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• y <br />• (Page 2) • <br />MINE ID # OR PROSP TING ID # M-aOOI-(ffp <br />INSPECTION DATE // ~ c <br />INSPECTOR'S INITIALS TAS <br />1. A pre-operation inspection was conducted of the proposed Riverview Resources Site. <br />The Riverview Resource Site is located several miles southeast of Steamboat Springs, west <br />of U.S. Highway 40 and east of State Highway 131. Present during the inspection was Gary <br />Tuttle of Western Mobile Northern and Pam Acre of the Applegate Group. <br />2. A regular 112 application has been submitted by Western Mobile Northern, Inc. for a total <br />of 105.41 acres. The applicant has proposed a dewatering and dry mining operation. <br />Mining disturbances will be reclaimed to general agriculture with a 64 acre unlined, <br />groundwater lake. <br />3. This inspector verified that the applicant is in compliance with all sign and public <br />notice procedures. <br />4. Adequacy concerns were discussed. Also, permanent man-made structures as noted on the <br />pre-mining and mining plan map were verified. No additional on-site structures were <br />noted. Cattail wetlands were noted as well as riparian areas with willows and/or sedges. <br />5. There was some discussion about relocating portions of either the Weiskopf Ditch or the <br />Supple Ditch. The applicant was advised that in the event either ditch is to be <br />relocated, the following information will be required prior to the relocation: a) a <br />written letter from the owner(s) of the ditch granting permission for such relocation and <br />any terms associated with the relocation, b) a cross-sectional diagram depicting the <br />current, undisturbed configuration and capacity of the ditch, c) a plan view map showing <br />the alignment of the ditch following relocation, and d) a commitment to install the <br />relocated ditch in a stable condition that is equal to or greater than the existing flow <br />capacity. This inspector notes that the Weiskopf Ditch contained a rock lined or cobble <br />bottom, and stable banks with a vegetative cover of grasses and riparian shrubs. The <br />Weiskopf Ditch was dry and the bottom width was approximately 3-4 feet. The Supple Ditch <br />was approximately 2' x 2' square configuration within a raised embankment. The embankment <br />contained a heavy riparian/wetland grass cover. The Supple Ditch was flowing at <br />approximately 10-20~ of capacity at the time of inspection. <br />6. There was some discussion about pit dewatering flows being discharged into either the <br />Weiskopf Ditch or the Supple Ditch. The applicant was advised to clarify the following <br />information prior to the December 11, 2001 decision date: total capacity of each ditch, <br />available capacity of each ditch at varying seasons throughout the dewatering operation, <br />maximum pit inflow expected during excavation, and discharge rates needed to maintain a <br />desired water balance during mining. The applicant agreed that discharge to either ditch <br />will be done in a manner to avoid flooding or excessive erosion. In summary, each ditch <br />has been designed and constructed to convey a maximum volume of water flowing at a maximum <br />permissable velocity. If either of these parameters are exceeded due to dewatering <br />operations there is likely to be flooding or excessive erosion. The applicant will need <br />to verify that their proposed dewatering operations will not cause an exceedance of either <br />parameter. <br />