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GENERAL32251
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GENERAL32251
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Last modified
8/24/2016 7:54:55 PM
Creation date
11/23/2007 7:15:01 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1989074
IBM Index Class Name
General Documents
Doc Date
8/31/1990
Doc Name
Proposed Decision & Findings of Compliance for a New Permit
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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Discontinuous aquifers of the Vermejo Formation in the area to be mined are <br />under unconfined conditions, with water levels responding to precipitation and <br />snowmelt. Engleville Gulch is a bedrock-controlled channel, with only <br />scattered pockets of alluvium and no baseflow contribution to streamflaw. <br />Since the channel will not be mined through no change in this situation is <br />expected. Any spoil spring development would create a small baseflow of <br />poor-quality water, which would be diluted during periods of rainfall or <br />snowmelt. Since Engleville Gulch currently flows only in response to <br />precipitation, no interruption or degradation of a water source is projected. <br />Following mining and reclamation of the site, the back filled spoil will <br />provide pathways for infiltrating rainfall and snowmelt to recharge more <br />permeable beds of the Vermejo Formation. The reclaimed spoil may be more <br />permeable or less permeable than the present surface materials, but due to the <br />small size of the pit, and the poor aquifer properties of the <br />Vermejo Formation, impacts to ground water recharge capacity will be minimal. <br />The average annual precipitation in the area is T3" to i5". The potential <br />evapotranspiration rate for the region averages about 42". This condition <br />limits the potential for precipitation to infiltrate through the spoils and <br />recharge the aquifer. <br />At this time given the geochemical data presented, it is not anticipated that <br />any toxic material will be encountered. A minimum of 2 feet of soil will be <br />placed over non coal waste disposal sites. Side slopes will be stabilized and <br />the entire area will be revegetated in accordance with the reclamation plan. <br />All disturbed areas will be tops oiled and stabilized with vegetation. As a <br />result of the measures which will be taken to control erosion and <br />sedimentation during the operation the proposed reclamation plan should yield <br />an improvement in the existing quality of ground and surface water. <br />- 13 - <br />
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