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PARTI <br />Page No. 5 <br />Permit No. COG-850000 <br />annual precipitation of 26.0 inches or less. <br />The above categories are subject to 40 CFR Part 434 Subparts B (Coal Preparation Plant and Associated Areas), D <br />(Alkaline Mine Drainage) and F (Miscellaneous Provisions). These limitations also apply to Western Coal Mining <br />Operations. The following limitations apply as outlined in these subparts. <br />Limitations Monitoring Sample <br />Parameter 30-Day, 7=Day Daily Rationale <br />Avg Avg, Max _ Frequency Type <br />---- <br />General Permit Requirements <br />Flow, MGD Report NA Report Discharge Evaluation Continuous / <br />Instantaneous2 <br />pH, s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly <br />Oil and Grease, mg/l N/A NA 10 State Effluent Regulations Weekly <br /> Federal Effluent Limitation Guid elines <br />Total Suspended Solids, mg/1 35 NA 70 Federal ELG Weekly <br />Total Iron, mg/l <br />Existing Sources (before 3.5 NA 7.0 Federal ELG Weekly <br />5/4/84) 3.0 NA 6.0 <br />New Sources (after 5/4/84) <br />Settleable Solids, ml/l Report NA 0.5 Federal ELG Weekly <br /> Site Specific Limitation <br />Total Dissolved Solids, mg/1 • Report NA Report Salinity Regulations Quarterly 4 <br />Total Phosphorus (as P), mg/1 •* Report NA Various Control Regulations Monthly <br />Total Recoverable Iron, ug/1 1000 NA NA Water Quality Standards Weekly <br />Other Pollutants of Concern Various NA Various Water Quality Standards Weekly <br />Whole Effluent Toxicity (WET) <br />Chronic Stat Diff and IC25 > IWC State Permit Limitations Quarterly <br />Acute LC50 > 100% State Permit Limitations <br />Recorder / <br />In-situ' <br />Grab <br />Visual 3 <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />3 Grab/Test <br />Grab <br />Footnotes 1-4, * and ** can be found under Part I.B.L <br />*** 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 <br />the stream segment. <br />ALTERNATE LIMITATIONS FOR ALKALINE MINE DRAINAGE AND <br />COAL PREPARATION AND ASSOCIATED AREAS <br />Any discharge or increase in the volume of a discharge from an above ground alkaline mine (or an underground <br />alkaline mine where the effluent is commingled with other categorical wastewater prior to discharge), caused by <br />precipitation within any 24-hour period less than or equal to the 10-year, 24-hour precipitation event (or snowmelt of <br />equivalent volume) my substitute the following limitations for these specific parameters only, subject to burden of <br />proof requirements described in Part I.B.6. <br /> Lttnitatiaus <br />Monitorin <br />Sarrtple <br />Parameter 30-Day 7-Day Daily Rationale g <br />Frequency Type <br /> Avg. Avg. Max. <br /> Federal Effluent Limi tation Guidelines <br />)tal Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />'t'otal Iron, mg/1 <br />Existing Sources (before Report NA Report Federal ELG Weekly Grab <br />5/4/84) D__.. AT A D e. _. <br />New Sources (after 5/4/84) <br />Any discharge or increase in the volume of a discharge from an above ground alkaline mine (or an underground <br />alkaline mine where the effluent is commingled with other categorical wastewater prior to discharge), caused by <br />precipitation within any 24-hour period greater than the 10-year. 24-hour precipitation event (or snowmelt of <br />equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of <br />proof requirements described in Part I.B.6.