As the Ocotillo Pipelines and Lift Station Construction Manager At Risk Projects come to a close, we highlight their significance and celebrate their success.
The City of Chandler continues to be a center for growth and vitality in the Valley of the Sun. Intel’s recent $5 billion investment in the construction of its new state-of-the-art semiconductor manufacturing Fab 42 facility on its Chandler Ocotillo campus has required the City to expand its water and sanitary sewer infrastructure in support of one of the world’s largest construction projects. In order to expedite design and construction of critical water and sanitary sewer system capacity upgrades, the City chose the Construction Manager at Risk (CMAR) project delivery method. This method allowed Chandler to efficiently manage multiple designers, multiple funding sources, and critical mandatory interim milestone completion dates while ensuring project quality and value expectations were met. The City chose Achen-Gardner Construction, LLC through separate qualifications based selection processes, to provide CMAR and general contracting services for two of these projects.
Ocotillo Water Reclamation Facility (OWRF) and Sewer Line Construction Project
The first of these CMAR projects included the construction of a new 20 MGD wastewater lift station to manage the additional regional flows. Located adjacent to the City’s existing Ocotillo Water Reclamation Facility (OWRF) (southwest of Queen Creek and Price Roads), the new lift station provides the infrastructure necessary to regulate flows between the OWRF and the Airport Water Reclamation Facility (AWRF) approximately 6 miles to the east. Capacity and system upgrades include carbon source equipment, electrical building, standby emergency generator, odor control equipment, more than 2,400 LF of 42-inch diameter gravity sewer piping, and various flow diversion and junction structures. These new features increase the city’s operational flexibility by allowing the diversion of wastewater flow to multiple plants as needed. Wilson Engineers is the designer of this project which is scheduled for completion in June 2013.
South Chandler Wastewater Force Main (OWRF to AWRF) and Water Transmission Main Project
The second CMAR infrastructure project required the construction of more than 6 miles of new 42-inch diameter high-density polyethylene (HDPE) sewer force main and 5 miles of 24-inch diameter ductile iron pipe (DIP) water transmission main. The principal alignment for each of these pipelines was within the Ocotillo Road right-of-way (McQueen Road to Dobson Road). This project provides a new sanitary sewer force main (FM) linking Chandler’s OWRF and AWRF and provides the water transmission main (TM) capacity upgrades to support Intel’s expansion. Seven large diameter jack and bore crossings were also part of the scope, including crossings of the Union Pacific Railroad, SRP’s Consolidated Canal, and three major intersections. The CMAR framework allowed for the early procurement of long lead materials, critical community outreach, and development of a plan that ensured that critical pedestrian, traffic, residential, and business access was maintained during construction. The project design engineer was Black & Veatch Corporation. Final construction and testing of the pipelines was completed in May 2013.
The new HDPE sewer force main is an especially important upgrade according to John Pinkston, City of Chandler Wastewater Facilities Superintendent. “The flexibility, added capacity, and expected reliability of the new HDPE force main make it able to handle current and future wastewater flows from Intel and other sources,” John said.
Teamwork and Project Success
The newly constructed lift station and pipelines are to be fully functional in July 2013. The use of CMAR and the collaborative design and construction efforts of the City of Chandler, Intel, Achen-Gardner, and numerous local engineering and construction firms has resulted in new and critically needed infrastructure for the City of Chandler. Most of these improvements are located just a few feet underground and are unknown to most that pass over or nearby. But to those who have partnered in this very successful project, that few feet will never obstruct the view of this memorable accomplishment.
As stated by John Knudson, City of Chandler Utilities Engineering Manager, “The CMAR delivery method, when executed correctly by committed participants using carefully administered project contingencies, results in a positive outcome both operationally and financially. On this project, the consultants and contractors have shown commitment to the City of Chandler deeper than can be measured in dollars or days.”
Project Owner: City of Chandler
CMAR/General Contractor: Achen-Gardner Construction, LLC
Designers: Wilson Engineers, Black & Veatch Corporation
Major Subconsultants/Subcontractors: MGC Contractors, Inc., Ludvik Electric, Pipe Jacking Unlimited, ATC Associates, MakPro Services, Joseph Painting Company, Inc., R T Underground, Survey Innovation Group, Trafficade