2018-08-08_PERMIT FILE - C1982056 (14)

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PART 11 Page No. 5 Permit No. COG -850000 annual precipitation of 26.0 inches or less. Limitations The above categories are subject to 40 CFR Part 434 Subparts B (Coal Preparation Plant and Associated Areas), D (Alkaline Mine Drainage) and F (Miscellaneous Provisions). These limitations also apply to Western Coal Mining Operations. The following limitations apply as outlined in these subparts. 7 -Day Daily Rationale Parameter Limitations 30 -Day 7 -Day Daily Rationale Monitoring Frequency. Sample Type Avg. Avg. Avg. Max. -------_------------------General Permit Requirements-- ------ ----------- Limitation Guidelines----_—�_`__�_—__—___ Flow, MGD Report NA Report Discharge Evaluation Continuous / z Recorder/ Report Federal ELG Weekly Instantaneous In-situ pH, s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly Grab Oil and Grease, mg/I N/A NA 10 State Effluent Regulations Weekly Visual' _—---.______---_—_Federal Effluent Limitation Guidelines -------------------------- Weekly Grab Total Suspended Solids, mg/I 35 NA 70 Federal ELG Weekly Grab Total Iron, mg/I Existing Sources (before 3.5 NA 7.0 Federal ELG Weekly Grab 5/4/84) 3.0 NA 6.0 New Sources (after 5/4/84) Settleable Solids, ml/I Report NA 0.5 Federal ELG Weekly Grab — Site Specific Total Dissolved Solids, mg/I • Report NA Report Salinity Regulations Quarterly ° Grab Total Phosphorus (as P), mg/l •• Report NA Various Control Regulations Monthly Grab Total Recoverable Iron, ug/I 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 Gmb/Test Acute LC50 > 100% State Permit Limitations rrah Footnotes 1-4, • and I* can be found under Part 1.B.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 standard is applicable to the stream segment. ALTERNATE LIMITATIONS FOR ALKALINE MINE DRAINAGE AND COAL PREPARATION AND ASSOCIATED AREAS 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 less than or equal to the 10 -year. 24-hour preciaitation 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.6. 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 periodrg eater than 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.6. Limitations Monitoring' Sample Parameter 30 -Day 7 -Day Daily Rationale Frequency Type Avg. Avg. Max. -- ---------------Federal Effluent Limitation Guidelines----_—�_`__�_—__—___ Total Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab Total Iron, mg/I Existing Sources (before 5/4/84) Report NA Report Federal ELG Weekly Grab New Sources (after 5/4/84) Report NA Report 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 periodrg eater than 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.6.