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colluvium and alluvium. The dissolved solids content of ground water in bedrock units generally <br /> increases basinward from the recharge areas. <br /> The potentiometric surface of ground water in the confined portions of the bedrock units slopes <br /> generally basinward. Local relief on the potentiometric surface likely mimics the overlying <br /> topography, with potentiometric highs and lows roughly coinciding with the overlying highs and <br /> lows of the land surface. The alluvium of Grassy Creek and Fish Creek, and their tributaries, is <br /> either directly recharged by stream flow or discharges to stream flow,depending on stream flow <br /> level. The alluvial aquifers likely contribute to stream baseflow during dry periods. <br /> Natural Springs <br /> The permit application contains information on natural springs in Section 2.04.7,Map 2.04.7 M2, <br /> and Table 2.04.7-T7.2. In addition to spoil springs, an inventory of natural springs and seeps <br /> within and adjacent to the PSC permit boundary identified and sampled nine springs, seven of <br /> which have adjudicated water rights. Flows sampled were less than 5 gallons per minute and <br /> TDS ranged from 430 to 2920 mg/Irange. <br /> Surface Water <br /> Surface water hydrology information can be found in Section 2.04.5 of the permit application. The <br /> information includes baseline data collected in 2008 and 2009. Of approximately 10,164 acres in <br /> the PSC permit area, 9,361 acres are in the Grassy Creek drainage basin and 803 acres are in the Fish <br /> Creek drainage basin. Grassy Creek and Fish Creek are perennial streams that are tributaries of the <br /> Yampa River. Grassy Creek has intermittent or ephemeral tributaries in the PSC permit area that <br /> include Little Grassy Creek, Annand Draw, and Scotchman's Gulch. Fish Creek has an intermittent <br /> tributary in the PSC permit area, Cow Camp Creek. <br /> Grassy Creek flows into the Yampa River approximately two miles north of the PSC permit <br /> boundary. Fish Creek flows into Trout Creek approximately six miles east of the PSC permit <br /> boundary. Trout Creek flows into the Yampa approximately five miles north of the Fish Creek/ <br /> Trout Creek confluence. <br /> Climate <br /> The climate of the region has the characteristics of a continental highland region: low precipitation, <br /> large fluctuations in diurnal temperatures, low humidity,moderate wind,and high levels of <br /> exposure to sunlight. Annual precipitation is historically between 16 and 19 inches based on <br /> records from the adjacent Seneca II-W Mine. <br /> Vegetation <br /> Vegetation in the permit area is predominantly sagebrush grassland,mountain brush,and reclaimed <br /> mine lands. The disturbance area of the PSC contains reclaimed lands, and previously undisturbed <br /> sagebrush/grassland vegetation. <br /> Page 8 of 27 <br />