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cobalt, lithium and vanadium are not available for PECOCO; however, Peabody conducted • <br />beryllium, cobal t, lithium and vanadium analyses on ground water samples from five Seneca <br />II wells (incl uding spoils welt CW-527) in 1987 and found that, in all cases, <br />concentrations for these elements were less than agricultural standard maximum <br />concentrations (see 1988 VVa ter Year Seneca li Pli ne Annual Hydrology Report). In <br />conclusion, the water quality of PECOCO is acc eptable for lives±ock/wildlife use, and <br />discharges from the impoundment will not degrade downstream water quality. <br />Loa ter level and discharge measurements have heen conducted at PECOCO since June 15, 1988 <br />(Table 7-5G-1cI. Water levels were determined using a stake with a surveyed reference <br />level, and discharge was measured using a container of known volume and a stop watch. <br />Water level elevations ranged from 6774.27 ft. to 6774.61 ft. for the period of record, <br />which is a 0.34 ft. change in water level, Using the design storage capacity da to far <br />PECOCO (Table 7-5G-1d) and a multiplicative regression model, a 0.34 ft. change in water <br />level represents a change in storage volume of less than 1.0 ac.-ft. (only 4 percent of <br />the available volume). Therefore, the water level of PECOCO is quite stable and will <br />support livestock/wildlife use. <br />P ECOCO discharges into Little Grassy Creek, a tributary of Crassy Creek. Two irrigation <br />water rights are on record for Crassy Creek: Nof stger Ditch (appropriated May 27, 1908; <br />adjudicated Juty 24, 1939) and Cook Ditch (appropriated September 1, 1901; adjudicated <br />September 19, 1904). PECOCO will not affect the quality or quantity of rva ter available to <br />these water right holders because: <br />1. discharges from the impoundment meet agricultural quality standards, <br />2, the diversion points for both water rights are above the confluence of Little <br />Crassy Creek with Grassy Creek, and <br />3. both water rights have been inactive (i.e., no beneficial use) for at least 20 <br />years (Tom Williamson, personal communication, 1989). <br />In summary, hydrologic criteria for [he authorization of permanent impvur.dments under <br />Section 4,05.9 are met at PECOCO, Peabody will tontinur, to monitor +~a ter levels and water <br />quality a[ PECOCO in conj unc t.i on with routine hydrologic monitoring at '.he Seneca II :dine <br />to further substantiate the conclusions stated above. <br />L_J <br />-5q-4 <br />