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2014-03-20_HYDROLOGY - M1977342
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2014-03-20_HYDROLOGY - M1977342
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Last modified
8/24/2016 5:41:10 PM
Creation date
3/21/2014 3:17:54 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977342
IBM Index Class Name
HYDROLOGY
Doc Date
3/20/2014
Doc Name
Groundwater quality assessment
From
Climax Molybdenum
To
DRMS
Email Name
PSH
Media Type
D
Archive
No
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March 2014 Mill MLGW -7 Groundwater Quality Assessment ♦ 3 <br />2.0 SUMMARY OF GEOLOGY AND HYDROGEOLOGY <br />2.1 SITE GEOLOGY <br />The Henderson Mill and TSF are located within the Ute Creek Basin of the Williams Fork <br />River Valley. The TSF is within a shallow sloping portion of the basin near its downstream <br />outlet. Figure 3 presents a geologic map of the TSF that is based on reconnaissance <br />mapping, pre - tailings topography, drill-hole data, and air photo interpretation. Cross - Section <br />A -A' (Figure 4) is oriented southwest to northeast from 1 -Dam through the extraction <br />wellfield, through monitor well pair MLGW -7/15, and to the Williams Fork River. <br />As shown on the geologic map and cross - section, shallow geology beneath and <br />downgradient of the TSF, including portions of 1 -Dam and 3 -Dam, is characterized by <br />Quaternary glacial drift (moraine and till deposits undivided), glacial outwash, and alluvium <br />(Qd). Pre - quaternary geologic units in the vicinity of the TSF include the Tertiary <br />Troublesome Formation (Tt) and Precambrian bedrock (Xg). A more detailed description <br />of the geology is provided in the POC Memorandum (AJAX /Clear Creek, 2013). <br />2.2 SITE HYDROGEOLOGY <br />Hydrostratigraphic units are bodies of rocks or sediments that are hydraulically continuous, <br />mappable, and can be described as distinct hydrologic systems. Water - bearing Quaternary <br />sediments, including glacial drift, glacial outwash, and recent alluvial deposits, occur in the <br />lower Ute Creek Basin and Williams Fork River Valley and comprise an aquifer system east <br />of 1 -Dam. The depth to groundwater within the aquifer is shallow, typically 10 to 30 feet <br />bgs. Aquifer thickness varies depending on the thickness of Qd. In the vicinity of 1 -Dam, <br />the aquifer thickness ranges up to 160 feet. From a hydrologic standpoint, the glacial and <br />alluvial sediments in the vicinity of 1 -Dam comprise a single shallow aquifer system. <br />Groundwater in the shallow aquifer flows beneath the dam east - northeast, towards the <br />Williams Fork River. As discussed in the POC Memorandum (AJAX /Clear Creek, 2013), <br />both the Tt and Xg were observed to be non -water bearing east of 1 -Dam. <br />AJAX Ltd ♦ 28828 Cedar Circle ♦ Evergreen, CO 80439 ♦ (303) 241 -2057 <br />Clear Creek Associates* 6155 E. Indian School Rd. ♦ Scottsdale, AZ 85251 ♦ (480) 659 -7131 <br />
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