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Site B-1 • Site H-1 Site NF-1 Site NF-2 Site NF-3 USGS Gage bower Bear Creek Lower Hubbazd Creek North Fork above Sanborn Creek North Fork below Sanbom Creek North Fork at Fire Mountain Headgate North Fork upstream of Somerset The spring/seep locations and monitoring wells aze used to evaluate the occurrrnce of ground water, hydraulic chazacteristics of ground water aquifers, and fluctuations in the elevation and quality of ground water. The surface water monitoring sites aze used to evaluate fluctuations in the quality and quantity of surface water. The locations of the monitoring stations aze shown on the Ground Water and Surface Water Hydrology Maps, (Maps 2.04M5 and 2.04MG). 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 pazameters aze collected twice doting the period June through October if sites aze accessible. • Stream Stations -Flow and Geld water quality pazameters aze measured on a mont}ily basis from April through October if sites aze accessible. Water samples aze collected (if flowing) for laboratory analysis once during the 2^d and 3~ quarters. The exception is monitoring for the North Fork stations (NF-1,2,3), which continues on a year-round basis, including collection of water samples during 4~^ quarter. • • Mordtoring Wells -Ground water level measurements, field water quality parameters, and laboratory samples were taken following well installation and development and water levels and field parameters aze measured twice dozing the period June through October if sites are accessible. If ground water is present, a sample is collected For laboratory analysis during 3~ quarter. The water quality monitoring parameters list is presented in Table 2.04.7-T7, Surface and Ground Water Monitoring Parameters. All water monitoring analysis results will be recorded, reviewed to identify potential problems or trends, and filed at the mine so as to be available for future inspection and review. ]n addition at the end of each water yeaz, OM] will tabulate all water monitoring data for the yeaz, 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. OMI will continue to collect and evaluate hydrologic monitoring data consistent with the Hydrologic Monitoring Plan during the operations and reclamation phases. If the additional data resulting from ongoing hydrologic monitoring indicates that any significant changes in general baseline chazacterizations aze appropriate or that any assumptions or projections used to evaluate potential hydrologic impacts aze inaccurate, they will be reviewed with consideration of all available data. ]f the analysis of any surface water or ground water sample indicates noncompliance with applicable permit conditions, then OMI shall promptly notify the DMG and immediately implement accelerated or expanded monitoring to determine the nature and extent of noncompliance and results of noncompliance. OMI will continue surface and ground water monitoring activities after completion of reclamation operations to document restorarion of pre-mining hydrologic characteristics. All surface and • groundwater monitoring installations and assoaated structures and equipment will be properly installed, maintained, and operated to assure the accuracy and consistency of monirortng 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 Z Revised January 2002