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XV. Rule 4.15 Revegetation <br />The approved revegetation plan (starting on page 115 of the PAP) emphasizes native species as <br />illustrated in the seed mix on page 115. <br />A sorghum mulch was approved as an optional means to meet soil stabilization requirements <br />until vegetation is re- established [Rule 4.15.4]. <br />Approved methods to measure herbaceous cover, production, and species diversity are discussed <br />in the PAP, Section 2.04.10. Techniques include selection of sample locations using randomly - <br />generated grid coordinates and random determination of transect directions. A stationary optical <br />sighting device is used to determine hits. Reclamation success for vegetative cover is determined <br />using an approved formula which accounts for effective precipitation. Reclamation success for <br />herbaceous productivity is determined using an approved formula which accounts for effective <br />precipitation. These formulae for reclamation success were derived from data collected on the <br />Osgood reference area over a ten -year period. The Osgood reference area itself is no longer <br />needed for comparison upon approval of TR37 (PAP, Section 2.05.4, page 116b). The <br />reclamation success criteria for species composition are: <br />• A minimum of four perennial species <br />• A minimum of three warm season perennial grass species <br />• For each species, a relative importance of no more than 40 percent or less than <br />three percent. <br />For this permit, there is no minimum density (stems /acre) standard for woody plant <br />reestablishment. <br />XVI. Rule 4.16 Post - mining Land Use <br />The post- mining land use of rangeland meets the criteria of Rule 4.16.3. The site is classified as <br />rangeland by the U.S. Department of Agriculture, Natural Resources Conservation Service, as <br />shown on the general soil map of Weld County, Colorado (page 37 of the PAP). In addition, <br />several gas wells have been installed within the permit area by a third party. These locations <br />have been classified as industrial land use. <br />The proposed postmining land use is compatible with adjacent land use. Demonstrations of <br />feasibility are not necessary. The proposed use will not present actual or probable hazard to <br />public health or safety nor pose actual or probable threat of water flow diminution on pollution. <br />The use will not involve unreasonable delays in reclamation. No measures to prevent or mitigate <br />adverse effects on fish, wildlife, and related environmental values or threatened or endangered <br />plants are necessary (PAP, Section 2.05.6 (2)). <br />19 <br />