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Section 816.116 (b) Continued. <br />averages from "Climatological Data", U.S. Dept. of Commerce, National <br />Oceanic and Atmospheric Administration; or from other official records; <br />or <br />(ii) Based on 10 years of continuous and reliable precipitation records <br />from stations located in or adjacent to the mine plan area. <br />(3) The ground cover and productivity of the revegetated area shall be <br />considered equal if they are at least 90 percent of the ground cover and <br />productivity of the reference area with 90 percent statistical confi- <br />dence, or with 80 percent statistical confidence on shrub lands, or <br />ground cover and productivity are at least 90 percent of the standards <br />in a technical guide approved pursuant to 30 CFR 816.116(b)(1). Excep- <br />tions may be authorized by the regulatory authority under the following <br />standards: <br />(i) For previously mined areas that were <br />mente of this Subchapter, as a minimum the <br />shall not be less than can be supported by <br />other suitable material in the reaffected <br />the ground cover existing before redisturb+ <br />control erosion; <br />not reclaimed to the require- <br />ground cover of living plants <br />the best available topsoil or <br />area, shall not be less than <br />ince, and shall be adequate to <br />(ii) For areas to be developed for industrial or residential use less <br />than 2 years after regrading is completed, the ground cover of living <br />plants shall not be leas than required to control erosion; and <br />(iii) For areas to be used for cropland, success in revegetation of <br />cropland shall be determined on the basis of crop production from the <br />mined area as compared to approved reference areas or other technical <br />guidance procedures. Crop production from the mined area shall be equal <br />to or greater than that of the approved standard for the last two con- <br />secutive growing seasons of the 5 or 10 year liability period esta- <br />blished in (b)(1) of this Section. The applicable 5 or 10 year period <br />816-159 <br />