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Section 7 - 77 + 00 <br /> 1 ,500 foot segment from RO-3 discharge to Culvert C-5 outfall . Gullying <br /> 4-6 feet deep extends for several hundred yards below C-5 outfall . <br /> Culvert C-5 has rusted out and can no longer function properly. Replace <br /> culvert or remove and construct rolling dip. Install series of water <br /> bars through segment and install series of check dams to stabilize gully <br /> and slow velocities below C-5 outfall . Road width averages 30-35 feet. <br /> Reduce with combination inside ditch excavation and fill slope reduction. <br /> Gully on cutslope at approximately 82 + 00. Source of gully is drainage <br /> from old exploration road mentioned previously. Slough in fill at <br /> 83 + 50. Slough is 100 feet x 30 feet with a 3 foot scarp. Grade to <br /> eliminate scarp and seed. Install water bars above and below slough. <br /> Fill slopes generally well vegetated through this segment. Cut slopes <br /> poor veg but cuts mostly in shale outcrop. <br /> Section 8 - 62 + 50 <br /> 1 ,450 foot segment from Culvert C-5 to Culvert C-4. Minor slide zone in <br /> natural slope slope below fill approximately 76 + 00 - 74 + 00 <br /> designated "slump spring" on ATT.2, Plate 3. Significant fill erosion in <br /> slump zone. Water bars with riprap or other outlet protection through <br /> here. Filter fence along base of steep slope to trap sediment. Width <br /> reduction through combination cut/fill excavation as described <br /> previously. Culvert C-IN shown at sta. 72 + 00 on plate 3 has not been <br /> installed. Additional fill erosion at 72 + 50. <br /> Culvert C-4 rusted out and leaking; will need to be replaced with new <br /> culvert or rolling dip . Culvert outfall is protected with large rock and <br /> erosion is not severe although significant sediment accumulation in <br /> ephemeral channel below culvert outfall . A series of check dam <br /> structures are suggested for the relatively gentle channel below the C-4 <br /> outlet. <br /> Deep gully in cut slope and natural slope above road at 63 + 50. Portion <br /> of drainage originates from RO-4 discharge mentioned previously. Some <br /> segments of this gully will require check dam structures although the <br /> 100 foot segment on steep slope immediately above Road C is being <br /> stabilized by fallen timber and collected debris . <br /> Section 9 - 55 + 00 <br /> 750 foot segment from Culvert C-4 to unnumbered 24" culvert. Road <br /> segment is primarily cut into steep , unweathered shale outcrop. No road <br /> fill to speak of. Steep slope below road is mantled by weathered shale <br /> debris from road construction. Silt fencing would be appropriate along <br /> the base of the slope adjacent to the ephemeral channel . Crest of <br /> downslope should be rounded for stabilization/reclamation. Culvert and <br /> outfall at 55 + 00 is in good condition . The abandoned exploration road <br /> runs along the crest of the road cut through this segment, and should be <br /> ripped and revegetated . <br /> -6- <br />