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• <br />Hydrologic Monitoring Plan <br />Northfield Mine <br />B. Sampling Frequenter and Procedure <br />1. Asemi-annual survey of water inflow to the mime will be <br />conducted during the spring and fall of each year. <br />2. An estimate of the flow and quantity of each source will <br />be documented. <br />C. Sampling Procedure <br />1. Sampling and measuring devices will be cleaned prior to <br />and after use. <br />2. Field quality data including pH, temperature, and <br />electrical conductivity will be recorded for all significant <br />inflow sources. <br />D. Data Processing and Reporting <br />• <br />1. Locations of all inflows will be recorded on a mine <br />workings map and kept on file in the mine office. A table <br />keyed to the mine map will be prepared which depicts <br />quantity, duration, and quality of inflows. <br />1. Data will be summarized in the Annual Hydrology Report <br />submitted to the Division, as described below. <br />VI. Private Well Monitoring <br />A. Monitoring Locations <br />1. Private area wells in existence prior to coal mining, <br />identified by Bishop-Brogden Consultants and provided in <br />Table 6, will be chosen for participation in the monitoring <br />plan based on proximity to the mine operation and well <br />water source. These wells are targets since permission, <br />access, well equipment and well permit status may limit <br />Northfield's ability to monitor the specific well. <br />2. Private well permit holders will sign a release (Exhibit A) <br />allowing Northfield personnel and their designated <br />representatives to enter the property to perform <br />monitoring. Wells will be monitored only with a signed <br />release from the owner. <br />B. Monitoring Frequency <br />• <br />1. Water level measurements will be taken semi-annually at <br />6 <br />