into protection areas back to skid trails approved by the Forest Officer. Where 

 feasible fell material in a manner such that remaining tops and sub 

 merchantable material are aligned predominately perpendicular to the slope. 



Skidding Limitations 



• Limit ground-based logging systems (tractor, skidders, and mechanical 

 harvesters) to slopes less than 40% on ridges, convex slopes, and concave 

 slopes when winter conditions exist and less than 35% on concave slopes 

 without winter conditions. 



General Road Design Mitigations 



• Install and maintain adequate road drainage to control erosion and comply 

 with Best Management Practices (BMP's) and maintain concurrent with 

 hauling operations. To maintain drainage features and avoid rutting, limit the 

 season of road use to dry, frozen or adequately snow covered conditions. 



• If cutslope or fill slope slumps occur on existing roads, stabilize within the 

 course of the harvest project to control erosion. 



• Monitor road drainage conditions as part of project operations and make 

 repairs as needed, including culvert cleaning and revegetation. 



Site-Specific Design and Mitigations 

 Skid Trail Planning 



• Have the logger and Forest Officer agree to a skidding plan prior to equipment 

 operations. Identify which main trails to use and what additional trails or 

 mitigation may be needed. Do not use trails that do not comply with BMP's 

 (i.e. draw bottom trails). Close trails with additional drainage installed where 

 needed or grass seeded to stabilize the site and control erosion. 



• Locate skid trails at least 75 feet apart unless on snow. 

 Use skidders with 75 feet of winchline for skidding of selected sites. 



• 



• Install erosion control in skid trails on disturbed sites where needed as 

 directed by the Forest Officer. 



• Use designated draw crossings only under dry or frozen conditions as 

 approved and directed by Forest Officer. 



Down Woody Material 



• Retain five to ten tons per acre of woody material larger than 3 inches 

 diameter left scattered throughout the harvest units. Leave the majority of 

 slash within the harvest units or return skid as required by the Forest Officer 

 to insure slash and woody debris is well distributed for erosion control and 

 nutrient cycling. Fell or align material predominantly perpendicular to the 



Dirty Dee Salvage Environmental Assessment 2-4 



