RFB-87-27 24028AMLBAML, JOHNSON COUNTY

***ONLY ONLINE BIDS WILL BE ACCEPTED FOR THIS RFB.*** Emailed and hard copies delivered by any method WILL NOT BE ACCEPTED. On this line, Bidders must enter $0.00 for Contract Amount in the e-procurement system. Actual Contract Amount must be entered on "Official Bid Document" and submitted as an attachment in the e-procurement system.

Vendors should review and update, if necessary, all addresses and contact persons for their account prior to bid submission. This information will carry forward to a contract if awarded, therefore please ensure all information is correct. ** Entire Official Bid Document and Bid Bond (if required) should be combined as one PDF and uploaded**

At the 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.

The subdrain will outlet into a concrete block-tied mat ditch along the driveway to the natural stream. The water body impounded over existing portals will be drained, the two portals closed with non-wildlife accessible closures and drainage features installed to conduct future drainage to the natural stream. Waste material generated by this project will be used as a top treatment above the portal closures.

Waste placement along with grading will make the area nonimpounding. An area north of the Williams Fork stream will be grubbed to assess stability. The portals north of Williams Fork stream will be closed with the wildlife-appropriate portal closure(s) and adjacent unstable roof areas supported using aggregate.

At the downstream area, two portals producing drainage are compromising stability of the yard area adjacent to a residence. These two portals will be excavated, drained and closed with nonwildlife accessible closures and drainage features installed to conduct the water to the natural stream. Three portals north of the natural stream will be closed with wildlife accessible portal closures and adjacent unstable roof areas supported.

The culvert under Williams Branch Road (at end of county maintenance) is structurally compromised and will be replaced with inlet and outlet headwalls installed.

Responses due: 11/3/2026 9:30 AM Public bid opening: 11/3/2026 11:00 AM

NIGP codes: 912 RFB-87-27 24028AMLBAML, JOHNSON COUNTY

Attachments (download from the VSS portal): Final_RFB_785_2700000148_1_SO_FORM.PDF