Laserfiche WebLink
_12_ <br />VII. Alluvial Vallev Floors - Rules 2.06.8 and 4.24 <br />Identification of Alluvial Valley Floors <br />The applicant has identified an alluvial deposit extending approximately <br />1 mile to the east (upstream) and 3 miles to the southwest (downstream) <br />of the permit area along the North Fork of the Gunnison River (Map 2). <br />Lands upstream from the permit area are not a part of the hydrologic <br />system that could be affected by the Terror Creek operation therefore no <br />determination will be made by the Division for those lands at this time. <br />The valley bottom complex 1n the immedlate.vicintty of the proposed <br />permit area (i.e., sections 15 and 22) consists of the current flood <br />plain of the North Fork of the.Gunnlson and a sloping colluvial deposit <br />which rises above the flood plain to the north. Cropland, primarily <br />fruit orchards and hayland, exists on both the colluvium and the flood <br />plain 1n the vicinity and 1s irrigated with water diverted from the Deer <br />Trail Ditch which roughly parallels State Highway 133 along the northern <br />border of the proposed permit area. <br />Detailed site geology (Map 11) and land use information (Map 4) provided <br />yithin the application with regard to the colluvial deposit is limited to <br />an area extending approximately 1,500' in all directions from the <br />proposed permit boundary. An evaluation of the colluvial deposit with <br />respect to alluvial valley floor inclusion will be limited to that <br />portion of the deposit mapped as Qc (unconsolidated colluvium) on Map 11. <br />Construction of the load-out pad and haul/access road within the proposed <br />permit area has disturbed approximately 13 acres, primarily orchard <br />land. Surface disturbances have been limited to the colluvial deposit, <br />with no surFace disturbance in the present Flood plain. No further <br />surface disturbance 1s proposed. <br />The application describes the unconsolidated deposit as being composed of <br />colluvial material resulting from mass wasting and slope wash from the <br />steep slopes rising to the north of the permit area (see Map 11). The <br />text indicates that, since settlement in the early 1900's, the area was <br />graded to allow construction of the Fire Mountain Canal and accommodate. <br />flood irrigation. <br />