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3.6 Monitoring Well Development <br /> ' The new monitoring wells were developed on July 7, 1995 using sterile, polyethylene bailers. <br /> Bailing removed turbid water from the wells until clear water appeared. The monitoring wells <br /> were sampled after a minimum of 40 gallons were bailed and the ground-water levels had <br /> recovered to at least 90% of their static levels. <br /> 4.0 GROUND-WATER MONITORING <br /> 4.1 Ground-Water Soundings <br /> Monitoring wells MW-4, MW-5, MW-6, MW-7, and MW-8 were sounded on July 7, 1995 <br /> utilizing a Keck" interface probe; the W.W. Irvin, Inc. staff geologist intercepted the <br /> piezometric surface at an average depth of 15.73 feet below the tops of the well casings. The <br /> average depth to the water table has increased 3.5 feet since January 10 when the average depth <br /> to the water table was 12.23 feet utilizing depths sounded in MW-4, MW-5, and MW-6. Table <br /> 2 lists clock times of soundings for six activities performed since September 19, 1994, with <br /> Stockton-corrected times and heights of highest & lowest tides. <br /> Using the three-point method, the calculated local ground-water flow direction on July 7, 1995 <br /> was approximately N77E along a gradient of 0.009 foot/foot. Between January 10 and July <br /> 7, the flow direction has shifted 36° to the north, but has remained easterly (see the Ground- <br /> Water Gradient Map, Figure 3). <br /> W.W. Irwin, Inc. <br /> Project No. 33016.65&.06 <br /> August 1995 9 <br />