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au <br /> June 26, 1992 <br /> . ARCO Service Station No. 549, Stockton, California ' <br /> The fluids generated during sample purging were directed into type 17E, steel, 55-gallon, <br /> liquid waste drums approved for this use by the Department of Transportation. The drums <br /> were labeled and temporarily stored onsite pending disposal. <br /> Sample Labeling and Handling <br /> Sample containers were labeled in 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 was initiated by the geologist and updated throughout handling of the <br />. samples and accompanies the samples to a laboratory certified by the State of California for <br /> the analyses requested. Samples were transported to the laboratory promptly to help ensure <br /> that recommended sample holding times were not exceeded. Samples in our custody were <br /> properly disposed of after their useful life had expired. <br /> Gradient and Direction of Ground-Water Flow <br /> A licensed land surveyor produced a site map showing the location of the monitoring 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 were referenced to within 0.01-foot <br /> of a nearby United States Geodetic Survey, County, or City bench mark. The horizontal <br /> ` distances were measured to the nearest 0.1-foot. The ground-water elevation in each <br /> monitoring well was calculated by subtracting the depth to water from the wellhead <br /> elevation. The ground-water elevation information was used to evaluate the direction of <br /> groundwater flow, evaluate the groundwater gradient, and construct a ground-water <br /> gradient or potentiometric map. <br /> 3=4-4 <br /> a <br />