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06 August 2003 <br /> AGE-NC Project No. 03-1045 <br /> Page 5 of 6 <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 /> 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 depths. <br /> 4.1.1. Soil Sample Collection and Analysis <br /> The soil boring will be sampled at discreet five-foot intervals using a 1.5-inch 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 /> Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain-of-custodyprocedure 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 /> 4.1.2. In-situ Ground Water Sampling Procedures <br /> For the collection of grab ground water samples, soil probe borings will be advanced to the top of <br /> the ground water table as identified by collection of a saturated soil sample. Once ground water has <br /> been encountered,a Geoprobe push-driven water sampling device will be advanced two to three feet <br /> into the water-bearing zone. Grab ground water samples will be collected using a Geoprobe water <br /> sampling assembly fitted with a pre-cleaned,one-inch diameter 0.01-slotted temporary well screen. <br /> Each ground water sample will be extracted by lowering a polyethylene bailer through the hollow <br /> center of the push rods into the screen section. Samples for TPH-g,TPH-d, BTEX, fuel oxygenate <br /> and lead analyses will be collected into laboratory-supplied,40-m1 volatile organic analysis(VOA) <br /> vials containing 0.5-m1 of hydrochloric acid as sample preservative and 1-liter amber bottles. <br /> Advanced GeoEnvironmental,Inc. <br />