SOW Attachment 4 - Construction Details.pdf

This document is a technical specification and design standard sheet for curb ramps, pavement sections, and accessibility features for pedestrian infrastructure, likely part of a federal construction or surface improvement project.

The specifications detail four primary curb ramp types (A, B, and C) with precise dimensional requirements for accessible pathways. All designs mandate a maximum 2% slope in all directions, 6-foot minimum width, and 5-inch minimum height curbs. Detectable warning surfaces must be cast-in-place, located 6 to 8 inches from the curb face, measuring 36 inches in the perpendicular direction and extending 3 feet along the ramp. The warning surfaces conform to SAE AMS-STD-595A yellow specifications with 0.2-inch tall domes spaced 2.35 inches on center. Curb ramp bottoms require maximum 5% slopes transitioning to PCC sidewalk sections. The document specifies concrete conformance requirements including #4 vertical rebar at 18-inch on-center spacing, #3 dowels at 24-inch spacing, and 12-inch minimum width full-depth AC sections where new concrete abuts existing asphalt. Vehicular asphalt pavement must include 4 inches of AC over 11 inches of Caltrans Class 2 aggregate base with 95% relative compaction to 12 inches minimum below finished grade elevation. Additional requirements address drainage inlet sediment barriers using burlap sacks or geotextile fabric, gutter slope restrictions for accessible path of travel not exceeding 5% longitudinal and 2% perpendicular slopes, and pavement conformance details showing new AC pavement grinding requirements of 0.15 inches minimum on existing surfaces. All specifications are marked "not to scale" with detailed Section A-A cross-references.