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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 <br />Monitri <br />? <br /> <br />Sample <br />Parameter .30-Day 7-Day Daily Rationale ? <br />Frequency <br /> Avg!- Max <br /> General Permit Requirements <br /> Continuous / Recorder / <br />Flow, MGD Report NA Report Discharge Evaluation Instantaneous2 In-situ 2 <br />sm. <br />pH N/A NA 6.5-9.0 Water Quality Standards Weekly Grab <br />a <br />, <br />Oil and Grease, mg/1 N/A NA 10 State Effluent Regulations Weekly Visual <br /> Federal Effluent Limitation Guideline <br />Total Sus ended Solids mg/1 35 NA 70 Federal ELG Weekly Grab <br />P <br />Total Iron, m9/1 <br />Existing Sources (before 3.5 <br />3.0 <br />5/4/84) S 4e54/84) <br />NA 7.0 Federal ELG <br />NA 6.0 <br />Weekly Grab <br />New ounces (a Weekl <br />Settleable Solids, ml/l Report NA 0.5 Federal ELG Y <br />' Site Specific Limitation <br />Total Dissolved Solids, mg/l * Report NA Report Salinity Regulations Quarterly' <br />Total Phosphorus (as P), mg/1 ** Report NA Various Control Regulations Monthly <br />Total Recoverable Iron, ug/l 1000 NA NA Water Quality Standards Weekly <br />' Other Pollutants of Concern Various NA Various Water Quality Standards Weekly <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Whole Effluent Toxicity (WET) <br />Chronic Stat Diff and IC25 > IWC State Permit Limitations Quarterly 3 Grab/Test <br />' Acute LC50 > 100% State Permit Limitations Grab <br />Footnotes 1-4, * and ** can be found under Part I.B.1. <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 LUMTATIONS 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 10-3Lear 24-hour precipitation event (or snowmelt of <br />equivalent volume) lU substitute the following limitations for these specific parameters only, subject to burden of <br />proof requirements described in Part I.B.6. <br />' 'Tartutatidns Monitoring Sample - <br />Parameter • , 30-Day, 7-Day Daily Rationale Frequency' Type <br />Avg Max <br />Avg <br />- Federal Effluent Limitation Guidelines <br />..atal Suspended Solids, mg/l Report NA Report Federal ELG Weekly Grab <br />Total Iron, mg/l <br />' Existing Sources (before Report NA Report Federal ELG Weekly Grab <br />5/4/84) Report NA Report <br />New Sources (after 5/4/84 <br />Any discharge or increase in the volume of a discharge from an above around 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.