Retaining wall construction covers MSE walls, CIP walls, and soldier pile/lagging walls. MSE wall inspection: select backfill gradation, compaction ≥95% T-99, reinforcement length and spacing per design. Wall face alignment tolerance: ±3/4 inch in 10 ft. CIP walls: formwork, reinforcement, concrete placement per structural concrete requirements. Backfill placement in maximum 8-inch lifts with compaction testing.
References: AASHTO current edition, CA Standard Specifications, FHWA Technical Advisories, and applicable federal regulations (23 CFR). Contractors shall maintain current copies of all referenced standards on the project site.
Source: Caltrans Construction Manual, 2024 Edition. Pages 19–20 of 29.