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Kerr Coal - 2004 Annual Hydrology Report February, 2005 2.0 MONITORING AND ANALYSES Water monitoring activities during the 2004 water yeas (Oct. 2003 through Sept. 2004} were generally based on the revised hydrologic monitoring schedule as approved in Technical Revision No. 19 (I'R-19), Table 61 (revised August 1999). TR-19 included a proposal to reduce monitoring activities. In response letters dated January 20, 1999 and October 1, 1999, the State of Colorado Division of Minerals and Geology (DMG) accepted the following modifications to that monitoring schedule: Surface water sites 300, 306, 314, 316, 317, 318, 322, and 327, and ground water sites AP-3 and AP-4 at the loadout, have been dropped from monitoring. Monitoring of the ground water wells in the Sudduth Coal Seam {79-61) and the overburden (79-1, 79-2, and 79-3) is not required until the last two years preceding final bond release (2005 water yeaz). With the exception of deferred sampling of monitoring wells AP-1 and AP-2 in May rather than April (due to frozen conditions) sampling during the 2004 water year occurred on schedule as listed below. All field data and sample co]lection for the 2004 water yeaz was conducted under the direction of James Mossman of Kerr Coal Company. All sample analyses were performed by ACZ Laboratories, Inc. of Steamboat Springs, Colorado. • Quartedy Monitoring - AO-2A, SP-Ol, AP-1 and AP-2 (3 events) • Annual Monitoring - 79-1, 79-2, 79-3, and 79-61 {deferred) This report discusses the groundwater and surface water monitoring activities and summarizes the data collected during the 2004 water year in the following sections: • Section 3.0 -Mine Area Groundwater (Water Tablet • Section 4.0 - MineAreaAlluoial Groundwater • Section 5.0 - L.aadout Area Alluvial Groundwater • Section 6.0 -Mine Area Surface Water • Section 7.0 - I~adoutArea Surfacr Water • Section 8.0 - Wellln+pection • Section 9.0 -Future Monitoring Field and laboratory data are included in Appendices A through D. Locations of the monitoring stations and wells aze shown on Map 1, Mine Area Manitorzng Stationr, and Map 2, LoadoutArea Monitoring Stationr.