An exploded axonometric view details a 2-foot by 2-foot precast concrete catch basin with an adjustable riser section, metal frame, and grate. The base catch basin measures 2 feet 8 inches by 2 feet with an interior clear opening of 2 feet by 2 feet, and features embedded threaded inserts on the exterior walls. A riser section sits atop the catch basin with variable height, while a metal frame and matching grate cap the entire assembly. General notes specify that vaults are designed to meet ASTM C858 with AASHTO HS-20 loading, and require eight inches of minimum compacted type G material below the catch basin.
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