Boggs Mountain Demonstration State Forest Draft ... - Cal Fire

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Boggs Mountain Demonstration State Forest Draft Management Plan, June 2008 Figure 1. Table of Rolling Dip Dimensions Road grade (%) Upslope approach (distance from up-road start of rolling dip to trough)(ft) Reverse grade (distance from trough to crest)(ft) Depth below average road grade at discharge end of trough (ft) 12 100 20-25 1.3 0.1 Depth below average road grade at upslope end of trough (ft) 6. Outsloping (OS) This treatment calls for the removal of unstable or excess sidecast material from the outer edge of a road prism and replacing this spoil locally on the adjacent, remaining road bench, or at another stable storage site. In road upgrading, excavated material can be used to build up the roadbed and convert an insloped, ditched road to an outsloped road. Conditions that might limit road outsloping include: steep road grades, winter use of an unsurfaced road and upslope runoff or excessive spring-flow from the cutbank or roadbed. However, roads, which are outsloped for much of their length, can be insloped to deal with local conditions. Outsloping is most frequently performed using a combination of crawler tractors and excavating machinery. Roads crossing moderate or gentle terrain can be outsloped with tractors alone. On steeper sites or where there are numerous trees along the alignment, hydraulic excavators are often the best tools for performing the outsloping work. Figure 2. Outsloping "pitch" for roads up to 8% grade Road grade Outslope "pitch" for unsurfaced Outslope "pitch" for surfaced roads roads 8 1" per foot 11/4" per foot 7. Storage Areas and FillsiteTreatment (FS) In most cases, stable fillsites with adequate capacity are within a bulldozer’s push distance from a worksite. Rock pits, wide, stable sections of road, ridges and landings are typical locations where fill can be stored. All fillsites shall be thoroughly ripped prior to importing and placing spoil material. The fill shall be placed first along the inside area (against the cutbank) and then extended outward from the 60
Boggs Mountain Demonstration State Forest Draft Management Plan, June 2008 cutbank to approximately 8 feet from the outboard edge of the road or landing. Fill thickness should grade down to not more than 3 feet along the outboard edge of the road to minimize the potential for mass movement. The fill shall be shaped conformably into the existing cutbank, not to exceed the height of the cutbank. The steepness of any finished fillsite shall not exceed 50%. The finished surface shall not trap or pond surface water and must encourage surface flow in the same direction as adjacent lands. 8. Straw Mulching Straw from bales shall be spread evenly over a predesignated area at an application rate of 3000 to 6000 lbs./acre, as specified in the field. At these application rates, the ground surface will be visible in no more than 5% of the mulched area. Covered areas should be 3 to 4 inches deep. • Straw shall be spread evenly at the designated rate and within the designated bare and/or disturbed areas. • Bailing wire shall be removed from the site and disposed of properly. • Straw shall be as free as possible from exotic seeds. Hay shall not be used unless otherwise specified. • Mulching shall be the last task performed on the work area, following any heavy equipment operations, seeding and fertilizer application. Heavy Equipment 1. Bulldozers Bulldozers are best for moving large quantities of fill quickly, preliminary stream crossing excavations, rolling dips, recontouring rock pits and for final shaping of outsloped roads, landings and fillsites. 2. Excavators Excavators are best for lifting fill on steep slopes, final shaping of stream channel bottoms and working in tight locations, such as between trees. Excavators have a 360-degree swing, enabling them to put the fill directly behind them, where another piece of equipment can get to it. 3. Backhoes Backhoes are seldom used for excavating work, except for road maintenance activities such as replacing culverts. Their limited swing and reach, and low bucket capacity make them inefficient for large excavation sites. The major advantage of a backhoe is mobility and lowcost on small work sites. 4. Dump Trucks Dump trucks are a costly but essential method to move fill longer distances. If fill needs to be moved further than 800 feet, trucks are usually more cost-effective than bulldozers. The use of 10 cubic-yard trucks is very common. 61
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Boggs Mountain Demonstration State Forest Draft ... - Cal Fire

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