My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
GENERAL35005
DRMS
>
Back File Migration
>
General Documents
>
GENERAL35005
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 7:56:12 PM
Creation date
11/23/2007 8:08:30 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980003
IBM Index Class Name
General Documents
Doc Date
1/23/1987
Doc Name
Proposed Decision and Findings of Compliance For RN1
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.
/
47
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
Water quality of the upper and lower coals have levels of iron and lead in <br />excess of drinking water standards. The sodium absorption ratios (SAR) are <br />high in four of the six wells. Total dissolved solids concentrations show a <br />range of 864 mg/1 to 2610 mg/1. Copper and sodium levels have increased since <br />the initiation of monitoring. The water quality of spring 4 has deteriorated <br />substantially with significant increases in ammonia, sodium, sulfate, <br />bicarbonate, TDS and magnesium. Nitrate and iron concentrations have <br />decreased. Ammonia, lead and sulfate are present in high concentrations. <br />Spring 4 originally discharged from the upper coal seam and currently is <br />representative of the backfilled spoils aquifer. <br />The operation will probably affect the quality of water in the water-bearing <br />strata within the mine area. Once the pit is backfilled, the applicant <br />predicts that 82.5 acre-feet/year of water will leach through the spoil and <br />will pick up additional concentrations of constituents from the overburden. <br />This water will eventually find its way into water-bearing strata in the mine <br />area. Although the operations will potentially degrade the quality of this <br />ground water, the net effect would be insignificant. The water within these <br />strata are naturally of such poor quality and low availability that they are <br />not useful for many purposes. <br />The Twentymile Sandstone aquifer is separated from the lower coals by two to <br />three hundred feet of l~w permeability interbedded sandstones and shales (K = <br />0.012 - 0,12 gal/day/ft ). The thickness and low permeability of the <br />interburden materials suggest that this aquifer will not be impacted by mining <br />at Hayden Gulch Mine. <br />The Dry Creek alluvial wells at the loadout appear to monitor the poor quality <br />waters produced by Lewis Shale alluvium rather than any impacts from the <br />loadout. Excessively high EC levels of 22.4-76 mmhos/cm and high SARs (27-49) <br />mask any impacts from the loadout facility. <br />No alluvial deposits were documented between the mine and the East Fork of the <br />Williams Fork along Hayden Gulch. Consequently, there should be limited <br />impacts from spoils water contribution to the surface water regime. <br />The applicant examined ground water use within a four mile radius of the <br />permit area. Nine registered water wells were found along strike or up dip of <br />the mine and water was used for stock watering and domestic use. In many <br />cases these wells are hydrologically isolated from the mine zone. There were <br />no registered wells downdip of the permit area. Therefore, adjacent water <br />users are not predicted to be impacted. <br />2. Surface Water <br />The Hayden Gulch Mine lies in the upper reaches of the Hayden Gulch watershed, <br />which is tributary to the East Fork of the William Fork. The Hayden Gulch <br />loadout is located in the Dry Creek basin. Surface water flow within the <br />drainages is sporadic and occurs primarily in response to periods of snowmelt <br />or individual rainfall events. <br />-19- <br />i .. <br />
The URL can be used to link to this page
Your browser does not support the video tag.