Laserfiche WebLink
• Slooe Protection. With the exception of the highwall azea 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 thesieepestareas around the <br />impoundment. A cover crop of barley was applied to all reclaimed azeas 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 azea. The reclaimed azea 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, temediation action will be taken. Any excessive rill and gully activity will be <br />mitigated through implementation of the till and gully plan. <br />H olo .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 standazds 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(1)(6)]; 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(1)(d}). SCC understands that the <br />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 ofout-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 />la. It should be noted that water quality data for PECOCO is referred to as "Spoils Spring #5" in <br />Peabod}~s computer database. For water quality monitoring purposes, the terms "PECOCOC" and <br />"Spoils Spring #5" aze synonymous. <br />A comparison of PECOCO water quality data with Colorado agricultural water quality standards <br />(which include standazds for livestock/wildlife water, the intended use of PECOCO) shows that the <br />maximum parameter concentrations measured at PECOCO aze always less than the agricultural <br />standards (Table 7-6G-16}. Concentration levels for beryllium, <br />• <br />TR-37 7-6g-3 Revised 08/06 <br />