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-9- above the extracted coal seam which ate significantly less than observations contained within the current technical literature. The conclusion is that no adverse impacts of subsidence upon the hydrologic balance of water rights ate anticipated from the planned underground mining activities. The applicant will have to furthec justify the assumptions concerning extent of caving, fracturing and hydrologic impact. In addition, the applicant should develop a means of verifying p[ojected affects upon the hydrologic balance. In specific, potential hydrologic effects upon the "overburden aquifer" and the Twentymile Sandstone aquifer will have to be monitored. VIII. Alluvial Vallev Floors (2.06.8, 4.24) The Division has reviewed the alluvial valley floor sections of the Foidel Creek underground mine permit application, and the Eckman Patk permit application. The information provided is sufficient to complete the requited alluvial valley floor determinations for portions of Fish Creek and Foidel Creek. Preliminary AVF determinations have been made. These preliminary determinations will be expanded and formalized at a later time. If the applicant chooses to provide additional information, addressing those areas coveted by the assumptions, the alluvial valley floor determination could be refined. Map 9 of the Foidel Creek Mine permit application and Map 6 of the Eckman Pack Mine permit application identify unconsolidated streamlaid deposits in and adjacent to the proposed permit area. Areas shown on Map 6 that lie along Middle Creek or on Foidel Cceek upstream of the proposed mining operation would not be affected and need not be considered further. Areas of unconsolidated streamlaid deposits along Foidel Creek and Fish Creek that ate located adjacent to the proposed mining operation and downetceam from the mining operation could potentially be affected by the mining operation. Alluvial valley floor determinations and the appropriate findings will be made for these areas. Fish Creek Map 6 of the Eckman Park permit application shows unconsolidated etreamlaid deposits located along Fieh Creek beginning several miles upstream of the proposed mining operation down to the confluence with Trout Creek. The permit application concedes that Fish Creek has been determined to be an alluvial valley floor based upon the capability for aublrrigated agriculiucal activities. The applicant has not identified any historic or existing flood Sttlgated areas along Fish Creek. However, records of the State Engineer's Office show several existing stream diversions located on Fish Creek