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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />apply So this category, subject to 40 CFR Part 434 Subparts C (Acid or Ferruginous Mine Drainage). At a minimum, the <br />Rationale, Page 6, COG -0850000 <br />Coal Mining General Permit <br />Table 111-4: Effluent Limitations and Monitoring Requirements — Post <br />Mining reclamation Areas <br />Parameter <br />Limitations <br />30 -Day 7 -Day Daily <br />Rationale <br />Monitoring <br />Frequency u <br />Sample <br />Type <br />30 -Day 7 -Day Daily <br />Avg. Avg. Max. <br />Monitoring <br />Frequency <br />Sample <br />Type <br />Avg. Avg. Max. <br />General Permit Requirements <br />Flow, MGD <br />Report NA Report <br />Discharge Evaluation <br />Continuousl <br />� <br />Instantaneous <br />Recorder/ <br />In-situ a <br />pH, s. u. <br />N/A NA 65-9.0 <br />Water Quality Standards <br />Weekly <br />Grab <br />Oil and Grease, mg1I <br />N/A NA 10 <br />State Effluent Regulations <br />Weekly <br />Visual' <br />NIA NA 10 <br />Federal Effluent Limitation Guidelines <br />Weekly <br />Visual 3 <br />Total Suspended Solids, mg/1 <br />35 NA 70 <br />Federal ELG <br />Weekly <br />Grab <br />Total Iron, mg/1 <br />Federal ELG <br />Weekly <br />Grab <br />Total Manganese, mgt! <br />Existing Sources (before 5/4/84) <br />3.5 NA 7.0 <br />Federal ELG <br />Weekly <br />Grab <br />New Sources (after 5/4/84) <br />3.0 NA 6.0 <br />Existing Sources (before 514184) <br />Settleable Solids, mill <br />Report NA 0.5 <br />Federal ELG <br />Weekly <br />Grab <br />- <br />°fte Specific Limitations <br />Settleable Solids, mI4 <br />Total Dissolved Solids, mg/1 • <br />Report NA Report <br />Salinity Regulations <br />Quarterly <br />Grab <br />Total Phosphorus (as P), mg/1 •' <br />Report NA Various <br />Control Regulations <br />Monthly Gra <br />b <br />Total Recoverable Iron, ug/l ••' <br />1000 NA NA <br />Water Quality Standards <br />Weekly <br />Grab <br />Other Pollutants of Concern <br />Various NA Various <br />Water Quality Standards <br />Weekly <br />Grab <br />Whole Effluent Toxicity (WE7) <br />Water Quality Standards <br />Weekly <br />Grab <br />Other Pollutants of Concern <br />Chronic <br />Stat Dii fand IC25 > IWC <br />State Permit Limitations <br />Quarterly <br />3 Grab%Test <br />Acute <br />LC50 > 100% <br />State Permit Limitations <br />Grab <br />Footnotes 1-4, ', ••, and ••• - See Footnotes under Table 111-I and Table 11I-2 <br />5. Effluent Limitations and Monitoring Requirements - Acid or Ferrui;inous Mine Drainajze - Tables 111-5a through 111-5e <br />apply So this category, subject to 40 CFR Part 434 Subparts C (Acid or Ferruginous Mine Drainage). At a minimum, the <br />following limitations may <br />apply as outlined in these subparts. <br />Table III-Sa: Effluent Limitations and Monitoring Requirements —Acid <br />or Ferruginous Mine Drainage <br />Limitations <br />Parameter <br />30 -Day 7 -Day Daily <br />Rationale <br />Monitoring <br />Frequency <br />Sample <br />Type <br />Avg. Avg. Max. <br />General Permit Requirements <br />Flow, MGD <br />Report NA Report <br />Discharge Evaluation <br />Continuous / <br />Instantaneousz <br />Recorder l <br />In-situ <br />pH, s. u <br />NIA NA 6.5-9.0 <br />Water Quality Standards <br />Weekly <br />Grab <br />Oil and Grease, mg,'I <br />NIA NA 10 <br />State Effluent Regulations <br />Weekly <br />Visual 3 <br />— <br />Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg/1 <br />35 NA 70 <br />Federal ELG <br />Weekly <br />Grab <br />Total Manganese, mgt! <br />20 NA 40 <br />Federal ELG <br />Weekly <br />Grab <br />Total Iron, mg9 <br />Existing Sources (before 514184) <br />3 5 NA 7.0 <br />Federal ELG <br />Weekly <br />Grab <br />New Sources (after 514184) <br />3.0 NA 6.0 <br />Settleable Solids, mI4 <br />Report NA 0.5 <br />Federal ELG <br />Weekly <br />Grab <br />— — — <br />Site Specific Limitations <br />Total Dissolved Solids, mgt! • <br />Report NA Report <br />Salinity Regulations <br />Quarterly 4 <br />Grab <br />Total Phosphorus (as P), mg/1 •• <br />Report NA Various <br />Control Regulations <br />Monthly Gra <br />b <br />Total Recoverable Iron, ug/l *** <br />1000 NA NA <br />Water Quality Standards <br />Weekly <br />Grab <br />Other Pollutants of Concern <br />Various NA Various <br />Water Quality Standards <br />Weekly <br />Grab <br />Whole Effluent Toxicity (WE7) <br />Chronic <br />Stat Diff and IC25 > IWC <br />State Permit Limitations <br />Quarterly <br />3 Grab/Test <br />Acute <br />LC50 > 100% <br />State Permit Limitations <br />Grab <br />Footnotes 1-4. •, • •, and • • • - See Footnotes under Table 111-1 and Table 111-2 <br />