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West Elk Mine 2003 Annual Hydrology Report <br />• Figure 2b: Stream Flow Data for the Minnesota Creek <br /> Minnesota Creek <br /> 100 <br />.-. 80 <br /> <br /> 60 ~-Average Flow WYs <br />0 1937-47,1986-2002 <br />c <br />E <br />40 <br />~--Average Flow WY <br />m <br />2003 <br />W 20 <br /> 0 <br /> ~~` <br />~ <br />Ja <br />Ja` <br />a`Gr Pec\ ~a~ ~JCe ,J\ <br />~Jy <br />~~` <br /> e <br />~ <br />Jac <br />~ ~ <br />~ <br />O°~ o~ <br />z~ F <br />~ QJ <br />~~ <br />yQ <br /> p y <br />3.0 HYDROLOGIC MONITORING <br />• The hydrologic monitoring system for the Project includes surface water, springs and seeps, ground <br />water, underdrain, and mine water monitoring sites. Routine monitoring includes field water <br />quality (pH, electrical conductivity (EC), and temperature) and flow or water level measurements <br />collected 3 times per year and a laboratory sample collected annually. The three monitoring <br />periods include the rising limb period between April 3`d and May 13`s, peak flow period between <br />April 21~` and June 26`", and the low flow period between July l0a' and October 8a'. A special <br />baseline monitoring schedule is followed for approximately one year for new monitoring sites. The <br />baseline schedule includes monthly field water quality and flow or water level measurements April <br />through October. Lab samples are collected April, June, and September. A summary of the <br />monitoring frequencies is presented in Table 1. <br />\J <br />6 <br />September 2004 HydroGeo, Inc. <br />