THE OPPORTUNITY

New Jersey American Water (NJAW) owns, operates, and maintains a 980 milliongallon Glendola reservoir. Raw water is supplied to the reservoir from: Manasquan River, Shark River and NJAW Well No. 7. Raw water from Manasquan River is pumped from the NJWSA Hospital Road Facility via 21,000-ft 36-inch main. Raw water from Shark River is supplied by Shark River Intake Facility via 6,800-foot 36-inch main. The two 36-inch mains tee together into a single 30-inch main. After the tie-in, the single 30-inch main then runs ~2,200 linear feet before discharging into the Glendola Reservoir via outlet pipe. The pumping capacities of the two pump stations are hindered by the bottleneck created by the two 36-inch mains connecting into a single 30-inch main

THE CHALLENGE

The main challenges of this project were to find design solutions that minimize disruption to the existing NJAW facilities and allow maintaining service to the existing 30” raw water main to maintain a required minimum water level in the reservoir during construction, as well as to minimize road closures. Additionally, the project was subject to the NJDEP - Flood Hazard Area Permit conditions that imposed limits on when the construction can take place in and around the reservoir.

THE PS&S SOLUTION

PS&S worked in close collaboration with NJAW engineering and operations departments to engineer a solution and to dissect the project into phases. The solution took into consideration seasonal water demands and permitting limitations, while minimizing the number of times the contractor had to mobilize, thus reducing the cost of construction.

During the design, a bathymetric survey of the reservoir was performed. Engineering services during construction included full time inspection services as well as underwater structural inspection of the new and existing outfall pipes.