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723 -01 <br />AGE <br />FORMATION NAME <br />GENERAL DESCRIPTION SYMBOL <br />APPROXIMATE <br />THICKNESS <br />IN FEET <br />3N30O3Tdd <br />POISON CANYON <br />FORMATION <br />SANDSTONE - Course to conglomeratic beds 15-50 ft thick, •?�'i .a.% <br />interbeds of yellow-weahtering, clayey sandstone Thickens gigligg <br />to west at expense of underlying Raton _ _ v <br />u: u,?; ITT; <br />500+ <br />RATA FORMATION <br />Formation intertongues with Poison Canyon Formation <br />to the west <br />COAL ZONE -Very fine grained sandstone, saftstone,� <br />and mudstone with carbonaceous shale and thick coal beds <br />BARREN SERIES-Mostly very fine to fine grained <br />sandstone with moor 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 />sandstone at base; locally absent <br />�;+ <br />,- µ'' -.. <br />ti j <br />'? <br />0? -2100 <br />— K T BOUNDARY <br />UPPER CRETACEOUS <br />FORMATION <br />SANDSTONE -Fine to medium grained, also mudstone, • <br />carbonaceous shale, and extensive, thick coal beds. Local sills ,,: <br />0 -380 <br />TRINIDAD SANDSTONE <br />SANDSTONE -Fine to medum. rained: contains y�. n ` <br />casts of Ophlomorpha g ..Y � i' <br />0 -300 <br />PIERRE SHALE <br />SHALE -Silty in upper 300 ft Grades up to fine - grained <br />sandstone Contains limestone concretions <br />1800-1900 <br />CMrn Now Elk Men Raton Born Shat Column.drp] h(3-5 -2010) <br />April 2012 Page 1 -3 <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 mi 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 />Figure 1 -1 <br />Generalized Stratigraphic Column <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 />Colorado Department of Public Health and Environment (CDPHE). DRMS programs are <br />designed to monitor past and present, and to anticipate future, effects of mining activities on the <br />