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• Two sets of wells at the upgradient boundary to investigate ground water conditions entering the <br /> affected area. For each set of wells, one well will be completed in the Precambrian material <br /> upgradient of mapped faulting,and one well will be completed in the sedimentary materials down <br /> gradient of mapped faulting. These wells will help define how the existing faulting impacts ground <br /> water flow and ground water conditions entering the affected area. <br /> • One well in the relative center of the affected area. This well will be completed in the sedimentary <br /> materials and will help investigate how ground water flow and quality may change as it flows <br /> through the affected area. <br /> • One well below all of the surface mine workings. This well will be completed in the sedimentary <br /> materials and will help investigate the impact of the mine workings on the ground water flow and <br /> quality. This will be the last well above the point of compliance well discussed below. <br /> This monitoring well network represents a more robust monitoring network that will provide additional <br /> data points (compared to the existing wells)to investigate ground water flows (quantity and quality) <br /> beneath the affected area. The wells will provide water level data that can be used to determine flow <br /> direction, monitor water level changes as mining progresses and investigate the impact of faulting on <br /> ground water flow as well as provide the opportunity for water quality sampling. <br /> The monitoring wells completed in the Precambrian material at the upgradient boundary of the affected <br /> area will either be constructed to the total depth of the mine or will be competed such that they can be <br /> deepened in the future such that they can be used over the life of the mining (and dewatering) <br /> operations. The monitoring wells in the sedimentary wells will be completed to a depth of 200 feet or to <br /> fully penetrate the Dakota formation,which ever depth is shallower. This sedimentary well construction <br /> will allow for the monitoring of ground water conditions in the productive sedimentary units beneath <br /> the affected area throughout the life of the mining operations. <br /> In addition,to monitor potential impacts to Grape Creek, a monitoring location has been located on <br /> Grape Creek, as presented in Figure 3. Stream gaging and water quality analyses will be performed at <br /> this location to monitoring conditions in the creek and potential impacts. <br /> 2.7.4.1 Point of Compliance Well(s) <br /> To meet the requirements of Rule 3.1.7(6), one or more down gradient wells shall be <br /> established as the location to demonstrate compliance with any condition established to protect <br /> ground water. For a new facility, such as the Zephyr Gold Mine,this includes a point of <br /> compliance at the hydrologically down gradient limit of the area below the facility potentially <br /> impacting ground water. <br /> One point of compliance well location has been identified as presented in Figure 3. <br /> This point of compliance will be sufficient to demonstrate compliance with established ground <br /> water protection conditions as ground water will move northwards out of the Precambrian <br /> material into the sedimentary material, where ground water will then flow northeast towards <br /> the Canyon City Embayment and the identified point of compliance well location. The point of <br /> compliance well will be completed in the sedimentary rock units. The presented point of <br /> compliance well location is well suited to identify ground water conditions leaving the affected <br /> area. <br /> 42 <br />