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West Elk Mine • Table 16 Location. Flow, and Overburden Thickness for Sorinas in the Permit Area Spring Basin Flow Range (gpm) Source Overburden Thickness Overburden Thickness Spring Fall (feet from B- Seam Mining) (feet from E- Seam Mining) D-8 D F rk 2. 480 J-5 D Fork .94-6.0 See 500 21 D Fork 3.75-7. 1.25-11.5 2 J-2 Lick Creek ee *-0.23 ee -0. 3 WCC- 2 Lick Creek See ' 420 R- Lic reek S 500 R-10 Lick Cr k See AC 650 WC - Lick C k 9 92 =One Measurement Only C = Colluvium A =Alluvium M =Snow Melt interference B =Bedrock S =Fed by upgradient spring ' =Post-mining Data z =Resource has been undermined, but data are baseline. Since 1978, dischazge rate data have been collected from 83 springs. Flow rates range from 0 gpm to 120 gpm. It is important that a majority of the springs have at least 300 feet of overburden above the highest seam to be mined. The significance of this is discussed in detail in the Probable Hydrologic Consequences discussion in Section 2.05.6. Four springs in the permit area exhibit significant flows: Spring G-26a (peak flow during spring runoff up to 75 gpm) in Lone Pine Gulch, G-24 (up to 120 gpm) in Sylvester Gulch, and G-25 (up to 90 gpm) and G-31 (up to 45 gpm) in Gribble Gulch. The springs with the lazgest past flow rates in the Apache Rocks permit revision area aze identified as D-2, J-4, and J-10 with peak discharge rates ranging from 8.9 gpm to 30 gpm. The flow rates of all springs aze highly seasonal. Most spring flows will peak during the late spring/eazly summer and will diminish throughout the summer until only flowing at a trickle or drying up. The increased flows usually will not return un61 the following spring except for short duration flows in response to intense storm events. An ideal example of the seasonal cycle is represented by Spring G-26a located in Lone Pine Gulch, (see Map 37) and shown in Figure 11. There are approximately 50 springs in the South of Divide permit area. Most of the springs are located along the valley floors of Dry Fork, Poison Gulch, and Lick Creek. There is only one spring (Spring 21 -Deer Creek Domestic Springs Pipeline) that has been decreed in the South of Divide area to the south of Minnesota Reservoir. The State Engineer's Of£-ce does not have diversion records for the structure, so it is not clear if the spring is still in use. There are three springs (WCC-24, J-7, and J-2) that had flow at all of the initial observations (Map 37). Of these springs only J-7 is within the influence of the projected longwall panels. Spring J-7 is located along Dry Fork with an overburden depth of 680 feet over longwall panel E2. 2.04-104 Revised November 1004 PRIO