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4�4 Slooe Protection. With tl.e exception of the highwall area along the southwestern edge of the <br />impoundment, side slopes are 2:1 or flatter and have been permanently revegetated and protected <br />against erosion. Seeding was conducted on contour in all but the steepest areas around the <br />impoundment. A cover crop of barley was applied to all reclaimed areas to aid in site stabilization. <br />The Wadge Impoundment (Pond 002), downstream and in series with PECOCO, provides sediment <br />control for the PECOCO affected area. The reclaimed area will be included in the revegetation <br />monitoring program and the Seneca Mine Rill and Gully Plan. Where vegetation establishment has <br />not been successful, remediation action will be taken. Any excessive rill and gully activity will be <br />mitigated through implementation of the rill and gully plan. <br />Hydrology. Three hydrologic concerns must be addressed before a permanent impoundment may be <br />authorized under Section 4.05.9. Concerns are: <br />1. The quality of the impounded water shall be suitable on a permanent basis for its intended <br />use, and discharge of water from the impoundment shall not degrade the quality of receiving <br />waters to less than the water - quality standards established pursuant to applicable State and <br />Federal laws [Section 4.05.9(1)(a)); <br />2. The level of water shall be sufficiently stable to support the intended use [Section <br />4.05.9(i)(b)); and <br />3. Water impoundments shall not result in the diminution of the quality or quantity of water <br />available to water holders for agricultural, industrial, recreations, or domestic uses except in <br />accordance with applicable State law [Section 4.05.9(i)(d)). SCC understands that the <br />dMh Division Engineer has the authority to order the installations of low - level outlets <br />capable of releasing all storage from the structures or breech of the structure to <br />assure that senior appropriators receive the water to which they are entitled by law. <br />The landowner will be fully informed of the State Engineers authority in this regard. <br />SCC will provide a 6 -inch diesel pump at the PECOCO impoundment to allow the <br />release of out-of-priority inflows and the out -of- priority inflows that replace <br />evaporative losses, if and when required. Water will be pumped from the <br />impoundment and discharged to the existing outlet ditch that flows to Little Grassy <br />Creek. The pump will be maintained in an operable condition. <br />PECOCO contains water maintained primarily by ground water flow from upgradient resaturated <br />spoils. Water quality data has been collected at the discharge of PECOCO since late 1985 (See <br />Exhibit 7 -18); this data is listed in Addendum 1, and a statistical summary is provided in Table 7 -6G- <br />1a. It should be noted that water quality data for PECOCO is referred to as "Spoils Spring #5" in <br />Peabody's computer database. For water quality monitoring purposes, the terms "PECOCOC" and <br />"Spoils Spring #5" are synonymous. <br />A comparison of PECOCO water quality data with Colorado agricultural water quality standards <br />(which include standards for livestock /wildlife water, the intended use of PECOCO) shows that the <br />maximum parameter concentrations measured at PECOCO are always less than the agricultural <br />standards (Table 7- 6G -1b). Concentration levels for beryllium, <br />'0 <br />ZR -37 7 -6g -3 Revised 08,%06 <br />