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• <br />MINING AND RECLA~4IATION PLAN October, 1979 <br />~~1T. GUNNISON NO. 1 MINE Revised tilarch, 19S1 <br />Revised August 28, 1981 <br />Revised January 25, 1982 <br />Revised February 5, 1982 <br />calculated to be 16.68 gpd/ft and 2.46 gpd/ft in the Barren Member. The <br />transmissivity, well yield, and pumping rate data from these tests are shown in <br />Table 2.8.2.A.1 and indicate that the sands in the Barren Member and the "F" coal <br />seam are poor aquifers. [n fact, one well (SOM C35) was completed into the "F" <br />coal seam and found to be dry. A pump test was conducted in the alluvial material <br />of the North Fork of the Gunnison River that yielded 17.5 gpm, and a pump test <br />was completed in the alluvial material of Sylvester Gulch which yielded only 0.5 <br />gpm. No mining will occur under Sylvester Gulch or the North Fork of the <br />Gunnison River. No mining will occur under any alluvial aquifer during the first <br />five years of mining. <br />In compliance with MLRB Stipulation No. 5 and OSM Stipulation No. 11, pumptests <br />were conducted on wells completed in the Barren Member and "F" seam of the five <br />year permit area. With the exception of those shallow wells near the mine adit <br />/~ that were affected by dewatering activities, the aquifers tested can be <br />~ `` characterized as poorly saturated with low permeability. The results of this <br />testing activity is presented in Table 2.8.2.A.2. All wells were completed in the <br />Barren Member with exception of D-27-2 which was completed in the "F" seam and <br />15 feet into the material beneath the "F" seam. <br />On September 30, 1981 an attempt was made to purnptest Well B-27-2. <br />Unfortunately, construction activity had destroyed the well. However, even if the <br />well had not been destroyed it would have been very difficult to test since it was <br />originally designed as a piezometer with a one inch inside diameter casing. This <br />meant that pumping, air lifting, and conventional bailing techniques would not have <br />been possible. <br />Well B-32 was also designed as a piezometer with a one inch diameter casing. No <br />attempt was made to test this well since its total depth is 48.9 feet and depth to <br />water was 48.5 feet (November 21, 1981) leaving 0.4 feet (4.8 inches) of water in <br />the well. <br /> <br />2-303a <br /> <br />