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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 517. Disposal of Coal Combustion Residuals from Electric Utilities |
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Subchapter 7. Subsurface Investigation |
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Part 5. GROUNDWATER STUDY |
SECTION 252:517-7-53. Piezometer details
Latest version.
- (a) Minimum number. For CCR units of 20 acres or less, at least three piezometers shall be installed.(b) Additional piezometers.(1) For each additional 20 acres of a CCR unit, one additional piezometer shall be installed.(2) In geologically complex areas, the installation of additional piezometers may be required.(c) Piezometer construction. In addition to the requirements of OAC 252:517-7-3, piezometer construction shall include the following.(1) Casing material. The casing must be made of material selected according to groundwater geochemistry, anticipated lifetime of the monitoring program, well depth, parameters to be monitored and other site specific considerations.(2) Rigidity. The casing must be rigid enough to support the borehole and shall have a protective cap over the bottom end.(3) Unconfined aquifer. For an unconfined aquifer, the tops of screens shall be placed at, or no more than two feet above, the water table, and the screen shall extend into the saturated zone.(4) Confined aquifer. For a confined aquifer, screens shall be placed in the saturated zone.(5) Screen length. Screens shall be 5 feet in length, unless otherwise approved by the DEQ.(d) Conversion of piezometers to monitoring wells. If any piezometers are to be converted to groundwater monitoring wells, the piezometers must be converted to meet the standards of OAC 252:517-7-3.