The MWH, now part of Stantec, team was selected from a shortlisted group to design and provide support services for the North Valley Regional Recycled Water Program (NVRRWP), intended to convey highly-treated wastewater from the City of Modesto’s tertiary treatment plant to the Delta Mendota Canal (DMC). MWH is teamed with contractor Myers-Rados Joint Venture for this important regional solution to address water supply shortages faced by agricultural customers in California’s Central Valley and also deliver water to refuges in the area. An estimated 35,000 acre-feet per year of water will be delivered by the conveyance facilities being designed by MWH. The project includes approximately 7 miles of 42-inch diameter pipeline, 32 MGD pump station, a horizontally directionally drilled (HDD) crossing of the San Joaquin River, and an outfall at the DMC.
Challenges to be faced by the team include conducting computational fluid dynamic (CFD) modeling and physical test model for the existing pump wet well in order to meet Hydraulic Institute performance criteria, performing geotechnical analysis and recommendations to accommodate liquefiable soil conditions, and meeting permitting constraints and delivering the work to meet aggressive schedule requirements. Construction is planned to be substantially complete in October 2017, 2 months ahead of schedule.