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MINREC, INC. AHR PAGE 4 <br />Anticipated Impact - North Thompson Creek NTC - 2010 <br />Outfall 001 <br />Flow gpm Conductivity <br />Outfall 001 NTC Flow <br />cfs Conductivity <br />NTC Conductivity <br />Combined % Increase <br />(Decrease) <br />10 2027 5 494 501 1.4 <br />15 2027 5 494 504 2.1 <br />20 2027 5 494 508 2.7 <br />25 2027 5 494 511 3.4 <br />26.7 2027 5 494 512 3.6 <br />30 2027 5 494 514 4.1 <br />35 2027 5 494 518 4.8 <br />40 2027 5 494 521 5.4 <br />Conductivity Outfall 001 - umhos/cm - Average for 2010 <br />The average flow during 2010 of 26.7 gpm with a conductivity of 2027 discharging into a <br />receiving stream with a 5 cfs flow and a conductivity of 494 (pre-permit mean) would <br />increase the conductivity of the receiving stream to about 512 umhos/cm, an increase of <br />about 3.6% 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 day <br />is considered a no-salt discharge by the Department of Health. A flow rate of 100 gpm <br />from with a TDS concentration of 1500 mg/I would yield a salt concentration of 0.9 tons per <br />day, slightly below the one ton per day of salt discharge limitation. The average flow rate <br />at Outfall 001 was 26.7 gpm with a TDS concentration of 1419 mg/I during 2010 which <br />equates to a discharge of 0.23 tons of salt per day.