2011-10-24_PERMIT FILE - C1983059

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.._•. ,. ,_ ~ L ~. ii •.. ~~ n, is .. ,. r.'"„1 ..i .. ~:~alc: ~ Page 8. PERMIT NUMBER: e.v~-nSUUUU Salinity . Regulation 3.10,0, Regulations for Implementation of the Colorado River Salinity Standards Through the Colorado Discharge Permit Program, adc.resses the discharge ~rf total dissolved solids (TDS) co the Colorado River Basir:. It is a reluirement of the regulation that the TDS level of each discharge in the Colorado River Basin be evaluated for impact on the system. Generally, the net impact of TDS to the basin from coal mining surface runoff treatment facilities is negligible due to the intermittent nature of the discharger. Nonetheless, the division reserves the right to refuse the certification to the general permit if it appears that the discharge will no[ be consistent with the regulations. Settline Agents Because of the wide variety of available chemical flocculants, the use of such settling aids must be subject to prior approval by the permitting authority. Additionally, if over-application of a ELocculan~ appears to be a problem, revocatior: of the general permit discharge certification may be warzanted. Phosohoru:: Individua'! permits will be required for any facilities in the Cherr}~ Creek Basin ups :ream of Cherry Creek Reservoir or in the Chatfield Basin orhich is defined as downstream of the USGS gage at Waterton Eor the South Platte River or in the Plum Creek drainage. This determination is based on controls , established (or in the process of being established) to maintain the phosphorus standard in Cherry Creek Reservoir and Chatfield Reservoir. The management plan for maintaining the phosphorus standard in Dillon Reservoir recommends total phosphorus monitoring for minor industrial discharges including coal mining facilities. Thet•efore phosphorus monitoring shall be required for those facilities which discharge into the Dillon Reservoir drainage. Individual certifications shall state if this requirement applies to the specific facility. If monitoring shows the facility to contribute significantly, the permittee mad be required to obtain an individual permit. MONITORIPIG FREQUENCIES: For acti~~e mining, pH, oil and grease and Elow monitoring is required by the permitter: on a weekly basis. TSS, total iron and settleable solid:; are to be monitorer! monthly. For pose-mining, pH, oil and grease, flow and :settleable solids a::e to be monitored monthly. The division requires less frequent monitoring for post-mining discharges because no activity takes plcice on site, reclamation including revegetation has begun anti therefore effluent quality should vary little. Quarterly TDS monitoring is required for all rischarges co the Colorado River Basin in compliance with the Colorado River Salinity Regulations.