My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
GENERAL35100
DRMS
>
Back File Migration
>
General Documents
>
GENERAL35100
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 7:56:14 PM
Creation date
11/23/2007 8:10:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981011
IBM Index Class Name
General Documents
Doc Date
5/5/1993
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN2
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
23
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Groundwater <br />Two aquifers exist within the permit area: alluvial deposits associated with the stream of <br />Trout Creek and bedrock groundwater stored in the Tow Creek Sandstone. Alluvial <br />deposits line Trout Creek within the permit and adjacent areas. The nearest alluvial <br />well downstream of the mine is over a mile and a half away. <br />Monitoring wells controlled by adjacent mines show that the only regional ground water <br />aquifer existing within this permit area is the Tow Creek Sandstone. The Tow Creek <br />Sandstone is separated from the coal seam that was mined by 600 feet of interbedded <br />sandstones, shales and siltstones. These units have a very low vertical permeability, <br />except possibly where faulted. <br />Sunland Mining Corp, conducted a spring survey to observe other possible ground water <br />aquifers in the permit and adjacent area. The spring survey (Map Exhibit P of the <br />permit application) identified several springs in and adjacent to the permit area. The <br />springs within the permit area and those to the northwest near Middle Creek do not <br />appear to be fault or fracture controlled. Rather, they appear to be stratigraphically <br />controlled, perched aquifers. This conclusion is substantiated by the low electrical <br />conductivity indicating a short flow path between the recharge and discharge areas. <br />These springs, located one-half mile northwest of the mine workings, are the only springs <br />that could have possibly been impacted by mining. Some minor effects to the quantity of <br />flow from these springs might be realized due to subsidence above the workings. To <br />date, no problems have been noted with these springs. If a worst-case analysis assumes <br />that all of the flow from the springs would be interrupted, the resultant flow reduction in <br />Middle Creek would be 0.02 cubic feet per second. This amount is insignificant to the <br />flow of Middle Creek. <br />The only regional aquifer within the permit area is the Tow Creek Sandstone which is <br />over 600 feet below the coal seam being mined. The Trout Creek Sandstone, another <br />regional aquifer in the general area, has been eroded from above the coal seams being <br />mined. Because of the low permeability of the interbedded shales and siltstones of the <br />Iles Formation, the Tow Creek Sandstone is recharged primarily where it subcrops in the <br />stream bottoms. The nearest subcrop of the Tow Creek Sandstone to the permit area is <br />approximately one mile upstream of the mine. Low vertical permeability results in the <br />formation of perched aquifers in local lenticular strata. These perched aquifers recharge <br />and discharge within a short distance forming small seasonal springs and seeps. <br />Sunland Mining Corporation conducted a mine inflow study. This information is <br />provided on Map 1 of the permit application. This map shows that the mine inflow is <br />restricted to floor seeps occurring in Fault Block No. 1 and the total rate of water <br />production underground is 40 gallons per hour. An underground inspection of the mine <br />was conducted by the Division which confirmed that absolutely no water was being made <br />Apex No. 2 Mine, C-81-011 6 May ~, 1993 <br />
The URL can be used to link to this page
Your browser does not support the video tag.