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corner of the site that was designated as having an <br /> + elevation of 60 00 feet . <br /> Table 2 <br /> Well Head Elevations and Depth to Groundwater at 275 Grant <br /> Line Road, Tracy, CA, February 14, 1994 <br /> Well Head Depth to Relative Groundwater <br /> Well Elevation* Groundwater Elevations <br /> Number ( ft) ( ft) ( ft) <br /> ----------------------------------------------------------- <br /> MW-1 60 . 51 7 . 77 52 . 74 <br /> MW-2 59 . 40 6 80 52 . 60 <br /> MW-3 60 . 05 7 36 52 . 69 <br /> *Well head elevations were determined with respect to an <br /> arbitrary datum established at the edge of a concrete <br /> footing for a light standard located at the southeast <br /> corner of the site that was designated as having an <br /> 10 elevation of 60 00 feet . <br /> r <br /> By employing the well head elevations and depths to water <br /> in monitoring wells MW-1, MW-2 , and MW-3 , groundwater <br /> elevations were calculated. Groundwater contours were <br /> drawn by interpolation of the groundwater elevations . As <br /> shown on Figure 3 of this report , on February 14, 1994, <br /> groundwater flow was towards the northeast at N--680 -E <br /> Hydraulic gradient was calculated by drawing a perpen- <br /> dicular line to contours established as described and then <br /> determining the distance on this line between extreme <br /> contours . Hydraulic head (h) between extreme contours was <br /> 52 71 ft less 52 . 63 ft or 0 08 feet Hydraulic gradient is <br /> equal to h/L or 0 08/37 5 ' = 0 .002 ft/ft (the hydraulic <br /> gradient on November 23 , 1993 was 0 00173 ft/ft) <br />