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2021-09-03_PERMIT FILE - C1981019A (8)
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2021-09-03_PERMIT FILE - C1981019A (8)
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Last modified
5/10/2023 2:22:44 PM
Creation date
4/27/2022 2:26:16 PM
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
9/3/2021
Doc Name
Permits
Section_Exhibit Name
Volume 15 Rule 2
Media Type
D
Archive
Yes
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RULE 2 PERMITS <br />Much of Little Collom Gulch is located within the Collom Pit and spoil piles. As a result, an upgradient <br />monitoring station was not established. Sampling point LLCG is located immediately adjacent to valley <br />fill well MLC -04-01 east and just above the confluence of Little Collom and Collom Gulches (Map 1013). <br />Another monitoring well named MLC -04-20 was attempted to be drilled in Little Collom Gulch to <br />monitor valley fill ground water in the upper portion of the gulch. The location selected was downstream <br />of and within 500 feet of the northern end of the Collom Pit temporary fill stockpile. The location <br />selected for the placement of the monitoring well was on a bench within the bottom of the valley that was <br />considered to be underlain by valley fill material. The bench is 25 to 30 feet above the floor of the narrow <br />incised channel of Little Collom in this area. <br />The MLC -04-02 location was sited approximately 30 feet west of the valley bottom. During the drilling <br />of the hole, weathered bedrock was encountered at approximately four feet below ground surface, with a <br />mixture of colluvium and eolian material from ground surface to four feet below ground surface. Drilling <br />was advanced to 20 feet to determine if any shallow ground water could be encountered. The drilled <br />materials to 20 feet were dry. <br />Examination of the bank wall above the floor of the Little Collom Gulch valley revealed weathered <br />bedrock near the surface and less weathered bedrock encountered when digging further into the bank. <br />The floor of the valley revealed predominantly colluvial and eolian material with some sheet wash <br />material. <br />Based on the activities at the MLC -04-02 location, further examination of the Little Collom Gulch valley <br />was undertaken from this point downstream (northward) to near the site of MLC -04-01 (near the <br />confluence with Collom Gulch). The valley bottom of the Little Collom Gulch is narrow for over 0.3 <br />miles to where the valley starts to spread out, but the channel remains narrow and deeply incised. <br />The surface material throughout the valley remains predominantly colluvial and eolian with some sheet <br />wash deposition. The banks along the deeply incised channel do not show any significant falls due to <br />undercutting of the banks. Only normal erosion seems to be occurring throughout the length of Little <br />Collom before it enters Collom Gulch. Large trees and heavy rangeland vegetation occurs through the <br />valley bottom. <br />Where the valley flattens on each side of the incised channel of Little Collom Gulch (approximately 0.9 <br />miles north from the MLC -04-02 site), a two track road has crossed the incised valley bottom of Little <br />Collom Gulch. Examination of this location shows no evidence of near surface ground water and no <br />"wetlands" type vegetation is apparent in this area. The crossing is approximately 30 to 40 feet deeper <br />than the flat area of the valley on each side of the incised channel. <br />Several impoundments in Little Collom Gulch show some water storage in the past. However, there is no <br />evidence of recent surface water flow and/or storage due to the presence of rangeland vegetation in the <br />incised channel bottom and the water storage areas. Another crossing near where Little Collom Gulch <br />turns to the west to intersect with Collom Gulch, also shows no recent water flow or wet bottom in the <br />incised channel bottom. This crossing is also approximately 30 to 40 feet deeper than the valley sides. <br />In addition to these observations, monitoring of surface and ground water in the valleys of the Collom <br />mining area has been undertaken for over a decade and no surface flow has ever been noted in Little <br />Collom. Drilling and field surveys by Colowyo geologic contract personnel in the Collom mining area <br />for over the past 20 years have not noted any water flow in Little Collom Gulch. <br />The surface conditions of Little Collom Gulch north of the MLC -04-02 location and the shallow bedrock <br />throughout the valley seems to preclude the presence of any significant valley fill north of the temporary <br />Collom — Rule 2, Page 32 Revision Date: 4/7/17 <br />Revision No.: RN -07 <br />
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