Hennepin County

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PROJECT QUESTION: I understand from the special provisions, that the PVC sanitary sewer pipe within the Vapor Mitigation Areas requires special polywrap and tape, while the HDPE storm sewer requires special gaskets. I am wondering if the PVC storm sewer in these areas requires anything special?

Q: I understand from the special provisions, that the PVC sanitary sewer pipe within the Vapor Mitigation Areas requires special polywrap and tape, while the HDPE storm sewer requires special gaskets. I am wondering if the PVC storm sewer in these areas requires anything special?

A: The PVC storm sewer pipe within the vapor mitigation areas is actually pressure-rated for water use due to close proximity to water supply piping. As such, it is not subject to the special polywrap and tape requirements (all such systems, including the water main, are not susceptible to vapor intrusion).