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15 February 2005 <br /> AGE-NC Project No. 02-0950 <br /> Page 6 of 7 <br /> 4.2. CPT GROUND WATER SAMPLING <br /> A second,or paired,soil boring will be located adjacent to the first CPT boring(Figure 2)for ground <br /> water sample collection. Based on CPT findings, discrete grab ground water samples will be <br /> collected in significant intervals of porous and permeable strata.A HydroPunch sample tool will be <br /> pushed into the specified zone,then withdrawn approximately three feet to expose an inlet screen. <br /> The interior of the sampling tool fills with water and a I-inch outer diameter(O.D.) stainless steel. <br /> bailer will be lowered and utilized to extract a ground water sample.Grab ground water samples will <br /> be collected in selected intervals of porous and permeable material. <br /> Grab ground water samples will be collected into laboratory-supplied 40-milliliter (ml) volatile <br /> organic analysis (VOA) vials containing 0.5 ml of.hydrochloric.acid as preservative and one-liter <br /> amber glass containers without sample preservative. Care will betaken to-ensure that visible air <br /> bubbles are not present in the vials after filling and capping. Following sample collection, the <br /> samples will be appropriately labeled with the boring designation,time,date and sampler's initials, <br /> placed on ice, and transported under chain of custody to a DHS-certified laboratory. <br /> 4.3. SOIL BORING ADVANCEMENT <br /> Soil borings will be advanced using a van-mounted Geoprobe 5400 direct-push probing unit <br /> equipped with 1.25-inch probing rods. The Geoprobe advances soil borings using a hydraulic or <br /> pneumatic hammer to drive soil and ground water sampling tools to specified depths. <br /> 4.4. SOIL SAMPLING PROCEDURES <br /> Soil borings will be sampled at discrete 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 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 a photo-ionization <br /> detector (PID: Thermo Environmental 580, 10.0 eV, calibrated to isobutylene) <br /> Advanced GeoEnvironmental,Inc. <br />