He pointed to the reinforced concrete apron. "If we let them shim it, that grate pops loose the first time a snowplow hits it in January. Then we’re back here in the dark, replacing a tire for a grandmother who didn't see the hole. We follow the detail. Reset the casting. No shortcuts."
Contractors often confuse "Class B" bedding with "Class C." Best practice: For any pipe larger than 48 inches under a roadway, default to the higher standard. Ensure the granular material meets the exact gradation specified in the detail—not just "any gravel." Photographic evidence of the bedding angle (measured from the springline) is now required for acceptance. njdot standard construction details best