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� ey <br /> 12 March 1999 <br /> AGE-NC Project No. 98-0432 <br /> Page 5 of 6 <br /> will be included in the report. The report will be in a format acceptable to the PHS-EHD and the <br /> CVRWQCB, and will be reviewed and signed by a California Registered Geologist. <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 probe borings, soil sampling, ground water <br /> sampling, equipment decontamination and sample shipment are outlined below. <br /> 4.1. PROBE BORING ADVANCEMENT <br /> Probe borings will be advanced using AGE's 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 /> or pneumatic hammer to drive soil and ground water sampling tools to specified depths. <br /> 4.2. SOIL SAMPLING PROCEDURES <br /> Soil samples will be collected at five-foot intervals using a Geoprobe sampler and four brass sleeves. <br /> Upon sample retrieval, the brass sleeves will be removed from the sampler. The exposed ends of the <br /> second sleeve will be covered with Teflon sheets, capped and sealed with tape. 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 with be field screened for the presence of <br /> volatile organic compounds using an OVM. <br /> Following sample collection, each preserved sample sleeve will be labeled with the boring location, <br /> depth, time, date and sampler's initials. Appropriately sealed and labeled samples will be placed in <br /> a chilled container under ice and transported under chain-of-custody procedure to a DHS-certified <br /> laboratory. <br /> 4.3. GROUND WATER SAMPLING PROCEDURES <br /> For the collection of"grab" ground water samples, a selected probe borings may be advanced to the <br /> top of the ground water table as identified by collection of a saturated soil sample. Once ground <br /> water has been encountered, a Geoprobe push driven water sampling device will be advanced three <br /> to four feet into the water bearing zone. Grab ground water samples will be collected using a <br /> Geoprobe water sampling assembly or a pre-cleaned one-inch 0.01 slotted temporary well screen. <br />