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Work Plan March 5, 1990 <br /> Proposed Unocal Station, Stockton, California AGS 30010-1W <br /> possibility of downhole or crosshole contamination. The drilling will be performed under <br /> the guidance of a field geologist, and the earth materials will be logged as drilled by the <br /> Unified Soil Classification System. <br /> Collecting Soil Samples <br /> During drilling, soil samples will be collected at 5-foot or other appropriate intervals using <br /> a California-modified, split-spoon sampler equipped with clean brass sleeves. Samples will <br /> be collected by drilling the boring to a point just above the sampling depth and then driving <br /> the sampler into the soil through the hollow center of the auger. The sampler will be <br /> driven 18 inches with a standard 140-pound hammer dropped 30 inches. The number of <br /> blows required to drive the sampler each successive 6-inch interval will be counted and <br /> recorded on the field boring log to give an indication of soil consistency. Soil samples will <br /> be collected, identified, and evaluated for relative levels of contamination using a <br /> photoionization device (PID) when appropriate. Examples of the Field Boring Log, the <br /> Unified Soil Classification System, and Log of Boring are included in the appendix to this <br /> work plan. <br /> Soil samples collected for possible chemical analysis will be promptly sealed with aluminum <br /> foil, plastic caps, and tape. They will then be labeled and placed in iced storage for <br /> transport to the analytical laboratory. A Chain of Custody Record will be initiated by the <br /> 7 <br /> Applied GeoSystems <br />