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I <br /> 10 Before collecting each groundwater sample, the geologist cleaned the Teflono bailer with alaboratory-grade <br /> detergent and rinsed it with tap water and delonized water Hydrochloric acid was added to the sample vials <br /> as a preservative A sample of the formation water was then collected from the surface of the water in each <br /> of the wells with the Teflon bailer and slowly transferred to laboratory-cleaned sample containers <br /> Sample Labeling and Handling <br />' Water samples were preserved in laboratory-cleaned, 40-milliliter glass vials that contained concentrated <br /> hydrochloric acid as a preservative The water samples were sealed with Teflon-lined lids to eliminate air <br /> bubbles The sample containers were labeled in the field with the site identification, monitoring well number <br /> and depth, and date, and promptly placed in iced storage for transport to the laboratory The geologist <br /> initiated cham-of-custody records in the field that accompanied the samples to a laboratory certified by the <br /> state of California for the analyses requested Samples were transported to the laboratory promptly Samples <br /> in our custody were properly disposed of after their useful life had expired <br /> Evaluating the Groundwater Flow Direction and Gradient <br /> The elevations and positions ("x" and "y" lateral coordinates) of the monitoring well were surveyed by a <br /> licensed land surveyor The elevations of the monitoring wells were referenced to within 0 01 foot of the <br /> bench mark The horizontal distances were measured to the nearest 0 1 foot The elevations were taken to <br /> either the notch or the arrow on the well casing <br /> The groundwater elevations for each monitoring well were calculated by subtracting the depth to water from <br /> the wellhead elevation The groundwater elevation information was to construct a potentiometric surface <br /> map, which was used to evaluate the direction of groundwater flow and the magnitude of the groundwater <br />' gradient <br /> SAC111SACRFPIICOMMON1sacDP120021PREP)818801880039IA tae doc-Mit 1 <br /> (01010000) <br /> B-2 <br />