Attachment_No__1a_O_M_Plan_0001.pdf

This document is a site plan and technical specification sheet for a road construction project in a mountainous terrain, likely prepared for a federal infrastructure contract. The plan includes aerial/satellite imagery showing the road site location with annotations for natural surface, roadway, and slope details. The document presents multiple elevation profiles, perspective views, and plan views that illustrate the proposed road design with specific engineering parameters.

Key technical specifications include rolling dip design with crest and bottom elevation details, downgrade slopes ranging from 3% to 6%, and maximum elevation drops of 0.5 feet (1.0 feet maximum) across rolling dips. The plan specifies angled outlets 0 to 25 degrees from perpendicular to the road with daylight incineration where possible. Design parameters address location of rolling dips and spacing determinations to be finalized in the field and adjusted as necessary. The recommended maximum distances between rolling dips vary by downgrade percentage: 0-3% downgrade allows 395 feet for low to non-erosive soils and 240 feet for erosive soils; 3-6% allows 295 feet and 165 feet respectively; 6-9% allows 245 feet and 140 feet respectively; 9-10% allows 210 feet and 125 feet respectively; 10-12% allows 195 feet and 115 feet respectively; and 12%+ allows 165 feet and 100 feet respectively. The specifications differentiate between low erosion soils (coarse rocky soils, gravel, and same clay loam) and high erosion soils (fine, friable soils, silt, and fine sands).