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West Elk Mine 2009 Annual Hydrology Report 26 <br />3.2.3.3 Spring G-28a <br />Spring G-28a is located in a north tributary to Gribble Gulch (Map 2). It is situated above <br />the westernmost panels in the NW B-seam mine panels. This spring issues from alluvium and is <br />seasonal. Flow usually occurs during the peak flow period and accumulates in a stock pond. This <br />spring has been monitored since 1978. <br />3.2.3.4 Spring G-31 (Decreed Spring #33) <br />Spring G-31 is located in Gribble Gulch above the east end of the Jumbo Mountain B-seam <br />mine panels (Map 2). This spring issues from alluvium and flows into a small pond. It is seasonal <br />and flow usually occurs during wet spring conditions. The pond is often dry in summer and <br />autumn. This spring has been monitored since 1977. <br />3.2.3.5 Spring G-30 <br />Spring G-30 is located in Gribble Gulch above the east end of the Jumbo Mountain B-seam mine <br />panels (Map 2). It issues from alluvium, but measurable flow has not been observed since WY <br />2001. This spring has been monitored since 1977. <br />3.2.3.6rinQ G-25 (Decreed Spring #22) <br />Spring G-25 is located in the Gribble Gulch drainage and is situated north of the Jumbo <br />Mountain B-seam mine panels (Map 2). It issues from alluvium and flows into a holding pond. <br />This spring has perennial flow which diminishes in late summer. This spring has been monitored <br />since 1977. <br />3.2.3.7 Spring G-35 (Decreed Spring #18,) <br />Spring G-35 is located on the north flank of Jumbo Mountain in an unnamed drainage west <br />of Gribble Gulch which is tributary to the North Fork (Map 2). This spring is situated on the north <br />edge of the Jumbo Mountain B-seam mine panels. This spring issues from alluvium and flows into <br />a holding pond which has water during wet climatological cycles. This spring has been monitored <br />since 1993. <br />3.2.3.8 Spring G-49a <br />Spring G-49a is located on the north flank of Jumbo Mountain, west of Gribble Gulch, in <br />an unnamed drainage tributary to the North Fork (Map 2). The spring is situated north of the <br />Jumbo Mountain B-seam mine panels. Flow is perennial, but diminishes in the autumn. This <br />spring issues from alluvium and hydrological monitoring measurements were historically taken at <br />the end of an outflow pipe from an enclosed spring house. In WY 2009 the outflow pipe stopped <br />flowing and several flows have emerged up-gradient and to either side of the spring house. This <br />spring has been monitored since 1995. <br />• <br />June 2010 HydroGeo, Inc.