2015-03-11_PERMIT FILE - C1981038A ‎(2)‎

• Permit No: C1981038A
• IBM Index Class Name: Permit File
• Doc Date: 3/11/2015
• Section_Exhibit Name: VOLUME 8A - NPDES Permit
• Media Type: D
• Archive: Yes

COLORADO DEPARTMENTOFPUBLICHEALTHANDENVIRONMENT, Water Quality Control Division
Rationale, Page 6, COG-0850000 Coal Mining General Permit

Table III-4: Effluent Limitations and Monitoring Requirements -Post Mining reclamation Areas
Limitations Monitoring Sample
Parameter 30-Day 7-Day Daily Rationale Frequency i Type
Avg. Avg. Max.
__________________________________~__General Permit Requirements-------__w_____________________ _________
Flow, MGD Report NA Report Discharge Evaluation Continuous / z
Instantaneous Recorder /
In-situ
pH, s. u. N/A NA 6.5-9.0 Water Quality Standards Weekly Grab
Oil and Grease, mg/Z N/A NA 10 State Effluent Regulations Weekly Visual 3
_~______________________---_------- Federal Effluent Limitation Guidelines------------------------------ ------------
Total Suspended Solids, mg/1 35 NA 70 Federal ELG Weekly Grab
Totallron, mg/1
Existing Sources (before 5/4/84) 3.5 NA 7.0 Federal ELG Weekly Grab
New Sources (after 5/4/84) 3.0 NA 6.0
Settleable Solids, ml/l Report NA 0.5 Federal ELG Weekly Grab
_____________________________w_ ______Site Specific Limitations------ ----------------------------- ----------
Total Dissolved Solids, mg/l * Report NA Report Salinity Regulations Quarterly a Grab
Total Phosphorus (as P), mg/l ** Report NA Various Control Regulations Monthly Grab
Total Recoverable Iron, ug/l *** 1000 NA NA Water Quality Standards Weekly Grab
Other Pollutants of Concern Various NA Various Water Quality Standards Weekly Grab
Whole Effluent Toxicity (WET)
Chronic Stat Diff and IC25 > IWC State Permit Limitations Quarterly 3 Grab/Test
Acute LCSO > 100% State Permit Limitations Grab
Footnotes 1-4, *, **, and *** - See Footnotes under Table III-I and Table III-2.

5. Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage - Tables III-Sa th rough III-Se
apply to this category, subject to 40 CFR Part 434 Subparts C (Acid or Ferruginous Mine Drainage). At a minimum, the
following limitations may apply as outlined in these subparts.
Table III-Sa: Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage
Limitations
Monitoring
Sample
Parameter 30-Day 7-Day Daily Rationale Frequency Type
Avg. Avg. Max.
_____________________________________ ___General Permit Requirements-__ _______________________________ _________
Flow, MGD Report NA Report Discharge Evaluation Continuous / z
Instantaneous Recorder /
In-situ
pH, s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly Grab
Oil and Grease, mg/l N/A NA 10 State Effluent Regulations Weekly Visual 3
___________________~_________~Federal Effluent Limitation Guidelines------------------------------- - ----
Total Suspended Solids, mg/1 35 NA 70 Federal ELG Weekly Grab
Total Manganese, mg/1 2.0 NA 4.0 Federal ELG Weekly Grab
Totallron, mg/1
Existing Sources (before 5/4/84) 3. S NA 7.0 Federal ELG Weekly Grab
New Sources (after 5/4/84) 3.0 NA 6.0
Settleable Solids, ml/1 Report NA 0.5 Federal ELG Weekly Grab
__~_____________________________ ______Site Specific Limitations------- -------------------------- ----------
Total Dissolved Solids, mg/l * Report NA Report Salinity Regulations Quarterly ° Grab
Total Phosphorus (as P), mg/l ** Report NA Various Control Regulations Monthly Grab
Total Recoverable Iron, ug/1 *** 1000 NA NA Water Quality Standards Weekly Grab
Other Pollutants of Concern Various NA Various Water Quality Standards Weekly Grab
Whole Effluent Toxicity (WET)
Chronic Stat Diff and IC25 > IWC State Permit Limitations Quarterly 3 Grab/Test
Acute LCSO > 100% State Permit Limitations Grab
Footnotes 1-4, *, **, and *** - See Footnotes under Table III-1 and Table III-2