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Monitoring Well Construction <br /> Following is a discussion of proposed drilling, soil sampling, <br /> monitoring well construction, monitoring well development, <br /> surveying, and ground water sampling activities for the subject site. <br /> Drillinvy Activities and Soil SamWlag <br /> The maximum depth of the three monitoring wells located outside of <br /> the warehouse will be 30 feet Because the warehouse floor is <br /> elevated approximately five feet above grade, the maximum depth of <br /> the monitoring well within the warehouse will be 35 feet. The <br /> monitoring wells will be drilled utilizing a truck-mounted drill rig <br /> equipped with continuous flight, hollow-stem augers. Prior to <br /> drilling each well boring, the augers will be cleaned and <br /> decontaminated by the use of steam. <br /> Soil samples will be collected during drilling utilizing a modified <br /> California split-spoon sampler equipped with pre-cleaned brass <br /> sampling tubes As outlined in the Tri-Regional Board Staff <br /> Recommendations for Preliminary Evaluation and Investigation of <br /> Underground Tank Sites (10 August 1990), for each well, soil samples <br /> will be collected every five feet within the unsaturated zone The <br /> sampler will be cleaned prior to each use in an Alconox® solution <br /> and rinsed with de-ionized water Soil samples retained in brass <br /> tubes will be secured by covering the ends of the tubes with Teflon® <br /> film and plastic caps. <br /> Soil samples will be labeled with a unique sample number, the <br /> project name and location, the date and time, and the sampler's <br /> initials Samples will then be placed in Zip-Lock® type plastic bags, <br /> sealed, and placed in an iced cooler Information noted on the label <br /> will be recorded on a chain-of-custody form After completion of <br /> drilling, the samples will be delivered under chain-of-custody to a <br /> California-certified laboratory <br /> Soil samples and drill cuttings will be visually inspected and <br /> classified according to the Unified Soil Classification System (USCS) <br /> by a qualified ERM-West geologist Boring logs will be constructed to <br /> record vertical variations in lithology, moisture content, color, <br /> texture, odor, and organic vapor concentration of the sail The <br /> organic vapor concentration will be recorded on the field drilling <br /> logs. <br /> 2-2 <br />