This document highlights the elemental differences between 2 approaches to collection system and WWTP improvement. The new approach is called the “Migration Approach” while the old USEPA approach is called the “Defect Approach.” The differences stem from 30 years
of observations about what went right and what went wrong in sewer system rehabilitation. In essence, the Migration Approach, is a combination of three things: Incisive engineering A new type of
cost analysis and Comprehensive rehabilitation
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