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La Plata Coal Draft Finings - 10 - May 18, 1987 <br />overlie the operations. As these aquifers are not contiguous, and are not put <br />to any use in this area, no impact to the hydrologic system will be realized. <br />Water from disrupted perched systems may discharge from up-dip mining entries <br />(La Plata No. 1). Water flowing into down-dip mining operations (King Coal, <br />Blue Flame) will tend to flow away from the mine entries, perhaps recharging <br />the coal face when mining has ceased. <br />Due to the hydrologic and geologic characteristics of the Menefee Formation, <br />as well as local topographic controls, no significant hydrologic impacts to <br />this system are anticipated. <br />The Hay Gulch AVF has been identified as an aquifer in the study area. The <br />Blue Flame, La Plata and King Coal Mines have been designed to minimize, to <br />the extent possible, impacts to the alluvial aquifer. The sediment ponds at <br />the National King Coal, Inc., operation have never discharged into the AVF. <br />The proposed sediment pond at the Blue Flame site as well as the existing <br />La Plata sediment pond, have been sized to store the runoff from a 10 year, <br />24-hour storm event. No discharge is expected from any of these ponds due to <br />a storm.event of lesser magnitude, or as a result of snowmelt. Furthermore, <br />monitoring of the alluvial aquifer down gradient from the National King Coal, <br />Inc., operation, indicates that the quality of the alluvial aquifer is not <br />being diminished by coal mining operations. Alluvial water quality monitoring <br />programs committed to by both La Plata and National King Coal, Inc., will help <br />delimit the potential for future impacts to this alluvial system. <br />Due to the hydrologic characteristics of the Hay Gulch Alluvial Aquifer, and <br />to the manner in which the mining operations are, or are proposed to be, <br />conducted, it has been determined that no significant cumulative hydrologic <br />impacts to the alluvial aquifer will occur. <br />Pursuant to Colorado Revised Statutes 34-33-114(20)(C), the Division has <br />assessed the probably cumulative hydrologic impacts to the ground water and <br />surface water basins defined in this document, from permitted and anticipated <br />mining operations. <br />The Division finds that the La Plata Coal operation has been designed to <br />prevent material damage to the hydrologic balance outside the permit area. <br />The operator is in compliance with this section. <br />XXII. Subsidence - Rules 2.05.6(6) and 4.20 <br />La Plata Coal Corporation has conducted apre-mining survey of the proposed <br />permit area. This survey has demonstrated that no renewable lands overlie the <br />La Plata Mine No: 1. <br />Division subsequent to each survey. <br />As the surface expression of subsidence features has been observed at nearby, <br />abandoned coal mines, La Plata Coal Corporation has committed to establishing <br />and monitoring four monuments overlying the proposed mining operation. These <br />monuments will be surveyed twice a year, with the data being submitted to the <br />The operation is.in compliance with the requirements of this section. <br />9775E /lal <br />