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The work covered by this section consists of sealing abandoned wells at locations shown on the plans or as directed by the Engineer in accordance with the provisions of these specifications. All work shall conform to the current requirements of the North Carolina Department of Natural Resources and Community Development.
Each well shall be sealed prior to clearing and grubbing the well site.
The well shall be checked from land surface to the entire depth of the well before it is sealed to ensure freedom from obstructions that may interfere with sealing operations.
Prior to sealing, chlorine shall be placed in the well in sufficient quantities to produce a chlorine residual of at least 100 milligrams per liter in the well.
All casing and screen materials may be salvaged except casing that has been cemented in place. In the case of gravel-packed wells in which the casing and screens have not been removed, the casing shall be perforated opposite the gravel pack at intervals not exceeding 10 feet.
"Bored" wells shall be completely filled with cement grout or dry clay compacted in place.
Wells constructed in unconsolidated formations shall be completely filled with cement grout by introducing it through a pipe extending to the bottom of the well which can be raised as the well is filled.
Wells constructed in consolidated rock formations or that penetrate zones of consolidated rock may be filled with sand or gravel opposite the zones of consolidated rock. The top of the sand or gravel fill shall be at least 5 feet below the top of the consolidated rock. The remainder of the well shall be filled with cement grout only.
After the well has been abandoned, the Contractor shall complete a certified well abandonment record (Form GW 30) and shall submit this record to the Engineer.
The quantity of sealing abandoned wells to be paid for will be the actual number of wells which have been acceptably sealed in accordance with the requirements of this provision.
The quantity of sealing abandoned wells, measured as provided in Article 2053, will be paid for at the contract unit price each for "Sealing Abandoned Wells." Such price and payment will be full compensation for all work covered by this section including but not limited to chlorinating the well prior to sealing; perforating the well casing; filling the well with cement grout, dry clay, sand, or gravel; and furnishing all necessary records.
Payment will be made under:
Sealing Abandoned Wells Each