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C. Stream Channel Diversions <br />1. Channel lining structures, retention basins, and artificial channel <br />roughness structures are proposed for use to control erosion. These <br />means are proposed to be approved by the Division since they are <br />necessary to control erosion, they are stable, and will require <br />infrequent maintenance. Channel lining structures and materials are <br />used as necessary to meet design requirements and performance <br />(4.05.4(2)(a)). <br />D. Sedimentation Ponds <br />No specific approvals granted. <br />E. Acid-forming and Toxic-forming Spoil <br />No specific approvals granted. <br />F. Impoundments <br />No specific approvals granted. <br />G. Surface and Ground Water Monitoring <br />Northfield has adequately characterized the surface and groundwater <br />environment in and around the site. Chandler Creek is an ephemeral <br />stream, flowing only in response to snow melt or rainfall events. Ground <br />water locally is minimal as evidenced by baseline data collected by <br />Northfield in wells NF-1, NF-2, and NF-3 and from well data presented in <br />records of registered wells in the permit and adjacent area. No regional <br />aquifers exist; rather groundwater is found in localized, perched aquifers <br />recharged by infiltration through fractures and jointing of the rock <br />formations. Tight, well cemented sandstones and shales limit permeability <br />and result in very limited well production, typically around one gallon per <br />minute. Although the groundwater resource is limited, it is nonetheless <br />very important to residential users upgradient of the planned mining area <br />especially since it is the only water locally available. Exhibit K of the permit <br />application provides technical details on the results of the hydrologic <br />studies completed at the site. <br />1. The applicant will conduct monitoring of groundwater in a manner <br />approved by the Division. The groundwater monitoring plan is as follows <br />(4.05.13(1)): <br />The groundwater monitoring plan is included Exhibit AB of the permit <br />application and well locations are shown on Map 13. Sections II, IV, VI, <br />17 <br />