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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale, Page 6, COG - 0850000 Coal Mining General Permit • <br />TableII1 --4: Effluent Lim_ itations and Moriitorin Regi rements PostMinin reclamation Areas <br />#404 le i F t �J�Y.Y <br />__ ____— __- -- _-- __ - - - - -- General Permit Requirements-------------- <br />Flow, MOD Continuous / <br />Report NA ' Report Discharge Evaluation Irtstantarteous <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 />- r _,--__ —+ - -- Federal Effluent Limitation Guidelines------- - - - - -- ____W__w <br />Total Suspended Solids, mg/1 35 NA 70 Federal ELG Weekly <br />Total Iron, mg/1 <br />• Existing Sources (before 5/4/84) 3.5 NA <br />New Sources (after 5/4/84) 3.0 NA <br />Settleable Solids, rn1/1 Report NA <br />----- --- - - - - -- ------------ - - - - -- -Site Specific i <br />Total Dissolved Solids, mg/1 * Report NA <br />To fal Phosphorus (as P), ntg/l * * Report NA <br />Total Recoverable Iron, ug/1 * ** 1000 NA <br />Oth,'er Pollutants of Concern Various NA • Whole Effluent Toxicity (WET) <br />Chronic <br />• Acute LC50 > 100% <br />Flow, MGD <br />pH, s.u. <br />Oil and Grease, mg/1 <br />Total Suspended Solids, rng/1 <br />Total Manganese, mg/l <br />Total Iron, mg/1 <br />- Existing Sources (before 5/4/84) <br />New Sources (after 5/4/84) <br />Settleable Solids, rnl /1 <br />Total Dissolved Solids, mg/1 * <br />Total Phosphorus (as P), mg/1 ** <br />Total Recoverable Iron, ug/1 * ** <br />Other Pollutants of Concern <br />Whole Effluent Toxicity (WET) <br />Chronic <br />Acute <br />Stat Demand IC25 > IWC <br />Footnotes 1 - 4, *, * *, and * ** - See Footnotes under Table 111 and Table 111 - 2. <br />- 5. Effluent Limitations and Monitoring Requirements —Acid or Ferruginous Mine Drainage - Tables III-5a through III -5e <br />apply- to'this category, subject to 40 CFR Part 434 Subparts C (Acid or Ferruginous Mine Drainage). At a minimum, the <br />following limitations may apply as outlined in these subparts. <br />Table III-5a: Effluent Limitations and Monitoring Re uirements Acid or Ferruginous Mine Drainage <br />----- _______. __ —____— ______General Permit Requirements <br />N/A NA 6.5 -9.0 <br />N/A NA 10 <br />Federal Effluent Limitation Guidelines ----------------- ____— ______ <br />35 NA 70 Federal ELG Weekly <br />2.0 NA 4.0 Federal ELG Weekly <br />Report NA Report <br />3.5 NA 7.0 <br />3.0 NA 6.0 <br />Report NA 0.5 <br />- -- -Site Specific Limitations <br />Report NA Report <br />Report NA Various <br />1000 NA <br />Various NA <br />Report <br />Various <br />NA <br />Various <br />Stat Diff and 1C25 > IWC <br />LC50 > 100% <br />Footnotes I - 4, *, * *, and * * * See Footnotes under Table 111 - 1 and Table 111 - -2. <br />7.0 Federal ELG <br />6'.0 <br />0.5 Federal ELG <br />NA <br />Various <br />Salinity Regulations Quarterly 4 <br />Control Regulations Monthly <br />Water Quality Standards Weekly <br />Water Quality Standards Weekly <br />State Permit Limitations Quarterly 3 Grab /Test <br />Grab <br />State Perrnit Limitations <br />Continuous / <br />Discharge Evaluation Instarttarteous2 <br />Water Quality Standards Weekly <br />State Effluent Regulations Weekly <br />Federal ELG <br />Federal ELG <br />Salinity Regulations <br />Control Regulations <br />Water Quality Standards <br />Water Quality Standards <br />State Permit Limitations <br />State Permit Limitations <br />Weekly <br />Recorder / <br />In -situ 2 <br />Grab <br />Visual 3 <br />Grab <br />Weekly Grab <br />Weekly Grab <br />Weekly <br />Quarterly 4 <br />Monthly <br />Weekly <br />Weekly <br />Grab <br />Grab <br />Grab' <br />Grab <br />Recorder / <br />In -situ 2 <br />Grab <br />Visual 3 <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />Quarterly 3 Grab /Test <br />Grab <br />