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amount of suspended material may be carried <br />downstream during the initial construction of the <br />diversion, but this will not cause ercessive <br />sedimentation downstream. Once the river flows into <br />the a>:cavated area, the velocity will be reduced, <br />thereby depositing the suspended material before the <br />river loins the present channel at the north end of <br />the property. At the conclusion of excavation <br />during Phase II, once the riprap has been placed RQ./~~'e <br />around the cottonwood tree area and the erosion . S~ ~e <br />control structure placed along the east low-water <br />channel, the temporary diversion will be removed and <br />the existing berm restored to its present condition. <br />A small amount of suspended material may be carried <br />downstream while the berm is being restored, but <br />once the river is flowing into the Phase II <br />excavated area, the suspended material will again be <br />deposited before leaving the property. Neither <br />event will cause e>:cessive sedimentation downstream. <br />Cv.l(7y~~SP - e. Two forty-eight inch culverts will be placed in <br />,~7~t /e t-~ iw the bottom of the F'hase I e>cavated area so that <br />g the loader and/or trucks may cross to the Fhase II <br />fl~6 <br />5 9~ ~ r/ ~ la~ea,w' hout disturbing the flawing river. <br />~ :- N.~,6~ rif <br />Exhibit C - Mining Plan <br />• 1_~There is no waste rock on top of the deposit or within <br />the deposit. All material excavated will be used for road base <br />or fill offsite, or for reclamation and/or the berm or <br />diversion structures ^nsite. <br />2.~he permit area has been revised to include the <br />equipment storage/warehouse area as described in Exhibit B - <br />Site Description, Item 1. The south boundary has been moved <br />to the north approximately 100 ft so that the permitted area <br />remains less than 10 acres (9.8 acres m/1). See Exhibit E - <br />Map . I / <br />3". Please refer to the enclosed Huckhorn Geotech analysis <br />dated February 10, 1942. <br />4. The described mining plan is designed s^ that any <br />effects to water quantity or quality will be slight and <br />temporary. As discussed in above Item S, Er.hibit B - Site <br />^escription, water quality will not be diminished by siltation. <br />Excessive downstream sedimentation will not result from the <br />berming, channeling or excavation since areas, which have the <br />potential of providing finer material that can become <br />suspended, are controlled by riprap or a rail/wire structure. <br />Head-cutting and/or bank erasion are both controlled by these <br />measures. Downstream scouring will be very slight, as <br />• discussed by Euckhorn, since the velocity of the river as it <br />re-enters the existing channel to the north is very close to <br />the present bank-full velocity. <br />Page 3 <br />