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June 30, 1992 ���� <br /> Unocal Station No. 6981, Stockton, Califorrua <br /> The fluids generated during sample purging are directed into type 17E, steel, 55-gallon, <br /> liquid waste drums approved for this use by the Department of Transportation. The drums <br /> are labeled and temporarily stored onsite pending disposal. <br /> Sam le Labeling and Handling <br /> Sample containers are labeled to the field with the job number, sample location and depth, <br /> and date and promptly placed in iced storage for transport to the laboratory A Chain of <br /> Custody Record is initiated by the geologist and updated throughout handling of the samples <br /> and accompanies the samples to a laboratory certified by the State of California for the <br /> analyses requested Samples are transported to the laboratory promptly to help ensure that <br /> recommended sample holding times will not be exceeded Samples in our custody will be <br /> properly disposed of after their useful life has expired. <br /> Gradient and Direction of Ground-Water Flow <br /> A licensed land surveyor produces a site map showing the location of the morutoring wells <br /> and other site features with listing of the horizontal and vertical references of the <br /> monitoring wells The elevation of the monitoring wells are referenced to within 0 01-foot <br /> of a nearby United States Geodetic Survey, County, or City bench mark The horizontal <br /> distances are measured to the nearest 0 Hoot The ground-water elevation in each <br /> monitoring well is calculated by subtracting the depth to water from the wellhead elevation <br /> The ground-water elevation information is used to evaluate the direction of ground-water <br /> flow, evaluate the ground-water gradient, and construct a ground-water gradient or <br /> potentiometrnc map <br /> o3osPsii <br /> 0 38032-7 <br />