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February 2014 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 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 />Figure 1 -1 <br />Generalized Stratigraphic Column <br />fool NW Elk Dom Rulan Bola Brat 6*MR WdWd 0 -5- =0) <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 />APPROXIMATE <br />AGE <br />FORMATION NAME <br />GENERAL DESCRIPTION <br />SYMBOL <br />THIOMESS <br />IN FEET <br />POISON CANYON <br />FORMATION <br />SANDSTONE- Course to corekx redc. beds 1 &59 Rthick; <br />interbedsofyellow. weahlering ,elayey sandstone. Thickens <br />to west at expense of underlying Raton <br />600+ <br />W <br />Formation Wei tongres Willi Poison Canyon Formation <br />to tite west <br />UPPER COAL ZONE-Very One grained sarndstone, sOtstone, <br />aand <br />mudstme wOh carbonaceous shale and thick coal beds <br />RATON FORMATION <br />0?-2100 <br />BARREN SERIES-Mostly very Pore to One grained <br />sandstone wRh "Mar mtudstorte, si@ stone, <br />carbonaceous shale, and thin coal beds <br />LOIAER COAL ZONE -Same as upper coal zone; coals beds <br />mostly Otis and dlscontinuou% Conglomeratic <br />sandstone at base; locally absent <br />K T BOUNDARY <br />W <br />VERMEJO <br />FORMATION <br />SANDSTONE -Fine to medkmt grained; also rtoulstorne, <br />carbonaceous shale, and adernsive, thick coal beds. Local dis <br />0.380 <br />U <br />y <br />TRINIDAD SANDSTONE <br />SANDSTONE-Fine to medium-grai ned: cordaina <br />casts of Ophlonaphe <br />= <br />0'o <br />_ <br />n <br />PIERRE SHALE <br />SHALE -Silly in upper 300 it. Grades up to ftwWai med <br />sandstone. Contains Omnmbone concretions <br />—_ - <br />1 OD4100D <br />fool NW Elk Dom Rulan Bola Brat 6*MR WdWd 0 -5- =0) <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 />