The plans are to drill and grout 11 holes to the No 11 works, and remove the failed section of flooring 50' x 75', excavate to a depth of 12 feet and replace with a mixture of class II and No 2 rock with geogrid on vertical spacing of 3 feet. The existing floor should be cut 5 feet from the northern foundation wall. The displaced material will then be taken to the designated waste area approximately 2 miles to the southwest. The grouting efforts can be performed in a sequence to form a perimeter blockage and then place grout within the limits established. The intent is to fill the voids created by mine subsidence with grout, to reduce the potential of future damage. The excavated hole will be backfilled to the subfloor level. The impacted concrete floor will be replaced with 4" reinforced concrete with #3 rebar on 18" centers. All bids shall be accompanied by a bid guarantee (in the form of a bid bond or certified check) of not less than five (5%) percent of the amount of the total bid. A 100% Performance Bond and a separate 100% Payment Bond shall be furnished by the successful bidder. All bonding and insurance requirements are contained in the Instructions to Bidders and/or General Conditions. Bonds should be executed by a surety company authorized to do business in the Commonwealth of Kentucky. The Division of Engineering & Contract Administration, Commonwealth of Kentucky, reserves the right to reject all bids and to waive all informalities and/or technicalities where the best interest of the Commonwealth may be served This project contains the provisions from the Davis Bacon Act. All contractors must pay the suitable amount listed on the federal wage rates for Webster County, Kentucky. The rates are titled General Decision Number KY20230080 dated 01/06/23. See attached.
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