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22 August 2000 <br /> AGE-NC Project No. 00-0746 <br /> Page 4 of 5 <br /> maps will be included in the report. The report will be in a format acceptable to the PHS-EHD and <br /> the 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 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 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 /> 4.2. SOIL SAMPLING COLLECTION AND ANALYSIS <br /> Soil borings will be sampled at discreet five-foot intervals using a 1.125" Geoprobe soil sampling <br /> assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of the second <br /> 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 /> 4.3. GRAB GROUND WATER SAMPLING PROCEDURES <br /> For the collection of`grab' ground water samples,selected probe borings will be advanced to a depth <br /> of four feet below the ground water surface. The grab ground water samples will be collected using <br /> a Geoprobe water sampling assembly with a wire-wound steel screen or a pre-cleaned one-inch <br /> diameter, 0.01 slotted screen. Each ground water sample will be extracted by lowering a Teflon <br /> bailer through the hollow center of the push rods into the screened section. Samples will be collected <br /> Advanced GeoEnvironmental,Inc. <br />