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Rehabilitation of a Severely Deteriorated 66” RPC Using Innovative Spiral-Wound Renewal Technologies

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In the process of completing a sewer system master plan and condition assessment of the major sewer trunk line systems that connect to a 50 MGD wastewater treatment plant, it was discovered that a 50-year old 66-inch concrete trunk line was severely deteriorated from hydrogen sulfide corrosion (H2S). The condition assessment inspection included CCTV, Sonar and laser technologies. This 66-inch trunk line crosses a major Union Pacific railroad line, commuter rail tracks and an interstate freeway. Repair of this line was also complicated by the fact that this area has numerous warm water artesian springs that are collected in the granular pipe zone and trench backfill material. The resulting hydrostatic pressure and inflow into the 66-inch sewer was evident in the video of the line. Various trenchless repair methods were evaluated and a project was bid allowing the contractors to consider several alternative trenchless methods. Selection was based on lowest responsible bid. The rehabilitation method chosen was SPR-PE. This paper discusses the bidding and construction of this project including the construction issues and resolution of those issues.
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Document Type: Research Article

Publication date: 2012-01-01

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