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February 2014 Page 1 -3 <br />approximately 18 miles downstream from the New Elk Mine, has been monitored since 1972. <br />The size of the drainage area above the Stonewall station is 52.1 square miles (mi2). There are <br />some diversions for irrigation above the station. Recorded discharges during the three- and -a -half <br />year period range from 2.8 cubic feet per second (cfs) to 522 cfs (USGS, Water Resources <br />Division 1982). The size of the drainage above the Madrid station is 505 mil. There are <br />diversions for irrigation for about 6,000 acres upstream of the Madrid station (07124200). The <br />average annual discharge between 1972 and 2011 at Madrid was 69.5 cfs and the average annual <br />runoff was 50,320 acre -feet (ac -ft) (USGS website). Run -off for the 2011 water year was 25,400 <br />acre -feet (ac -ft) The annual runoff in the Purgatoire is dominated by snowmelt, with peak flows <br />occurring in May and June. Summer and fall thunderstorms generally produce smaller peaks of <br />short duration. <br />Fiigtxe 1 -1 <br />Generalized Stratigraphic Column <br />OM Nw Elk [lkwn Raton B—in Strut Column.OipJ:dMr(3 --5 -2010) <br />1.2 Monitoring Program <br />Monitoring programs have been conducted since February 1984 to assess the effects of <br />past, present, and future mining operations on the surface and on groundwater quality and <br />quantity. These programs provide information for the operators of the facilities as well as to <br />regulatory agencies such as the Division of Reclamation, Mining, and Safety (DRMS) and the <br />APPROXNATE <br />AGE <br />FORMATIONNAME <br />GENERAL DESCRIPTION <br />SYMBOL <br />THICKNESS <br />IN FEET <br />POISON CANYON <br />SANDSTONE -Course to conglometatic: beds 15-50 R thick: <br />6Aerbeds of yetbx- weahtering, clayey sandstone. Thickens <br />—= <br />500+ <br />FORMATION <br />to west at expense of underlying Raton <br />w <br />~ a <br />Formation intertongues with Poison Canyon Formation <br />Z <br />to the west <br />_ <br />W <br />r <br />w <br />UPPER COAL ZONE -Very fine grained sandstone, siRstone, <br />_ <br />Q <br />CL <br />and mudstone with carbonaceous shale and thick wal beds <br />— <br />RATON FORMATION <br />0 1-2100 <br />BARREN SERIES-Mostly very fine to fine gained <br />sandstone with mina mudstone, siltstone <br />carbonaceous shale, and thin coal beds <br />LOWER COAL ZONE -Same as upper coal zone: coals beds <br />mostly thin and discontinuous, Conglomeratic <br />= <br />K T BOUNDARY <br />sandstone at base; locally absent <br />rn <br />D <br />VERMEJO <br />SANDSTONE -Fine to medium grained: also mudstone, <br />U <br />FORMATION <br />carbonaceous shale, and extensive. thick coal beds. Local sills <br />_ <br />0-380 <br />Q <br />W <br />W <br />U <br />TRINIDAD SANDSTONE <br />SANDSTONE-Fine to medium-grained. contains <br />^ <br />0 -300 <br />Of <br />w— <br />casts of Ophiamarpha <br />_ <br />SHALE -Silty in upper 300 ft. Grades up to fine - grained <br />1800 -1900 <br />a— <br />a <br />— <br />PIERRE SHALE <br />sandstone. Containskmestoneconttetions <br />— — <br />OM Nw Elk [lkwn Raton B—in Strut Column.OipJ:dMr(3 --5 -2010) <br />1.2 Monitoring Program <br />Monitoring programs have been conducted since February 1984 to assess the effects of <br />past, present, and future mining operations on the surface and on groundwater quality and <br />quantity. These programs provide information for the operators of the facilities as well as to <br />regulatory agencies such as the Division of Reclamation, Mining, and Safety (DRMS) and the <br />