5-PaDot Section - 350.pdf

This document is a technical specification section (Section 350) detailing subbase construction requirements for a transportation infrastructure project. The section provides comprehensive guidelines for preparing, constructing, and maintaining a compacted aggregate subbase, specifying material types, equipment usage, mixing procedures, placement techniques, and quality control measures. Key technical requirements include using Type C or better aggregates (No. 2A and No. OGS), preparing and submitting a Subbase Delivery Plan, controlling subbase elevation and depth, and ensuring proper compaction and density.

The measurement and payment section outlines compensation methods based on area (square yard), volume (cubic yard), or mass (ton), with the department willing to pay up to 75% of the estimated subbase quantity until the base course or pavement is constructed. Specific compaction standards require achieving at least 100% of maximum dry-mass density, with provisions for testing, remediation, and potential material replacement if density or depth requirements are not met. The specification includes detailed requirements for material handling, stockpiling, moisture control, layer thickness, and restrictions on construction traffic to maintain subbase integrity.