Gwinnett County Find-and-Fix

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When Gwinnett County opted to use a find-and-fix approach to repairing inflow and infiltration entering its collection system, the Inliner Technologies team set out to investigate and rehabilitate the sewer system in predetermined basins. To obtain immediate results the team used existing data, including GIS, previously collected data, and information from discussions with Gwinnett County field staff. The data enabled the project team to show an almost immediate reduction in I/I.

The rehab area was defined as sewers and manholes within the 100-year floodplain in four basins. GIS was used to identify parts of the system that met these criteria and ultimately to compile maps containing nearly 700 map tiles per set for field crews doing manhole and TV line inspections. The field maps contained all of the facility IDs for the entire system, which are referenced in the field inspections.

As the data was collected, it was input into GBA Master Series, a facilities management application. A defect prioritization matrix was concurrently created to organize the defects and ensure the largest and most severe defects were targeted first and to allow for tracking of defects with lesser severity. The County was interested in identifying defects and observing flow produced by these defects so that I/I could be identified and tracked as the system was renewed. As the data was populated, GBA is used to generate work orders and track progress of the inspections. The work order repairs included manhole rehabilitation, inserts, and resets, as well as sewer segment lining, joint repairs, and point repairs through excavation. In addition, manholes were located using survey-grade GPS to improve the accuracy of the County's sewer network.

Role / Responsibility

Layne Inliner, LLC (formally known as Reynolds Inliner, LLC) - Prime Contractor; CIPP and miscellaneous rehabilitative measures