CEI has done extensive sewer design, rehabilitation and infiltration / inflow assessment over the last 15 years. One recent project was for the Town of Peterborough, New Hampshire. This project involved a septic system evaluation, sewer prioritization and a conceptual sewer design for Source Water Protection in the town of Peterborough. The two biggest drinking water supply wells for the town are located in close proximity to a densely populated residential development which was established in the early 70s. Most of the development was unsewered and contained septic systems of varying ages and types. The septic system evaluation and sewer prioritization involved ranking unsewered areas throughout the development based on different parameters affecting the potential migration of pollutants from the systems into the groundwater supply. The conceptual sewer design involved an existing system analysis for impacts from additional homes, a conceptual layout including pipe lengths, pipes sizes and number of manhole structures and conveyance method considerations like gravity fed or pumping requirements. Three of the highest priority areas were recommended for sewering with a connection to an existing gravity line. In another area, CEI recommended using a low pressure system consisting of grinder pumps located at each home tied to 2 foot and 3 foot force mains that follow the existing road topography.
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