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13 May 1999 <br /> AGE-NC Project No. 99-0557 <br /> Page 4 of 5 <br /> 3.0. 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 probe borings,soil sampling, ground water <br /> sampling, equipment decontamination and sample shipment are outlined below. <br /> 3.1. PROBE BORING ADVANCEMENT <br /> Probe borings will be advanced using a Geoprobe 5400 direct-push probing unit equipped with <br /> 1.25-inch probing rods. The Geoprobe advances soil probe borings using a hydraulic or pneumatic <br /> hammer to drive soil and ground water sampling tools to specified depths. <br /> 3.2. SOIL SAMPLING PROCEDURES <br /> Soil samples will be collected using Geoprobe push-driven 2-inch diameter discrete and/or <br /> continuous core samplers fitted with four six-inch long brass sleeves or a four-foot long Teflon <br /> sleeve,respectively.Upon removal from the sampler,the sample sleeve is separated with a clean soil <br /> knife. The exposed ends of the sleeve will be covered with Teflon sheets, capped and sealed with <br /> tape. Soils encountered in the borings will be visually classified by an AGE geologist in accordance <br /> with the Unified Soil Classification System (USCS). Additionally, soil samples with be field <br /> screened for the presence of volatile organic compounds using an OVM. <br /> Following sample collection, each preserved sample sleeve will be labeled with the boring location, <br /> depth,time, date and sampler's initials. Appropriately sealed and labeled samples will be placed in <br /> a chilled container under ice and transported under chain-of-custody procedure to a DHS-certified <br /> laboratory. <br /> 3.3. GROUND WATER SAMPLING PROCEDURES <br /> For the collection of"grab" ground water samples, soil probe borings will be advanced to the top <br /> of the ground water table as identified by collection of a saturated soil sample. The depth to ground <br /> water in the area is approximate 15 to 20 feet bsg. Once ground water has been encountered, a <br /> Geoprobe push-driven water sampling device will be advanced two to three feet into the water <br /> bearing zone. Grab ground water samples will be collected using a Geoprobe water sampling <br /> assembly fitted with a pre-cleaned one-inch 0.01 slotted temporary well screen. Each ground water <br /> sample will be extracted by lowering a Teflon bailer through the hollow center of the push rods into <br /> the screen section. Samples for BTEX, TPH-g, and fuel oxygenate analyses will be collected in <br /> Advanced GeoEnvironmental,Inc. <br />