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MINREC, INC. AHR PAGE 5 <br />Anticipated Impact - North Thompson Creek NTC - 2012 <br />Outfall 001 <br />Flow gpm <br />Conductivity <br />Outfall 001 <br />NTC Flow <br />cfs <br />Conductivity <br />NTC <br />Conductivity <br />Combined <br />% Increase <br />(Decrease) <br />10 <br />2202 <br />5 <br />494 <br />502 <br />1.5 <br />15 <br />2202 <br />5 <br />494 <br />505 <br />2.3 <br />20 <br />2202 <br />5 <br />494 <br />509 <br />3.1 <br />25 <br />2202 <br />5 <br />494 <br />513 <br />3.8 <br />25 <br />2202 <br />5 <br />494 <br />513 <br />3.8 <br />30 <br />2202 <br />5 <br />494 <br />517 <br />4.6 <br />35 <br />2202 <br />5 <br />494 <br />520 <br />5.3 <br />40 <br />2202 <br />5 <br />494 <br />524 <br />6.1 <br />Conductivity Outfall 001 - umhos /cm - Calculated for 2011 <br />An average flow of 25.0 gpm with a conductivity of 2202 discharging into a receiving stream <br />with a 5 cfs flow and a conductivity of 494 (pre - permit mean) would increase the <br />conductivity of the receiving stream to about 513 umhos /cm, an increase of about 3.8% <br />which is considered insignificant. <br />The Colorado Department of Public Health and Environment has regulations regarding <br />saline discharges into the Colorado River. A discharge of less than one ton of salt per <br />day is considered a no -salt discharge by the Department of Health. Please refer to <br />Regulation 61 for a discussion of the one ton of salt per day issue. A flow rate of 100 <br />gpm from with a TDS concentration of 1500 mg /I would yield a salt concentration of 0.9 <br />tons per day, slightly below the one ton per day of salt discharge limitation. A flow rate <br />of 25 gpm with a TDS of 1500 mg /I would introduce 0.23 tons of salt per day into North <br />Thompson Creek. <br />