Division 800 — Section 802
800-5 Section 802 — Pipe Underdrains
802.1 Description 1 Construct underdrains using pipe and granular filter material , and construct underdrain pipe outlets. 802.2 Materials 802.2.1 Pipe Underdrain 802.2.1.1 Corrugated Polyethylene Pipe Underdrain 1 Provide pipe that meets AASHTO M 252 for corrugated polyethylene pipe. 802.2.1.2 Polyvinyl Chloride (PVC) Pipe Underdrain 1 Provide PVC pipe that meets AASHTO M 278 , Class PS 46, cell classification 12454- B as defined in ASTM D1734 , or pipe that meets ASTM D3034 , SDR 35. 802.2.1.3 Polyethylene (PE) Pipe Underdrain 1 In all underdrain applications under this Section , polyethylene pipe may be substituted where PVC PS 46 pipe is specified. Ensure that the polyethylene pipe meets AASHTO M 252 and Qualified Product s List 30, with the following exceptions:
A.Corrugated polyethylene pipe underdrain, in nominal sizes of 4 in. through 10 in. , having a full circular cross -section with an outer corrugated pipe wall and smooth inner liner as specified in AASHTO M 294, Section 4.1.2 – Type S for non- perforated or Section 4.1.4 – Type SP for perforated pipe as specified in the Plans.
B.Polyethylene pipe underdrain that meet s the minimum pipe stiffness (PS) of AASHTO M 278 at 5 % deflection when tested according to ASTM D2412 .
C.Acceptance of polyethylene pipe underdrain is based on conformance with the above specifications. 802.2.2 Aggregate Fill 1 Use coarse aggregate No. 57 consisting of crushed stone, crushed slag, or gravel conforming to Subsection 801.2.1.
Source: South Carolina Standard Specifications for Highway Construction, 2025 Edition. Pages 836–835 of 908.