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As part of their mandate to protect the nation’s ground water, the EPA administers the National Pollutant Discharge Elimination System (NPDES). This is a good reference for any community that maintains both sanitary and storm sewers. Here are a couple of good documents I discovered:Sewer Cleaning and Inspection fact sheet. This document describes the various methods for cleaning and inspection of muni sewer pipes, as well as the pros and cons of each.
http://www.epa.gov/npdes/pubs/sewcl.pdfCombined Sewer overflow operations and maintenance fact sheet. Interesting to read that it costs on average $1,700 per mile to clean a muni sewer pipe, and that is in 1998 dollars!
http://www.epa.gov/npdes/pubs/o&m.pdf