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20. Culvert G-4 C' Via! 72S :C -recto fl 1 . HEadwa.t 2 c _ ._. <br /> Culvert G-13 gas cut uac< i , Lo " e roaa embanKment a. roan <br /> a result been reduced to approximately i5 feet. As an inter; ? measure , <br /> the outlet should be stabilized with large riprap. Long term remediation <br /> would probably require installation of a culvert downdrain and <br /> reconstruction of the road segment, or replacement of the culvert with a <br /> low water crossing. <br /> 21 . At Culvert G-1 , the downdrain pipe section is not welded to the initial <br /> segment of the 36 inch CMP, but is loosely attached with cable , and it <br /> appears that flow could escape the pipe at the juncture . <br /> Road F <br /> 22. Sediment form ditch cleanout had apparently been pushed into the <br /> ephemeral channel at the RD-5 outfall . This material should be removed <br /> from the channel to insure that any flow in the channel is not diverted <br /> down the exploration road at this location . <br /> 23. Culvert F-7N, shown on Att. 2, Plate 6, at Sta. 110+20, has not been <br /> installed. Instead, road drainage is conveyed approximately 1 ,500 feet <br /> to RD-4 discharge at second switchback. <br /> 24. The channel below the RD-4 outfall has downcut several feet deep for a <br /> distance of 200 to 300 feet down slope from the outfall to the road <br /> segment below the next switchback. <br /> 25. A gully averaging 2 to 4 feet deep has developed below Culvert F-6N on a <br /> fairly gentle, grassy slope. The gully extends for approximately <br /> 200 yards . The riprapped culvert outfall section appears stable. <br /> 26. The gully originating at the RD-4 outfall intersects the road ditch a <br /> short distance above Culvert F-3. The gully continues down slope form <br /> the Culvert F-3 outfall , and coalesces with another gully before <br /> intersecting the road ditch on the road segment below the next switchback. <br /> 27. A double 18" culvert set has been installed at approximately 83+00. The <br /> upper of the two culverts needs to be reset to avoid discharging into the <br /> side of the channel and causing additional erosion. The channel below <br /> this culvert set is severely eroded , similar to the gully below Culvert <br /> F-3. The 8 to 10 foot deep gully extends several hundred feet before <br /> joining with the gully below Culvert F-3 . The 20 foot outfall section <br /> below the culvert outlet will need to be riprap protected in accordance <br /> with the approved design. <br /> 28. A gully 3 to 6 feet deep by 3 to 5 feet wide has developed below <br /> Culvert F-5N. The gully extends approximately 200 feet down to the road <br /> segment below the next switchback, at Culvert F-2 . The outfall section <br /> immediately below the culvert outlet will need to be riprapped in <br /> accordance with the approved design . <br /> -1- <br />