Attachment 6 - Standards and Specs Supplemental.pdf

This document is a U.S. Department of Agriculture Forest Service Standard Trail Plan specification that provides detailed technical guidance for trail construction and restoration work, along with material requirements for roadside improvement projects.

The trail construction specifications cover four primary sections: existing trail restoration (broken down, trenched, sloughed, and washed sections), typical surfacing sections (outsloped, excavated, and raised profiles), riprap surfacing, standard culverts, typical ditch sections, and drain dips. The document includes detailed cross-sectional drawings showing shoulder widths, tread widths, backfill materials, and geotextile placement requirements. Material specifications address multiple surface course types (pitrun, aggregate, clay, woodchips), base course materials, leveling courses using pitrun or aggregate, and bedding materials. Culvert specifications require compacted backfill in 6-inch lifts, specific bedding dimensions, and retainer type options. Ditch sections cover dimensions, lining materials, check dam configurations, and lead-off ditch spacing based on drainage grades. Drain dips specify construction dimensions, geotextile types, and rock spillway requirements. Seeding, fertilizing, and mulching applications require specific seed types, fertilizer formulations, and mulch materials including straw, wood fiber, and cellulose fiber options.

Section 713 provides comprehensive material specifications for roadside improvements including topsoil (3.0-10.0% organic matter, pH 6.0-8.0), agricultural limestone (75% minimum purity), commercial fertilizers, certified weed-free seed, and multiple mulch types (straw, wood fiber, grass straw cellulose fiber, peat moss, and mature compost). Additional specifications cover plant materials conforming to American Standard for Nursery Stock, cellular confinement systems with minimum 120-month functional longevity, miscellaneous planting materials (stakes, hose, wire, wrapping materials, twine), sod requirements, soil pegs, tackifiers, fiber rolls (excelsior, straw, coir, and compost), gravel and sand bags, temporary culvert pipe, silt fencing with specific post and reinforcement requirements, rolled erosion control products with detailed performance specifications across multiple types (1.A through 4.B), turf reinforcement mats, sediment filter bags, prefabricated filter inserts, floating turbidity curtains, and plastic lining. Section 850 addresses rock lining requirements specifying acceptable rock quality, gradations across six classes (R-8 through R-3), geotextile placement under rock, and construction procedures for even distribution without segregation or geotextile damage.