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15 June 1999 <br /> AGE-NC Project No. 98-0534 <br /> Page 8 of 13 <br /> and cross-sections will be included in the report. The report will be in a format acceptable to the <br /> PHS-EHD and the CVRWQCB, and will be reviewed and signed by a California Registered <br /> 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, monitoring well completion, equipment decontamination and sample shipment are <br /> 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 /> 4.1.1. Soil Sampling Collection and Analysis <br /> Soil borings to be sampled at discreet five-foot intervals will be sampled using a 1.125" 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 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 /> 4.1.2. 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 (approximately 19 feet bsg). The grab ground water <br /> samples will be collected using a Geoprobe water sampling assembly with a wire-wound steel screen <br /> Adenneed CeoEnvironmenlsl,Inc. <br />