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5 <br /> ! s <br /> Harding Lawson Associates <br /> aped. This map confirms earlier findings that the <br /> - g primary direc- <br /> tion of flow is north-northeast, with an average 4 gradient of <br /> 0.004 feet per foot. The depth to second ground water has not <br /> I.« <br /> r yet been determined. <br /> Mi Published hydraulic conductivity values (Todd, 1976) I <br /> for the types shallow subsurface materials Sound on the site are <br /> approximately 1 r. 10'8 feet pp <br /> a per second. This zone appears to be <br /> r- confined or semi-confined, as evidenced by the site stratigraphy <br /> and the elevation of the <br /> potentiometric surface. The. potentia-- <br /> r metric surface is also subject to seasonal fluctuations, as noted <br /> in Table I and on the site hydrograph (Plate <br /> .„ <br /> Li <br /> f � <br /> r~ <br /> r. p <br /> 4 <br /> J f <br /> , <br /> i ~Y <br /> r i.'y <br />