Section 327IAC6.1-2-55.3. "Surface conduit to a subsurface feature" defined  


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  •   3. "Surface conduit to a subsurface feature" means any surface expression of an enhanced pathway to a natural, geologic formation or manmade workings beneath the land surface. A surface conduit may include a sinkhole, slotted tile riser, or catch basin. A subsurface feature may include underground mines, aquifers, or underground streams. (Water Pollution Control Division; 327 IAC 6.1-2-55.3; filed Jul 7, 2003, 4:25 p.m.: 26 IR 3601; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA)