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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 IH-4: Effluent Limitations and Monitoring Requirements -Post Mining reclamation Areas <br /> Limitations Monitoring Sumple <br />Yorameler 30-Da v 7-Day Dail), Rationale r <br />Frequency <br />Tlpe <br /> <br /> General Permit Requirements <br />Flow, MGD <br />Report NA Report <br />Discharge Evaluation Continuous / <br />Instantaneous' Recorder l <br />In-situ ' <br />pH, s.u, N/A NA 6.5-9.0 Water Quality Standards Weekly Grab <br />l s <br />V <br />Oil am; ..grease, mg// N/A NA 10 State Effluent Regulations Weekly isua <br /> Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg11 35 NA 70 Federal ELG Weekly Grab <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 />Settleable Solids, m117 Report NA 0.5 Federal ELG Weekly Grab <br />. <br />Total Dissolved Solids, mg/1 * Site Specific Limitations <br />Report NA Report <br />Salinity Regulations <br />Quarterly 4 <br />Grab <br />Total Phosphorus (as P), mg17 Report NA Various Control Regulations Monthly Grab <br />Total Recoverable Iron, ug/I *** 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 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 *** - See Footnotes under Table 111-1 and Table I11-2. <br />5. Effluent Limitations and Monitoring _Requirements - Acid or Ferruginous Mine Drainage - Tables 111-5a 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-Sa: Effluent Limitations and Monitoring Requirements - Acid or Ferruginous Mine Drainage <br /> Limitations vlvnituring Sample <br />:Parameter 30-©qv- 7-Day Daily Rationale <br />Frequency <br />TJ'pP <br /> Avg._. <br /> General Permit Requirement <br />Flow, MGD <br />Report NA Report <br />Discharge Evaluation Continuous / <br />Instantaneous' Recorder / <br />In-situ' <br />pH, s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly Grab <br />l 3 <br />V <br />Oil and Grease, mg11 N/A NA 10 State Effluent Regulations Weekly isua <br /> Federal Effluent Limitation Guidelines <br />Total Suspended Solids, mg/7 35 NA 70 Federal ELG Weekly Grab <br />'metal Manganese, mg/1 2.0 NA 4.0 Federal ELG Weekly Grab <br />7°otal Iron, mg11 <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 />Settleable Solids, m111 Report NA 0.5 Federal ELG Weekly Grab <br /> Site Specific Limitations <br />Total Dissolved Solids, mg/1 * Report NA Report Salinity Regulations Quarterly 4 Grab <br />Total Phosphorus (as P), mg/7 ** Report NA Various Control Regulations Monthly Grab <br />Total Recoverable Iron, ug/I *** 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 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 *** - See Footnotes under Table III-1 and Table 111-2.