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Work Plan March 5, 1990 <br /> Proposed Unocal Station, Stockton, California AGS 30010-1W <br /> length of 2-inch-inner-diameter clean, steel pipe placed inside the hollow-stem auger. We <br /> will observe the driller drive the well point approximately 2 feet below the bottom of the <br /> boring or until the well point encounters refusal. <br /> Before sampling, approximately 5 gallons of ground water will be purged through the well <br /> point using a clean Teflon bailer until the water is free of suspended material. The <br /> recovered fluids in each boring will be put into 17E steel, 55-gallon liquid waste drums <br /> approved for this use by the Department of Transportation. <br /> After purging, we will collect each water sample by retrieving the bailer and slowly <br /> transferring the water to laboratory-cleaned, 40-milliliter vials or 1-liter glass bottles that <br /> contain hydrochloric acid as a preservative. The vials and bottles will be completely filled <br /> thereby eliminating headspace, labeled, and placed in iced storage for transport to the <br /> analytical laboratory. A Chain of Custody Record will be initiated in the field by the <br /> geologist and will accompany the samples to the laboratory. Copies of these records will <br /> be included in our report. <br /> On completion of ground-water sampling, the piping and well point will be removed from <br /> the boring and steam-cleaned. The borings will be backfilled using a bentonite-cement <br /> slurry to surface. <br /> 9 <br /> APp/ied GeoSystems <br />