(A) The following is the list of karst geologic features to be identified as part of the karst survey and identified on all required plans:
(1) Sinkhole collapse feature (requires a karst feature buffer as required in § 155.090);
(2) Sinkhole;
(3) Surface drainage that flows into the ground;
(4) Ephemeral lakes after rainfall;
(5) Cave entrance(s) (requires a karst feature buffer as required in § 155.090);
(6) Subsurface cave passages as determined by preexisting cave maps obtained from organizations including the state’s Geological Survey, local cave organizations, and the state’s Speleological Survey;
(7) Springs: evidence of standing water (rings of mud or organic debris in the low areas of closed surface depressions) following rains; and
(8) Sinking stream sink point (requires a karst feature buffer as required in § 155.090).
(B) The following are a list of requirements specific to certain karst geologic features that shall be identified on all required plans when one of these features have been identified:
(1) Sinkholes: location and limits of the area of the sinkhole depression, including topographic boundary of the entire closed depression, any significant breaks in slope, and vertical rock or soil surfaces;
(2) Sinkholes shown on required plans shall also show the location and elevation of the lowpoint;
(3) Caves: diameter and description of cave opening, including description of whether water flows into the subsurface prior to development, either perennially or intermittently;
(4) Springs: the first emergence of a spring and the surface stream downstream from this point;
(5) Sinkhole collapse feature; and
(6) Calculation of pre-development and post-development surface drainage volumes directed toward the low point of the sinkhole, or the sinkhole collapse feature or cave entrance.
(LDC § 4.9.4)