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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale, Page 2, COG-0850000 Coal Mining General Permit <br />B. Application <br />Dischargers can apply for coverage under this general permit once the permit is issued. Holders of certificatioennse adeetheit. y be trans <br />lprm <br />new <br />erred to this <br />administratively extended Coal Mining Permit (OOwt)thowill ut a lapsedof cooverage (i e. discharging without a p ?t) and <br />new te it <br />Their coverage will be transferred to the new general perm <br />ays, <br />loss offee payments. The havethe90 <br />or opera ?odof the site she all subm?lonetoriginal completed <br />conditions of this general permit. For <br />application and a copy, including a signed certification that the SWMP is complete at least thirty days prior tot the <br />commencement of mining activities. <br />111. EFFLUENT LIMITATIONS <br />A. General Effluent Limitations and Monitoring Requirements to the discharges covered, and are Numeric effluent limitations are imposed for pollutants thaFederal E cuent Guidelines for <br /> the applicable point sourcebles 111 I <br />through III-6. Some of these limits are based on the EPA o which category and are described below. The certification <br />s determined to be a sit e?peenfic polluttant of coni era maybe added tothee <br />of the discharge. Note that any parameter that <br />discharge certification. <br />1. Surfacunofl or Non-Coal Mining Related Wsstt_ treamsot ?arectly related to mining activities nations and monitoring <br />sites <br />requirements for wastewater from coal mining <br />Table III-1: Effluent Limitations and Monitoring Requirements for Outfalls Comprised of Surface Runoff or Non Coal <br />Mining Related Waste Streams <br />Limitations IVlonitoring Sample' <br />30-fkty 7-Day Daily Rationale Frequency t Tvpe <br />Parameter <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 GVrab isual s <br />pH, Oil s. u. N/A NA 10 State Effluent Regulations Weekly <br />Oil and Grease, mg/1 <br />Federal Effluent Limitation Guidelines Weekly Grab <br />Settleable Solids, mill Report NA 0.5 Report FeFedderal eral ELG ELG Weedy Grab <br />Settleable Solids, mill * Report NA Grab <br />Site Specific Limitations <br />Total Dissolved Solids, mg/l " Report NA Report Salinity Regulations Quarterly Grab <br />Total Phosphorus (as P), mg11 Report NA Various Control Regulations Monthly Grab <br />Other Pollutants of Concern Various NA Various Water Quality Standards Weekly uirements <br />days <br />to 2 <br />on an instantaneous basis Major fal cilities shalltmonito?ow weeklysminor facil ties 2 days / month month. <br />per I - Fora minor facility, as determined by the EPA <br />2 - /f power is not available, flow may be measured <br />3 - I fa visual sheen is noticed, a grab sample must be taken and analyzed for oil and grease <br />4 - Quarterly monitoring shall be prescribed if the limitation is based upon discharge to the Colorado River Basin. If the limitation is based upon agricultural <br />protection, the monitoring frequency shall be weekly. <br />+ If caused by precipitation within any 24-hour period greater than the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume will <br />certific <br />upon <br />ace <br />the The TDS limitation will normally apply tog discharges is dthe ischarge of salt. If the facility does not meet this requiremi nt, the fatty will be requiredto submit a sal nity River <br /> Bin. An evaluation ofthe facility liry meets the 1 ton/day or 350 tons/year or more information. <br />n Reservoir See Regulation Cherry reek and the <br />report documenting that achieving this level h discharge is noffeasible. <br />The phosphorus limitations apply discharges hectrespectively. at7hh rmiltee'may required to obtai a h sphoru alloca ion fromsthe app the <br />Creek Watershed, as defined in Regulattion 71, 72 7 or 74 <br />Bear e <br />control regulation authority prior to certification under this general permit. _• „' - i Y ^^^ l <br />2. Alkaline Drains a Coal Pre aration Plants and coal 1-re arai uri '"- -???• •- - Coa Minin - Tables III-a, III-b and III-c apply toAAlkaline De tables co al Phe reparatio 1 n Plants <br /> and <br />as well as al terna?e Plant <br />Associated Areas and Western Alkaline Coal Mining. Preparatio limitations based upon precipitation events. These categories are subject to 40 CFR Part 434 a lis B (Coal <br />also apply n <br />Plant and Associated Areas), D (Alkaline Mine Drainage) and F (Miscellaneous Provisions). The itations to <br />Western Coal Mining Operations. Additional limitationsfor Western outlined Coal in these Minin can bes.ound under Section III.A.3 of this <br />rationale. At a minimum, the following limitations may apply