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Evaluation of Potential Impacts <br />to Wetlands on the Sage Hill Farm from the <br />Proposed Nix Property <br />Sand and Gravel Operation <br />wetland since the slough buffers the hydrology of the wetland. (This recommendation is <br />shown as proposed mitigation item 1 on Figure 5.) <br />2. While cell 3A is being excavated, Owens should deliver shazes it owns in the Last <br />Chance Ditch to the easternmost lateral in the slough in the wetland via the Side Hill <br />Ditch. The cost for delivering this water should be borne by Owens. This interim <br />measure, which will stabilize the hydrology of the wetland, is recommended to avoid <br />delivering sediment-laden water to the wetland from cell 3A while it is being excavated. <br />(This recommendation is shown as mitigation item 2 on Figure 5.) <br />3. Water levels in the wetland, including surface water levels in the slough, should continue <br />to be monitored. If monitoring shows lazger than anticipated changes in water levels in <br />the wetland, additional measures to minimize hydrologic effects on the wetland should be <br />considered. It is recommended that an independent third party evaluate the monitoring <br />data. <br />In summary, delivery of water to the sough, as is recommended, will maintain the status quo of <br />existing wetland hydrology. Additional water provided will maintain water levels in the wetland, <br />and excess v~-ater will be drained off the wetland by the slough. It may be necessary for Owens <br />to modify the outlet of the slough to maintain its function. Access was not provided to WWE to <br />determine the nature and condition of the existing outlet. <br />C:\Ol I -074\020ard\REPORT. doc <br />' 011-074.000 Wright Water Engineers, Inc. Page 9 <br />November 2001 <br />