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III IIIIIIIIIIIIIIII <br /> 1 <br /> RECEIVED <br /> DESIGN REPORT JUN 17 1991 <br /> 1 JOHNSON & SCHOOL SECTION PITS Mined Land <br /> Reclamation Division <br /> 1 <br /> 1.0 PURPOSE AND SCOPE OF STUDY <br /> Chen & Associates prepared a report entitled "Design Report, Erosion <br /> ' Control Measures, School Section and Johnson Pit" dated July 22, 1987 <br /> for Umetco Minerals Corporation. On October 23, 1987, the Mined Land <br /> ' Reclamation Division approved Umetco's technical revision application to <br /> 1 make the Chen report part of the permit. The report provided broadbrush <br /> recommendations for erosion control at the pits and detailed hydrology. <br /> ' The report recommends constructing a few rock check dams to control <br /> erosion areas with large drainage basins. <br /> 1 <br /> This design report examines other options for addressing the flows <br /> from the large basins such as localized ditching and storage enhancements <br /> to minimize the uncontrolled flows into the pits and Umetco hereby submits <br /> this Design Report as an Amendment to Permit M-77-286. The four years <br /> 1 that have passed since the Chen report have provided several insights into <br /> what additional work may be required for long term stabilization. This <br /> Design Report is intended to supplement the Chen report and liberally <br /> 1 refers to it. <br /> 1 <br />