In 2015, The City of Medicine Hat Environmental Utilities Department (EU) identified approximately 2,400m of concrete sanitary main that had undergone rapid deterioration due to high H_2S levels caused by lengthy retention times. EU engaged ISL to complete a suitability assessment for cured in place pipe (CIPP) lining for 12 segments of sanitary main rehabilitation. Through a visual condition assessment using CCTV footage provided by the City and input from an industry representative, it was determined that the existing condition of the mains were ideal for CIPP lining. We then proceeded with design, tendering, and construction administration including manhole rehabilitation using Sprayroq, vault manhole replacement, sanitary main abandonment, and new sanitary main connections.During the initial site visit, it was identified that the work area is a major traffic corridor through the City so full road closure were not desirable. Through coordination with City representatives, a detailed traffic phasing schedule was created using partial road shut down combined with detour routes. In addition to a traffic schedule, a detailed bypass pumping plan was needed to divert upstream flows. The team analyzed flow monitoring data and recommended a staged bypass pumping schedule that followed the traffic phasing schedule to limit disruption to the surrounding work area. The project was completed in the summer of 2018 with temperatures reaching a high of 39 °C and overnight work mitigated impacts to local traffic
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