2011-08-18_HYDROLOGY - M1977306

• Permit No: M1977306
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/18/2011
• Doc Name: Colorado Discharge Permit System
• From: Water Quality Control Division
• To: Cotter Corporation
• Email Name: GRM
• Media Type: D
• Archive: No

Table A -4
TVS -Based Metals Water Quality Standards for CO0036251
Based on the Table Value Standards Contained in the Colorado Department of Public Health and
Environment Water Quality Control Commission Regulation 35
Parameter
In- Stream Water
Quality Standard
TVS Formula:
Hardness (mg/l) as Ca + Mg = 203
Cadmium, Dissolved
Acute
Chronic
9.2 µg/1
(0.9I51(ln (hardnes s ))- 3.1485)
[1.136672- 0.041838ln(hardness)]e
3.8 µg/1
[1.101672- 0.0418381n(hardness)]e (0.7998 (ln (h a rd n e s s ))- 4.4451)
Trivalent Chromium,
Acute
1018 µg/1
e (0.819(ln(hardness)) +2.5736)
Hexavalent Chromium,
Dissolved
Acute
16 µg/1
Numeric standards provided, formula not applicable
Chronic
11 µg/1
Numeric standards provided, formula not applicable
Copper, Dissolved
Acute
26 µg/1
e (0.9422(1n(hardness))- 1.7408)
Chronic
16 µg/1
e (0.8545(1n(hardness))- 1.7428)
Lead, Dissolved
Acute
138 µg/1
[1.46203- 0.1457121n( hardness )] [e (1.273(ln(hardness)) - 1.46)]
Chronic
5.4 µg/1
[1. 46203- 0.1457121n( hardness )] [e (1.273(In(hardness)) - 4.705)]
Manganese, Dissolved
Acute
3780 µg/1
e (0.3331(In(hardness))+6.4676)
Chronic
2088 1.1g1
e (0.3331(In(hardness)) + 5 8743)
Nickel, Dissolved
Acute
852 µg/1
e (0.846(ln(hardness)) +2.253)
Chronic
95 µg/1
e (0.846(ln(hardness))+0.0554)
Selenium, Dissolved
Acute
18.4 µg1
Numeric standards provided, formula not applicable
Chronic
4.6 µg/1
Numeric standards provided, fonnula not applicable
Silver, Dissolved
Acute
6.9 µg/1
1/2 e (1.72(ln(hardness)) -6.52)
Chronic
1.1 µg/1
e (1.720n(hardness)) -9.06)
Uranium, Dissolved
Acute
5242 1.tg/1
e (1.1021(In(hardness)) +2.7088)
Chronic
3274 µg/1
e (1.1021(ln(hardness)) +2.2382)
Zinc, Dissolved
Acute
214 µg/1
0.978e (0.8525(ln(hardness)) +1.0617)
Chronic
215 µg/1
0.986 e (0.8525(1n(hardness))+0.9109)
Cotter Corporation Water Quality Assessment
CO0036251
Regulation 93 - 303(d) List, Total Maximum Daily Loads and Monitoring and Evaluation List
This stream segment is on the 303(d) list of water quality impacted streams for total recoverable iron.
According to Division standard procedure, the Division's Environmental Data Unit investigates issues of
water quality standard exceedances. For a receiving water placed on this list, the Restoration and
Protection Unit is tasked with developing the Total Maximum Daily Loads (TMDLs) and the Waste
Load Allocation (WLAs) to be distributed to the affected facilities. WLAs for total recoverable iron
have not yet been established and the allowable concentration calculated in the following sections may
change upon further evaluation by the Division
Appendix A (wQA v 7.0)
Page 11 of 23 Last Revised 06/10/10 /AO