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The spring/seep locations and monitoring wells are used to evaluate the occurrence of ground water, hydraulic characteristics of ground water aquifers, and fluctuations in the elevation and quality of ground water. The surface water monitoring sites axe used to evaluate fluctuations in the quality and quantity of surface water. The locations of the monitoring stations are shown on the Ground Water and Surface Water Hydrology Maps, (Maps 2.04-MS and 2.04-M6). Tables 2.04.7-T2, Ground Water Monitoring Summary, and 2.04.7-T5, Surface Water Monitoring Summary, summarize the type and location of historic monitoring sites. The following summarizes the frequency of ongoing operational monitoring, as approved by DMG: • Springs and Seeps -Discharge measurements and field water quality parameters axe collected twice during the period June through October if sites are accessible. • Stream Stations -Flow and field water quality parameters are measured on a monthly basis from April through October if sites axe accessible. Water samples are collected (if flowing) fox laboratory analysis once during the 2^d and 3rd quarters. The exception is monitoring Fox the North Fork stations (NF-land 3), which continues on a year-round basis, including collection of water samples during 4~ quarter. BC-2 and BC-3 sites are only monitored fox flow and Feld parameters twice during June after tributary flow has ended. • Monitoring Wells -Ground water level measurements, field water quality parameters, and laboratory samples were taken following well installation and development and water levels and Feld parameters are measured twice during the period June through October if sites are accessible. If ground water is present, a sample is collected for laboratory analysis during the 3~d quarter. The water quality monitoring parameters list is presented in Table 2.04.7-T1, Surface and Ground Water Monitoring Parameters. All water monitoring analysis results will be recorded, reviewed to identify potential problems ox trends, and filed at the mine so as to be available for future inspection and review. In addition at the end of each water year, OMLLC will tabulate all water monitoring data for the year, review the data with respect to changes in surface and groundwater hydrology systems, and provide a summary Annual Hydrology Report in compliance with the DMG schedule. OMLLC will continue to collect and evaluate hydrologic monitoring data consistent with the I-Iydrologic Ivfonitoxing Plan during the operations and xedamation phases. If the additional data resulting from ongoing hydrologic monitoring indicates that any significant changes in general baseline characterizations are appropriate or that any assumptions ox projections used to evaluate potential hydrologic impacts are inaccurate, they will be reviewed with consideration of all available data. If the analysis of any surface water or ground water sample indicates noncompliance with applicable permit conditions, then OMLLC shall promptly notify the DMG and immediately implement accelerated ox expanded monitoring to determine the nature and extent of noncompliance and results of noncompliance. OMLLC will continue surface and ground water monitoring activities after completion of reclamation operations to document restoration of pre-mining hydrologic characteristics. All surface and groundwater monitoring installations and associated structures and equipment will be properly installed, maintained, and operated to assure the accuracy and consistency of monitoring data. Surface water monitoring will be discontinued when untreated surface runoff meets applicable effluent limitations and the DMG approves removal of drainage and sediment control structures. Groundwater monitoring wells will be abandoned and removed in accordance with applicable DMG guidelines and pemut commitments following DMG approval to discontinue groundwater monitoring. TR-45 2 Rev. Feb 2004