PennDOT – Publication 408, Section 601 (Pipe Culverts)
PennDOT – PTM 450 (Laser Profile spec)
PennDOT – RC 30 (installation specs)
PennDOT – Publication 408, Section 604 (Combination Storm Sewer and Underdrain [Perforated & Open Joint])
BD 636 – Reinforced Concrete Pipe Design Criteria