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17 February 2002 <br /> AGE-NC Project No. 01-0875 <br /> Page 5 of 6 <br /> 4.0. FIELD PROCEDURES <br /> All field 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 /> The 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 2.125" Geoprobe <br /> soil sampling assembly loaded with four six-inch brass sleeves. Upon sample retrieval,the ends of <br /> the 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 to a DHS-certified laboratory.Each sample sleeve will be labeled <br /> with the boring designation,depth,time,date and sampler's initials.Soils encountered in the borings <br /> will be visually classified by an AGE geologist in accordance with the Unified Soil Classification <br /> System(USCS).Additionally,soil samples will be field-screened for the presence of volatile organic <br /> compounds using an organic vapor meter(OVM), equipped with photo-ionization detector(PID). <br /> 4.1.2. Grab Ground Water Sampling Procedures <br /> For the collection of`grab' ground water samples,the probe borings will first be advanced to a depth <br /> of four feet below the ground water surface(approximately 30 or 35 feet bsg).The grab ground water <br /> samples will be collected using a Geoprobe water sampling assembly with a wire-wound steel screen <br /> or a pre-cleaned one-inch diameter, 0.01-inch slotted screen. Each ground water sample will be <br /> extracted by lowering a Teflon bailer through the hollow center of the push rods into the screened <br /> section. Samples will be collected in laboratory-supplied, 40-m1 VOA vials containing 0.5-m1 of <br /> hydrochloric acid as sample preservative,one-liter amber containers and 500-m1 plastic containers. <br /> The labeled vials will be placed in a chilled container under ice and transported under chain-of- <br /> custody to a DHS-certified laboratory. <br /> Advanced GeoEnvironmental,Inc. <br />