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-19- Ground water occurs within laterally discontinuous aquifers of the Vermejo Formation: the sandstone aquifer immediately below the Brookside seam and voids in the coal seam. These aquifers, lenticular sandstones and voids created by previous mining, have been folded into the Chandler Syncline. This syncline, a north-south trending subsurface valley within the permit and adjacent area (See Figure 2), controls ground water flow directions. However, minor undulations of the strata within the syncline can cause the water to become perched forming secondary saturated lens or pools. Consequently, there can be more than one piezometric surface as is evidenced in vicinity of the proposed Twin Pines No. 2 Mine. One of the Uermejo aquifers is utilized within the adjacent area, the abandoned Caldirola No. 2 Mine. The town of Coal Creek uses the abandoned mine as a source of ground water for emergency water uses. The abandoned Caldirola Mine is located southeast of the proposed permit area on the eastern flank of the Chandler Syncline (see Figure 2). In 1974, United Western Engineers prepared an engineering report on Coal Creek's water supply system. In this report, on .p ages 11 and 12, the Caldirola No. 2 Mine was described as partially flooded with two main pockets of water, one near the air shaft and one near the westerly end of the slope (see Figure 5). Recently Coa] Creek joined the Florence City water system and the power supply to the well pump was removed. However, the right to emergency water still remains. In order to explain possible impacts to the ground water which supplies the Caldirola Mine well water right, it is necessary to describe in some detail the existing hydrologic regime in the adjacent area and the Division's hydrologic interpretations. The existing hydrologic regime in the abandoned Caldirola Mine is characterized by two piezometric surfaces (See Figure 5): 1) The piezometric surface of the perched aquifer in the upper pool; and 2) The piezometric surface of the lower pool. Other abandoned workings in the adjacent area and the sandstone below the Brookside seam exhibit the same water level as in lower portion of the Caldirola Mine. The separation of the two water reservoirs appears to be caused by a roll in the coal and the surrounding strata. The source of water for the upper pool of water in the abandoned Caldirola No. 2 Mine is probably permeable strata intersected along the rock slope into the mine, possibly a fault or a sandstone unit connected hydrologically with the nearby stream of Coal Creek. The source of water for the pool in the lower portion of the mine is probably a lenticular sandstone, 5 feet below the Brookside coal seam. Four facts submitted to the Division by Twin Pines on December 12, 1983 substantiate that there are two pools of water in the abandoned Caldirola Mine with two corresponding sources of water: 1) Personal communication with miners who worked in the Caldirola confines that there was a spring in the rock slope wall near the upper poor; 2) In 1919 or 1980, members of the Coal Creek town council entered the mine and reported that there were two pools of water;