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conditions across the permit area resulting in an extremely complex <br />• ground water system. <br />i. Overburden-Dakota Coal <br />Monitor wells completed in the overburden, Dakota coal, and both <br />the overburden and the Dakota coal were used to construct the <br />overburden-Dakota coal water level-piezometric surface contour map <br />(Exhibit 2). <br />Ground water flow in the overburden-Dakota coal is from the <br />northeast of the mine towards the southwest. Ground water <br />recharge is mainly from the northeast. During the Sumner <br />months, irrigation water contributes significantly to the <br />recharge of the ground water system. Ground water discharge <br />occurs locally wherever the water table intercepts the ground <br />surface and the open mine pits as evident at the Highwall <br />Spring (see Section III.C.S.). <br />• As stated previously, monitor wells GW-N23, N24, and N25 <br />located in the scraper area are all dry. The overburden-Dakota <br />coal is unsaturated in this area. <br />Exhibit 2 lacks any contours in the reclaimed areas. Only one <br />monitor well has been constructed to monitor this zone, monitor <br />well GW-N10, which is dry. Three additional spoil monitor wells, <br />located as shown on Exhibit 1, will be constructed during the 1987 <br />field season in order to more accurately determine the saturated <br />thickness of the spoils aquifer. Information gathered from these <br />additional wells will be reported and discussed in the 1987 AHR. <br />Finally, only monitor well GW-N8 has shown any decline in water <br />level. The water level in monitor well GW-N8 had declined 13 <br />feet by mid-1983. Since the interruption of mining, the well <br />has slowly started to recover. <br /> <br />71 <br />