VDOT request CIPP Corp. liners for use on I64 / HOV Lanes

CIPP Liner being prepared for Installation on I64 / HOV Lanes

While most residents in Hampton Roads slept Tri-State Utilities’ crews installed 70′ of 24″ diameter CIPP liner to prevent a structural failure of the storm drain system inside the restricted use HOV travel lanes. The one-night installation prevented what could have been a week long disruption to the HOV lanes if open cut replacement would have been used. Virginia Department of Transportation (VDOT) specifications, List 38, allow for the use of several pre-approved trenchless pipe repair technologies whereby existing culverts are repaired in place rather than “dig and replace.” CIPP Corp’s liner has four products on this approved list and is becoming a more popular stormwater culvert rehabilitation method. This trenchless rehabilitation technology includes saturating a flexible polyester liner with a Polyester or Vinylester based resin and curing the liner onsite with steam or hot water. VDOT has established stringent specifications for the use of styrene-based as well as non-VOC based CIPP liners to prevent water quality impacts from its installation or use.

As specified by VDOT, Tri-State Utilities pulls in a pre-liner into place. Additional felt was carefully placed to catch any of the uncured resin at each end of the liner.

A Pre-Liner is pulled into place prior to CIPP Installation

Water samples are taken after the 24″ CIPP installation and sent to a third party lab. The water is analyzed for the presence of styrene and the results came back “below quantitation levels.”

This test confirms what the CIPP industry has stated for years, that the styrene is captured in the resin and poses no environmental problem. Most CIPP environmental problems occur due to poor housekeeping by the installation crew or by discharge of superheated water into a small BMP or estuary. When large amounts of superheated water are discharged into small bodies of water the oxygen is removed which can cause fish or plant suffocation. Thus, the benefits of steam cure, which result in relatively no discharge water.

Environmental services laboratory tests for styrene

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