Laserfiche WebLink
known; further monitoring may help to explain it. <br />• <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 />