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SEDIMENT POND 009 <br />PERMANENT IMPOUNDMENT DEMONSTRATION <br />SCC has applied for approval of Sediment Pond 009 as a permanent impoundment to support the post <br />mining land use of livestock grazing and wildlife habitat. This application comes at the request of the <br />landowner (Bureau of Land Management) to retain the pond. Under applicable provisions of Rule <br />4.05.9(13), Sediment Pond 009 must meet the following criteria: <br />(a) The quality of the impounded water shall be suitable on a permanent basis for its intended use, <br />shall meet applicable state and federal water quality standards and discharge of water from the <br />impoundment shall meet applicable State and Federal effluent limitations and shall not degrade <br />the quality of receiving water below applicable stream standards; <br />(b) The level of water shall be sufficiently stable, and the configuration of the pond shall be <br />adequate, to support the intended use; <br />(c) Adequate safety and access to impounded water shall be provided for proposed water users; <br />(d) Water impoundments shall not result in the diminution of the quality or quantity of water <br />available to water right holders for agricultural, industrial, recreational, or domestic uses except <br />in accordance with applicable state law; <br />(e) The size of the impoundment shall be adequate for its intended purposes; <br />(f) The impoundment shall be suitable for the approved post - mining land use. <br />Detailed discussions and relevant information is presented in the PAP in various sections of Tab 7, <br />Hydrology and Tab 13, Facilities. The following is a summary of the details contained in the PAP. <br />Rule 4.05.9(13)(a). Pond 009 is located in an un -named drainage a tributary to Sage Creek. The <br />location of this pond is shown on Exhibit 20 -2, Postmining Topography Map. CDPHE has determined <br />that beneficial uses in Sage Creek include aquatic life and agricultural uses. In 2011 water quality <br />parameters from Pond 009 discharges were below CDPHE agricultural standards, indicating that these <br />waters are suitable for irrigation and livestock use. Attachment A contains a tabulation of the water <br />quality analyses that list "2011 Excursions of CDPHE Stream Standards" for the 12 month period <br />(1/01/11 to 12/31/11). <br />Rule 4.05.9(13)(h). Pond 009 was constructed in 1992. The pond is fitted with a principal spillway <br />that controls the permanent pool elevation. Total freeboard (invert of principal spillway to top of <br />embankment) = 6.9 feet. Freeboard (invert of principal spillway to invert of emergency spillway) _ <br />3.2 feet. Freeboard (invert emergency spillway to top of embankment) = 3.7 feet. In 2011 water <br />capacity was surveyed and calculated, the water storage capacity was measured at 6.6 ac ft (top of <br />sediment to invert of principal spillway). Additional details are contained in the PAP in Tab 13, and <br />on Exhibit 13 -7A, Sedimentation Pond 009 As- Built. <br />Pond 009 is generally D shaped. This configuration is typical of stock water impoundments <br />throughout northwest Colorado. Pond 009, as currently configured, is adequate to support its intended <br />future use as a Livestock Watering Tank. <br />TR -77 1 06/12 <br />