My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2009-03-06_PERMIT FILE - C1981012A (6)
DRMS
>
Day Forward
>
Permit File
>
Coal
>
C1981012
>
2009-03-06_PERMIT FILE - C1981012A (6)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/11/2017 9:39:10 AM
Creation date
8/4/2009 11:01:08 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981012A
IBM Index Class Name
Permit File
Doc Date
3/6/2009
Section_Exhibit Name
Exhibit 22 NPDES Permit
Media Type
D
Archive
Yes
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
94
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
CO-0000906 <br />New Elk Mine Water Quality Assessment to the Left Fork of Apache <br />• . Raton Basin CBM Project (COG-900015), which discharges <br />Canyon Creek and to the Purgatoire River just downstream from the confluence of the North <br />and Middle Forks of the Purgatoire River. <br />Apache Canyon CBM (COG-900007), which discharges to the South Fork of the Purgatoire <br />River and to tributaries of the same. <br />Wet Canyon CBM Project (COG-900018), which discharges to tributaries to North Fork of <br />the Purgatoire River and to tributaries to the Purgatoire River. <br />t for <br />The ambient water quality background concentrations used in t ma s s not necessary to account <br />pollutants of concern es when calculating savailablenassh therefore wacapacities. <br />further for upstream our <br />Based on available information, there is no indication that non-point sources were a significant <br />source of pollutants of concern. Thus, non-point sources were not considered in this assessment. <br />Due to the in-stream low flow of zero for the Left Fork of Apache Canyon Creek, the not affected by nearby contributions. <br />capacities for Outfall 009 during times of low flow are <br />Therefore, modeling nearby facilities in conjunction with the New Elk Mine was not necessary. the Metals and Boron: Metals may occur naturally in rock sn boron <br />to air and waterlcre ting a <br />groundwater. Earth disturbances, such as mining operations, expose <br />potential for these elements to be present in elevated concentrations; similarly, mine water from <br />• underground sources may contain boron. Thus, boron, arsenic, cadmium, chromium, copper, iron, <br />lead, manganese, mercury, nickel, selenium, silver and zinc, which have been identified as pollutants <br />potentially present in mine water discharges, are evaluated in this assessment. According to the <br />Agency for Toxic Substances and Disease Registry, chromium in the trivalent form occurs naturally <br />in the environment whereas hexavalent chromium is produced by industrial processes. Industrial <br />processes at this facility would not generate hexavalent chromium and therefore the evaluation for <br />chromium is limited to the trivalent form. <br />Using the mass-balance equation provided in the beginning of Section IV, the low flows provided in <br />Section III, the background concentrations contained in Section II, and the in-stream standards for <br />metals shown in Section II, assimilative capacities were calculated. The data used and the resulting <br />calculations of the allowable discharge concentrations, M2, are set forth for Outfall 001 in Table A- <br />6a for chronic assimilative capacities and in Table A-6b for acute assimilative forth in Table A 6or Outfall <br />009, the assimilative capacities are equal to the stream standard as set • <br /> <br />Appendix A cWQA Version s-acFneL» Page 13 of 29 Last Revised August 26, 2008
The URL can be used to link to this page
Your browser does not support the video tag.