PERMFILE107381

• Permit No: C1994082A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: NPDES PERMIT YOAST MINE
• Section_Exhibit Name: TAB 15 APPENDIX 15-1
• Media Type: D
• Archive: Yes

COLORADO DEPARTMENT OF PURL/C HLAL7 H AND ENVIRONMEM; Water Qttdliry Control Division
Rationale -Page 2, Permit No. CO-00(10221
C.. Discharge Points:
Table //-] -Discharge Points
/II

OatfaU Wastewater Source Avg Flow, Daily Maz 70-yr/24-hr _ Receiving Water
MC.D Flow, MGD E:•ent Vol
002 SR, SS 0.3316 7.4233 3.8900 MG Little Grasry Ck, trib to
Grassy Creek
003 SR, TW 0.05'03 0.3557 0.1343 MG Little Grasry Ck, trib to
Grasry Creek
004 SR, SS 0.1948
' 4.6844 2.1776 MG Cow Ca Ck, trib to
Fish Creek
005 SR, SS 0.0165 0.7978 1.5179 MG Unnamed Trib to Dry
Creek
006 SR, SS, MW 0.0543 1.1563 4.1350 MG Unnamed Trib to Dry
Creek
008 SR, SS, MW 0.1182 2.1600 1.8704 MG Bond Ck, trib to Fish
Creek
009 SR 0.0422 0.1584 1.1274 MG Unnamed Trib to Sage
Creek
010 SR, SS, MW O.lb'1 * 3.432* 5.9631 MG Armand Draw, Crib to
Grassy Creek
011 SR, SS, MW 0.032* 0.963* 0.8277 MG Grasry Creek
SR means Surface Runoff; SS means Spoils Spring, MW means Mine Water, TW means Truck Wash
* Design volumes
RECE/VING STREAM
A. /dentificalion, Classification artd Standards
U

Identification: Discharges ra Grassy Creek, Dn' Creek and Sage Creek, Segment 12 of the Yampa River Sub-basin
of the Upper Colorado River Basin and ro Fish Creek, Segment 13b ojthe Yampa River Sub-basin of lire Upper
Colorado River Basin.
Classificariort: Segmenr I2 is classified jor rlre fol[ox~ing uses: Use Protected; Recreation, Class 1; A~puaric Lije,
Class 2 (cold); Agriculture. Segmenr 13b is classified for the following uses: Recreation, Class 1: Aquatic Life,
Class 1 (cold); Agriculture.
3. Numeric Standards: The standards ir~hiclr hai a been assigned in accordance with the classifications for segment 12
cart be found in the Classifications and Numeric Standards jor the Upper Colorado River Basin 3.3.0 15 CCR
1002-8), as amended December 11, 1995. There are no metals standards for this segment.
The complete (isr of standards which have been assigned in accordance with the classification for segment 136 can
also be found in the Classifications and Numeric Standards jor the Upper Colorado River Basin 3.3.0 (S CCR
1002-8), as amended December 11. 1995. The following numeric standards x~hich have been assigned in
accordance wish the above classifications will be used ro develop effluent limitations.
Ph~~sical and Bioloeical
pH = 6.5 - 9.0 s. u.
•
Metals Criteria Standard Analytical Method
Iron (Fe) Chronic 1000 ug/P Total Recovu~able