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N <br />' 24 October 2001 <br /> AGE-NC Project No. 01-0877 <br /> Page 6 of 7 <br /> 4.1. PROBE BORING ADVANCEMENT <br /> Probe borings will be advanced using a van-mounted Geoprobe 5400 direct-push probing unit <br /> equipped with 1.125-inch probing rods.The Geoprobe advances soil probe borings using hydraulic <br /> pressure and a pneumatic hammer to drive soil sampling tools to specified depths. <br /> 4.2. SOIL SAMPLING COLLECTION AND ANALYSIS <br /> Soil borings will be sampled at discreet five-foot intervals using a 1.25" Geoprobe soil sampling <br /> assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of a selected <br /> soil-filled sleeve,generallythe second leading sleeve willbe coveredwith Teflon sheets,capped and <br /> sealed with tape. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain-of-eustodyto aDHS-certified laboratory.Each sample sleeve willbe labeled <br /> with the boring designation,depth,time,date and sampler's initials.Soils encountered inthe borings <br /> will be visually classified by an AGE geologist in accordance with the Unified Soil Classification <br /> System(USCS).Additionally,soil samples will be field screened for thepresence of volatile organic <br /> compounds using an organic vapor meter(OVM), equipped with photo-ionization detector(PID). <br /> 4.3. GRAB GROUND WATER SAMPLING AND ANALYSIS <br /> Forthe collection of`grab'groundwater samples,selected probe borings willbe advanced to a depth <br /> of four feet below the ground water surface. The grab ground water samples will be collected using <br /> a Geoprobe water sampling assembly with a wire-wound steel screen or a pre-cleaned one-inch <br /> diameter,0.01-inch slotted PVC screen.Each ground water sample will be extracted by lowering a <br /> Teflon bailer through the hollow center of the push rods into the screened section. Samples will be <br /> collected into laboratory-supplied,40-mi VOA vials containing 0.5 ml hydrochloric acid as sample <br /> preservative and into one-liter amber bottles without a preservative. The labeled containers will be <br /> placed in a chilled container under ice and transported under chain-of-custody to a DHS-certified <br /> laboratory. <br /> 4.4. EQUIPMENT DECONTAMINATION <br /> Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <br /> `advanced GeoEnvironnnental,Inc. <br />