Gannett Fleming given added final design work for EMWD’s Murrieta Road Transmission Pipeline


Gannett Fleming will have added tasks in completing the design of the Eastern Municipal Water District’s Murrieta Road Transmission Pipeline.

A 3-0 EMWD board vote Wednesday, July 1, with board members Stephen Corona and David Slawson unable to participate in the meeting, amended the final design contract. Gannett Fleming, which is based in Pennsylvania and has an office in San Marcos, will be paid an additional $39,845 for the increased final design work.

Eastern is expanding its desalination capacity. EMWD’s Perris II Desalter is scheduled to begin operation in June 2021 and will have a capacity of 5.4 million gallons per day, and the Murrieta Road Transmission Pipeline will create additional capacity to transport flows from the Perris II Desalter. The Murrieta Road Transmission Pipeline consists of approximately 6,800 feet of pipeline at 36 inches in diameter, and pipeline at 42 inches in diameter will be used for the crossing at Salt Creek.

Gannett Fleming received the preliminary design contract after approval at a May 2019 EMWD board meeting. The preliminary design contract was for $398,402. In November 2019, Eastern’s board approved a $397,644 final design contract with Gannett Fleming.

The completed activities of the final design process include identifying the need for additional engineering services due to Menifee’s permitting requirements. The initial final design findings also included the potential to optimize the design of the Perris Valley South Pipeline and its related bypass. EMWD staff and Gannett Fleming negotiated a scope of work and fee for the additional final design tasks.

The additional work will modify the eventual construction bid documents to include the optimization of the Perris Valley South Pipeline, including the modification of the estimated project cost as well as changes to the plans and specifications. A singular cathodic protection system will be part of the final design work, and Gannett Fleming will also update the traffic control plans for the construction.

Gannett Fleming will use three subcontractors for the final design tasks. Darnell and Associates, which is based in San Diego, will perform traffic control design services. RF Yeager Engineering of Lakeside will be responsible for corrosion prevention design services. The San Marcos office of Black and Veatch will perform pipeline design services.

The revised work was circulated for public review between March 10 and April 9. The EMWD board approved the environmental initial study and mitigated negative declaration at the May 20 meeting.

The final design is expected to be complete in August 2020.

Joe Naiman can be reached by