Wastewater Collection System Rehabilitation Techniques for Army Installation

Aging sewer systems can cause serious and expensive problems on Army installations, such as greater infiltration/inflow (I/I). I/I raises the total volume of water, which makes treatment more difficult and costly, may result in fines for exceeding prescribed flow rates, and may cause sewers to overflow. This report is intended for Facilities Engineers faced with sewer rehabilitation issues. It describes conditions which promote I/I, summarizes several methods for rehabilitating and resealing sewers, reports preliminary test results for a method never before used for sewer rehabilitation in the United States, and discusses the applicability of each method under certain sewer system conditions. Appendices provide information on current Army sewer systems, on writing specifications for inspection and rehabilitation contracts (a standard, comprehensive Statement of Work which can be tailored as needed), and on inspecting rehabilitation work. Keywords: Waste water; Sewers deterioration.