87-27 24028AMLBAML, Johnson County RFP

Description: Project consists of upstream area of the project, two portals producing drainage are compromising stability within a pasture area. These two portals will be opened, drained, closed with non-wildlife accessible closures and capped with excavated material with drainage features installed to conduct mine water to the adjacent natural drain. Excess material will be transported to the onsite waste area. A class iii ditch and culvert will be installed in the natural drain to protect the drainage features and conduct the collected drainage ultimately to the natural stream. At the middle area, a slide threatening a structure, open and draining portals and a water body impounded above open portals are causing stability and safety concerns. The slide will be addressed by excavating to rock and installing subdrain between the structure and the slide area.