1987-12-01_PERMIT FILE - C1981017 (185)

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Chapter IV Water released from settling ponds will not exceed an average monthly total suspended solids concentration of 30 mg/I nor a daily maximum of 70 mg/I. During wet conditions this limit is 0.5 mg/I settleable solids. The pond discharges are not required to meet the effluent limitation where it can be demonstrated to the regulatory authority that the flow results from a storm are greater than the 10 year /24 hour frequency. 8. Monitoring and Reporting. a. General. Mid - Continent monitors and reports surface and groundwater in compliance with National Pollutant Discharge Elimination System (NPDES) effluent requirements and the Colorado River Salinity Standards (CRS), 1973 as the basis for evaluating the effect the mine operations may have on surface and ground water quality and quantity. During the preceding permit term, TR-4, approved Aug. 11, 1986, allowed for modification of the water monitoring program. As approved, samples are taken during peak flow, in June, and low flow, in October. The hydrograph in Fig. IV -C -1 shows mean monthly flow. Station No. 2 Sutey- Spring Creek (refuse pile underflow) was added to the sample list for 1986 -1987 to observe any possible changes in the quality or quantity associated with the expansion of the Sutey refuse pile, including the extension of the underdrain. The parameters for analysis of surface water and ground water include: Field: Lab: Flow or water surface level Bicarbonate Temperature Sulfate pH Sodium Conductivity Calcium Chloride Magnesium SAR IRON TDS TSS* * Surface water only. * ** Monitoring Sites Ground Water Surf Water P -1 No. 6 No. 20, Coal Creek P -2 No. 9 No. 3, Bear Creek P -3 No. 11 No. 5, Dutch Creek P -5 GE -1 No. 1, Disney Creek P-6 GS -1 No. 3, Sutey Creek & P -7 GW -1 Sutey Underdrain P-8 AT -2A AT -2B 21