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Evaluation of Potential Impacts <br />From The Proposed Nix Property Sand and Gravel Operation <br />On Shallow Groundwater Levels, Water Wells and Wetlantls <br />3. Provide supplemental water from mining azeas if feasible. <br />4. Assess other methods to increase saturated thickness in the azea of the affected well (i.e., <br />create rechazge pits with water delivered from the pits, ditch rights, etc.). <br />6.2 Wetlands <br />The following measures aze proposed to mitigate for any impacts to wetlands. <br />1. Excavation of Area 1 should occur first to the approximate limit ("berm") shown on <br />Figure 6. This will create an upgradient lake with a lake surface elevation greater than <br />that of the wetland. A pipe/ditch should be constructed to deliver water from Area 1 to <br />the wetland slough at the most upgradient (highest) point possible. <br />Water levels in the wetland, including surface water levels in the slough, should be <br />monitored. If monitoring shows larger than anticipated reductions in water levels in the <br />wetland, then water should be delivered from Area 1 in the pipe/ditch to the wetland. The <br />slough is relatively flat. Maintenance of the existing water level in the slough should <br />stabilize hydrologic conditions in the wetland since the slough buffers the hydrology of <br />the wetland. (This recommendation is shown as proposed "mitigation Item 1" on Figure <br />6.) <br />2. Additional stop logs should be added to the water control box in the slough to assure <br />adequate "back-up" of water. This is shown as "mitigation Item 3" on Figure 6. <br />3. While Area 1 is being excavated, Owens Bros. should deliver shazes that it owns in the <br />Last Chance Ditch to the easternmost lateral to the slough via the Side Hill Ditch, if <br />monitoring data shows the wetland is becoming drier. Anew headgate with a connection <br />to the lateral is needed. The cost for delivering this water should be borne by Owens <br />Bros. This interim measure, which will stabilize the hydrology of the wetland, is <br />011-074.000 Wright Water Engineers, Inc. Page 16 <br />April 2002 <br />