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and then semi-annual for water quality (with exceptions of 008-AV-1, which requires no water quality testing, • and the Jones Well which requires quarterly sulfate testing and annual water quality). The specific sampling schedule for all of the ground water monitoring wells is described within Table A, Hydrologic Monitoring Sites, while Table B, Hydrologic Monitoring Parameter List, describes the constituents to be analyzed. When the water level measurements are obtained in the alluvial wells, the water level of the adjacent stream will also be determined using a staff gauge or other similar measuring device, except when snow and ice conditions preclude these measurements. The staff gauges have been and will continue to be surveyed following installation to ensure an accurate assessment of the stream elevation. The surveying will be done on a three-year interval, beginning in the year 2000, unless physical damage to the gauge occurs prior to that time. Each active staff gauge will be surveyed according to this schedule. Typically, the surveying will de done in the spring or eazly summer, unless field conditions precludes this work. During the late fall and winter months, snow and ice buildup on [he stream or measuring device preclude an accurate assessment of the stream elevation. For this reason, stream water levels are generally obtained from late March/early April through September. The water level measurement sites are listed on Table A, Hydrologic Monitoring Sites. For all wells, water levels will be measured using a standard level probe or pressure gauge before pumping or bailing of the monitoring well or allowing it to flow for period of time. Measurements will be made relative to a consistent datum, such as the top of the well casing. Pumping or bailing of the wells prior to water quality sampling will be done to ensure that water standing in the well bore is removed; thus, representative field readings and water quality samples can be obtained. • Surface Water, Effluent, and Spring Monitoring Monitoring Requirements. Surface water monitoring will document the quantity and quality of azea stream flows, the discharge from sedimentation control ponds, mine water discharge, and the quantity and quality of springs. Monitoring sites and sampling frequencies are set forth in Table A, Hydrologic Monitoring Sites, and in NPDES Pemmts CO-0027154, CO-0036684, and CO-0042161. Site locations are shown on Map 13A, Hydrologic Monitoring Plan. Table A specifies two general categories of sampling frequency, "Regulaz" monitoring that is done continuously, and "Contingent" monitoring that is done only when there is a discharge from underground mine pumping. The precise timing of all sampling may vary somewhat from Table A due to weather conditions. NPDES Permits. Copies of the NPDES permits are located in the mining and reclamation permit in Exhibit 30 (Volume III), Exhibit 10 (Volume VIII), and in Exhibit 44 (Volume IlIA). Data from the NPDES dischazge points will be included with the Annual Hydrologic Report. Copies of the Discharge Monitoring Report are also forwarded to DMG. The NPDES permits establish effluent limitations for discharges from the following three parts of the [nine: a) Permit CO-0027154 -Discharge associated with Ponds B, C, D, E, F and T; b) Permit CO-0036684 -Discharge from Pond E at the Fish Creek Tipple; and c) Permit CO-0042161 -Mine water discharge at the Fish Creek Dewatering Faciliq~. USGS Stream Monitoring Stations. The USGS has established continuous stream-flow monitoring stations along Foidel Creek. The operation and maintenance of the USGS stations are planned to continue throughout the life of the mine. TCC may take over these stations in the future depending upon status of agreement with USGS. • PR 04-06 Exhibit [4 - 2 5/03/04