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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale - Page 11, Permit No. CO-0000906 <br />uent Avg. Limitations i yte a JWax <br />'T'able VI-9 -Ground Water Monitorin Wells OSOB, OSOC and 05030 Day <br />ort ab/ <br />Parameter Report ab/ Re P <br />Static Water Elevation in well, ft above sea level Report ab/ NA <br />Specific Conductance, dS/m Report ab/ NA <br />Temperature, °C NA 6.5 ac% 8.5 ad/ <br />H s u (minimum-maximum) / 23 <br /> <br />p , - ' <br />Total Coliform, no/100 ml 2.2 e <br />10 <br />Dissolved Nitrate plus Nitrite as N, mg/l 250 <br />Dissolved Chloride, mg/I 250 <br />Dissolved Sulfate, mg11 Report b/ <br />Total Dissolved Solids, mg11 50 <br />Dissolved Arsenic, ug/l 5 <br />Dissolved Cadmium, µg/1 <br />mium (combined tri +3 and hex +6 forms), µg/I <br />Ch 100 <br />ro <br />Dissolved 200 <br />Dissolved Copper, ug/l 300 <br />Dissolved Iron, ug/I 50 <br />Dissolved Lead, yg1l 50 <br />Dissolved Manganese, ug/1 50 <br />Dissolved Mercury, ug11 100 <br />Dissolved Nickel, ug/1 50 <br />Dissolved Selenium, ug1l 50 <br />Dissolved Silver, ug/1 2000 <br />Dissolved Zinc, µ911 <br />" Field Sample Analysis (see footnote in the permit) <br />bl In lieu of a limit, reporting is required <br />These limits are instantaneous minimum limits <br />tantaneous maximum limits <br />i <br />t <br />ns <br />These limits are <br />Multiple-Tube Fermentation Technique is used for an • <br />alysis <br />2. Discussion of Effluent Limitations for Surface Water Discharges <br />a. Applicable Federal E uent Guidelines and Standards - The federal guidelines that apply to this type of facility are <br />found under 40 CFR Part 434, titled Coal Mining Point Source Category. The limitations that apply are: <br />Table VI-8 -- Federal Standards 40 CFR Part 434 Limitations <br />Parameter 30 Day Avg Concentration Daily Max. Concentration <br />6.0-9.0 <br />pH, s.u. (minimum - maximum) 35 70 <br />Total Suspended Solids, mg11 <br />Total Iron, mg11 * 3.5 7.0 <br />BAT** 3.0 6.0 <br />NSPS * * * N/A 0.5 <br />Settleable Solids, ml <br />• * These parameters subject to Burden of Proof Requirements, see next section <br />** Best Available Technology -applies to those ponds already constructed <br />*** New Source Performance Standards - applies to those ponds constructed after 514184 <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />Report b/ <br />mine 01/01/11) <br />Rationale <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />Groundwater Protection <br />The TSS and Iron (BAT) limitations ?jo the most the moststri?genaa?Outfalls 004Ae 007A1au008A and are imposed immediately. are esblishd at The settleable solids' limitations a