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PROPOSED DECISION - Canadian Strip/Phase II Bond Release <br />October 1, 1990 <br />Page 3 <br />TABLE 2: Summary of SEDCAD+ <br />Results Using the Upland Particle Size Distribution in the Analysis <br /> Runoff Peak <br /> Mining Volume Discharge Sediment <br />Watershed Situation (ac-ft) (cfs) (tons) <br />1 Pre- 2.06 12.61 12.8 <br />1 Post- 1.90 15.26 3.3 <br />2 Pre- 1.08 $.78 5.3 <br />2 Post- 1,04 4.99 4.5 <br />3 Pre- 0.22 2.25 1.1 <br />3 Post- 0.05 0.45 0.1 <br />TABLE 3: Summary of SEDCAD+ <br />Results Using the Sediment Pond Particle Size Distribution in the Analysis <br /> Runoff Peak <br /> Mining Volume Discharge Sediment <br />Watershed Situation (ac=ft) ~ (cfs) (tons) <br />1 Pre- 2.06 12.61 12.8 <br />1 Post- 1.90 15.26 3.3 <br />2 Pre- 1.08 8.78 5.3 <br />2 Post- 1.04 4.99 4.5 <br />3 Pre- 0.22 2.25 1.1 <br />3 Post- 0.05 0.45 0.1 <br />On June 20, 1990, a partial inspection focusing on erosional stability <br />was performed at the Canadian Strip Mine. In attendance were Cathy 8egej <br />and Susan McCannon, of CMLRD, Mark Humphrey, of the OSM WTC in Denver, <br />Jeff Zingo, of OSM Albuquerque Field Office and Bill Hill, Grey stone <br />Development Consultants and permitting liaison for Wyoming Fue] Company's <br />request for Phase II Bond Release. <br />Mark Humphrey had worked extensively with a classification system on <br />erosion developed by Ronnie Clark and described in USDI-BLM Technical <br />Note #346, Erosion Condition Classification System. This document <br />describes a method for quantifying the degree of erosion at a site and <br />the subsequent organization of the data into erosion classes entitled <br />stable, slight, moderate, critical or severe erosion conditions. In <br />addition, the document suggests that the moderate erosional condition <br />