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(~ - 8 - \ The potential for any effect on surface water quality and quantity in East Salt Creek was discussed above. Even though the potential for impact is mini- mal, Salt Cteek :lining Company has proposed to establish a monitoring network to verify these projections and would identify any detrimental effects that may occur. This monitoring network will be established to detect changes in surface and ground water within the alluvial valley floor. Probable Hydrologic Consequences and Cumulative Impacts. The McClane Canyon Mine will have very limited impact on the surface and ground water hydrology of the hydrologically adjacent area. Any impacts on surface water quantity and. quality will be limited because of the small area of drainage impacted by the operation. Also because the operation may only exist for this permit term, and impacts will be limited with respect to time. After the area is reclaimed, the hydrologic characteristics of the alluvial system will be restored. The surface disturbance in ricClane Canyon will have very little impact on wa- ter quantity and quality_of East Salt Creek. :Only .OIX of. [he draioage.area • contributing to the flow at the confluence of HcClane Canyon~and•East Salt Creek will be affected. by the operation. The disturbance of less than lz of the contributing drainage area is insignificant in itself and will have a min- imal impact on the hydrologic characteristics of the East Salt Creek system. Runoff contained within the sedimentation system will be insignificant with respect to flow in East Salt Creek. Water will be retained within the sedi- mentaton pond until it meets NP-ES and Mined Land Reclamation effluent stand- ards. _. ___ _ _ . ... _ _E: -fi__ _. _ _. __. Impacts on groundwater could occur in two ways; 1) through the effect of the mine workings on geologic ground water and 2) through the effect of the sur- • face disturbance on alluvial ground water in East Salt Creek. In either case, , the mine is not expected to have a signifcant effect on ground water quantity. The alluvial ground water system in East Salt Creek could be impacted as a re- -''` salt of the surfacetdistur~bap.ce,.~n ~1gClape Canyon. Any impact incurred, how- ever, would. be. as .a. result. of the effect of the mine on surface water. .There '. i is no other mechanism for recharge of the alluvium which will be affected by the operation. Furthermore, the potential for an effect on the alluvial sys- tem as a result of alteration of the surface flow will be insignificant. If the recharge of the aquifer were solely dependent on surface flow the signifi- cance of the disturbed area with respect to flow in the alluvium would be neligible. ~ All waters which could be potentially impacted by the operation will be moni- tored for any adverse impacts. Surface water monitoring sites are located up- stream and downstream of the disturbance so that any detrimental impacts will be determined. Ground water alluvial wells have been established upgradient and downgradient of ticClane Canyon along East Salt Creek to monitor the ef- fects of mining. Changes in flow and water quality parameters will be mea- • sated at all of these monitoring sites. The total surface disturbance created by the licClane Canyon operation will be contained within a sedimentation system and is approximately 7.7 acres. This