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TR-34 to Permit M-1977-342 <br /> Environmental Protection Plan <br /> 9. GROUNDWATER QUALITY DATA <br /> 9.1. Local Groundwater Uses <br /> Mine: As discussed above, groundwater at the Mine is limited to a thin lens of alluvium that is <br /> bounded on all sides by low permeability, Precambrian Silver Plume Granite. Therefore, the <br /> current and future groundwater use at the site is limited to recharge of the West Fork of Clear <br /> Creek. The site hydrogeologic conditions cannot support development of groundwater resources <br /> for any other beneficial use. <br /> Mill: Current and future groundwater use at the Henderson Mill is limited. Groundwater within <br /> the Henderson Mill property boundary occurs primarily in the areas downstream of the TSF. <br /> Within these areas, current and future domestic and agricultural development of groundwater <br /> would not be likely, given the remote site location and harsh climate conditions. The primary use <br /> of groundwater at the Mill site is recharge to the Williams Fork River. <br /> 9.2. Groundwater Monitoring <br /> Groundwater monitoring is conducted on a regular basis in accordance with the GWMP. <br /> Groundwater collection and analyses procedures at the Mine and Mill sites are described in the <br /> GWMP, including sampling parameters, monitoring locations, sampling and analytical <br /> procedures, detection limits, and frequency. <br /> 9.3. Groundwater Quality Data <br /> A large database of groundwater quality data exists in the record and is on file as part of the <br /> Reclamation Permit. As discussed in this document and at more length in the GWMP, due to <br /> Henderson's geology, groundwater is forced to the surface in close proximity to Henderson <br /> operations. Surface water quality data upstream and downstream of potentially impacted <br /> groundwater indicates that Mine and Mill operations are not adversely impacting surface water <br /> quality downstream of the sites. <br /> The GWMP describes surface and groundwater monitoring and reporting of water quality data <br /> to the DRMS. The ongoing collection of this data provides a basis for the evaluation of <br /> reclamation performance standards and the adequacy of EPF design, maintenance and <br /> operation. <br /> Climax Molybdenum Company August,2021 <br /> Henderson Operations Page 33 of 45 <br />