Living and working on a Florida barrier island has its advantages, unless you are the Public Works Director. Treasure Island was born in 1951. This 5.3 square mile, mostly man-made island was created by dredging the Boca Ciega Bay—no clays, no loamy soils—just granular sands and residual from aquatic ecosystem. What does this mean for 17 miles of mainline sewers and laterals serving 6,800 residents and 15,000 seasonal residents? A challenge, but Michael Helfrich (Public Works Director) and Joyce T. Velitschkowski (President of J.T.V., Inc.) gained insight on this project that can be applied anywhere for anyone responsible for trenchless solutions: 1. CIPP Lining and Injection Grouting are not only complementary, but very necessary in this case. 2. Due to severe infiltration, Grout First makes CIPP mainline possible. 3. Grouting joints and lateral connections are most cost-effective. 4. Together, Grouting and Lining provide a more durable, longer-lasting solution. Small communities with limited budgets have to prioritize problems and choose remedies wisely. Treasure Island is a wholesale customer of a large, neighboring municipality and experiences an extremely high surcharge for excessive chlorides. To Helfrich, this could only mean high infiltration of saltwater, and through monitoring pump station data, discovered a gaping hole in a mainline located between a building structure and seawall. Trenchless was the only answer. Injection grouting stopped the active leaks, followed by CIPP Lining and grouting lateral connections. Result? 30% reduction in infiltration and with benefits compounded daily - this was the single best rehab investment Treasure Island could make.
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