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r PRELIMINARY ADEgUA CY REVIEW Animas Aggregates - "Thomas Pit" September 10, 1981 112 Permit Amendment Application /Exhibit C, Rule 2.12(3), Maps of Affected, Lands Exhibit C must be amended~o show all welt's in the affected area an~9 the adjacent property ownership bounda es. Exhibit D, Rule 2.12(9), Mining Plan The presently approved mining plan on file with the Division indicates that sand and gravel are to be excavated both from the dredge hole and from rile river channel. However, the presently approved permit boundary excludes the river channel from the permitted area. Amore det/~ed plan (narrative and maps) will be necessary to more clearly depict the natuYe and ext~it of the proposed opera- tions within the river channel. The phasing of the operation must Y~e described in enough der to delineate the size of the area to be mined at~.y given time - ~~ and the,~equende in which these sub-areas will be mined. The nat~z'e, dep~trh, and thickness of the alluvial gravels being mined must b.' descr'7,hy~~d (this information may be marked "CONFIDENTIAL", as per Rule 1.33) and the depth to which these deposits will be excavated roust be specified. ~/ Exhibit E, Rule 2.12(5), Reclamation Plan A more complete discussion of the proposed reclamation plans is required. A description of the size and location (illustrate on Exhibit F) of areas to be re vegetated must be included in the application: The grading proposed for the various excavations do not meet the requirements of Rule 6.1 that where a lake or pond will be created, the slopes must be reduced to 3R :1V from five (5) feet above to ten (10) feet below the expected water Ievel. The extent to which the nutritive and regenerative properties of the available topsoil resources are being protected is not clear in the application. A discussion of this matter with regard to the proposed revegetation of the site is required. Exhibit G, Rule 2.12(7), Water Resources The application does not adequately discuss the potential effects of the proposed operations on the prevailing hydrologic balance. The proposed operations would alter the river channel geometry (which can result in major shifts in the river configuration downstream and might involve flooding private lands) and contribute additional suspended sediments to the river flow (which could alter channel geo- metry downstream, clog or interfere with irrigation or other facilities down- stream, and/or have a negative impact on aquatic and riparian wildlife habitats downstream).