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2018-10-16_PERMIT FILE - M2018039 (2)
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2018-10-16_PERMIT FILE - M2018039 (2)
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Last modified
1/4/2025 6:14:19 AM
Creation date
10/16/2018 1:47:02 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2018039
IBM Index Class Name
PERMIT FILE
Doc Date
10/16/2018
Doc Name
Adequacy Review Response
From
Blue Earth Solutions
To
DRMS
Email Name
JLE
Media Type
D
Archive
No
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The description of the material suggests that the bedrock behaves as an aquitard (low permeable <br /> barrier) for the overlying alluvial aquifer. <br /> Table 1 <br /> Summary of August 1975 Bore Hole Data <br /> Approximate Overburden Approximate Approximate Saturated <br /> Bore Ground Surface Thickness Groundwater Bedrock Thickness <br /> Elevation Elevation Elevation <br /> Hole (feet amsl) (feet) (feet amsl) (feet amsl) (feet) <br /> No.1 5017 1 5011 5001 10 <br /> No.4 5017 4 5011 4993 18 <br /> No.5 5010 1 5001 4987 14 <br /> No.7 5016 3 5013 4998 15 <br /> No.8 5008 4 5005 4990 15 <br /> No.9 4998 4 4994 4977 17 <br /> Average 2.8 14.8 <br /> (1) Exploration holes within Lamb Lakes proposed permit area <br /> (2) Ground surface elevations estimated from Google Earth and post-mining topography <br /> (3) amsl=above mean sea level <br /> 2.3 Alluvial Aquifer Characterization <br /> The exploration borings and other available information were used to construct a conceptual <br /> hydrogeologic model of the site prior to the historic mining operations. For the purpose of <br /> characterizing the hydrogeologic conditions for the site, the subsurface materials can be <br /> subdivided into three units: a clay/sandy clay overburden, permeable unconsolidated sand and <br /> gravel, and low permeability bedrock. Bedrock is covered by alluvium throughout the property. <br /> In general, the thickness of the alluvium ranges from approximately 14 to 22 feet across the <br /> project site. Local fine-grained clay or silty clay zones occurring as laterally continuous beds <br /> within the alluvium are not apparent in the available exploration borings. Therefore, the <br /> subsurface information suggests that the alluvium can conceptually be considered one aquifer. <br /> Unfortunately, data from the exploration borings or other available published reports does not <br /> provide specific information regarding seasonal or annual groundwater elevation fluctuations. <br /> Consistent with typical alluvial systems along the Colorado Front Range, it is likely that <br /> groundwater on the property is consistently at its lowest elevation during winter months. During <br /> the spring and summer months, possibly in response to recharge from high river runoff flows and <br /> agricultural irrigation, groundwater elevations would be expected to rise across the property to <br /> their highest elevations. <br /> Groundwater elevations and average estimates of the alluvial saturated thickness taken from the <br /> site exploration data (Empire 1975) are consistent with values obtained from published data for <br /> the Cache la Poudre River (Robson 2000). Reference material (Robson 2000) suggests that the <br /> alluvial groundwater elevation across the site should be about 5000 feet above mean sea <br /> level (amsl) with annual and seasonal fluctuations of several feet and a saturated thickness of less <br /> ("blue earth Page 4 of 12 <br /> SOLU1,ONS <br />
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