Overpeck Valley Parallel Relief Sewer
The Overpeck Valley Parallel Relief Sewer Project of Bergen County Utilities Authority (BCUA), N.J., is a $65 million CSO improvement program to meet a state consent order by 2010. One major program component includes a total of 6,000 ft long, 72-in. diameter reinforced concrete pipe (RCP). The alignment includes drives through 2,788 ft of extremely soft glaciolacustrine varved clay, 3,214 ft of loose to medium dense mixed soils containing silty sands, gravels and boulders and crosses under the New Jersey Turnpike, US Highway Route 46, a CSX Railroad Intermodal Yard and a branch mainline.
This project is the longest and largest microtunnel project in the state of New Jersey in recent years, with under-crossings of highways and railroads built on extremely weak soils with Weight of Rod SPT values, as well as fills containing saturated silty sands, gravels and boulders. The entire microtunnel project was completely within schedule, under budget and with zero claims.
Project Owner: Bergen County Utilities Authority
Engineer: Hatch Mott MacDonald
Contractor: Northeast Remsco Construction
Estrella to Stockham, Ariz., Auger Boring Project
The Estrella to Stockham, Ariz., auger boring project involved the installation of more than 500 bores along a stretch of the Sunset Route of the Union Pacific Railroad (UPRR). The railroad is in the process of double-tracking a majority of the Sunset Route to increase efficiency of its freight traffic. The auger boring work is located along a 103-mile section of the Route in Arizona between Estrella and Tucson.
The 500-plus bores ranged from 36, 48, 60, 72 and 84 in. Eight boring machines were mobilized. What made the project unique is the partnership of the three contractors — a first for all three involved and unusual for such a project. Cooperation and communication between all three was critical to making this work. There was also extensive pre-planning.
Project Owner: Union Pacific Railroad
Engineer: HDR Engineering Inc.
Contractors: Midwest Mole Inc., Iowa Trenchless and Pacific Boring
Manufacturers: American Augers and Barbco Inc.