1988-04-11_PERMIT FILE - C1981008A ‎(14)‎

• Permit No: C1981008A
• IBM Index Class Name: PERMIT FILE
• Doc Date: 4/11/1988
• Doc Name: NPDES Permit CO-0000213
• Section_Exhibit Name: Tab 7 Appendix 7-6
• Media Type: D
• Archive: Yes

COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
Rationale - Page 3. Permit No. CO-000021.3
APPENDIX A
Water quality standard (WQS) based effluent limitations are calculated using
Lhe fo Llowing mass balance formula:
LI, WQS 07-10 t QEFF)
QEFF
Where:
EL = Calculated effluent limitation (mg/1)
WQS = Applicable water quality standard (mg/1)
Q7-10 = Receiving water 7-day, 1.0-year low flow (7.0 cfs)
QEFF = Maximum effluent flow (1.14 cfs)
1. Total Recoverable Copper:
EL - 0.018 (7.0 + 1.14) - 0.13 mg/1
1.14
2. T.R. Iron:
EL = 1.0 (1.0 + 1.14) - 7.14 mg/l
1.14
3. T.R. Manganese:
EL - 1.0 (7.0 + 1.14), - 7.14 mg/l
1.14
4. T.R. Zinc:
EL - 0.085 (7.0 + 1.14) - 0.61 mg/1
1.14
5. T.R. Cadmium:
EL = 0.001 (7.0 + 1.14) - 0.007 mg/1
1.14
6. T.R. Silver:
EL - 0.0001 (7.0 + 1.14) - 0.0007 mg/l
1.14
7-6-35