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commencement and magnitude of subsidence movements. The "E" Seam Longwall Subsidence Monitors" map submitted with the semi-annual subsidence report depicts the location of monuments to be installed and structures to be monitored within the permit and adjacent azea. The results of the monitoring program will be submitted to the Division semi-annually. The monitoring program is designed to extend for a time, beyond cessation of mining in any azea, consistent with the need for verification of the subsidence prediction. XI. Operations on Alluvial Valley Floors The applicant has deternned that alluvial valley floors exist along both the Yampa and the Williams Fork valleys within the pernut and adjacent azea. This determination is based upon the fact that flood-irrigated agricultural activities are practiced on unconsolidated streamlaid deposits along both rivers. The Division concurs with this determination. The boundary of the alluvial valley floors is shown on Map 25 of the permit application. Three alluvial valley floors have been identified; the Williams Fork alluvial valley floor, the Yampa River/Big Bottom alluvial valley floor, and the Yampa River/Round Bottom alluvial valley floor. Alluvial Valley Floor Exemption Mining operations that, in the yeaz preceding August 3, 1977, 1) produced coal in commercial quantities and were located within or adjacent to alluvial valley floors, or 2) obtained specific permit approval from the State to conduct surface coal mining and Reclamation operations within an alluvial valley floor, are exempted under Rule 2.06.8(5)(a) from the alluvial valley floor provisions prohibiting mining in or adjacent to certain alluvial valley floors. On November 12, 1980, Empire Energy Corporation submitted a request to exempt their existing and proposed mining operations from these alluvial valley floor provisions. (See Exhibit 4 of the permit application.) After reviewing that submittal, the Division determined that both the Eagle No. 5 Mine and the Eagle No. 9 Mine were eligible for the exemption. Materials on file with the Colorado Office of Active and Inactive Mines ("Operator's Monthly Coal Report") indicate that coal was produced in commercial quantities from the Wise Hill No. 5 Mine (now called the Eagle No. 5 Mine) in the year preceding August 3, 1977. Specific permit approval was granted for the Wise Hill No. 9 Mine (now called the Eagle No. 9 Mine) by the Mined Land Reclamation Boazd on Mazch 24, 1977. Stratigraphic extent of the exemption is limited to the actual extent of the mine workings on August 3, 1977, and adjacent lands for which there existed demonstrable financial or regulatory commitment to mine in the future. Mine maps on file with the Colorado Office of Active and Inactive Mines detemune the geographical extent of the azea exempted for the Eagle No. 5 Mine. The geographical extent of the azea exempted for the Eagle No. 9 Mine was determined from the No. 9 Mine Projection Map dated 34