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12 February 2001 <br /> AGE-NC Project No. 00-0806 <br /> Page 4 of 5 <br /> 4.1. PROBE BORING ADVANCEMENT <br /> The probe boring 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 probe borings using a hydraulic <br /> hammer to drive soil sampling tools to specified sampling depths. Soil cuttings are not generated by <br /> this method. <br /> 4.2. SOIL SAMPLING COLLECTION AND ANALYSIS <br /> The soil probe boring will be sampled at discreet five-foot intervals using a 1.125" Geoprobe soil <br /> sampling assembly loaded with four six-inch brass sleeves. Upon sample xetrieval, the ends of the <br /> second 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 the `grab' ground water sample,the probe boring will be advanced to a depth <br /> of four feet below the ground water surface. The grab ground water sample 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 screen. The groundwater sample will be extracted by lowering a Teflon <br /> bailer through the hollow center of the push rods into the screened section. The sample will be <br /> collected in laboratory-supplied, 40-m1 VOA vials containing 0.5 ml hydrochloric acid as sample <br /> preservative. The labeled vials will be placed in a chilled container under ice and transported under <br /> chain-of-custody to a DHS-certified 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 GeoEnvironmental,Inc. <br />