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<br />Hydrologic Monitoring Plan <br />Northfield Mine <br />sent quarterly to the Colorado Department of Health and <br />the DRMS. <br />2. If water quality analysis results indicate a possible permit <br />violation, the Colorado Department of Health and the <br />DRMS will be notified immediately. In addition, both <br />agencies will be provided copies of the suspect analysis <br />and a report discussing any necessary mitigation <br />measures. <br />3. Data will be summarized in the Annual Hydrology Report <br />submitted to the Division, as described below. <br />IV. Mine Discharge to Sedimentation Pond Sampling <br />A. Monitoring Locations (Refer to Figure 1, Hydrology Monitoring <br />Locations) <br />1. Mine dewatering system input to Pond 1. Dewatering <br />system is potentially necessary depending on mine inflow <br />quantities. <br />g. Samglina Frequenck and Procedure <br /> <br />1. Random grab sample at discharge point on a monthly <br />basis. <br />2. Total quantity discharged into pond, on a monthly basis, <br />will be documented and kept on file at the mine office. <br />C. Sampling Procedure <br />1. Sampling and measuring devices will be cleaned prior to <br />and after use, and samples will be placed in clean sample <br />containers which will be sealed at the sampling site. <br />2. Field quality data including pH, temperature, and <br />electrical conductivity. <br />D. Data Processing and Reporting <br />1. Data will be summarized in the Annual Hydrology Report <br />submitted to the Division, as described below. <br />V. In-Mine Monitoring <br />A. Monitoring Locations <br />• <br />1. Points of measurable and sustained water inflow within <br />the active mine workings. <br />5 <br />Revised 11/5/2007 <br />