<html xmlns="http://www.w3.org/1999/xhtml"><head><meta charset="UTF-8" /><title></title><meta name="Generator" content="PowerTools for Open XML" /><style>span { white-space: pre-wrap; } p.s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0 { margin-top: 0; margin-bottom: 0; margin-left: 0; margin-right: 0; text-indent: 0.00in; text-align: justify; background: white; font-family: 'Times New Roman', 'serif'; font-size: 12pt; line-height: 108%; } span.s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0 { background: white; font-family: 'Times New Roman', 'serif'; font-size: 12pt; font-style: normal; font-weight: normal; margin: 0; padding: 0; } span.s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000000 { color: #0000FF; background: white; font-family: 'Times New Roman', 'serif'; font-size: 12pt; font-style: normal; font-weight: bold; margin: 0; padding: 0; } span.s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000001 { background: white; font-family: 'Times New Roman', 'serif'; font-size: 12pt; font-style: normal; font-weight: bold; margin: 0; padding: 0; } span.s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002 { background: white; font-size: 12pt; font-style: normal; font-weight: normal; margin: 0; padding: 0; } span.s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000003 { color: #0000FF; background: white; font-family: 'Times New Roman', 'serif'; font-size: 12pt; font-style: normal; font-weight: normal; margin: 0; padding: 0; } </style></head><body><div><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    </span><a href="https://sdlegislature.gov/Rules?Rule=74:36:21:02"><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000000">74:36:21:02</span></a><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000001">.  Definitions.</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">Terms</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> used in this chapter</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> mean</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">:</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (1)  "Adverse impact on visibility</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">"</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">visibility impairment that interferes with the management, protection, preservation, or enjoyment of the visitor's visual experience of the mandatory Class I federal area;</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (2)  "BART</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">" best available retrofit technology;</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (3)  "Best available retrofit technology</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">" an emission limitation based on the degree of reduction achievable through the application of the best system of continuous emission reduction for each pollutant that is emitted by an existing stationary facility;</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (4)  "BART-eligible source</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">"</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">an existing stationary facility;</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (5)  "Coal-fired power plant</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">" any person, corporation, limited liability company, association, company, partnership, political subdivision, municipality, rural electric cooperative, consumers power district, or any group or combination acting as a unit, owning or holding under lease or otherwise</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> real property used, or intended for use, for the conversion of coal into electric power;</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (6)  "Contribute to adverse impact on visibility</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">"</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> </span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">a change in visibility impairment in a mandatory Class I federal area of five-tenths deciviews or more, based on a </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">twenty-four</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">-hour average, above the average natural visibility baseline;</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (7)  "Major source</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">" as defined in </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">subdivisions</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> </span><a href="https://sdlegislature.gov/Rules?Rule=74:36:01:08"><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000003">74:36:01:08</span></a><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">(2) and (3);</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (8)  "Mandatory Class I federal area</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">" any area identified in 40 C.F.R. </span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">Part </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">81, Subpart D (July 1, 20</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">24</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">);</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (9)  "Visibility impairment</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">" any human</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">-</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">perceptible change in visibility such as light extinction, visual range, contrast, coloration, from that which would have existed under natural conditions;</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (10)  "</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">Thirty</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">-day rolling average</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">"</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> an amount</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> expressed as pounds per million Btus and pounds per hour</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> averaged over thirty operating days</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">; and</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    (11)  "Operating day</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">,</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">" a </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">twenty-four</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">-hour period between midnight and the following midnight during which any fuel is combusted at any time in the </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">period, even if fuel is not</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> combusted</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> during</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> the entire </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">twenty-four</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">-hour period.</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000001">Source:</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> 37 SDR 111, effective December 7, 2010; 38 SDR 39, effective September 19, 2011; 39 SDR 219, effective June 25, 2013; 42 SDR 52, effective October 13, 2015; 44 SDR 43, effective September 13, 2017; 46 SDR 64, effective November 25, 2019</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">; 52 SDR 27, effective September 17, 2025</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">.</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000001">General Authority:</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> SDCL </span><a href="https://sdlegislature.gov/Statutes?Statute=34A-1-6"><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000003">34A-1-6</span></a><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">.</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">    </span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000001">Law Implemented:</span><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0"> SDCL </span><a href="https://sdlegislature.gov/Statutes?Statute=34A-1-1"><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000003">34A-1-</span><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0-000003">1</span></a><span class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dC0">.</span></p><p dir="ltr" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1dP0"><span xml:space="preserve" class="s9548de99-85d0-4d2d-96c2-7a0efff19e1d000002"> </span></p></div></body></html>