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Sample Labeling and Handling <br /> Water samples were preserved in laboratory-cleaned, 40-milliliter glass vials that contained <br /> concentrated hydrochloric acid as a preservative The water samples were sealed with <br /> Teflon-lined lids to eliminate air bubbles The sample containers were labeled in the field with <br /> the site identification, monitoring well number and depth, and date, and promptly placed in iced <br /> storage for transport to the laboratory The geologist initiated chain-of-custody records in the <br /> field that accompanied the samples to a laboratory certified by the state of California for the <br /> analyses requested Samples were transported to the laboratory promptly Samples in our <br /> 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 <br /> surveyed by a licensed land surveyor The elevations of the monitoring wells were referenced <br /> to within 0 01 foot of the bench mark The horizontal distances were measured to the nearest <br /> 0 1 foot The elevations were taken to either the notch or the arrow on the well casing <br /> The groundwater elevations for each monitoring well were calculated by subtracting the depth <br /> to water from the wellhead elevation The groundwater elevation information was to construct <br /> a potentiometnc surface map, which was used to evaluate the direction of groundwater flow <br />• and the magnitude of the groundwater gradient <br />• <br /> SAC\N\P72\260526051010 1 DS-97�cjb I A-2 Rev 0 10/30/97 <br />