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-14- <br />\`_' <br />lative Impacts Assessment - <br />The alluvial ground water system in East Salt Creek could be impacted as a <br />result of the surface disturbance in PlcClane Canyon. 'Any impact incurred, <br />however, would be a result of the effect of the r„ine on surface water. There <br />is no other mechanism for recharge of the alluvium which will be affected <br />by the operation. Furthermore, the potential for an effect'on the alluvial <br />system as a result of alteration of the surface flow will be insignificant. <br />If the recharge of the aquifer were solely de?endent on surface flaw the <br />significance of the disturbed area with respect co flow in the alluvium wou13 <br />be.negligible. <br />All waters which could be potentially impacted by the operation will be <br />monitored for any adverse impacts. Surface water monitoring sites are located <br />upstream and downstream of the disturbance so that any detrimental impacts- .. <br />-" _ will Tie-determined. Ground water alluvial yells have been established <br />upgradient and downgradient of PlcClane Canyon along East Salt Creek to monitor <br />the effects of mining. Changes in flow and water quality parameters will <br />be measured at all of these monitoring sites. <br /> <br />Salt Creek ;fining Company also has applied for a permit to mine in Munger <br />Canyon, (see Mined Land Reclamation File $C-020-81) one mile south of <br />McClane Canyon. The mine is an underground mine with the face up and <br />facilities in a canyon at the headwaters of a tributary to ?funger Canyon. <br />The face up is located approximately tsra miles from the intersection of <br />Munger Canyon .and East Salt Creek Caapon. <br />The Munger Canpvrr Miae atll also affect the quantity and quality of surface <br />water in East Salt Creek. This effect would occur as a result of the surface <br />disturbance at the mine and the impact this disturbance will have on runoff <br />and surface flow in Munger Canyon. <br />The total surface disturbance created by the:icClane Canyon operation which <br />will be contained within a sedimentation system is approximately 7.7 acres. <br />This accounts for less than two-tenths of a percent of the area contained <br />within the Munger Canyon drainage (5,085 acres), and one one-hundredth of <br />a percent of the total drainage area of East Salt Creek above the confluence <br />with lfunger Canyon (67,228 acres). Both Munger and McClane Canyons (42.7 <br />acres) will only affect six-hundredths of a percent of the drainage area <br />of East Salt Creek. <br />As indicated, the combined, or cumulative, impact on flow in East Salt <br />Creek as a result of the operations at HcClane and iiunger Canyons will be <br />relatively insignificant. All flow occurring outside of the disturbances <br />will be routed around them and returned to the drainage. Runoff produced <br />from the disturbed areas will be contained in sedimentation ponds for a <br />sufficient enough time to meet NPDES and ;fined Land Reclamation effluent <br />standards, and will then be released into the drainage. <br /> <br />