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09 March 2005 <br /> AGE-NC Project No. 05-1263 <br /> Page 4 of 4 <br /> 4.2. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Soil borings will be sampled at discrete five-foot intervals using a 1.5" 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. EQUIPMENT DECONTAMINATION <br /> Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <br /> 4.4. BORING ABANDONMENT <br /> All probe borings will be permanently sealed to prevent vertical migration of potential contaminants. <br /> Soil borings shall be abandoned by backfilling with portland cement from the total depth to surface <br /> grade. <br /> 5.0 REFERENCES <br /> California Division of Mines and Geology, 1981. Regional Geologic Map Series, Sacramento <br /> Quadrangle. <br /> Olmsted, F.H., and G.H. Davis, 1961, Geologic Features and Groundwater Storage Capacity of <br /> 1he Sacramento Valley, California, U.S. Geological Survey Water Supply Paper 1497, <br /> 241 p. <br /> Advanced GeoEnvironmental,Inc. <br />