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2014-06-16_HYDROLOGY - P2013002
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2014-06-16_HYDROLOGY - P2013002
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Last modified
9/5/2020 12:18:03 AM
Creation date
6/16/2014 12:33:16 PM
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Template:
DRMS Permit Index
Permit No
P2013002
IBM Index Class Name
Hydrology
Doc Date
6/16/2014
Doc Name
Ground water and surface water quality baseline study.
From
EAI
To
DRMS
Permit Index Doc Type
Hydrology Report
Email Name
TC1
Media Type
D
Archive
No
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Ms. Angela Bellantoni <br /> June 9, 2014 <br /> Page 3 <br /> • Any drainage from the mine area will flow down gradient to the Dawson monitoring points, <br /> where the drainage water will be detected at either one of the Dawson ground or surface water <br /> monitoring points. <br /> • Because there are no wells in the topographical vicinity of the actual mine excavation, it is not <br /> necessary to monitor ground water conditions in and topographically adjacent to the mine itself. <br /> • There are other mine workings in the area. The locations of the ground water monitoring points <br /> should detect the influences of the existing mine workings that drain to the monitoring points <br /> during the baseline monitoring period, such that changes resulting from the Zephyr mine can be <br /> determined independently from existing mine workings. <br /> • There is complex structural geology including major geologic faults in the vicinity of the <br /> proposed monitoring points. We do not believe that the geologic faults will impact the function of <br /> the monitoring points, because the targeted well depths are shallow and will intercept ground <br /> water and surface water draining from the mine site despite geologic structure in the drainages. <br /> There is no evidence that the faults at this location function as conduits to ground water flow. <br /> • Available borehole data indicate that there is no ground water present at the mine location. <br /> Therefore, any ground water monitoring down gradient of the mine will simply provide baseline <br /> data that can be used to detect impacts from mine surface activities and any mine drainage should <br /> it occur. <br /> • We understand that ground water monitoring is not required because the mine will not intercept <br /> ground water. Nevertheless, we have recommended one ground water monitoring point for the <br /> purposes of establishing baseline data at the Dawson location. <br /> Sqrface Water MonitoringPoints <br /> • Locations are geographically close to the mine excavation areas and intended to capture surface <br /> drainage from the mine sites. <br /> • Proposed surface water monitoring points will generally be dry, but they are strategically located <br /> to capture any surface water runoff or mine drainage that may result from the mine. <br /> • Monitoring locations will effectively monitor and detect any surface water influences that may <br /> impact downstream locations. <br /> • There are other mine workings in the area. The locations of the surface water monitoring points <br /> should detect the influences of the existing mine working during the baseline monitoring period, <br /> such that changes resulting from the Zephyr mine can be determined independently from existing <br /> mine workings. <br /> Proposed Monitoring Point Locations <br /> Based on our field observations, land use considerations, and the hydrological and geological research <br /> completed, we propose that three surface water monitoring points and one ground water monitoring point <br /> are implemented. The proposed locations are presented on Figure 2 and Table 1. We believe that the <br /> locations should be accessible for monitoring and construction (drilling) purposes, and suggest that <br /> Zephyr confirm whether or not these points are located on property owned by or accessible to Zephyr. We <br /> understand that the ground water monitoring point is not required because the mine will not intercept <br /> ground water. Nevertheless, we have recommended the ground water monitoring point to provide <br /> baseline ambient ground water data which may detect impacts at the Dawson site, where impacts to <br /> ground water have potential to occur as a result of mining activities. <br /> Two surface water monitoring points at the Dawson pad site are proposed, one intended to intercept <br /> drainage directly occurring from the mine and pad area, and another intended to intercept surface water <br /> draining from adjacent lands, some of which have active mine workings and tailings. <br />
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