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-9- above the extracted coal seam which are significantly leas than observations contained within the current technical litecatuce. The conclusion is that no advecae impacts of subsidence upon the hydrologic balance of water rights ate anticipated from the planned underground mining activities. The applicant will have to fucther justify the assumptions concerning extent of caving, fcactucinq and hydrologic impact. In addition, the applicant should develop a means of vecifyinq pcojected 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 Flooca (2.06.8. 4.241 The Division has reviewed the alluvial valley floor sections of the Foidel Creek underground mine permit application, and the Eckman Park permit application. The information provided is sufficient to complete the required alluvial valley floor determinations for portions of Fish Creek and Foidel Creek. Preliminary AVF.detecminations 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 covered by the assumptions, the alluvial valley floor determination could be refined. Map 9 of the Foidel Cceek Mine permit application and Map 6 of the Eckman Park 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 Fieh Creek that ace located adjacent to the proposed mining operation and downstream 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 ateae.~ Fish Creek Map 6 of the Eckman Park pecmiC application shows unconsolidated streamlaid deposits located along Fiah Creek beginning several miles upstream of the proposed mining operation down to the confluence with Trout Cceek. The permit application concedes that Fish Creek has been determined to be an alluvial valley floor based upon the capability for aubirrigated agricultural activities. The applicant has not identified any historic or existing flood irrigated areas along Fish Creek. However, records of the State Engineer's Office show several existing stream diversions located on Fish Creek