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complete the patch work. Drying can be accomplished by diverting the river through the <br /> diversion return flow gate. The patches should be cured before flow over the diversion resumes. <br /> The cracked gate mechanisms should be welded and the gate lowered (Photo 3). Although the <br /> other gate mechanisms are undamaged, it is recommended for wheel and worm gear mechanisms <br /> that are safer and easier to operate,be installed. <br /> The void at the toe of the diversion should be backfilled with large rock and covered with <br /> smaller cobble and sand to stabilize the toe of the diversion. The same fill should be used in the <br /> scour hole at the south end of the diversion(Photo 5). <br /> Revised Embankment Washout Designs <br /> Engineering designs for the washed out areas that occurred along the ditch to the northeast of the <br /> Highway 34 bridge have been revised since the recommendations letter on the 16th of October. <br /> The original plan called for approximately 535 cubic yards of fill to be placed with in the washed <br /> out sections by carefully building the slope back up in 1 foot -compacted lifts with 4 foot <br /> benches. This plan became unfeasible due to the cost and transport distance of appropriate <br /> backfill materials, coupled with unsafe access to the washed out sections. The revised plan is to <br /> re-align the Louden ditch and access road about 50 feet to the north, cutting across the corner <br /> where the washed out sections are located (Figure 1 and Sketch 1). The ditch access road will <br /> then be located on an existing stable surface, away from the washed out sections. The excess <br /> material from this re-alignment will be used as miscellaneous fill material in the washed out <br /> sections. <br /> The material present in the area of excavation for the new Louden Ditch alignment needs to be <br /> evaluated for its composition. Depending on the composition of the material the new section of <br /> ditch may require a bentonite liner, or other methods to prevent leakage. The new alignment of <br /> the ditch will allow for a shallower grade, which will slightly increase flow depth from its past <br /> alignment through that section. <br /> When all earth work has been completed a native grass seed should be planted in the area for <br /> added hill slope stabilization. <br /> Please contact Walt Niccoli, wniccoli@telesto-inc.com or April Tischer, atischer@telesto- <br /> inc.com with any questions or concerns, 970 484 7704. <br /> Sincerely, <br /> Telesto Solutions,Inc. <br /> Parker Scherman <br /> Geologist <br />