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03 December 2007 <br /> AGE-NC Project No. 00-0696 <br /> Page 4 of 6 <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 /> 3.2. SOIL SAMPLE COLLECTION <br /> Soil samples will be collected at discreet five-foot intervals using a 1.125-inch Geoprobe soil <br /> sampling assembly loaded with four six-inch stainless steel sleeves.Upon sample retrieval,the ends <br /> of 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 CDPH-certified laboratory. Each sample sleeve <br /> will be labeled with the boring designation,depth,time,date and sampler's initials.Soils encountered <br /> in 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 /> 3.3. GRAB GROUND WATER SAMPLE COLLECTION <br /> For the collection of grab ground water samples,the soil probe boring will be advanced to the top <br /> of the ground water table as identified by collection of a saturated soil sample or ten to twelve feet <br /> bsg. Once ground water has been encountered,a Geoprobe push driven water sampling device will <br /> be advanced two to three feet into the water-bearing zone. Grab ground water samples will be <br /> collected using a Geoprobe water sampling assembly fitted with a pre-cleaned, one-inch diameter <br /> 0.01-slotted temporary well screen. The ground water sample will be extracted by lowering a <br /> polyethylene bailer through the hollow center of the push rods into the screen section. <br /> Appropriately sealed and labeled grab ground water samples will be placed in a chilled container <br /> under ice and transported under chain-of-custody procedures to a CDPH-certified laboratory.Each <br /> sample container will be labeled with the boring designation,time, date and sampler's initials. <br /> 3.4. SOIL-VAPOR PROBE BORING ADVANCEMENT AND SAMPLING <br /> Each soil-vapor probe boring will be advanced to a maximum depth of four feet bsg using a <br /> Advanced GeoEnvironn,ental,Inc. <br />