Project Engineering Consultants (PEC) provided planning, design, and construction management for the primary outfall of the Bagley Industrial Park located within West Jordan, Utah. Within this rapidly expanding city, there are several industrial parks, including the Bagley Industrial Park, which boasts tenants such as Dannon Yogurt, Interstate Brick, and Kraftmade with new industrial tenants arriving every year. These growth conditions along with dated infrastructure have required recent upgrades to accommodate the needs of current and future users.
The initial concept for this project was to commence with conventional cut-and-cover methods. At initiation of the project, PEC collected video logs of the system, compiled flow data, evaluated the main sewer lines servicing the industrial park, and revised the City’s sewer master plan. The existing outfall for the industrial park consisted of 4,000 LF of 10-inch I.D. concrete pipe in the Old Bingham Highway. Preliminary engineering analysis demonstrated that this outfall was undersized, approaching capacity during peak flows, and would require upsizing to 18 inches O.D. in order to accommodate recent growth and future demands. Upon additional investigation it was also discovered that the project corridor was extremely constrained by existing travel lanes and access to the industrial park, right-of-way, landscaping including walkways, decorative concrete, stone/concrete fencing, as well as an overabundance of underground and overhead utilities including communication lines, fiber optics, high voltage power, intermediate and high pressure gas lines.
Pipe bursting was selected as the preferred construction alternative. The pipe burst consisted of a triple upsize from an existing 10 inch (ID) concrete pipe to 18 Inch HDPE (OD). The necessity for a 22 inch bursting head constituted a 120% increase in size and placed this project within experimental ranges. The construction costs for the pipe bursting proved to be 24% less per linear foot than average open-cut costs. Additionally, the anticipated construction duration was also reduced by an excess of 30% due to elimination of complications with backfill moisture content, bracing of existing utilities, and paving restrictions generated by winter weather conditions. In summary pipe bursting allowed the contractor to avoid lane closures, right-of-way constraints, and impacts to communication lines as well as intermediate and high pressure gas lines.