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TR -18 to Permit M- 1977 -342 <br />Environmental Protection Plan <br />clays, and silts underlain by semi- consolidated siltstones, sandstones, conglomerates and claystones. <br />Data from test pits and borings within the Troublesome indicate that the presence of groundwater <br />within this unit is highly variable. A site study conducted by Woodward -Clyde (1983) concluded <br />that this formation is not considered to be a continuous aquifer because of the limited extent of the <br />sand layers in the formation which would preclude significant groundwater flow. <br />Idaho Springs Formation and Silver Plume Granite <br />The weathered and unweathered Precambrian Idaho Springs Formation and Silver Plume Granite <br />are considered to be relatively impermeable compared to the overlying glacial, alluvial and <br />Troublesome Formation deposits. The low permeability nature of the Idaho Springs Formation and <br />the Silver Plume Granite have been documented through packer and geophysical testing in the <br />Precambrian bedrock. These data indicate that the Precambrian bedrock is not capable of <br />transmitting significant quantities of groundwater as compared to the overlying glacial and alluvial <br />deposits and show a defined decrease in hydraulic conductivity with depth. <br />The primary groundwater flow path is generally from southwest and towards the Williams Fork <br />River to the northeast. Data indicates that the direction of groundwater flow is essentially northward <br />near GW -4, and bends northeastward (towards the William Fork River) in the area of well GW -7 <br />(Hydrokinetics, 1993). <br />Climax Molybdenum Company <br />Henderson Operations <br />October, 2012 <br />Page 27 of 40 <br />