The Mayfield booster pump station (BPS) was originally constructed in 1970 and had reached the extent of its expected service life. California American Water (CAW) had decided to replace the BPS with a modern premanufactured below-ground pump station that would alleviate several of the issues that were identified in the BPS condition assessment. The new BPS provides for more efficient operation with variable frequency drive (VFD) domestic water pumps; additional fire flow capacity to meet county requirements; emergency generator; ventilation; sound attenuation; and greater accessibility for maintenance. 

WHB Engineers provided preliminary engineering services that included hydraulic analysis of the closed-loop service area using the Water CAD model and projected demands; surveying, geotechnical investigation; and development of a Basis of Design Memorandum that identified several options and associated cost estimates. Close coordination with premanufactured vendors, USEMCO and EFI, resulted in a preferred installation with little impact to the surrounding residential area.   

Both premanufactured vendors were solicited for bids based on performance specifications and preliminary engineering drawings. WHB Engineers provided bid support review and recommendations for purchase by CAW. In the Final design phase, WHB Engineers provided construction documents for the civil, structural, electrical, and traffic control improvements to support the installation of the BPS. Construction support services included attendance at meetings, response to requests for information (RFI), and submittal review. 

One of the major challenges in the project were the existing site constraints. The original BPS had been located within a small 12ft x 15ft easement between two residential properties on a steep slope with relatively shallow rock bed. In 1991 and 1995 electrical improvements were made to the BPS that extended beyond the easement property lines. The new BPS required a greater area to support the additional pumps, emergency generator, and greater accessibility for maintenance.

During preliminary design an alternative was developed to relocate the pump station to the adjacent street and allowing for the existing easement to be used for the new emergency generator. The alternative design minimized impact to the existing residents by not requiring additional easement acquisition and still allowed for the installation of the new larger BPS within the street right-of-way (ROW) with all the CAW desired features.

Description: The Otay Crossings Commerce Park Sewage Pump Station will service the new Otay Crossing development located in East Otay Mesa. The lift station includes a 7700 gallon wet well with a 15,000 gallon emergency storage manhole and two 15 HP lift pumps each capable of 275 gpm of sewage flow.

WHB Engineers provided electrical and control systems design, including power, controls, site lighting, grounding, and maintaining County SCADA standards to maintain consistency across all facilities.

Services Provided: Topographic Study, Hydraulic Design, Civil Design, Architecture, Mechanical/HVAC Design, Structural Design, Electrical Design, I&C Design, Landscaping, Construction Cost Estimates 

Construction Value: $580,000

Description: Located adjacent in Cordata Park in Fountain Valley, California the Reservoir No.2 and Pump Station Rehabilitation project provides for the demolition of the existing 7,500 gallon per minute (gpm) pump station and design of the new Reservoir No. 2 pump station complete with 3 – 2,500 gpm vertical turbine pumps, variable frequency drives, dewatering pump, piping and valves, SCE electrical room, SCE transformer, installation of a standby generator and HVAC facilities.  Site improvements include, new concrete driveway and paver maintenance road; site grading, landscaping and irrigation improvements, park improvements, new sidewalks and miscellaneous utility lines and connections. In addition, the design work includes new appurtenances for the existing Reservoir No. 2.

WHB Engineers provided design services and preparation of contract drawings and specifications for demolition of the existing pump station, design of the new pump station and replacement of the Reservoir No. 2 appurtenances. Design disciplines for this project included civil, mechanical, architecture, structural, electrical, instrumentation and control and landscaping. WHB’s engineering services also included topographic surveying, geotechnical investigation and structural assessment of the existing Reservoir No. 2. With the new pump station located across the street from residential homes, special attention was given to architectural features, materials and color schemes. The project will also include construction of a new basketball court in the park, new lighting around the park playground areas and 19 new trees planted in the park. WHB’s construction management staff was assigned the task of preparing estimates of probable construction at the 30 and 100 percent complete designs. 

The WHB Engineers team met the challenge of designing a new municipal facility in a city park and residential development while maintaining the City’s need for a secure potable water pump station and reservoir that is aesthetically pleasing for the neighborhood. In addition, improvements included operational improvements for the City of Fountain Valley operation and landscaping department.

WHB Engineers was tasked with the design of a new Reservoir No. 2 pump station to replace a 7,500 gallon per minute (gpm) pump station in Fountain Valley, CA adjacent to Cordata Park.  The new pump station was located across the street from residential homes and needed to be aesthetically pleasing, leading to special attention being given to architectural features, materials, and color schemes.

WHB Engineers provided design services and preparation of contract drawings and specifications for the demolition of the existing pump station, the design of the new pump station and replacement of the Reservoir No. 2 appurtenances. The design incorporated improved access via a new concrete driveway and paver maintenance road and site grading.  To incorporate the necessary aesthetics, the design also incorporated landscaping, irrigation, and park improvements.

The WHB Engineers team met the challenge of designing a new municipal facility in a city park and residential development area while maintaining the City;’s need for a secure potable water pump station and reservoir that is aesthetically pleasing for the neighborhood.