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• 3) COMMITMENT TO FILTER ALL GROUND WATER SAMPLES DESTINED FOR FULL OR <br />PARTIAL CHEMICAL ANALYSIS THAT MAY OTHERWISE SHOW SIGNIFICANT <br />DIFFERENCES BETWEEN THE DISSOLVED AND TOTAL VALUES OF THE CHEMICAL <br />CONSTITUENTS OF THE WATER AS A RESULT OF THE PRESENCE OF SUSPENDED <br />MATERIAL. SUCH SAMPLES WILL BE FILTERED THRU A 0.45 MICRON MEMBRANE <br />FILTER PRIOR TO PRESERVATION OF THE SAMPLE, AND ONLY THE FILTRATE <br />WILL BE CHEMICALLY ANALYZED. GROUND WATER SAMPLES INTENDED TO BE <br />ANALYZED FOR BIOCHEMICAL OXYGEN EMAND OR R BA ER A N , <br />THE PLAN WILL BE PROVIDED IN SUCH FORM THAT IT CAN BE INCORPORATED INTO THE <br />PERMIT APPLICATION AS AN EXHIBIT. APPROPRIATE REVISIONS IN RELATED TEXT, <br />TABLES, FIGURES, AND MAPS OF THE PERMIT APPLICATION WILL BE MADE, DATED COPIES <br />OF THIS REVISED MATERIAL WILL ALSO BE PROYIDED FOR INSERTION INTO THE COPIES <br />OF THE PERMIT APPLICATION ON FILE WITH THE DIVISION. <br />Surface Water <br />Monitoring stations are shown on Map 11 of the permit application. The <br />monitoring plan is described in Exhibit 29 and Table 3. The Division finds <br />this plan sufficient to monitor the mine's impacts to the surface water system. <br />F. Cumulative Hydrologic Impacts Study <br />Ground Water <br />• The underground Eagle No. 5 and No. 6 Mines together with the adjacent surface <br />Trapper Mine lie on the southwest limb of the Big Bottom syncline and within <br />the same ground water basin. Both operations mine coals from the Williams <br />Fork Formation but the "E" and "F" seams mined by the Eagle No. 6 and No. 5 <br />lie stratigraphically well below the levels mined at Trapper which lie in the <br />upper Williams Fork Formation. <br />The Eagle Mines will impact water quantity and quality in certain bedrock <br />aquifers in the basin. There will be continued water flow from the Trout <br />Creek sandstone into the No. 5 workings by means of connecting faults. The <br />Trout Creek aquifer will continue to be used to supply water both for mine and <br />domestic purposes within the permit area. No degradation of quality of water <br />in the Trout Creek sandstone by future operations in the Eagle No. 5 and No. 6 <br />Mines is anticipated. <br />The quantity of water in the Middle sandstone has been impacted in the past by <br />inflow into the Eagle No. 5 tAine from the sandstone thru a series of <br />connecting faults. While this particular impact has apparently lessened with <br />time, an increase in future inflow from the Middle sandstone is projected as a <br />result of the expansion of long wall mining in the No. 5 and No. 6 Mines, the <br />resulting subsidence and fracturing of the overlying section, and the relative <br />proximity of the Middle sandstone to the mining levels. Degradation of water <br />quality in the Middle sandstone may occur following closing of the mines and <br />their subsequent flooding. The buildup of static head in the mines could <br />force degraded water back from the mines into the Middle sandstone by way of <br />• <br />-42- <br />