WITHIN OUR MANY AGING SEWER COLLECTION SYSTEMS,manholes are a major point of entry for corrosive materials. As these structures begin to crack and corrode, they leak ground water, introducing soil, sediment, gravel and other abrasives into sewer systems, which can cause increased corrosion and erosion of concrete, steel and linings throughout the sewer system. Leaks and cracks in manholes should not be allowed to develop and grow, not only because they bleed contaminants into the sewer system, but also because they threaten the structural integrity of this essential feature of sewer treatment systems. While rebuilding or replacing a manhole is a large undertaking, repairs performed from inside the manhole, using a four-step trenchless process, are relatively efficient and cost-effective.
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