Any wastewater holding facility shall conform to the requirements for seepage control enumerated in paragraphs (1) and (2) of this section. Any such facility in an area underlain by clean sands, fractured limestone, or other strata with exceptionally high permeability may be subjected to additional seepage control requirements.
- (1) Seepage control. A wastewater retention facility shall be constructed in clay soils or lined with a suitable lining material to prevent contaminated wastewater from reaching groundwaters of better chemical quality.
- (2) Permeability data. Permeability tests may be required to show that pond liners are adequately impermeable to prevent excessive seepage. The acceptable seepage rate from ponds shall be less than 0.1 acre-foot of wastewater per surface acre of pond per year. The acceptable permeability coefficient shall be 1.0 x 10[sup]-7[/sup] cm/sec. at one foot of head and with one foot of permeable material or the equivalent thereof. The permeability coefficient shall be determined by constant head laboratory permeameter tests.
Source Note:The provisions of this §321.55 adopted to be effective July 3, 1986, 11 TexReg 2894.