collection of a saturated soil sample. Once ground water has <br />been encountered, a Geoprobe push-driven water sampling device will be advanced four to five feet <br />into the water-bearing zone. Grab ground water sample will be collected using a Geoprobe water <br />sampling assembly fitted with a pre-cleaned, one-inch diameter 0.01-slotted temporary well screen. <br />The ground water sample will be extracted by lowering a polyethylene bailer through the hollow <br />center of the push rods into the screen section. <br />Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br />transported under chain-of-custody procedure to a DHS-certified laboratory. Each sample container <br />will be labeled with the boring designation, time, date and sampler's initials. <br />4.4. SOIL VAPOR SAMPLING PROCEDURES <br />Soil vapor samples will be obtained at a depth of approximately 5 feet bsg in each soil vapor boring. <br />Samples will be collected using a Geoprobe soil vapor assembly. An expendable vapor point will <br />be placed into a point holder at the bottom of a string of 1-inch diameter hollow drive rods. The <br />assembly will then be advanced to the specified depth and retracted between six inches in order to <br />Advanced GeoEnvironmental, Inc.