Earthwork inspection covers clearing/grubbing, excavation, embankment construction, and subgrade preparation. Compaction requirements: 95% standard Proctor density for embankment fill (AASHTO T 99), 100% for subgrade under pavement. Maximum lift thickness: 8 inches loose for standard fill, 6 inches for select material. Moisture content within ±2% of optimum. Nuclear density testing per AASHTO T 310 at frequency of one test per 2,000 square yards per lift.
References: AASHTO current edition, AZ 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: ADOT Construction Manual, 2024 Edition. Pages 5–6 of 29.