SECTION 252:517-7-71. Plugging requirements

(a)   Boreholes. Unless it is to be converted to a piezometer or monitor well within thirty days of drilling, all boreholes shall be plugged in accordance with the requirements of OAC 252:517-7-3.

(b)   Piezometers and monitoring wells. All piezometers and monitoring wells that will not become part of the groundwater monitoring system shall be plugged according to the requirements of OAC 252:517-7-3.

(c)   Other subsurface penetrations. All water wells, oil and gas wells and other borings located within the proposed disposal boundary shall be plugged if they will not be utilized.

(d)   Casing extraction. The casing of monitoring wells and piezometers shall be extracted prior to plugging.

(1)   Piezometers. The surface seal and casing shall be removed from the borehole and a tremie pipe shall be used to fill the hole from the bottom to four feet (4') below ground surface.

(2)   Monitoring wells.

(A)   The protective bollards and concrete pad shall be removed.

(B)   The surface seal and well casing shall be removed by perforating the bottom cap and filling the casing with appropriate plugging material as the casing is being pulled from the borehole, or the casing may be extracted by over-drilling.

(e)   Alternative. In areas where all or part of the well's casing and other components of the well cannot be removed and plugged in accordance with this Part, the DEQ may allow the placement of a cement-bentonite grout inside the wells casing, from the bottom of the well to the ground surface. In this event, the owner/operator must demonstrate that the annular seal is adequately sealed and must submit documentation, prior to plugging the well, that demonstrates removal of all or part of the well's casing and other components.

[Source: Added at 33 Ok Reg 1469, eff 9-15-16]