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Stormwater Comments # 2_5.14.14.pdf · · · · · · · · Metal: ACSP – Aluminized Corrugated Steel Pipe (Type 2 meets AASTO designations M274 and M36) ASRP - Aluminum Spiral Ribbed Pipe (16 gauge or better) CAP –Corrugated Aluminum Pipe (16 gauge or better) DIP – Ductile Iron Pipe (Class 50 or better) Concrete: PCP – Plain Concrete pipe RCP – Reinforced Concrete Pipe Plastic: PVCP – Polyvinyl Chloride Pipe (SDR 35 or better) CPEP – Corrugated Polyethylene Pipe (smooth interior wall, or N-12pipe) ® RPP- Ribbed Polyvinylchloride Pipe ·