My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2012-08-31_HYDROLOGY - C1981014
DRMS
>
Day Forward
>
Hydrology
>
Coal
>
C1981014
>
2012-08-31_HYDROLOGY - C1981014
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 5:07:17 PM
Creation date
9/4/2012 12:46:44 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981014
IBM Index Class Name
HYDROLOGY
Doc Date
8/31/2012
Doc Name
Repair of MW-NW Well
From
Energy Fuels Coal, Inc
To
DRMS
Permit Index Doc Type
Other Ground Water
Email Name
JHB
DIH
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.
/
4
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
energy fuels coal, inc. <br />southtield mine • post office box 459 • tlorence, colorado 81226 • (719) 784 -6395 <br />August 28, 2012 <br />Ms. Janet Binns — Reclamation Specialist <br />Colorado Division of Reclamation Mining & Safety <br />1313 Sherman St — Room 215 <br />Denver, CO 80203 <br />RE: Monitor Well MW -NW - Broken Cable Removal <br />Energy Fuels Coal, Inc. — Permit No. C -81 -014 — Southfield Mine <br />o cerveo <br />AEG 312412 <br />Of R 50060, <br />pWi W <br />ppr►n9 & <br />L'/ <br />Dear Janet Binns: <br />This is to advise that the broken 1/16 inch diameter cable (354 feet) that was coiled in the MW- <br />NW monitor well at the Southfield mine was removed August 27, 2012. Two photos showing the removal <br />tool and the coiled cable after removal are enclosed. The tool used was a modified version of that which <br />was suggested by Kent Gorham, formerly with the DRMS. The fabricator added a scissor action to the <br />tool that allowed the tool to close on the entangled coils for successful removal. <br />Pursuant to the removal of the cable, an electronic water probe, having been pretested for <br />operation, was lowered to the 356 ft level in the well. The probe was raised and lowered approximately 10 <br />ft a dozen times in the range of the 356 ft well level to assure any contact with potential water in the well. <br />As had been reported in previous water probing reports, no water was detected in the MW -NW monitor <br />well at or above the 356 ft level in the well. As further assurance, it was noted that there was no moisture <br />on the end of the probe when it was retrieved from the well. <br />The DRMS concurred (letter of August 8, 2012) "that there is hydrologic connection of the well <br />with the mine workings". This was evidenced from the 1,500 gallon water test dumped down the well on <br />April 17, 2012. It should be noted here that the well at issue was formerly used as a dewatering well in the <br />1s North Section of the mine. As a `dewatering' well the bottom of the well (380 ft depth) would be <br />positioned at the floor level (or below) of the mine, not at the roof level, for dewatering purposes. <br />Borehole drill logs identify the thickness of the coal seam near the MW -NW as 5.5 ft. This would place <br />the roof level of the mine at the 374.5 or 374 ft level of the well casing. Given that the measured depth to <br />the current obstruction in the well is 356 ft from the top of the well, that leaves a distance of 18 or 18.5 <br />vertical feet of void area between the obstruction and the projected roof level in the mine. Given that the <br />mine was not pillared in that area and considering that the well is located in an `intersection' of a mine <br />entry and a crosscut, an 18 foot void of roof fall or caving is not unusual. <br />Energy Fuels reiterates that the 356 ft level in the well, being open to flow to the mine void, is <br />adequate for monitoring and sampling mine water and concurs with the statement in the DRMS <br />inspection report of April 17, 2012, " - - based on the previous fact that this well entered the mine <br />workings and that our findings from this inspection that this well serves the purpose of detecting, <br />measuring and sampling water in the [potential] flooded Southfield mine workings". <br />
The URL can be used to link to this page
Your browser does not support the video tag.