Sewer Capacity Relief Project Yorba Linda Water District

City of Yorba Linda

As the Yorba Linda area of Orange County expands from a rural area to an emerging planned development community, its infrastructure support needs to expand as well. Hall & Foreman studied the impact of development planned for the northerly section of the city. The study analyzed the current system, which was constructed in the 1960’s, and concluded additional capacity was needed. To meet an expedited construction schedule, Phase I and II of the project ran simultaneously allowing Phase III to begin upon their completion. 

Although atypical for sewer construction, jack and bore was selected as the best method for about 700 feet of the two-mile long project site. This method was chosen to minimize disruption to the existing utilities and roadway by allowing the work to be performed at a depth of 30 feet. In areas that allowed trenching, excavations of depths between 20-25 feet were common. The challenges of the soil and limited access were overcome through the use of multiple stacked trench shields that were installed for shoring.  To shore the manholes, corrugated metal was formed into shafts and inserted into the ground so the manholes could be constructed.

Awards:

Engineering Project Achievement Award, American Society of Civil Engineers Orange County Branch

Engineering Project Achievement Award, Orange County Engineering Council