Specifications include, but are not limited to:The proposed scope of work for the 2016 Wilton Phase 2 AML Project involves rotary drilling and pressure-grout backfilling of abandoned underground mine workings, and the performance of other associated work items as specified. Subsurface reclamation (drilling and pressure-grout backfilling) will be conducted underneath and adjacent to roadways and structures as deemed necessary by the Commission’s Project Manager or his authorized representative. All references to the Commission’s Project Manager includes any representative authorized to make decisions for the Commission’s Project Manager. It is expected that the abandoned mine workings will be predominantly wet or inundated. Varying stages of mine collapse are evident with conditions ranging from open or partially open voids to heavily rubblized areas. Boreholes that penetrate void/rubble areas will be used to pressure-inject grout to stabilize subsurface formations to reduce the potential for surface subsidence. Contractor is advised that portions of the sites are located within areas containing abandoned underground mine workings. Surface subsidence caused by upward void migration of abandoned mine workings has been documented within the general area. Contractor is required to understand that drilling, grouting, surface restoration and associated work specified in this IFB is inherently dangerous due to the location of the project and the presence of the abandoned mine workings. Contractor is required to take all necessary precautionary steps to adequately protect their work force, equipment and the general public at all times during project performance
