2001-02-21_REVISION - M1977493 (4)

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• 0 • this citation was a formal Dust Suppression Plan approved by the Colorado Air Pollution Control Division (APCD) on October 30, 1986 and the MLRB on March 25, 1987. Among other control technologies, Climax agreed to initiate a program to cap the tailings dams and exposed beach areas on Mayflower and Robinson tailings impoundments. A dust suppressant would continue in use on the active Ten Mile tailings impoundment. Capping activities began on No. 5 dam in 1989-1990 and the beach areas of the Mayflower impoundment shortly thereafter. Readily available capping material was in short supply for the Mayflower site. Following geological and geotechnical investigations, an adequate supply of capping material was located directly adjacent to the Mayflower impoundment along the southeast edge. This material was quarried from a 14.70 acre adjacent site and directly applied to the face of No.5 dam and to the Mayflower beach areas to eliminate blowing dust. 1.3 Storke Complex Return Water Pipeline Systems The underground mining complex at Climax ceased production in 1987 and was closed entirely and allowed to flood in the early 1990s. Consequently, the facilities comprising the Storke level complex on the south side of Fremont Pass no longer were needed and were closed, decommissioned, demolished, and reclaimed as mandated by the approved reclamation plan as amended. Closure, however, did not terminate Climax responsibility for managing water draining from the closed underground operation. These waters were collected at the Storke pump station and in No. 5 shaft, the remaining structure at the Storke complex, and pumped back into the primary water collection and treatment system north of Fremont Pass at Climax. In late 2000, Climax reevaluated the Storke complex water return systems and detemined that consolidation of all drainage waters at one point was more efficient and effective for future water management. Additionally,the water return system from the No. 5 shaft is somewhat antiquated and requires upgrading and realignment. 2.0 RATIONALE AND SCOPE FOR TECHNICAL REVISION/AFFECTED LAND EXCHANGE On September 26, 2000, Mr. Allen Sorenson, DMG Reclamation Specialist, conducted an inspection of surety reduction sites proposed by Climax. During this inspection, it was noted that the borrow area for the Mayflower impoundment and No. 5 dam capping material had not completely or adequately revegetated. Closer inspection of the southeastern limits of the borrow site and subsequent comparison with a map of the affected lands as defined in AM-003 revealed 4