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March 24, 1982. To satisfy the requirements of Rule 4.15.10(1) pertaining to the revegetation success criteria for previously mined azeas, Pittsburg & Midway collected cover data along fifteen (15) transects. From these transects, a mean vegetative cover of 47 percent was obtained. Therefore, the revegetation success criterium for azeas without replaced topsoil, pursuant to Rule 4.15.10(1), is 47 percent vegetatitive cover. The cover standard for ripazian azeas is 55 percent cover. Riparian areas along Oak Creek were disturbed prior to August 3, 1977. No topsoil was salvaged in these azeas, and so diversity will be evaluated accordingly. The Division finds that the cover standards for non-topsoiled and ripazian areas are in compliance with the requirements of Rule 4.15.10. E. The Division approved of the reference areas which the applicant selected based on the requirements of Rule 4.15.7(3). F. The reference azeas will be utilized to determine revegetation success in a manner which the Division finds acceptable [Rule 4.15.7(4)]. VII. Protection of Underground Mining A. The Division approved surface coal mining activities being conducted within 500 feet of an active or abandoned underground mine. This approval was based on the fact that approval for such was granted by Mine Safety and Health Administration (MSHA) and the Colorado Division of Mines. The variance was granted by MSHA based on the thickness of material vertically sepazating the current strip operation from previous underground workings [Rules 4.19(1) and 4.22.4(1)]. VIII. Operations on Alluvial Valley Floors Alluvial Vallev Floor Identification Information on alluvial valley floors can be found Volume 2, Section 2.4; Volumes 3 and 4, Section 2.5; Volume 5, Section 2.9; and Volumes 11 and 12, Section 4.6 of the PAP. The Division has previously found an approximate 700-acre strip of alluvium along Trout Creek to meet the regulatory definition of an alluvial valley floor (AVF). The AVF is the area underlain by the two water-beazing terraces of Trout Creek alluvium that are referred to as Qtl and Qt2, as shown on Map 2.5-21 of the PAP. The AVF designation is based on the presence of unconsolidated stream-laid deposits and the presence of water in sufficient quantity and quality for flood irrigation or subirrigation agricultural activities. C-1980-001 Permit Renewal 5 Findings Page 30 of 33 Pages