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• Before collecting each groundwater sample, the geologist cleaned the Teflon bailer with a laboratory-grade detergent and rinsed it with tap water and deionized water Hydrochloric acid was added to the sample vials as a preservative A sample of the formation water was then collected from the surface of the water in each of the wells with the Teflon bailer and slowly transferred to laboratory-cleaned sample containers Sample Labeling and Handling Water samples were preserved in laboratory-cleaned, 40-milliliter glass vials that contained concentrated hydrochloric acid as a preservative The water samples were sealed with Teflon-lined lids to eliminate air bubbles The sample containers were labeled in the field with the site identification, monitoring well number and depth, and date, and promptly placed in iced storage for transport to the laboratory The geologist initiated chain-of-custody records in the field that accompanied the samples to a laboratory certified by the state of California for the analyses requested Samples were transported to the laboratory promptly Samples in our custody were properly disposed of after their useful life had expired Evaluating the Groundwater Flow Direction and Gradient . The elevations and positions ("x" and "y" lateral coordinates)of the monitoring well were surveyed by a licensed land surveyor The elevations of the monitoring wells were referenced to within 0 01 foot of the bench mark The horizontal distances were measured to the nearest 0 1 foot The elevations were taken to either the notch or the arrow on the well casing The groundwater elevations for each monitoring well were calculated by subtracting the depth to water from the wellhead elevation The groundwater elevation information was to construct a potentiometric surface map, which was used to evaluate the direction of groundwater flow and the magnitude of the groundwater gradient i SACK 1DMS1IBCIIBCSTOCK QM2-981mtt 1 Mon A-Z Rev 0,8/18/98