2009-03-06_PERMIT FILE - C1981012A ‎(6)‎

• 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

CO-0000906
New Elk Mine Water Quality Assessment
is
•
Table A-3
TVS-Based Metals Water Quality Standards for CO-0000906
Based on the Table Value Standards Contained in the Colorado Department of Public Health
and Environment Water Quality Control Commission Regulation io132
Calculated Using the Following Value for Hardness as CaC03: 142 In-Stream Water
Formula Used
Parameter Quality. Standard
(0.9151(In(hardness))-3.6236)
Acute 2.3 41 [1 .136672-0.0418381n(hardness)]e
7998(in(hardness))-4.4451)
(0
Cadmium, Dissolved C11rOTllC 0.55 ? [1 .
.101672-0.0418381n(hardness)]e
Hexavalent Chromium,
Acute
16 Wg l
Numeric standards provided, formula not applicable
l
Dissolved Chronic 11 µg/1 e
Numeric standards provided, formula not applicab
(0.9422(ln(hardness))-1.7408)
Acute 19 µg?l e
Copper, Dissolved
i
Ch
12 µg/1
(0.8545(ln(hardness))-1.7428)
e
c
ron (
Acute 94 µg/1

! [].46203-0.1457121n(hardness)][e 4.705)]
273(ln(hardness))
(1
Lead, Dissolved Chronic 41
3.7 .
[1.46203-0.1457121n(hardness)][e
(0.3331(ln(hardness))+6.4676)
Acute 3356 µg/1 e
Manganese, Dissolved Chronic 1854 41 e (0.333 l(ln(hardness))+5.8743)
(0.846(ln(hardness))+2.253)
Acute 630 µgn
e
Nickel, Dissolved Chronic 70 41 e (0.846(ln(hardness))+0.0554)
Acute 18.4 µg?l Numeric standards provided, formula not applicable
Selenium, Dissolved
Chronic
4.6 41
Numeric standards provided, formula not applicable
Acute 3.7 µgf i
X12 e (1.72(ln(hardness))-6.52)
Silver, Dissolved Chronic
µg?l
0.14 e (1.72(ln(hardness))-10.51)

Acute
193 110 (0.8525(In(hardness))+1.06 ] 7)
0.978e
Zinc, Dissolved Chronic 168 41 0.986 e (0.8525(ln(hardness))+0.9109)
'? I
Last Revised August 26, 2008
Appendix A (wQA version 5-4(FABL)) Page 8 of 29