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2.04.5(1) One sampling station is available at the present time in order • to sample the alluvial water quality or water quality from the bedrock sandstone. This station is the recently completed well, CE-81-1. Results of the sampling are on Figure 2.04.5-Sc. The Ewing Well analysis is shown as Figure 2.04.5-Sb. Atluifers would contain waters very similar to those found in the coal beds, except where they are near a better quality recharge source. Water quality in the alluvial glacial outwash material is of high quality and acceptable for potable and irrigation uses. One quality analysis was obtained from records of the U.S. Geological Survey and is shown on Figure 2.04.5-6. Figures 2.04.5-7, 2.04.5-8, 2.04.5-9, and 2.04.5-10 show additional monitoring and completiop data from the Hodges water well in the southwestern quarter Section 1. Due to the direct recharge by perennial snow melt and spring fed streams, this aquifer contains the best reliable groundwater in the area. Additional well completion data for the Tasater well in Section 11 is found as Figure 2.04.5-14a. DESCRIPTION AND PREDICTIVE INFORMATION-EFFECTS OF MINING ON GROUNDWATER. At the present time, quantitiative data concerning the hydrologic effects fo mining the "D" and "E"'coal seams on the surrounding area is scarce. Long term monitoring and pumping tests have not yet been conducted in the area in either the bedrock or alluvial aquifers. Monitoring data consisting of water level measurements during the last three years in holes CE-77-1 and CE-77-2, collected by the U.S. Geological Survey Water Resource Division in Grand Junction, Colorado, is included in Figures 2.03.5-11, 2.04.5-12, 2.04.5-13, and 2,04.5-14. Figure 2.04.5-15 contains the monitoring data collected by personnel of Grand Mesa Coal Company at site CE-80-4a in the "D", "E", and "F" coal seams. This data is the cpmplete record of hyrologic monitoring data in the area. •- REVISED May 8, 1981 46 ;::