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Y- w <br /> 22 May 2007 <br /> AGE-NC Project No. 97-0360 <br /> Page 4 of 6 <br /> performed and results of the sampling and analysis. Conclusions,applicable recommendations, and <br /> maps will be included in the report. <br /> 3.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of a California <br /> Professional Geologist. Procedures for the advancement of borings, soil sampling, ground water <br /> sampling, vapor sampling, equipment decontamination and sample shipment are outlined below. <br /> 3.1. 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 /> 3.1.1. Soil Sampling Procedures <br /> Soil borings will be sampled at discrete five-foot intervals using a 1.5 inch Geoprobe soil sampling <br /> assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of the second or <br /> other selected 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 /> 3.1.2. 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 0.010-slotted temporary well screen. <br /> Advanced GeoEnvironmental,Inc. <br />