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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 criteria for azeas without replaced topsoil, pursuant to Rule 4.15.10(1), is 47 percent vegetational cover. The cover standard for riparian azeas is 55 percent cover. Ripazian areas along Oak Creek were disturbed prior to August 3, 1977. No topsoil was salvaged in these areas, and so diversity will be evaluated accordingly. The Division finds that the cover standazds for non-topsoiled and riparian 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 areas will be utilized to determine revegetation success in a manner which the Division finds acceptable 4.15.7(4)j. 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 MSHA and the Colorado Division of Mines. The variance was granted by MSHA based on the thickness of material vertically separating the current strip operation from previous underground workings (4.19(1) and 4.22.4(1)). VIII. Operations on Alluvial Valley Floors Alluvial Valley Floor Identification Information on alluvial valley floors can be found in in the permit application in: 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. 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 aze referred to as Qtl and Qt2, as shown on Map 2.5-21. 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. Etlna Mine 26 Permit Renewal No. 4