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Ilk Mine <br />Table 54 <br />1996 Im acts of MCC Dischar es on the North Fork <br /> N orth Fork River U stream of Mine Ponds MB-1/MB-2R Discha es Mixed North Fork Downstream of Mine <br />Date Flow TSS TDS Tota! Fe pH Flow 7SS TDS Total Fe pH Flow TSS TDS Total Fe pH <br /> cfs) m /L (m /L m /L) SU) (cfs) (mg/L (mg/L m /L) SU) cfs) mg/L) (m /L) (m /L) (SU) <br />March 26 416 42 127 1.54 8.18 9.5 72 1485 2.26 8.72 425.5 43 157 1.56 8.19 <br />Aprilll 2010 168 316 9.85 7.94 4.5 122 1770 4.91 8.80 2014.5 168 319 9.84 7.94 <br />June 17 993 12 60 0.05 8.20 5.0 42 1430 0.65 8.74 998 12 67 0.05 8.20 <br />July 31 247 7 110 0.13 8.31 5.0 140 2340 2.11 8.93 252 10 154 0.17 8.32 <br />October 7 69 5 90 0.13 8.09 5.0 32 2080 0.30 8.09 74 7 224 0.14 8.09 <br />Winter° 30 5 90 0.13 8.09 4.5 72 1485 2.26 8.09 34.5 14 272 0.41 8.09 <br />Worst Cases 30 5 90 0.13 8.09 9.5 72 2500 2.26 8.09 39.5 21 670 0.64 8.09 <br />The downstream wncen[razion was calculated as opposed to using the lower water quality station for two reasons. First, sampling did not always occur during the discharge; second, other factors <br />may contribute constituents between the upper and lower stations. <br />' Typical discharge rate from MB-1 is 5.0 cfs and from MB-2R is 4.5 cfs. A discharge rate of 9.5 cfs represents the rare occurrence when both ponds were discharged simultaneously. <br />' The stream standard for total iron is 1.0 mg/L <br />° The winter conditions scenario represent a hypothetical siNation; winter low flow in the North Fork and discharge from MB-2R or from the N W Panel sealed sump [o Lone Pine Gulch. <br />' The Worst Case re resents a h olhetical situazion; winter low Bow in [he North Fork and dischar a from both sedimentation onds <br />2.05-235 Revised June 2005 PRIG; Rev. March 2006; Rev. Miry 2006 PRIO <br />