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<br />Groundwater Hydrology <br />Identification of Aquifers --Each of the geologic formations present <br />on the lease is known to produce.some-.water to=wells in the Canyon City- <br />Florence area. However, all are considered poor or poor-to-moderate <br />aquifers and generally gield only small quantities of water (less than <br />10 gpm) to stock or domestic wells. <br />The most extensive aquifer in the vicinity is the Trinidad <br />Sandstone. This sandstone unit is relatively uniform throughout the <br />basin and can produce small to moderate quantities of water. The <br />Trinidad Sandstone outcrops approximately 2 miles east of the lease <br />tract and all mining in the overlying Vermejo Formation will be <br />conducted 300 to 400 feet above the formation contact. Consequently, <br />extraction of the Pine Gulch and Red Arrow coals should not impact <br />the Trinidad Sandstone. <br />All raining and surface excavation will occur in the Vermejo <br />Formation. This formation contains numerous sandstones and coal seams <br />which store and are capable of transmitting groundwaters. However, <br />these sandstones and coals are highly lenticular and interbedded with <br />numerous mudstones and siltstones. This can be observed in the <br />high walls of the operating surface mines in the a-ea. <br />This was confirmed by Mann in his <br />work in the area in 1957. :2ann observed: <br />"AI1 of the Vermejo beds are lenticular. Only a few coal <br />and sandstone layers can be traced laterally more than a <br />few hundred yards before wedging out. None has been <br />correlated from the east to the west side of the <br />~._ syncline, a distance o:- 2-4 miles." <br />z_c <br />