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For areas to be used as cropland, success of revegetation shall be determined on the basis of <br />crop production (statistical procedures using vegetation studies) from the mined area as <br />compared to approved reference areas or other approved standard(s). Crop production from <br />the mined area shall not be less than that of the approved reference area or standard for two of <br />the last four years of the liability period established in 3.02.3. Crop production shall not be <br />considered prior to year nine of the liability period. With respect to annual grain crops for which <br />the cropping cycle may incorporate a summer fallow year, two of the last four cropping years <br />will be considered. This liability period shall commence on the date of initial planting of the crop <br />being grown. Production shall be considered equal if it is not less than 90% of the production as <br />determined from the reference area or approved standard with 90% statistical confidence. <br />Emphasis added. <br />5.5.4 Revegetation Success Statistical Procedures - All Irrigated Cropland <br />Revegetation success on all Irrigated Cropland at the New Horizon Mine will be measured <br />based on crop production according to either Rule 4.15.9 or Rule 4.25.5, depending on whether <br />it is Non -prime Farmland or Prime Farmland. In both cases, measuring of the production will be <br />carried out by using the quadrat method listed in Rule 4.15.11(1)(b)(i). The quadrat sampling <br />method listed in this rule will be conducted according to Rule 4.15.11(2) as shown below: <br />Demonstrations of sample adequacy and revegetation success for woody plant density shall be <br />made with one of the following statistically valid approaches in (a), (b), or (c), or with one of the <br />alternative approaches specified 4.15.11(3). <br />(a) If the reclaimed area sample mean is equal to or greater than 90 percent of the relevant <br />success standard, success may be demonstrated by direct comparison if sample size adequacy <br />is demonstrated by the formula below. A minimum of 15 sample observations shall be taken <br />even if statistical sample adequacy is achieved with fewer observations. <br />August 2013 PR -08 2.05.4(2)(e) - 46 <br />