Dibble provided Design Program Development for approximately eight miles of new water transmission main ranging in size from 48-inch to 72-inch. The new pipeline program delivers water from the Val Vista Water Treatment Plant to three reservoir and booster pumping facilities serving the City's largest pressure zone. The project is divided into three phases. Program development included design concept analysis and design standard development for all three phases as well as corridor analysis for Phase 1.
Dibble provided detailed design and construction document development for Phase 1 of the Val Vista Water Transmission Main. Design tasks included utility coordination and potholing, easement coordination and acquisition assistance, construction plan and specification preparation, constructability analyses, and multi-agency permitting.
Dibble designed approximately four miles of the new 36-inch water transmission main along Buckeye Road from 35th Avenue to 67th Avenues. The new 21,000 LF pipeline will provide additional water transmission capacity and system redundancy to the western part of the City's service area. Initial evaluations were performed to consider route feasibility and pipeline corridors. The selected corridor requires coordination with utilities as well as several other significant stakeholders. The proposed route is a major truck route, requiring special traffic control measures and significant public outreach efforts. Dibble's team employed a balanced approach to address both technical design considerations as well as stakeholder considerations; keeping the project on-track and on-budget for design completion.
The Avra Valley Augmentation Transmission Main (AVATM) provides supplemental and redundant water transmission capacity to convey water from western water production facilities and the Hayden-Udall Water Treatment Plant to the central zones of the water distribution system. Dibble led a comprehensive team to evaluate the feasibility, route, and implementation strategy for the transmission main. The 13 mile pipeline will be constructed in three phases. Program considerations included technical evaluations of pipeline hydraulics, surge potential, viable pipe materials, and permitting requirements; environmental evaluations of hazardous material potential, endangered species and historic preservation requirements; and societal evaluations including traffic and neighborhood impacts. The program recommendations will serve as the guiding document for design and implementation of the new transmission pipeline system.
Reservoir No. 7 was determined to be at the end of its useful service life. Dibble provided a replacement alternatives analysis to evaluate alternative reservoir configurations and determine the preferred design for the new reservoir and pumping facility. Dibble provided comprehensive design and post- design services for a new 2MG concrete reservoir, 4,000 gpm booster pump station, disinfection facilities, generator, reservoir spray mixing system, and site security improvements. Close coordination with surrounding residents and significant public outreach following the Town's standard processes were integral to project success. As part of the project, the existing well was rehabilitated, brushed, flushed, and extended to the new surrounding grade. A new well pump delivering 1,200 gpm was designed, with accompanying yard piping.
As part of the offsite infrastructure improvements associated with the new John C. Lincoln emergency care facility located at Sonoran Crossing, Dibble designed a new sanitary sewer lift station. The station was designed with built-in flexibility to accommodate anticipated growth from the current 0.25MGD peak capacity to a build-out capacity of 1.0MGD without changing wetwell or piping configurations. Excellent communication and coordination between the Dibble team, the City, the Developer and the Contractor allowed the facility to be designed, constructed and commissioned in less than nine months from start to finish, preventing a delay in the opening of the critical new emergency care facility.
Felix Construction and Dibble Engineering were selected as the Design-Build team to construct 5 miles of 12" effluent pipeline from the Central Buckeye WWTP to the Sundance WRF. The primary goal of this project is to provide pipeline and pumping infrastructure to allow the City to capitalize on the A+ quality effluent resource that the CBWWTP and SWRF are generating by expanding their reuse and recharge operations in order to accrue long-term storage credits through the Arizona Water Bank. The City intends to accomplish this by constructing an new 12-inch effluent pipeline that will run from the CBWWTP and connect to the 20-inch effluent pipeline (five miles) that runs from the SWRF to the BWCDD Canal. Modifications and improvements are required at the effluent booster pump stations. The City of Buckeye received WIFA funding to design and build this new infrastructure.