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Page ll <br /> ppb. . . Parts per billion <br /> N.D . . .Not detected <br /> SUMMARY OF OTHER ENVIRONMENTAL ACTIVITIES PERFORMED DURING <br /> THE PAST QUARTER <br /> Calculation of the Direction and Slope of Groundwater Flow <br /> The depths to groundwater measured in MW-1 , MW-2 , and MW-3 <br /> on December 2 , 1994 and previously determined wellhead <br /> elevations were used to develop groundwater contours by the <br /> interpolation method and calculate the direction and slope <br /> of groundwater flow. A graphic representation of these <br /> calculations is presented on the transparency overlaying <br /> the enclosed site map . <br /> Table 6 <br /> Wellhead Elevations , Depths of Groundwater , and Groundwater <br /> Elevations at 2360 East Street , Tracy <br /> December 2 , 1994 <br /> • Well Wellhead Depth to Groundwater <br /> Number Elevation Groundwater Elevation <br /> ------------------------------------------------------- <br /> MW-1 69 . 73 ft 7 24 ft 62 . 49 ft <br /> MW-2 69 . 68 ft 6 . 90 ft 62 . 78 ft <br /> MW-3 69 . 65 ft 6 . 48 ft 63 . 17 ft <br /> ------------------------------------------------------- <br /> ft . . . feet <br /> The hydraulic gradient (i ) may be expressed by the formula <br /> i = h/L <br /> where "h" represents the difference in the elevations <br /> of the two extreme groundwater contours <br /> and "L" represents the distance between these two <br /> extreme contours <br /> or , i = 63.00 ` - 62 . 60 ' - 0 . 40 ft = 0 .005517 ft/ft <br /> • 72 . 50 ' 72 . 50 ' <br />