Swan Creek Trunk Sewer Phase 2

Following the success of the Swan Creek Trunk Sewer Improvements – Phase 1 project, the City of Athens engaged Krebs to design the Phase 2 portion of the gravity sewer improvements. As part of the design, Krebs performed a capacity analysis on the Swan Creek Basin and recommended the new trunk sewer be sized as a 36-inch diameter to accommodate current and future flows. As the industry was experiencing a resin shortage, the lead time and costs of PVC pipe were significantly impacted. Krebs recommended bidding PVC pipe as the base bid with fiberglass reinforced polymer mortar pipe (FRP) and triple wall polypropylene pipe (PP) as two alternate bid items. The FRP pipe was selected, saving approximately $200,000 and months of pipe material delivery time for the City of Athens.

The project included approximately 3,000 linear feet of 36-inch diameter FRP gravity sewer, including five connections to the existing gravity sewer. In addition, one 18-inch gravity sewer point repair, one 15-inch gravity sewer point repair, one 12-inch gravity sewer point repair, and two 48-inch diameter manhole replacements were included in the project. Since the project’s completion, flow monitoring data has indicated infiltration and inflow have been considerably reduced in this basin.