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COLORADO DEPARTMENT OFPUBLICHEALTHAND ENVIRONMENT, Water Quality Control Division <br />Rationale, Page S, COG-0850000 Coal Mining General Permit <br />Table III-3a: Effluent Limitations and Monitoring Requirements -Post Mining reclamation Areas <br />Limitations <br /> <br />Parameter 30-Day 7-Day Daily <br />Rationale Monitoring <br />Frequency l <br />Avg. Avg. Max. <br />__________________________________WGeneral Permit Requirements-----------_______~________ ______ <br />Flow, MGD <br />Report NA Report <br />Discharge Evaluation Continuozts / <br />1 <br /> Instantaneous <br />pH, s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly <br />Total Suspended Solids, mg/1 30 4S NA State Effluent Regulations Weekly <br />Oil and Grease, mg/1 N/A NA 10 State Effluent Regulations Weekly <br />-----------------------------------Federal Effluent Limitation Guidelines----___________________________ <br />Settleable Solids, ml/1 Report NA O.S Federal ELG Weekly <br />________________________________W____Site Specific Limitations--- --------------------------- --_____ <br />Total Dissolved Solids, mg/l * Report NA Report Salinity Regulations Quarterly a <br />Total Phosphorus (as P), mgR ** Report NA Various Control Regulations Monthly <br />Total Recoverable Iron, ug/1 *** <br />Other Pollzttants of Concern <br />Whole Effluent Toxicity (WET) <br />Chronic <br />Acute <br />• <br />1000 NA NA Water Quality Standards <br />Various NA Various Water Quality Standards <br />Stat Diff and IC25 > IWC State Permit Limitations <br />LCSO > 100% State Permit Limitations <br />Weekly <br />Weekly <br />Quarterly <br />Sample <br />Type <br />Recorder / <br />In-situ z <br />Grab <br />Grab <br />Visual 3 <br />Grab <br />Grab <br />Grab <br />Grab <br />Grab <br />3 Grab/Test <br />Grab <br />Footnotes 1-4, *, **, and "** - See Footnotes under Table III-I and Table III-2. <br />Alternate Limitations For Post-Mining Reclamation Areas -Table III-3b contains limitations for any discharge or <br />increase in the volume of a discharge from a reclamation area, caused by precipitation within any 24-hour period <br />greater than the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) "z~ substitute the following <br />limitations for these speck parameters only, subject to burden ofproof requirements described in Part I.B.4 of the <br />permit. <br />Table III-3b: Alternate Effluent Limitations and Monitoring Requirements -Post Mining reclamation Areas <br />Limitations , <br />Parameter' 30-Day 7-Day Daily Rationale- Monitoring Sample <br />.Frequency Type. <br />Avg.. Avg. - Max. , <br />__w___________M~___________FederalEffluentLimitation Guidelines-----_~~__________~_~______ <br />Settleable Solids, ml/1 Report NA Report Federal ELG Weekly Grab <br />b. Post Mining Under~ound Areas -Table III-4 applies to this category, subject to 40 CFR Part 434 Subpart E (Post <br />Mining Areas). The following limitations apply to underground areas. The federal ELG limitations would apply until <br />bond release. If these wastewaters are combined with other waters under Part I.B.1, then those limitations shall apply. <br />If this wastewater is combined with post mining reclamation area wastewater, then these limitations apply to the <br />combined discharge. If the post mining wastewater is separate, then the following limitations apply. Discharges of mine <br />drainage from underground workings of underground mines which are not commingled with discharges eligible for <br />alternate limitations set forth in this section shall in no event be eligible for the alternate limitations set forth in this <br />section. <br /> <br />