Nancy Lee Mine and Mill EE/CA and Design
A site investigation was performed on the Nancy Lee, the largest of nine adits and shafts studied. Work included a reclamation investigation of a 1,500-foot section of Mill Gulch, a tributary of the Clark Fork River, to delineate the impact of mill tailings on surface water and groundwater. Reclamation alternatives presented in an EE/CA allowed for the removal of 7,500 cy of tailings from the channel. MCS oversaw the installation of a permanent monitoring well after repository construction was completed. The steam channel and flood plain were assessed and redesigned to restore Mill Gulch.

Flat Creek Restoration and Bridge Replacement
MCS performed a demolition, reconstruction, and stream
restoration on the Flat Creek bridge that had been
inadequate for current road traffic. The undersized culvert
that channeled the creek was determined to inhibit passage of western cutthroat trout (a Montana listed endanigered species). In addition, the abutments backfill material consisted of tailings and waste rock from historic mining and milling. MCS constructed a temporary mine-waste stockpile, demolished the bridge, removed the mine waste, and installed a new bridge capable of passing listed fish. MCS also performed a CERCLA site investigation along five miles of the creek.

Superior Ranger Station Time-Critical Removal Action
MCS excavated and removed mine waste historically used
as fill at the ranger station, part of a large action by the US Environmental Protection Agency. The design/build project included an investigation to determine the extent and magnitude of the tailings' development of a mitigation-remediation plan; removal of CERCLA hazardous materials; and a removal report.