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Residual subsidence may occur after June 1988 above panel LW1. It is important, <br />for purposes of verifying the accuracy of subsidence projections contained within <br />the permit document, to accurately document the magnitude of subsidence which <br />occurs above this test panel. Conventional semi-annual survey monitoring of the <br />five control points located within the wne of subsidence continued until cessation <br />of subsidence was accurately documented. In the event that any of these conven- <br />tional survey monuments experience more than 1.0 feet of residual subsidence, an <br />additional aerial photographic flight, subsidence map and report will be prepared . <br />for presentation to the Division within one year following cessation of subsidence. <br />Stipulation No. 49 of [he January 17, 1992 Findings Document required that the <br />applicant propose a subsidence control plan for lease COC-51551 in accordance <br />with Rule 2.05.6(6)(c). The terms of this stipulation were complied with through <br />the submittal of Minor Revision No. 72, which was approved on July 1, 1992. <br />The minor revision ro osed a subsidence monitorin ro ram for lease <br />~~ <br />VIII. Operations on Alluvial Valley Floors <br />The permit area and adjacent lands contain three stream channels -the White River, <br />Red Wash, and Scullion Gulch -with enough associated alluvium to be considered as <br />potential alluvial valley floors. All three channels cross the permit area as well as the <br />adjacent area. The permittee's alluvial valley floor analysis is contained in <br />Section II.D of the permit application. Map 102 of Volume 9 of the application shows <br />the extent of alluvial deposits along the three drainages. <br />Below is a detailed consideration of the alluvial valley floor potential of each of the <br />following three drainages: Red Wash, Scullion Gulch and the White River. <br />Red Wash <br />Geomorphic Characteristics <br />Red Wash is an intermittent stream valley which crosses the southeast corner of the <br />permit area. Red Wash receives drainage from both the northern portion and the <br />majority of the eastern portion of the permit area. Several minor tributaries arise <br />within the permit area and drain eastward to Red Wash. Stock-water ponds are <br />located in the Red Wash drainage within and adjacent to the permit area. These ponds <br />typically catch storm runoff for use until it is lost through seepage and/or evaporation. <br />The ponds do not contain water year round. The stream is considered intermittent <br />because ground water discharge may enter the stream during the snowmelt season <br />(Page II.C-18), and because Red Wash receives contributions from springs at higher <br />elevations north of the permit area. Red Wash drains an area of 122.5 squaze miles, <br />approximately 6.6 square miles of which is contained within the permit area. Red <br />Wash enters the White River approximately 1/8 of a mile below the southeast <br />24 <br />