My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2009-06-22_GENERAL DOCUMENTS - C1981033 (2)
DRMS
>
Day Forward
>
General Documents
>
Coal
>
C1981033
>
2009-06-22_GENERAL DOCUMENTS - C1981033 (2)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 3:48:02 PM
Creation date
6/22/2009 11:05:39 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981033
IBM Index Class Name
General Documents
Doc Date
6/22/2009
Doc Name
Proposed Decision & Findings of Compliance for RN5
Permit Index Doc Type
Findings
Email Name
JJD
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.
/
30
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
No. 3 Mine sediment ponds must meet receiving stream standards and, therefore, not <br />degrade surface water resources. <br />In June, 1995, personnel at the Bear Coal Company discovered inflow to the 3rd West <br />Section of the Bear No. 3 Mine. The inflow was measured at approximately 18 gpm. <br />During 1996, water reportedly continued to flow from the 3rd West seals and also began <br />flowing from the bleeder seals in the 2nd west Section. In November, 1996, Bear Coal <br />Company permanently ceased all mining operations at the Bear No. 3 Mine and sealed the <br />three existing portals. Since that time, no additional information has been obtained <br />concerning the source or rate of mine inflow to the Bear No. 3 Mine. There has been no <br />recorded discharge from the Bear No. 3 Mine. <br />Groundwater quantity and quality in the alluvial material underlying the Bear No. 3 <br />facilities are closely related to water quality and flow of the adjacent North Fork of the <br />Gunnison River. Groundwater flow in the alluvial material is controlled by the water level <br />and gradient of the North Fork of the Gunnison River. Water levels in the alluvial material <br />are generally 5.0 to 8.0 feet below the land surface. <br />Disturbance of the alluvial material is not expected to significantly reduce the quantity of <br />water present in the alluvial material underlying the facilities area. Some degradation of <br />the quality of water in the alluvial material is evident based on field conductivity and <br />laboratory analyses of water samples taken from two on-site alluvial groundwater <br />monitoring wells (wells AA1 and AA3). Over time, the concentration of total dissolved <br />solids has increased significantly in downgradient monitoring well AA1. Water samples <br />obtained from well AAl, from 1987 through 1992, show elevated levels of certain <br />constituents including boron, calcium, chloride, fluoride, magnesium, nitrate, potassium, <br />sodium, and sulfate compared to water samples analyzed from well AAl prior to 1986 and <br />compared to water samples analyzed from well AA3 which is upstream of the facilities <br />area. There are two likely sources for the contamination of alluvial well AA1. The first <br />possible source of this contamination is the coal stockpile, which was formerly located <br />upgradient of well AA1. The second possible source is the spring that is located near the <br />pre-law Edwards Mine portal. <br />Adequate dilution of any effluent generated at the Bear No. 3 Mine will mitigate any <br />effects of reduced water quality in the Bear No. 3 alluvium on downstream AVFs. The <br />greater the distance from the Bear No. 3 Mine, the greater the dilution of any effluent. <br />The potential impacts are considered insignificant, and the applicant's groundwater and <br />surface monitoring program should detect any changes in the quantity and quality of <br />ground and surface water supplied to the North Fork of the Gunnison River and, therefore, <br />to alluvial valley floors downstream. <br />No potentially significant impacts to the AVF have been identified. The monitoring plan <br />outlined in the permit application will ensure that the essential hydrologic functions of the <br />AVF are maintained by monitoring the development of any effluent at the mine site. <br />XVIH. Operations on Prime Farmland <br />Prime farmland investigation information is located in Section 2.04.12 and 4.25 of the Bear No. <br />3 permit application. <br />27
The URL can be used to link to this page
Your browser does not support the video tag.