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18 August 2000 <br /> AGE-NC Project No . 00 - 0753 <br /> Page 4 of 5 <br /> 4 . 0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of a California <br /> Registered Geologist. Procedures for the advancement of borings, soil sampling; ground water <br /> sampling, equipment decontamination and sample shipment are outlined below. <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 .254nch 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 COLLECTION AND ANALYSIS <br /> Soil borings 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 GROUNDWATER SAMPLING PROCEDURES <br /> For the collection of ` grab ' ground water samples, selected probe borings will be 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 slotted screen. Each ground water sample will be extracted by lowering a Teflon <br /> bailer through the hollow center of the push rods into the screened section. Samples will be collected <br /> in laboratory-supplied, 40-m1 VOA vials containing 0 . 5 ml hydrochloric acid as sample preservative <br /> and 14iter amber bottles . The labeled vials will be placed in a chilled container under ice and <br /> transported under chain-of-custody to a DHS -certified laboratory. <br /> Advanced GeoEnvironmental, Inc. <br />