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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 44 <br />4.0 GROUNDWATER MONITORING NETWORK <br />The MCC WEM groundwater monitoring network currently consists of 28 monitoring wells. The <br />locations of these monitoring wells, relative to the mined area, are shown on Map 1. A summary <br />of the groundwater monitoring program details and monitoring well characteristics is presented <br />in Tables 3 and 4, respectively. As a whole, water level/yield data from the WEM groundwater <br />monitoring network indicate that is very little bedrock groundwater, and that there are no viable <br />aquifers in the WEM Permit Area (Map 1). <br />Groundwater field water quality data (temperature, EC, and pH) are to be collected three times <br />per year, corresponding to the rising limb, peak flow, and low flow sampling rounds. A water <br />quality sample is to be collected for analysis by a certified laboratory one time per year in the <br />low flow sampling round. Routing monitoring (i.e., for monitoring sites with more than five <br />years of water quality data) lab parameters include TSS, TDS, EC, pH, and Fe (dissolved & <br />total). <br />A total of fourteen wells have compromised, blocked or damaged casing as discussed below and <br />are no longer functional. Damaged wells recommended for removal from the groundwater <br />monitoring network and abandonment are highlighted in yellow in Tables 3 and 4. <br />August 2016 HydroGeo, Inc. <br />