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COLORADO DEPARTMENT OFPUBLICHEALTHAND ENVIRONMENT, Water Quality Control Division <br />Rationale Page 4. COG-0500000 Sand and Gravel General Permit <br />Table 111- S- Graphite (subpart AL) _7 <br />Effluent Parameter DischargeLimitations Rationale <br /> 30 D Avg 7 Da Av Dail Max <br />Flow, m d Report NA Report Discharge Evaluation <br />Total Suspended Solids, m g17 10 NA 20 Federal Effluent Guidelines <br />H, s.u. NA NA 6.5-9.0 Water Quality Standards <br />Oil and Grease, m g17 NA NA 10 State Effluent Regulations <br />Total Iron, m /l 1 NA 2 Federal Effluent Guidelines <br />Site s eci tc <br />Selenium, u /1 Various NA Various Water Quality Standards <br />Total Recoverable Iron, j/17--- 1,000 NA NA Water Quality Standards. <br />Dissolved Iron 300 NA NA Water Quality Standard <br />Metals, u /1 Various NA Various Water Quality Standards <br />Organics, ugli Various NA Various Water Quality Standards <br />Whole Effluent Toxicity E <br />Chronic Stat. Di & IC2S>IWC State Per"'tt Limitations <br />Acute LC50>100% State Permit Limitations <br />Total Dissolved Solids, in /1 Report NA 'Report Salinity Regulations <br />Total Phosphorus, m /1 Report NA 0.2-1.0 Control Regulations <br />Footnotes and **** can be found under Table III-1 <br />The water quality-based limit for dissolved fluoride applies only on Water Supply segments. The more stringent limit (WQS, ELG) will Apply. <br />Table 111- 6. Batch Plants-Concrete and Hot As halt <br />Effluent Parameter Discharge Limitations Rationale <br /> 30 Da Avg 7 Da Av Dail Max <br />Flow, m d Report NA Report Discharge Evaluation <br />Total Suspended Solids, m R 30 NA 45 State Effluent Regulations <br />pH, s. u. NA NA 6.5-9.0 Water Quality Standards <br />Oil and Grease, MR NA NA 10 State Effluent Regulations <br />Total Iron, m g17 1 NA 2 Federal Effluent Guidelines <br />Site s eci W <br />Selenium, ugX- Various NA Various Water Quality Standards <br />Total Recoverable Iron <br />Dissolved Iron <br />Metals, u /1 Various NA Various Water Quality Standards <br />Organics, ugfi Various NA' Various Water Quality Standards <br />Whole Effluent Toxicity E <br />Chronic Stat. Di & IC25>IWC State Permit Limitations <br />Acute LC50>100% State Permit Limitations <br />Total Dissolved Solids, mj Report NA Report Salinity Regulations <br />Total Phos horus, m R Report NA 0.2-1.0 Control Regulations <br />Footnotes *, **, ***, and **** can be found under Table III-1 <br />The water quality-based limit for dissolved fluoride applies only on Water Supply segments. The more stringent limit (WQS, ELG) will apply. <br />IV. EXPLANATION OF PERMIT LIMITATIONS <br /> <br />a. Regulations or Effluent Limitations (Regulation No 62) - Regulation 62.4 includes effluent limitations that apply to all discharges <br />of wastewater to State waters. These regulations are the basis for the oil and grease limitations and some of the total suspended <br />solids MS) limitations in the tables above. These regulations do not apply when there are federal Effluent Limitation Guidelines <br />associated with a facility. <br />b. Technology-Based Limitations (Federal Effluent Limitation Guidelines) -Federal Effluent Limitation Guidelines (ELG's) have <br />been promulgated for these facilities and must be applied to these discharges, unless a more stringent Water Quality Standard <br />exists. The Water Quality Standards in many areas of the state are often more stringent than the federal ELG's, and therefore <br />may be substituted in a certification. <br />c. Water Quality Standard-based Limitations (Discharges to Surface Waters)- Water quality-based limits are imposedforpH. <br />Water quality-based reporting may also be imposed for other pollutants of concern based on the discussion that follows.