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RULE 2 PERMITS <br />summarized here. The report is included in Exhibit 7 in its entirety. Striffler and Rhodes conducted field <br />tests at the Colowyo Mine on six plots randomly selected and determined a mean soil loss of topsoil of <br />0.54 tons/acre/year. Overburden erosion was calculated at 3.66 tons/acre/year. These values are <br />considerably less than those accepted by the Colorado Mined Land Reclamation Board. Field tests <br />result in a calculated R-factor of 20.0 for use in the Universal Soil Loss Equation. This value is also <br />considerably less than the values of 30.0 accepted by the CMLRB. This study may help to explain why <br />runoff and sedimentation in the Streeter Fill detention pond has been minimal. <br />Rule 2 Permits 2.04.7-24 Revision Date: 6/23/08 <br />Revision No.: MR-91