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West Elk Mine • 2. Flow measurement estimates, water quality sampling and/or field water quality parameter measurements at springs above the F Seam, springs above the $ Seam in the North Fork drainage, springs/ponds in the Jumbo Mountain area, springs in or below the F Seam in the North Fork drainage and springs above the E Seam in the Dry Fork drainage. This monitoring program information has been used to estimate the PHCs from both a quantity and quality standpoint. Surface water hydrologic consequences are described in this section for the following: • Streams (surface drainages) • Springs • Reservoirs and stock ponds • Wetlands • Water rights • Mine water system, including North Fork water, sanitary water, mine water, and runoff from disturbed azeas Streams Stream hydrology and sediment transport have been conceptually quantified for the permit azea by WWE and Mr. Ernest Pemberton, P.E. Mr. Pemberton was formerly the Chief Engineer for the U.S. Bureau of Reclamation, Sedimentation and River Hydraulic Section. He is a respected expert in the field. Exhibit 55 was prepared to address drainage basin characteristics and evaluate the potential effects due to mining in the Apache Rocks and Box Canyon permit areas. Since mining activities are still active in these areas, Exhibit 55 has been retained in the permit. However, the following text focuses on the drainages in the South of Divide permit area, which is also found in Exhibit SSA, but includes key findings of Exhibit 55 for the Apache Rocks and Box Canyon permit areas. Background on Stream Channels and Hvdrologv The Box Canyon and Apache Rocks permit revision azeas include a portion of Sylvester Gulch, Box Canyon, the unnamed drainage west of Box Canyon, and a tributory to Raven Gulch. Approximately 1,080 acres of the Apache Rocks permit revision azea is located within the Dry Fork of Minnesota Creek basin. That portion also includes parts of the Horse Gulch, Pond Gulch, and Slide Gulch drainages, as well as two unnamed drainages east of Horse Gulch. The Apache Rocks permit revision azea totals 2,502 acres and 1,424 acres (57 percent) are in the North Fork drainage. All of the 1,440 acres within the Box Canyon permit revision and 690 acres in the West Flatiron area are within the North Fork basin. Nearly all of the South of Divide permit area is located within the Minnesota Creek drainage basin. The exception is the small portion that extends east through Section 35, which is part . of the Deep Creek drainage basin. In fact, of the 8.18 square miles that make up the permit revision area, approximately 5.18 square miles (or 63 percent) is located within the Dry Fork 2.05-187 Revised June 2005 PRIO, January 2006, March 1006; Rev. May 1006 PRIO