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• SEDIMENT POND NO.008 PERMANENT IMPOUNDMENT DEMONSTRATION In conjunction with Technical Revision 37, SCC has applied for approval of Sediment Pond 008 as a permanent impoundment to support the post [Wining land use of livestock grazing and wildlife habitat Under applicable provisions of Rule 4.05.9(]3), Sediment Pond 008 must meet the following criteria: (a) The quality of the impounded water shall be suitable on a permanent basis for its intended use, shall meet applicable state and federal water quality standazds and discharge of water from the impoundment shall meet applicable State and Federal effluent ]imitations and shall not degrade the quality of receiving water below applicable stream standazds; (b) The level of water shall be suffidendy stable, and the configuration of the pond shall be adequate, to support the intended use; (c) Adequate safety and access to impounded water shall be provided for proposed water users; (d) Water impotmdments shall not result in the diminution of the quality or quantity of water available to water right holders for agricultural, industrial, recreational, or domestic uses except in accordance with applicable state law; (e) The size of the impoundment shall be adequate for its intended purposes; • (f) The impoundment shall be suitable fox the approved post-mining ]and use. Detailed discussions and relevant information is presented in various sections of Tab 7, Hydrology. The following is a stunmary of the details contained in Tab 7. Rule 4.05.9(13)(a). Pond 008 discharges to Bond Creek, which is tributary to Fish Creek. CDPHE has detennnted that beneficial uses include aquatic life and agricultural uses. Consequently, impoundment effluent has been compazed to aquatic life and agricultural standazds. Table 7-117, Comparison of Pond 004 and 008 Effluent Quality to Yampa Segment 14B Standazds, summarizes Pond 008 effluent exceedences of the stream standards from 1999 to 2004. Table 7-I17 indicates that the effluent quality from Pond 008 is suitable to support aquatic life and agricultural uses and will not impact water quality in Fish Creek. (See -Seneca 11 Technical Retdrion 37 (2005) Permanent Impoundment Water,Quality and Water Rsght Demonrtrationr, page 7-385) Rule 4.05,9(]3)(6). Pond 008 is generally oval shaped. This configuration is typical of stock water impoundments throughout northwest Colorado. The pond receives perennial inflow from seeps and springs, as well as snowmelt runoff during spring months. The pond is fitted with a principal spillway that controls the permanent pool elevation. (Exhibit 7-17E, Pond 008 Principal Spillway Replacement As-BuikJ Rule 4.05,9(13)(c). The pond has relatively shallow inslopes (3H:1V or shallower). There aze no cliffs or steep dropoffs along any pond margin. (Exhibit 7-17E, Pond 008 Principal Spillway Replacement • Ar-Builtf TR-37 1 Ol/06