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6 feet bgs in each of the borings. Soil samples were retained for analytical <br /> testing at the following depths in the respective borings. <br /> • SB-4: 0.5, 3.0,and 3.5 feet bgs. <br /> • SB-5: 0.5, 1.0, and 4.0 feet bgs. <br /> SB-6: 0.5,1.0, and 3.5 feet bgs. <br /> SB-7: 0.5, 1.0, and 3.5 feet bgs. <br /> Additionally,three shallow borings (SS-1 through SS-3) were advanced <br /> tluough approximately 6 inches of asphalt to approximately 1.5 feet bgs <br /> using the GeoProbe®unit to collect surface soil samples near areas of <br /> heavy truck traffic. <br /> Each soil sample was described and logged in the field by an ERM <br /> geologist,under the supervision of a California Registered Geologist. <br /> CJI Non-disposable equipment(e.g., drilling and sampling equipment) <br /> utilized during the subsurface investigation was decontaminated prior to <br /> use at each location and at the completion of field activities. <br /> Decontamination was performed using diluted non-phosphate soap <br /> followed by distilled water rinse. Investigative wastes, including soil <br /> cuttings, decontamination water, and purge water,were contained on site <br /> in a labeled 55-gallon steel drum and are pending disposal. Each boring <br /> location was surveyed by a licensed California surveyor following <br /> installation. <br /> J3.2.2 Groundwater Characterization <br /> After completion of each boring, a temporary well point was constructed <br /> from a five-foot section of 1-inch-diameter polyvinyl chloride (PVC) <br /> casing with 0.01 inch slotted screen. Static water levels in the wells were <br /> Jmeasured on 12 January 2004, approximately 20 hours after installation to <br /> ldetermine the hydraulic gradient at the site. <br /> 'J The temporary wells did not yield enough water to be purged, and were <br /> sampled immediately after static water levels were measured. The <br /> sampling method utilized disposable,flexible, plastic tubing with a <br /> decontaminated, stainless-steel ball and check valve on the end. The <br /> plastic tubing was agitated up and down as the water entered the tubing, <br /> ' l and became trapped. Once the reconnaissance groundwater samples <br /> 'l rani 6 Ltsco/M4301a/3/2005 <br /> J <br /> �J <br />