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hollow stem augers was used to drill the borings Soil samples were collected at <br /> 5-foot intervals by advancing the augers to a point immediately above the desired <br /> sampling depth, starting at the 5-foot depth All drilling equipment was <br /> decontaminated by steam cleaning before and after drilling each borehole to <br /> prevent cross-contamination between boreholes <br /> Soil samples were obtained using a 2-inch diameter by 18-inch long stainless steel <br /> California Modified Split Spoon sampler The split spoons were fitted with three <br /> (3) 2-inch outside diameter by 6-inch long brass sample sleeves (tubes) for sample <br /> collection The split spoon sampler and unretained sample tubes were <br /> decontaminated after each sample retrieval to prevent cross contamination between <br /> samples using the following procedure <br /> • Solids were removed with a brush and washed in an Alconox and water <br /> solution <br /> • Rinsing with tap water <br /> • Rinsing with distilled water <br /> The bottom sample tube was retained, the ends of the tube covered with Teflon <br /> material and plastic caps, labeled, double-bagged in plastic bags, placed on ice in <br /> a portable cooler and entered into a chain of custody form The soil samples were <br /> collected and logged under the direction of a California Registered Geologist Soil <br /> descriptions were in accordance with the Unified Soil Classification System <br /> (USCS) as outlined in American Society of Testing Materials (ASTM) D2487 <br /> Logs of the borings are provided in Appendix VIII <br /> All collected soil samples were delivered in a chilled condition, with proper Chain <br /> of Custody documentation to Curtis & Tompkins in Berkeley, at the end of the job <br /> Curtis & Tompkins is a California Department of Health Services (DHS)-certified <br /> environmental laboratory (DHS ELAP Certificate No 1459) <br /> Soil cuttings generated from drilling and decontamination water generated from <br /> steam-cleaning drill augers and sampling equipment were stored in DOT-approved <br /> 55-gallon steel drums, sealed, labeled and placed in a securable roll-off container <br /> for temporary storage on-site pending disposition based on the results of the <br /> laboratory analysis <br /> I <br /> CRC Environmental Rusk Management inc Pro)ect#3620-001-4 <br /> George Bravante Receiver 2233 Grand Canal Boulevard <br /> January 19 1995 9 Stockton California <br />