The Department of Environmental Protection (“Department”), Bureau of Abandoned Mine Reclamation, requires a Contractor to drill and install approximately 25 mine pool monitoring wells over a two-year period for a deep mine pool monitoring project, located in the Bituminous Coal Region with projects originating from the Cambria Office, Investigation Section. Contractor shall furnish all labor, technical assistance, equipment, tools and material necessary to perform the contract tasks. Contractor shall drill 25 proposed rotary boreholes, installing casing and completing boreholes, primarily for mine pool monitoring purposes. When requested by the Department, Contractor shall provide a completely mobilized rotary drilling rig on a project site within 14 days of being notified to proceed. Contractor shall mobilize the drilling rig to the work site together with all necessary supporting equipment to create access to individual drilling locations and drill test borings that may range from approximately 50 to 300 feet in depth, with an approximate average depth of 125 feet. Contractor shall install casing pipe and perform required reclamation. Contractor shall drill overburden materials and bedrock to determine subsurface conditions, installing casing pipe and completing each boring as a permanent monitoring well. The bedrock may be fractured and caved due to underground mining. While drilling, Contractor may encounter shallow groundwater conditions and mine voids connected to the pressurized mine pool. Contractor shall advance 25 borings sufficient in diameter to accommodate three-inch inside diameter (I.D.) PVC pipe. Contractor shall advance proposed borings through overburden, bedrock, fractured bedrock, coal and mined coal (voids), into a targeted mine void, and then developed/completed as a mine pool monitor well. For all borings, the required three-inch I.D. PVC casing pipe will be grouted in-place as specified. Contractor shall equip each completed well at the surface with either a nominal four-inch diameter steel well guard with a threaded cap, cemented in-place, or an optional flush-mounted, watertight monitor well cover. The Department shall provide the steel well guard assembly, along with the cap and the flush-mount cover. Contractor shall remove all equipment and seal all abandoned boreholes. Contractor shall ensure that the restoration and the seeding of the surface is to a condition equal to or better than that existing prior to the start of project work.
