Laterals comprise up to 50% of a collection system and up to 80% of I/I derives from the private side. Defects can ultimately lead to sanitary sewer overflows (SSO’s) or combined sewer overflows (CSO’s). If there is a blockage in a lateral, it is a prudent safety practice to visually inspect the line before making any repair or rehabilitation decisions.
The most common method to investigate laterals is a visual inspection using a closed circuit television (CCTV) camera. Over the last decade, technological improvements to lateral mainline systems make them the preferred method of inspection. Not only are more laterals accessible with improved technology, but laterals can be located with GPS to update mapping and GIS records. HUSA conducts lateral inspections in accordance with NASSCO’s Lateral Assessment Certification Program (LACP). In certain conditions, pushrod CCTV cameras are the preferred inspection method and HUSA has significant experience with many different types and manufacturers of pushrod systems.
Much like traditional CCTV cameras, lateral cameras can also be used to identify sources of I/I, solids accumulation, root infiltration, pipe defects, and the overall structural condition of the laterals. Lateral systems are also the preferred inspection method to verify the absence of cross bores resulting from horizontal directional drilling (HDD) operations. HUSA also has experience with dye testing and rainfall simulation testing to identify laterals that are subject to infiltration.
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