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i <br /> i <br /> w <br /> November 1990 -G2- M88168D <br /> Drill holes Dpi-2, DH-3, and DH-4 were backfilled from total depth to .9 <br /> grade with a 5-foot thick bentonite plug, and a "two sack" cement/aggregate <br />{ ? <br />` slurry provided by Lodi Redi Mix of Lodi, California. <br /> SOIL SAMPLING <br /> i <br /> This assessment included procedures to collect undisturbed and --t <br /> .1 disturbed soil, samples from the subsurface for laboratory chemical analyses. <br /> Soil sampling procedures generally followed the SWRCR document entitled "Leaking <br /> Underground Fuel Tank Field Manual: Guidelines for Site Assessment, Cleanup, and <br /> Underground Storage Tank Closure" and revisions (April 5, 1989). The manual is <br /> I <br /> generally referred to as the LUFT Field Manual. <br /> A Modified California split-spoon sampler was employed to obtain <br /> undisturbed samples of the earth materials encountered. The split-spoon sampler <br /> consists of a 3-inch-diameter, 12-inch-long, steel sampler which contains four, <br /> 3-inch-long, 2.5-inch-diameter, stainless steel sampling sleeves. When the , <br /> desired depth for sampling was achieved, the auger bit was removed and the <br /> sampler driven 12 inchr;s ahead of the auger flights in undisturbed subsurface <br /> soils. After the sampier. was removed from the subsurface, one of the sampling <br /> sleeves was removed from the sampler, the ends of the Gleeve sealed with Teflon <br /> sheets and air-tight plastic caps, taped, and placed in a cooler artificially <br /> cooled for preservation. The remaining three sleeves were emptied, with the <br /> r _ <br /> 5 ` `.'; contents of one being used for logging information and the other monitored for <br /> f i <br /> volatile organics with the PID as described below. All samples were then hand <br /> r <br /> delivered to the laboratory-. The samples were labeled upon collection and chain- <br /> of-custody sample — <br /> 4. of-custod and pe preservation documentarian accompanied the sar'ples from <br /> collection to delivery to the laboratory, Coast to Coast Analytical Services <br /> (CCAS). <br /> f� After the sample was obtained, additional soil was collected from the <br /> sampler and monitored for organic vapors using a PID. A stainless steel sample i <br /> sleeve with plastic end caps was filled approximately one-third full with soil <br /> from the sampler and shaken with_the end cap_._covered_to._liberate-soil.-vapors-into------ <br /> the <br /> into-----the void space. The soil .vapor was then measured for volatile hydrocarbon <br /> , 3r compounds by inserting the PID probe .into a hole in the end cap. The sample <br /> s, <br /> akf <br /> yt d <br /> N <br /> r <br />