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30 June 3002 <br /> AGE-NC Project No. 01-0827 <br /> Page 5 of 6 <br /> =4.0. FIELD PROCEDURES <br /> All geld procedures will be overseen by an AGE geologist or representative under the supervision <br /> of a California Registered Geologist. Procedures for the advancement of borings. soil sampling, <br /> ground water 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 1.25-inch probing rods. The Geoprobe advances soil probe borings using a hydraulic <br /> hammer to drive soil sampling tools to specified depths. <br /> 4.1 .1 Soil Sampling Collection and Analysis <br /> Soil borings to be sampled at discreet five-foot intervals will be sampled using a L2 5" Geoprobe soil <br /> sampling assembly loaded with four six-inch brass sleeves. upon sample retrieval, the ends of the <br /> second sleeve will be covered with Teflon sheets, capped and sealed with tape. <br /> Each sample sleeve will be labeled with the boring designation,depth,time,date and sampler's initials. <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. <br /> Soils encountered in the borings will be visually classified by an AGE geologist in accordance with <br /> the Unified soil Classification System(USCS). Additionally, soil samples will be field screened for <br /> the presence of volatile organic compounds using an organic vapor meter (OVM), equipped with <br /> photo-ionization detector (PID). <br /> 4.1 1 Grab Ground Water Sampling Procedures <br /> For the collection of-grab' ground water samples, selected probe borings will first be advanced to <br /> a depth of four feet below the ground water surface (approximately 215 or 30 feet bsg). The grab <br /> ground water samples will be collected using a Geoprobe water sampling assembly with a wire- <br /> wound steel screen or a pre-cleaned one-inch diameter, 0.01 slotted 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 screened section. Samples will be collected in laboratory-supplied, 40-m1 VOA vials containing <br /> Ci.5-ml of hydrochloric acid as sample preservative, 1 -liter amber containers and 500-m1 plastic <br /> containers. The containers will be properly labeled, placed in a chilled container under ice and <br /> transported under chain-of-custody to a DHS-certified laboratory. <br /> .Advanced C-eoF.nvi"mienml,Inc <br />