West Yost provided construction management services for this project which featured construction of two separate wastewater pump stations as part of the $600 million Lower Northwest Interceptor program. The pump stations included dual wet and dry well pump stations, CMU Switchgear Buildings, CMU Emergency Standby Power Buildings, buried Junction Structures, Odor Control Facilities, and Chemical Feed Systems.
Other features included:
- Pump stations were over 60-feet deep with cast-in-place concrete structures that included dual train wet wells and dry wells constructed for an ultimate capacity of 220 mgd. Construction required a deep excavation with high groundwater. Base slab was 13-feet thick and the walls between 5- and 8-feet thick.
- Large diameter RCP and C-200 pipelines from 60- to 120-inch that include pig launching stations and flushing water systems supplied from water provided by RD-1000.
- Odor control systems that included liquid calcium nitrate systems and air scrubbers using bio-filtration.
- Water supply system that included a deep groundwater well, hydropneumatic tank, disinfection, and a 300,000 gallon welded steel water storage tank.
- Pumps which included 1750-hp, VFD non-clog centrifugal pumps, and two (2) 2000-kW diesel fueled backup power generators.
- Switchgear buildings that housed dual fed 4160V switchgear with 4160V VFDs for the large pumps (> 1500-hp) and 480V VFDs for the 300-hp pumps.
- The New Natomas Pump Station included demolition of portions of the existing pump station and interconnection of the existing pump station with the new pump station.
The project won the CMAA 2008 National Project of the Year award for an infrastructure project greater than $100 million.
Team Spotlight
J.P. Davis, PE, CCM, QSP
Construction Management Business Sector Leader
J.P. Davis, PE, CCM, QSP
Construction Management Business Sector Leader
“I am passionate about my job! I see my clients and the contractor on a day-to-day basis, face-to-face. I enjoy getting to know them and their work styles. My goal is to meet their needs so that the whole team can have a successful project. Start-up is one of my favorite phases because using my experiences from prior projects, I can head off challenges before they impact the project cost and schedule. It is rewarding to start from nothing, coordinate a large team, pull in large equipment, and bring a system to life!
I am proud of the successful completion of the City of Modesto Headworks, Dryden Box, Influent Flume Improvements Project this year. Working together with the City and Contractor to continue the Headworks project safely and effectively amidst the pandemic, which was quite a feat considering nobody on the project contracted the virus. I created a collaborative team and was able to show value to the City, which led to winning the River Trunk Realignment Project, so we can continue support to the City for the coming year.”
Eric Harman, PE
Construction Manager IV
Eric Harman, PE
Construction Manager IV
“The value I provide is helping organize contractors to bring an idea on paper to a successful project that meets the owner’s intent with minimal impacts or headaches. We are prepared for everything, including the unknown, to stay on the critical path to on time completion.
The North Valley Regional Recycled Water Program project for the City of Turlock was a rewarding for all of the solutions we were able to provide to the City. We faced challenges including several environmental restrictions involving buffer zones for threatened raptor nests; impacts to riparian habitats and other special status species along the pipeline alignment. In addition, significant groundwater was encountered during excavations that had to be properly controlled and disposed of. Finally, an unusually wet winter season significantly delayed the work. The fact that we were able to complete the project while keeping change orders under 3% was a great team accomplishment. I’m very proud to have led the project team to overcome all of the challenges and deliver the water to the ultimate end-users, central valley farmers, in a timely manner.”