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U <br /> 16 Evaluating the Groundwater Flow Direction and Gradient <br /> The elevations and positions of the monitoring well were surveyed by California-licensed land <br /> surveyors The elevations of the monitoring wells were surveyed to within 0 01 foot of the bench <br />' mark The lateral distances were measured to the nearest 0 1 foot The elevations references were <br /> either the notch or the arrow made on the top of 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 elevations were used to construct a total head <br />' elevation map (a k a water table or potentiometric surface) The map was used to estimate the <br /> groundwater gradients and directions of flow <br /> 1 <br /> 1 <br /> N IsacI)P12oo5Trj188018800391A Sab doc SHAW ENVIRONMENTAL, INC <br /> B-2 <br />