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known; further monitoring may help to explain it. <br /> 5. Well GW-N6 -- Underburden <br /> Water level measurements have been taken at this well on a <br /> monthly basis since September, 1979. The water level <br /> hydrograph for this well shows a maximum seasonal water level <br /> fluctuation of about 13.5 feet. The water levels generally <br /> peak between June and October and decline from November to May. <br /> Mining operation and precipitation events have had no <br /> discernable effects on the water levels. <br /> 6. Well GW-N8 -- Overburden and Dakota Coal <br /> Water level measurements have been taken at this well on a <br /> monthly basis since September, 1979. The well is located <br /> upgradient and adjacent to the active mine pit. Because of the <br /> well 's proximity to the pit, a decline in static water level of <br /> 13 feet has occurred. Since mining ceased in late 1983, the <br /> static water level has begun to recover. Fluctuations in water <br /> level as a result of recharge from irrigation water are also <br /> evident at this location. <br /> 7. Well GW-N9 -- Overburden and Dakota Coal <br /> Water level measurements have been taken at this well on a <br /> monthly basis since September, 1979. The water level <br /> hydrograph for this well shows a maximum seasonal fluctuation <br /> of about 18 feet. The water level generally peaks between May <br /> and September and then declines from October to April . This <br /> well is usually the first well to respond to recharge from the <br /> irrigation system. The hydrograph for this well does not <br /> reflect any evidence of mining effects nor are there any <br /> discernable responses to precipitation events. <br /> 8. Well GW-N10 -- Spoil <br /> Water level measurements have been taken at this well on a monthly <br /> basis since January, 1981. This well has been dry for the period <br /> of record. The water level report does indicate that approximately <br /> 75 <br />