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N ' 24 October 2001 AGE-NC Project No . 01 -0877 Page 6 of 7 4. 1 . PROBE BORING ADVANCEMENT Probe borings will be advanced using a van-mounted Geoprobe 5400 direct-push probing unit equipped with 1 . 125-inch probing rods. The Geoprobe advances soil probe borings using hydraulic pressure and a pneumatic hammer to drive soil sampling tools to specified depths: 4.2. SOIL SAMPLING COLLECTION AND ANALYSIS Soil borings will be sampled at discreet five-foot intervals using a 1 .25 " Geoprobe soil sampling assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of a selected soil-filled sleeve, generallythe second leading sleeve willbe coveredwith Teflon sheets, capped and sealed with tape. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-eustodyto aDHS-certified laboratory. Each sample sleeve willbe labeled with the boring designation, depth, time, date and sampler's initials. Soils encountered inthe 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 thepresence of volatile organic compounds using an organic vapor meter (OVM), equipped with photo-ionization detector (PID). 4.3. GRAB GROUND WATER SAMPLING AND ANALYSIS Forthe collection of `grab ' groundwater samples, selected probe borings will be advanced to a depth of four feet below the ground water surface. The grab ground water samples will be collected using a Geoprobe water sampling assembly with a wire-wound steel screen or a pre-cleaned one-inch diameter, 0.01 -inch slotted PVC screen. Each ground water sample will be extracted by lowering a Teflon bailer through the hollow center of the push rods into the screened section. Samples will be collected into laboratory-supplied, 40-m1 VOA vials containing 0.5 ml hydrochloric acid as sample preservative and into one-liter amber bottles without a preservative. The labeled containers will be placed in a chilled container under ice and transported under chain-of-custody to a DHS-certified laboratory. 4.4. EQUIPMENT DECONTAMINATION Prior to use, all sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with a solution of Alconox. All probing rods will be cleaned prior to advancement at each probe boring location. Advanced GeoEnvironnnental, Inc.