Section 312 IAC 25-6-77 - Underground mining; hydrologic balance; water quality standards and effluent limitationsAuthority: IC 14-34-2-1
Affected: IC 14-34
Sec. 77.
(a) All surface drainage from the disturbed area shall be controlled through use of a siltation structure, a series of siltation structures, or such alternative techniques as provided in section 80 of this rule before leaving the permit area. Any discharge of water from underground workings to surface waters that does not meet the effluent limitations of this section shall also be controlled through use of a siltation structure, a series of siltation structures, or such alternative techniques as provided in section 80(b) of this rule before leaving the permit area.(b) Siltation structures and other approved alternate techniques as provided in section 80 of this rule for surface drainage from the disturbed area shall be operated and maintained to achieve applicable federal and state effluent limitations. Siltation structures and treatment facilities for discharges from underground workings shall also be operated and maintained to achieve applicable federal and state effluent limitations.(c) For the purposes of this section only, "disturbed area" shall not include those areas affected by surface operations in which only diversion ditches, siltation structures, or roads are installed in accordance with sections 70 through 76 of this rule, this section, and sections 78 through 132 of this rule.(d) Siltation structures required by this section shall be constructed in accordance with section 81 of this rule, in appropriate locations before beginning any underground mining activities in the drainage area to be affected.(e) Discharges of water from areas disturbed by underground mining activities shall be made in compliance with each of the following: (1) All applicable state and federal water quality laws and regulations.(2) Effluent limitations for coal mining promulgated by the United States Environmental Protection Agency as set forth in 40 CFR 434.Natural Resources Commission; 312 IAC 25-6-77; filed Jun 21, 2001, 2:53 p.m.: 24 IR 3549, eff Dec 1, 2001; readopted filed May 29, 2007, 9:51 a.m.: 20070613-IR-312070146RFA; readopted filed Sep 19, 2013, 10:12 a.m.: 20131016-IR-312130125RFAReadopted filed 3/26/2019, 3:40 p.m.: 20190424-IR-312190011RFA