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2020-06-25_REVISION - C1981019 (6)
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2020-06-25_REVISION - C1981019 (6)
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Last modified
1/8/2025 2:43:03 AM
Creation date
6/25/2020 10:51:12 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
Revision
Doc Date
6/25/2020
Doc Name
Proposed Revision Materials
From
Colowyo Coal Company, LP
To
DRMS
Type & Sequence
MR220
Email Name
ZTT
JDM
Media Type
D
Archive
No
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RULE 2 PERMITS <br /> qualify as an alluvial valley floor. However, mining will in no way adversely affect the ability to irrigate <br /> or farm any agriculture or potential agriculture area, including this area. <br /> Water Quality and Quantity <br /> Since 1974, Colowyo and other private and governmental groups (VTN, BLM, and USGS)have collected <br /> samples of water flows and water quality. The results of all this work is summarized in section 2.04.7. <br /> Aerial Photograph Analysis <br /> Aerial photographic coverage of the permit area and adjacent area has been complied by the OSM in <br /> Denver, Colorado. The photographs are infrared and show the late summer and fall season differences in <br /> vegetative growth between upland and valley floor areas. Good Spring Creek appears in the aerial <br /> photographs to possibly be an alluvial valley floor. <br /> Effects on Essential Hydrologic Functions <br /> Based on information accumulated, the effects of mining on any alluvial valley floor which exist in the <br /> general area would be minimal. Because of the undefined perched existences and limited amounts of <br /> bedrock groundwater in the area to be mined, the planned mining will not directly impact any alluvial <br /> valley floor. Any water recharge of the nearby drainages and unconsolidated material from the mine <br /> would be negligible in comparison with the overall natural flows of the streams recharged in areas above <br /> the operation. <br /> The flood plains of Good Spring Creek, portions of Wilson Creek, and lower Taylor Creek may meet the <br /> geomorphic criteria and flood irrigation requirements of an alluvial valley floor. Runoff from the mining <br /> operations drains into these floodplains. Therefore, Colowyo has taken and will take appropriate <br /> measures to protect surface water. This includes designating stream buffer zones and installing <br /> sedimentation ponds on the drainages from disturbed areas feeding into surface water features (see <br /> Hydrology maps l0A and I IA). The overall role of the floodplains in collecting, storing, regulating and <br /> yielding water for agricultural activities has been unchanged and is anticipated to be unaffected by the <br /> mining operations. <br /> The possible alluvial valley floors near the mine impact areas will incur no adverse impact due to mining <br /> by Colowyo. Surface water pollution will be controlled by sedimentation ponds, sediment control <br /> measures,proper mining and reclamation techniques, and frequent monitoring of discharge water quantity <br /> and quality. The hydrologic consequences of mining will not result in disruption of the essential <br /> hydrologic functions due to the beneficial effects of water treatment and flood control provided by the <br /> sedimentation ponds. <br /> Additional Information <br /> The following excerpt taken from an October 8, 1981 letter from Colowyo to the Division expands further <br /> on the alluvium/colluvium issue in the Taylor Creek drainage. <br /> "In the original permit application submittal, Colowyo had described the soils in the <br /> Taylor Creek Drainage (Map lOB) as Quaternary Alluvium. The description was derived <br /> from a U. S. Department of Agriculture Service Soils Classification Survey at the series <br /> level which identified the Taylor Drainage soil as a(stratified alluvium)." <br /> South Taylor/Lower Wilson—Rule 2,Page 88 Revision Date: 6/22/20 <br /> Revision No.: MR-220 <br />
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