2012-06-20_PERMIT FILE - C2010089 ‎(57)‎

• Permit No: C2010089A
• IBM Index Class Name: PERMIT FILE
• Doc Date: 6/20/2012
• Doc Name: Water Discharge Permit
• Section_Exhibit Name: Appendix 2.05.3‎(4)‎-3
• Media Type: D
• Archive: Yes

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division
Rationale, Page 3, COG - 0850000 Coal Mining General Permit
Table III -2a: Effluent Limitations and Monitoring Requirements – Alkaline Drainage, Coal Preparation Plants and Coal
Preparation Plant Associated Areas and Western Alkaline Coal Mining (additional requirements apply to Western
Coal Minin ; See Section IILA.3 of this rationale) `'
Perritit Requirements
Continuous /
Instantaneous
Weekly
Weekly
Flow, MGD
Report NA
Report
Discharge Evaluation
Water Quality Standards
State Effluent Regulations
pH, s.u. N/A NA 6.5 -9.0
Oil and Grease, mg/1 N/A NA 10
�_ -- Federal Effluent Limitation Guidelines
Total Suspended Solids, ing/l 35 NA 70 Federal ELG
Total Iron, rng/1
Existing Sources (before 5/9/84) 3.5 NA 7.0 - Federal ELG
New Sources (after 5/4/84) 3.0 NA 6.0
Settleable Solids, rrrl/1 • Report NA 0.5 Federal ELG
–Site Specific Limitations
Total Dissolved Solids, mg/l * Report NA Report Salinity Regulations
Total Phosphorus (as P), mg/1 ** Report NA Various Control Regulations
Total Recoverable Iron, ug/1 * ** 1000 NA NA Water Quality Standards
Other Pollutants of Concern Various NA Various Water Quality Standards
Whole Effluent Toxicity (WET)
- . Chronic Stat DO' and IC25 > IWC State Permit Limitations
Acute LCSO > 100% State Permit Limitations
Recorder /
In -situ 2
Grab •
Visual'
Weekly Grab
Weekly Grab
Weekly Grab
Quarterly 4 Grab
Monthly Grab
Weekly Grab
Weekly Grab
Quarterly 3 Grab /Test
Grab
Footnotes 1-4, *, and * *, See Footnotes under Table 111 -1 ,
* ** This limitation will apply and will substitute for the 30 -day average total iron limit based upon the ELG when a total recoverable iron siandard is applicable to the
stream segment.
Alternate Lirnitations For Alkaline Mine Drainage, Coal Preparation and Associated Areas and Western Alkaline Coal
Mining – Table III -2b contains limitations for any discharge or increase in the volunte.of a discharge from an above ground
alkaline urine (or an underground alkaline mine where the effluent is commingled with other categorical wastewater prior to
discharge), caused by precipitation within any 24 -hour period less than or equal to the 10 year, 24 -hour precipitation event
(or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, subject to
burden of proof requirements described in Part I.B.4 of the permit.
Table 111 -2b: Alternate Effluent Limitations and Monitoring Requirements – Alkaline Drainage, Coal Preparation Plants and
Coal Preparation Plant Associated Areas and Western Alkaline Coal Mining (additional requirements apply to
Western Coal Minin;, See Section IILA.3 o this rationale)
___.___- ______– _— ______ —_ -- Federal Effluent Limitation Guidelines----_________------------------
Total Suspended Solids, rng/I Report NA Report Federal ELG Weekly
Total Iron, mg/1
Existing Sources (before 5/4/84) Report NA Report Federal ELG Weekly Grab
New Sources (after 5/9/84) Report NA Report
Grab
Alternate Limitations For Alkaline Mine Drainage, Coal Preparation and Associated Areas, and Western Alkaline Coa
Mining - Table III -2c contains (imitations for any discharge or increase in the volume of a discharge from an above ground
alkaline mine (or an underground alkaline mine where the effluent is commingled with other categorical wastewater prior to
discharge), caused by precipitation within any 24 -hour period greater than the 1 0-vear, 24 -hour precipitation event (or
snowmelt of equivalent volume) malt substitute the following limitations for these specific parameters only, subject to burden
of proof requirements described in Part I.B.4 of the permit.