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West Elk Mine 2001 Annual Hydrology Report • 3.0 HYDROLOGIC MONITORING The hydrologic monitoring system for the Project includes surface water, springs and seeps, ground water, underdrain, and mine water monitoring sites. Roufine monitoring includes field water quality (pH, electrical conductivity (EC) and temperature) and flow or water level measurements collected 3 Umes per year and a laboratory sample collected annually. The three monitoring periods include the rising limb period between April 3'u and May 13`s, peak flow period between Apri] 21s` and June 26`", and the low flow period between July 10's and October 8'". A special baseline monitoring schedule is followed for approximately one year for new monitoring sites. The baseline schedule includes monthly field water quality and flow or water level measurements April through October. Lab samples are collected April, June, and September. A summary of the monitoring frequencies is presented in Table 1. Table 1 Monitoring Frequencies Re ular Monitorin Baseline Monltorin Month Flow Field Parameters Chemical Anal sis Januaz February March Rising Limb • Apr 3 to May 13 April Peak Flow -Apr 21 to June 26 Ma Low Flow -Jul 10 to Oct 8 June Jul August Se tember October November December 3.1 Surface Water Monitoring The surface water monitoring system for the Project includes 17 stream stations, including 10 continuous recording sites and 7 sites with instantaneous flow measuring devices. The surface water monitoring system remains the same as in WY2000. The locations of the monitoring sites are shown on Map 2. A summary of the surface water monitoring is presented in Table 2. 6 Project u 00301 HydroGeo, Inc.