Laserfiche WebLink
PR-12 Exhibit 71 20 <br />4.3.1.5 Raven Gulch <br />Raven Gulch is a perennial stream that drains the east side of the West Flatiron Tract. The Upper Raven Gulch <br />monitoring station is located upstream at the confluence with the West Flatiron drainage. The Lower Raven <br />Gulch monitoring station was added to the monitoring network in 2005 and is located at the mouth of Raven <br />Gulch near its confluence with the North Fork of the Gunnison River. The locations of these monitoring sites are <br />depicted on Map 1. Routine monitoring of the Upper and Lower Raven Gulch monitoring stations began in May <br />2005. <br />4.3.2 Lower North Fork Drainage Basin Sui face Water Monitoring Stations <br />4.3.2.1 North Fork Lower <br />The North Fork Lower monitoring station monitors the North Fork of the Gunnison River down-gradient of the <br />WEM facilities area and mine discharge points (Map 1). <br />4.3.2.2 Lower Gribble Gulch <br />Gribble Gulch is an ephemeral stream that flows only in response to storm events and spring runoff. This stream <br />drainage drains the western WEM panel area. The Lower Gribble Gulch station is located west of the WEM <br />(Map 1) and was established to monitor the effects of mining in the west and northwest mine panel area. <br />4.3.3 Minnesota Creek Drainage Basin Surface Water Monitoring Stations <br />4.3.3.1 Lick Creek Flume <br />Lick Creek is an ephemeral stream that is tributary to Upper Minnesota Creek and flows only in response to storm <br />events and spring runoff. The Lick Creek drainage drains the southern part of the SOD coal lease area (Map 1). <br />This monitoring station was established in 1977 when MCC was planning to develop this tract. The site was also <br />established as part of the Minnesota Creek Water Augmentation Plan (WAVE, 1986). The Stevens continuous <br />recorder at the Lick Creek monitoring station was replaced with a Global Water WL-16 continuous datalogger in <br />March 2007. <br />4.3.3.2 Drv Fork <br />Dry Fork is a tributary stream to middle Minnesota Creek. The Dry Fork drainage drains the northern portion of <br />the SOD area and the area south of the SE mine panel's area adjacent to mine Panels 12 and 13 (Map 1). There <br />are three monitoring stations in the Dry Fork drainage: Upper, Middle and Lower Dry Fork (Map 1). These <br />stations were established to monitor the effects of mining along the drainage and to support the Minnesota Creek <br />Augmentation Plan. Upper Dry Fork Flume was relocated in the fall of 2005. MCC will initiate baseline <br />rnonitoring of this site in the 2006 and routine monitoring will begin in 2007 (Table 7). The existing flume at the <br />Lower Dry Fork monitoring station ?\-as replaced in August 2006. The existing flume at the Middle Dry Fork <br />monitoring station was replaced in May 2007. The Stevens continuous recorder at the Lower Dry Fork <br />monitoring site was replaced N ith a Global Water WL-16 continuous datalogger in August 2006. <br />September 2007 HrdroGeo, Inc. <br />•