The above map depicts several of the locations where the City’s sewer systems were found deficient
for which EA developed contract documents for the repair and rehabilitation.
EA designed the rehabilitation and replacement of sewer lines in 18 areas within the Lincoln wastewater system, which were deficient due to age of facilities and change in standards. EA collected preliminary data including the City’s proposed sewer alignments and TV inspections. A topographic survey was conducted that provided a detailed map of all properties, trees, driveways, fences, and existing utilities. The invert elevation of all existing manholes was surveyed to be used for mapping the existing storm, electrical, and sanitary sewers. At many sites, vacuum excavations were conducted to determine the exact elevation of utilities that crossed near the proposed sanitary sewers. Due to the age of facilities and change in standards, the project involved solving many different deficiencies at each site. Many lines required an increase in pipe size based on current best practices for minimum diameter and increased usage, and some lines needed to be abandoned and replaced due to low spots and inadequate flow characteristics such as inadequate slope and velocity. With stakeholders, EA determined the best possible route and most cost-effective solution for each proposed sanitary sewer that included creative construction techniques such as boring and jacking, and pipe bursting.
