NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

DIPRA and ANSI/AWWA C105/A21.5 recommend protecting ductile-iron pipe in corrosive soil primarily by:

Relying on select sand bedding alone for the life of the line Leaving the pipe bare so the 1-mil asphaltic coating can act as a waterproof tank Loose polyethylene encasement installed at the trench in accordance with C105 Filling the trench with cinders and ashes for drainage

Correct Answer:

Loose polyethylene encasement installed at the trench in accordance with C105

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