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The groundwater purged from the wells was temporarily stored in 17E, steel, 55-gallon liquid waste <br />' drams approved for this use by the Department of Transportation <br /> Before collecting each groundwater sample, the geologist cleaned the Teflon`s bailer with a <br /> laboratory-grade detergent and rinsed it with tap water and deionized water Hydrochloric acid was <br /> added to the sample vials as a preservative A sample of the formation water was then collected <br /> from the surface of the water in each of the wells with the Teflon bailer and slowly transferred to <br /> 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 Teflon-lined <br /> ' lids to eliminate air bubbles The sample containers were labeled in the field with the site <br /> identification, monitoring well number and depth, and date, and promptly placed in iced storage for <br /> transport to the laboratory The geologist initiated chain-of-custody records in the field that <br /> accompanied the samples to a laboratory certified by the state of Califorma for the analyses <br /> requested Samples were transported to the laboratory promptly Samples in our custody were <br /> properly disposed of after their useful life had expired <br /> p Y <br /> Evaluating the Groundwater Flaw Direction and Gradient <br /> The elevations and positions ("x" and "y" lateral coordinates) of the monitoring well were surveyed <br /> by a licensed land surveyor The elevations of the monitoring wells were referenced to within <br /> ' 0 01 foot of the bench mark The horizontal distances were measured to the nearest 0 1 foot The <br /> 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 to <br /> water from the wellhead elevation The groundwater elevation information was to construct a <br /> potentiometric surface map, which was used to evaluate the direction of groundwater flow and the <br /> magnitude of the groundwater gradient <br /> 11SACRFPIICOMMON1sacDP12003\Prj188018800391A3aadoc Shaw Environmental, Inc <br /> (01050000) <br /> B-2 <br />