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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 />Table III-4: E went Limitations and Monitoring Requirements -Post Mining reclamation Areas <br />ffl <br />- <br />• <br />, <br />Limitations <br />Monitoring <br />Sample <br />Parameter 30-Day 7-Day Daily Rationale f requency 7)7?e <br /> Avg. -4 L-AmaiL, <br /> General Permit Requirements- Continuous / Recorder l <br />Flow, MGD Report NA Report Discharge Evaluation Instantaneous' In-situ `' <br /> N/A NA 6.5-9.0 Water Quality Standards Weekly Grab <br />l 3 <br />pH, s. u. <br />Oil and Grease, mg/1 N/A NA 10 State Effluent Regulations Weekly Visua <br /> Federal Effluent Limitation Guidelines <br />G <br />Weekly <br />Grab <br />Total Suspended Solids, mg/7 35 NA 70 Federal EL <br />Total Iron, mg/1 <br />Existing Sources (before 514184) <br />3.5 NA 7.0 <br />Federal ELG <br />Weekly <br />Grab <br />New Sources (after 514184) 3.0 NA 60 <br />5 <br />NA 0 <br />Federal ELG <br />Weekly <br />Grab <br />Settleable Solids, niO . <br />Report <br /> <br />Total Dissolved Solids, mg/1 ' Site Specific Limitations <br />Report NA Report <br />Salinity Regulations <br />i <br />l e <br />Quarterly <br />Monthly <br />Grab <br />Grab <br />Total Phosphorus (as P), mg/7 Report NA Various ons <br />at <br />Control Regu b <br />G <br />Total Recoverable Iron, ug/I *'* 1000 NA NA Water Quality Standards Weekly ra <br />b <br />G <br />Other Pollutants of Concern Various NA Various Water Quality Standards Weekly ra <br />Whole Effluent Toxicity (WET) <br />Chronic <br />Stat Diff and IC25 > IWC <br />State Permit Limitations <br />Quarterly <br />3 Grab/Test <br />Acute LC50 > 100% State Permit Limitations Grab <br />Footnotes 1-4, •, ", and •" - See Footnotes under Table III-1 and Table III-2. <br />Effluent Limitations and Monitoring Requirements -Acid or Ferruginous Mine Drainage - Tables III-5a through III-5e <br />5 <br />. <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 Requirements - Acid or Ferruginous Mine Drainage <br /> Limitations Monitoring Sample <br />Parameter 30-Day 7-Da i> Daily Rationale Frequency t 1)' <br /> <br /> General Permit Requirements Continuous / Recorder / <br />Flow, MGD Report NA Report Discharge Evaluation Instantaneous In-situ ' <br />H N/A NA 6.5-9.0 Water Quality Standards Weekly Grab <br />l 3 <br />, s.u. <br />p <br />Oil and Grease, mg11 <br />N/A NA 10 <br />State Effluent Regulations <br />Weekly <br />Visua <br />Federal Effluent Limitation Guidelines <br />G <br />Weekl <br />Grab <br />Total Suspended Solids, mg/7 35 NA 70 <br />0 <br />NA 4 Federal EL <br />Federal ELG y <br />Weekly Grab <br />Total Manganese, mg/? . <br />2.0 <br />Total Iron, mg/1 <br />Existing Sources (before 514184) <br />3.5 NA 7.0 <br />Federal ELG <br />Weekly <br />Grab <br />New Sources (after 514184) 3.0 NA 6.0 <br />5 <br />NA 0 <br />Federal ELG <br />Weekly <br />Grab <br />Settleable Solids, m111 . <br />Report <br /> <br />mg17 * <br />Total Dissolved Solids Site Specific Limitations <br />Report NA Report <br />Salinity Regulations e <br />Quarterly <br />Grab <br />b <br />G <br />, <br />Total Phosphorus (as P), mg/1 ** Report NA Various Control Regulations Monthly ra <br />Total Recoverable Iron, ug17 *** 1000 NA NA Water Quality Standards Weekly Grab <br />Other Pollutants of Concern Various NA. Various Water Quality Standards Weekly Grab <br />Whole Effluent Toxicity (WET) <br />Chronic <br />Stat Diff and IC25 > IWC <br />State Permit Limitations <br />Quarterly <br />3 Grab/Test <br />Acute LC50 > 100% State Permit Limitations Grab <br />Footnotes 1-4, *, **,and ***-See Footnotes under Table III-1 and Table 111-2.