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REP15015
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Last modified
8/24/2016 11:44:41 PM
Creation date
11/27/2007 1:34:12 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
Report
Doc Date
6/3/2005
Doc Name
2004 AHR Response Part 2
Annual Report Year
2004
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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J <br />RAG Empire Corporation, Eagle Mine Water Quality Assessment CO-0034142 <br />~ata from 1989 through 1999 were available from the gage station. The gage station and time <br />frames were deemed the most accurate and representative of current flows and were therefore used in <br />this analysis. <br />~_ . <br />During the months of May.and June, the acute ]ow flow calculated byDFLOW exceeded. the chronic <br />]ow flow. In accordance with WQCD standard procedures, the acute low flow was thus set equal to. <br />the chronic ]ow flow for these months. <br />IV. Technical Analysis <br />- Low flows and in-stream background data evaluated in sections II and III aze ultimately used to. <br />determine the assimilative capacity of the Williams Fork River for pollutants of concem..For all., <br />pazameters except,ammonia, it is the WQCD's approach to conduct a technical analysis of stream ., <br />assimilation capacityusing the lowest ofthe monthlylow flows (ieferred to as the annual ]ow flow) <br />as calculated in the Iow flow analysis. For ammonia, it is the standazd procedure of the WQCD.to <br />determine assimilative capacities foz each month using the monthly ]ow flows calculated in the low <br />flow analysis, as the regulations allow the use of seasonal slows when establishing assimilative <br />capacities. <br />The WQCD's standard analysis consists of steady-state, mass-balance ,calculations for most <br />pollutants and modeling for pollutants such as ammonia. The mass-balance equation is used by the <br />WQCD to calculate the maximum allowable concentration ofpollutants in the effluent, and accounts <br />for the upstream concentration of a pollutant, critical ]ow flow (minima] dilution); effluent flow and <br />the water quality standard. The mass-balance equation is expressed as: <br />Mz = M3Q3-M~Q~ =~. <br />Q~ . <br />where: <br />Ql =Upstream ]ow flow (lE3 or 30E3) <br />Q1=Average daily effluent :low (design capacity) <br />Appendix A Page 8 of 13 <br />Based on the ]ow flow analysis described previously, the upstream low flows available to the Eagle <br />Mine discharges aze presented in Table-A-6. <br />
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