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Probable Hydrologic Consequences New Elk Mine 14 <br />the station. Recorded discharges for the period of record range from 2.8 cfs to 522 cfs (USGS, 2011). The <br />size of the drainage above the Madrid station is approximately 505 square miles. There are diversions for <br />irrigation for about 6,000 acres upstream of the Madrid station. Recorded discharges at the Madrid station <br />range from 1.4 cfs to 14,300 cfs (USGS, 2011). The average annual discharge between 1972 and 2010 was <br />70.4 cfs and the average annual runoff was 50,970 acre -feet. The annual runoff in the Purgatoire is <br />dominated by snowmelt, with peak flows occurring in May and June. Summer and fall thunderstorms <br />generally produce smaller peaks of short duration. Average monthly discharges for USGS gauging stations <br />on the Purgatoire River are summarized in Table 7. <br />Table 7. Average Monthly Discharges at USGS Gauging Stations on the Purgatoire River <br />Near the New Elk Mine <br />YEAR <br />Dischar a cfs <br />Jan <br />Feb <br />Mar <br />Apr <br />I May <br />Jun <br />Jul <br />Aug <br />Sep <br />Oct <br />Nov <br />Dec <br />1972 <br />- -- <br />- -- <br />13.9 <br />13.6 <br />28.2 <br />34.8 <br />18.6 <br />18.9 <br />23.2 <br />9.9 <br />14.1 <br />10.9 <br />1973 <br />7.6 <br />7.6 <br />10.4 <br />74.9 <br />128.8 <br />235.6 <br />174.0 <br />60.2 <br />24.5 <br />19.5 <br />17.4 <br />14.6 <br />1974 <br />20.8 <br />19.6 <br />14.8 <br />14.6 <br />30.0 <br />36.9 <br />25.0 <br />32.9 <br />12.7 <br />15.1 <br />14.8 <br />13.5 <br />1975 <br />10.8 <br />23.9 <br />23.3 <br />25.4 <br />73.1 <br />157.7 <br />149.1 <br />44.3 <br />25.3 <br />15.3 <br />19.2 <br />18.2 <br />1976 <br />21.6 <br />14.7 <br />11.8 <br />15.4 <br />43.1 <br />80.4 <br />77.9 <br />42.0 <br />25.2 <br />21.4 <br />12.7 <br />8.5 <br />1977 <br />8.7 <br />5.8 <br />11.0 <br />19.2 <br />28.7 <br />67.1 <br />44.8 <br />59.9 <br />27.1 <br />16.5 <br />16.7 <br />12.6 <br />1978 <br />15.3 <br />11.2 <br />12.4 <br />17.6 <br />62.2 <br />185.6 <br />135.4 <br />85.9 <br />11.0 <br />11.5 <br />15.4 <br />17.1 <br />1979 <br />9.0 <br />15.0 <br />9.7 <br />14.5 <br />121.8 <br />287.3 <br />211.2 <br />178.2 <br />58.2 <br />21.9 <br />26.4 <br />24.0 <br />1980 <br />23.9 <br />26.9 <br />17.1 <br />72.0 <br />412.8 <br />412.8 <br />133.9 <br />49.3 <br />26.7 <br />17.0 <br />24.6 <br />18.1 <br />1981 <br />12.1 <br />11.0 <br />12.1 <br />12.4 <br />26.6 <br />53.1 <br />117.0 <br />342.3 <br />231.9 <br />46.3 <br />33.9 <br />30.4 <br />1982 <br />27.4 <br />22.6 <br />27.2 <br />63.3 <br />76.2 <br />178.0 <br />111.6 <br />267.0 <br />203.0 <br />78.5 <br />37.7 <br />30.3 <br />1983 <br />16.4 <br />37.2 <br />32.1 <br />121.3 <br />250.9 <br />588.6 <br />313.3 <br />166.8 <br />64.2 <br />35.1 <br />31.8 <br />40.3 <br />1984 <br />36.6 <br />33.9 <br />29.6 <br />39.3 <br />188.0 <br />195.8 <br />112.0 <br />177.6 <br />44.0 <br />45.9 <br />31.9 <br />30.8 <br />1985 <br />24.0 <br />22.2 <br />26.6 <br />77.9 <br />277.7 <br />272.5 <br />152.5 <br />78.3 <br />52.0 <br />31.9 <br />27.2 <br />19.3 <br />1986 <br />16.2 <br />18.2 <br />19.3 <br />33.1 <br />96.2 <br />284.6 <br />216.4 <br />101.4 <br />52.9 <br />40.1 <br />35.5 <br />25.4 <br />1987 <br />25.6 <br />25.4 <br />55.9 <br />203.5 <br />318.4 <br />319.7 <br />91.0 <br />93.7 <br />46.0 <br />24.1 <br />25.3 <br />22.9 <br />1988 <br />15.4 <br />19.1 <br />20.1 <br />20.2 <br />41.3 <br />88.1 <br />92.9 <br />67.8 <br />52.1 <br />31.6 <br />23.3 <br />15.3 <br />1989 <br />17.7 <br />28.1 <br />25.3 <br />35.9 <br />61.7 <br />51.4 <br />43.5 <br />40.5 <br />28.5 <br />24.1 <br />18.5 <br />17.6 <br />1990 <br />12.7 <br />14.5 <br />14.6 <br />26.1 <br />72.9 <br />90.0 <br />108.5 <br />66.7 <br />40.3 <br />42.8 <br />35.5 <br />21.1 <br />1991 <br />20.9 <br />22.5 <br />18.5 <br />31.6 <br />96.0 <br />157.0 <br />165.5 <br />284.7 <br />101.0 <br />36.8 <br />24.8 <br />27.8 <br />1992 <br />21.0 <br />18.4 <br />21.5 <br />37.3 <br />103.0 <br />226.2 <br />147.1 <br />190.7 <br />42.7 <br />20.4 <br />24.8 <br />22.2 <br />1993 <br />18.6 <br />19.6 <br />23.5 <br />66.9 <br />208.3 <br />258.3 <br />163.2 <br />123.6 <br />72.3 <br />34.9 <br />27.1 <br />19.6 <br />1994 <br />17.8 <br />16.0 <br />25.5 <br />72.9 <br />408.1 <br />353.9 <br />83.0 <br />95.1 <br />44.3 <br />31.9 <br />24.4 <br />23.2 <br />1995 <br />20.2 <br />16.6 <br />19.4 <br />31.1 <br />108.3 <br />368.2 <br />279.2 <br />100.8 <br />85.7 <br />49.2 <br />29.4 <br />19.9 <br />1996 <br />20.7 <br />20.1 <br />19.7 <br />29.6 <br />69.4 <br />47.7 <br />59.7 <br />39.5 <br />30.8 <br />22.5 <br />18.8 <br />16.8 <br />1997 <br />17.7 <br />16.1 <br />24.3 <br />42.5 <br />233.3 <br />336.0 <br />138.5 <br />156.6 <br />57.2 <br />36.5 <br />30.2 <br />31.4 <br />1998 <br />29.9 <br />23.4 <br />23.4 <br />41.5 <br />90.3 <br />81.6 <br />136.9 <br />126.3 <br />51.8 <br />41.5 <br />39.2 <br />24.0 <br />1999 <br />21.7 <br />17.0 <br />16.2 <br />55.1 <br />547.2 <br />327.0 <br />199.2 <br />204.5 <br />69.0 <br />45.2 <br />33.9 <br />27.6 <br />2000 <br />25.5 <br />23.8 <br />30.4 <br />82.3 <br />100.9 <br />73.6 <br />36.5 <br />28.4 <br />15.8 <br />22.9 <br />18.2 <br />16.3 <br />2001 <br />16.4 <br />17.6 <br />21.2 <br />24.4 <br />97.7 <br />103.0 <br />54.5 <br />58.3 <br />24.0 <br />16.4 <br />15.3 <br />11.3 <br />2002 <br />12.4 <br />14.2 <br />13.3 <br />11.0 <br />14.4 <br />9.5 <br />12.5 <br />8.1 <br />17.9 <br />16.4 <br />12.7 <br />10.3 <br />2003 <br />12.0 <br />11.3 <br />15.7 <br />24.1 <br />59.9 <br />119.9 <br />46.3 <br />51.0 <br />119.3 <br />35.5 <br />23.8 <br />18.4 <br />2004 <br />17.0 <br />18.6 <br />22.9 <br />172.1 <br />306.6 <br />146.6 <br />164.7 <br />263.7 <br />46.0 <br />35.7 <br />31.0 <br />28.5 <br />2005 <br />30.2 <br />35.1 <br />38.4 <br />141.1 <br />332.7 <br />326.4 <br />115.9 <br />104.1 <br />44.4 <br />39.5 <br />29.4 <br />22.6 <br />2006 <br />21.8 <br />21.7 <br />17.3 <br />20.8 <br />46.9 <br />38.8 <br />80.8 <br />136.9 <br />74.2 <br />73.1 <br />47.2 <br />37.5 <br />2007 <br />40.0 <br />51.9 <br />75.3 <br />103.2 <br />233.5 <br />236.5 <br />115.5 <br />145.5 <br />65.7 <br />44.5 <br />30.0 <br />26.4 <br />2008 <br />26.5 <br />30.0 <br />40.1 <br />72.6 <br />151.6 <br />203.0 <br />114.3 <br />148.4 <br />68.6 <br />44.3 <br />35.8 <br />34.0 <br />2009 <br />32.3 <br />29.1 <br />29.8 <br />50.8 <br />178.2 <br />180.5 <br />104.9 <br />35.2 <br />41.5 <br />38.3 <br />31.3 <br />28.4 <br />2010 <br />22.8 <br />19.2 <br />47.1 <br />96.4 <br />127.3 <br />188.7 <br />84.6 <br />150.2 <br />35.1 <br />- -- <br />- -- <br />- -- <br />Mean of <br />Monthly <br />20.2 <br />21.0 <br />23.9 <br />54.0 <br />150.1 <br />189.8 <br />118.8 <br />113.5 <br />55.3 <br />32.5 <br />26.0 <br />22.0 <br />Discharge <br />Note: Incomplete data sets were not used for statistical calculation. <br />Two surface water monitoring stations (PRS -1 and PRS -4) are located on the Purgatoire River near the <br />mine (Plate 3). The sites have been monitored semi - annually since 1984 and 1992, respectively. PRS -1 is <br />located on the Middle Fork of the Purgatoire River above surface facilities for the New Elk Mine. PRS -1 <br />monitors water quality and flow above significant mining activities. PRS -4 is located downstream of the <br />4164A.110421 Whetstone Associates <br />rrD cA L'_1.3.;+ Q /Al D.__ 12c A/7n1 1 <br />