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Groundwater Monitoring & Response Plan <br />than 1 acre of home gardens and lawns, and the watering of domestic animals. The well was <br />installed in 2005 and was completed to a total depth of 40 feet bgs. <br />The four new monitoring wells included in the proposed monitoring network will be installed at <br />the general locations shown in Figure 2. Three of the new wells (MW -1, MW -2 and MW -3) are <br />located on property owned by Dillon Ranches LLLP; the other new well (MW -4) is located on <br />private land adjacent to the Dillon Ranches LLLP property. Well MW -1 will remain in place <br />through Phases I and lI of mine operations. Prior to Phase III expansion, well MW -1 will be <br />abandoned and a new well (MW -IA) will be installed north of the projected Phase III boundary. <br />The proposed well locations shown in Figure 2 are considered approximate and may be adjusted <br />as necessary based on access and landowner approvals as well as results of the well inventory and <br />assessment. It is anticipated that each new monitoring well will be completed to an approximate <br />depth of 50 feet bgs. The top of casing of each well will be surveyed to allow water level <br />measurement to be compared on a single datum. <br />Pressure transducers equipped with data loggers will be installed in each new monitoring well; a <br />pressure transducer equipped with a data logger will also be installed in the McGarry Well if <br />feasible. The data - logging pressure transducers will provide continuous records of water levels in <br />the monitoring wells. Each transducer will be connected to a direct read cable. The direct read <br />cable will either be connected to a telemetry system for continuous, real -time, remote data access, <br />or if a telemetry system is not used, the direct read cable will periodically be connected to a <br />laptop computer for onsite data downloading. If a pressure transducer cannot be used in the <br />McGarry Well, water levels in the well will be periodically measured with a hand -held water <br />level indicator. Periodic measurements with hand -held water level indicators will also be taken in <br />each well equipped with a pressure transducer to supplement and verify the continuous data <br />record. <br />In addition to monitoring groundwater levels, two staff gages will be installed on the bank of the <br />Animas River, one upstream and one downstream of the site. Both gages will be installed on <br />property owned by Dillon Ranches LLLP. Measurements will be manually recorded during the <br />pre - dewatering, active dewatering, and post - dewatering monitoring periods at the general <br />locations shown in Figure 2. <br />Western Water & Land, Inc. 4 <br />