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02 June 2006 <br /> AGE-NC Project No. 06-1433 <br /> Page 4 of 5 <br /> performed and results of the sampling and analysis.Conclusions,applicable recommendations,and <br /> maps will be included in the report. <br /> 5.0. 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, equipment <br /> decontamination and sample shipment are outlined below. <br /> 5.1. 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 /> 5.2. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> At a minimum,soil borings will be sampled at discreet five-foot intervals using a 1.5-inch 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 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 professional 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 /> 5.3. GRAB GROUND WATER SAMPLE COLLECTION <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 approximately 20 feet bsg.Once ground water has been encountered,a Geoprobe <br /> push-driven water sampling device will be advanced two to three feet into the water bearing zone. <br /> Advanced GeoEnvironmental,Inc. <br />