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Octpbeir 200 Page 1 -3 I I some diversions for irrigation above the station. Recorded discharges during the three -and -a -half year pgriod ,range from 2.8 cubic feet per second (cfs) to 522 cfs (USGS, Water Resources Division 1982). The size of the drainage above the Madrid station is 505 mil. There are diveirsibns for irrigation for about 6,000 acres upstream of the Madrid station (07124200). The average annual discharge between 1972 and 2011 at Madrid was 69.5 cfs and the average annual runoff was 50,320 acre -feet (ac -ft) (USGS website). Run -off for the 2011 water year was 25,400 acre -feet (ac -ft) The annual runoff in the Purgatoire is dominated by snowmelt, with peak flows occurring ini May and June. Summer and fall thunderstorms generally produce smaller peaks of short duration. Figure 1 -1 Generalized Stratigraphic Column CbW Nee silk [[Gass Milan IlWn Met Cohn Also 6043- 6-11Dt0) 1.2 Monitoring Program Monitoring programs have been conducted since February 1984 to assess the effects of past, present, and future mining operations on the surface and on groundwater quality and quantity. These programs provide information for the operators of the facilities as well as to regulatory agencies such as the Division of Reclamation, Mining, and Safety (DRMS) and the Colorado Department of Public Health and Environment (CDPHE). DRMS programs are designed to monitor past and present, and to anticipate future, effects of mining activities on the APPROXIMATE AGE FORMATION NAME GENERAL DESCRIPTION SYMBOL THICKNESS IN FEET POISON CANYON SANDSTONE-Course to conglomeratic: beds 1650 R thick; Intedea of yalkr*weahtedng, clayey sandstone. Thickens 500+ FORMATION to wed at szpsnse of underlying Raton romrallon kdwtorkgues with Poison Canyon Formation to the west ...... LIPPER COAL ZONE -Very fine grained ssndstone, silt ans, a and mudstake wdh adlonaaous shale and Clock coal beds RATON FORMATION 02100 BARREN SERIES-Mostly very fins to fkw grained sandstone wkh mina mudstone, sillstone, carbonaceous shale, and tin cool beds LOWER COAL ZONE -Sams as upper cool zone; cools beds mostly Min and discon inuou% Conglomeratic K T BOUNDARY ssndstone at bass inert IF VERMEJO SANDSTONE -Fine M msdlum gained; also inudetorra FORMATION arbonaceous shale, and extensive, Mick coal bads. Local sill �� 0390 — u TRINIDAD SANDSTONE ads of E��a m grained: conmkks 0-300 SHALESdy in upper 800 R. Grades up to tine- grained 19004900 _ PIERRE SHALE sandstone. Corktsins Ilmestons concretions _ CbW Nee silk [[Gass Milan IlWn Met Cohn Also 6043- 6-11Dt0) 1.2 Monitoring Program Monitoring programs have been conducted since February 1984 to assess the effects of past, present, and future mining operations on the surface and on groundwater quality and quantity. These programs provide information for the operators of the facilities as well as to regulatory agencies such as the Division of Reclamation, Mining, and Safety (DRMS) and the Colorado Department of Public Health and Environment (CDPHE). DRMS programs are designed to monitor past and present, and to anticipate future, effects of mining activities on the