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~ III IIIIIIIIIIIII III ~ <br />STATE OF COLORADO <br />Roy Romer, Governor <br />DEPARTMENT OFNATURALRESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Director <br />DATE: November 17, 1989 <br />T0: Carl Mount <br />FROM: J.M. Claptor~Z[~~ <br />RE: Seneca II Mine, File No. C-80-005 <br />1988 Annual Hydrology Report <br />Ground Water <br />Water levels appear to have largely fluctuated due to seasonal <br />precipitation patterns. Other changes in water levels have been <br />explained by changes of the topography, nearby sediment ponds <br />and cfianges of surface conditions, i.e. topsoil removal. <br />~l <br />Water quality values appear to reflect seasonal precipitation <br />patterns with general TDS level increases explained by the dry <br />year, Additional increases near mining activities have been in <br />expected ranges. Manganese standards are exceeded in the Little <br />Grassy-Grassy Creek and how Creek alluviums. These levels appear <br />to be natural phenomena. Wells in the Wadge Coal and the Wadge <br />underburden show high fluoride levels (exceeds agricultural levels). <br />Again these levels appear to be the result of natural conditions. <br />The Trout Creek well supplies the mine facilities. Its waters <br />have sulfate levels up to 403 mg/1, This water quality exceeds <br />drinking water standards of 250 mg/1. <br />Surrounding the Seneca II Mine site, the only wells are reported <br />to be domestic wells. The aquifiers of these wells are reported <br />to be unaffected by Peabody's mining activities at Seneca II Mine. <br />Surface Waters <br />Mining disturbances have generally transformed the ephemeral streams <br />into perennial flows. Evaporation and infiltration greatly reduce <br />these flows returning the streams to ephemeral conditions usually <br />within short distances downstream. <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />