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• then collected from the surface of the water in each of the wells with the Teflon bailer and <br /> 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 <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 <br /> with the site identification, monitoring well number and depth, and date, and promptly <br /> placed in iced storage for transport to the Iaboratory The geologist initiated <br /> chain-of-custody records in the field that accompanied the samples to a laboratory certified <br /> by the state of California for the analyses requested Samples were transported to the <br /> laboratory promptly Samples in our custody were properly disposed of after their useful <br /> 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 <br /> referenced to within 0 01 foot of the bench mark The horizontal distances were measured to <br /> the nearest 0 1 foot The elevations were taken to either the notch or the arrow on the well <br /> casing <br /> The groundwater elevations for each monitoring well were calculated by subtracting the <br /> depth to water from the wellhead elevation The groundwater elevation information was to <br /> construct a potentiometnc surface map, which was used to evaluate the direction of <br /> groundwater flow and the magnitude of the groundwater gradient <br /> CP\D IQMR1RODGERSI3RDQ981RDGRQ398 DOC-98Usg i B-2 Rev 0, 11/17/98 <br />