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Page 5 <br /> SUMMARY OF OTHER ENVIRONMENTAL COMPLIANCE ACTIVITIES <br /> PERFORMED DURING 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 March 31 , 1995 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 2 <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 /> Dumber Elevation Groundwater Elevation <br /> • -------------------------------------------------------- <br /> MW-1 69 73 ft 7 . 02 ft 62 71 ft <br /> MW-2 69 . 68 ft 6 68 ft 63 . 00 ft <br /> MW-3 69 65 ft 6 . 24 ft 63 . 41 ft <br /> ------------------------------------------------------- <br /> ft feet <br /> The hydraulic gradient (1 ) may be expressed by the formula <br /> 1 = 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 , or : <br /> I = h/L = 63 40 ' - 62 . 71 ' = 0 . 69 ft = 0 . 006571 ft/ft <br /> 105 ' 105 ft <br /> • <br />