DSRSD – Eastern Dublin Trunk Sewer II
WBA provided detailed general and civil design of approximately 2,100 ft of new 36" gravity trunk sewer in Eastern Dublin for the Dublin San Ramon Services District (DSRSD). The trunk sewer design included a creek crossing and was coordinated with and constructed prior to a major expansion of Dublin Boulevard by the City of Dublin.

Because of its distance from the District’s wastewater treatment plant and the presence of the creek, the sewer was relatively deep – up to 25-feet below grade. In addition, a thick layer of saturated sand extending over one-half of the total length was discovered by the soil borings made as part of the preliminary design phase. As a result, extra effort was taken during the detailed design phase to properly define the extent of the project potentially subject to difficult construction conditions. Both the Tassajara Creek and Tassajara Road crossings were accomplished with minimum disruption to traffic and the environment by using bore and jack methods.

SFK – Sewer System Master Plan
WBA completed a Sewer System Master Plan for the Selma-Kingsburg-Fowler County Sanitation District (SKF) in Fresno County in 2001. SKF serves a population of over 25,000 in three adjoining cities in Fresno County. The service area contains approximately 7.5 square miles and has about 138 miles of pipe up 48-inches in diameter. For this work, we used the Hydra Version 6.0 software and coordinated the acquisition of digital orthographic data for the area. Over 1,800 manholes were surveyed and located using GPS to the manholes to be incorporated into the digital orthophotos.

WBA calibrated the model from data collected from 7 metering station as well as 9 pump stations. Based on the modeling, we were able to identify diurnal and peak flows, and groundwater infiltration and inflow volumes. We identified those sections of the system that would not accommodate the projected 2020 flows. We found a few sections of pipe that sloped in the wrong direction. The plan concluded with recommendations for the size and the timing of system modifications.

DSRSD – Parks RFTA Sewer Replacement
The Dublin San Ramon Services District (DSRSD) entered into a contract with the U.S. Army to own and operate the water and sewer utilities on Parks Reserve Forces Training Area (Parks RFTA). Part of the agreement called for the District to rehabilitate the majority of Parks RFTA’s sewer system that was over 50 years old and severely deteriorated. WBA assisted the District with a video inspection of the lines and recommended replacing about 25,000 feet of pipes. The recommended replacements eliminated about 10,000 feet of unused pipes and located the remainder under dedicated streets rather than in open fields and under buildings. WBA completed the initial design project, which involved installing about 15,000 feet of 8-inch through 21-inch diameter line including about 200 feet of bore and jack pipe.

Recycled Water:

• Recycled Water Planning & Design
• Recycled Water System Regulatory Permitting
• Ultraviolet (UV) Disinfection & Filtration Projects

Wastewater:

• WWTP Design
• Ultraviolet (UV) Disinfection
• Disinfection/Sodium Hypochlorite Design
• WWTP Planning
• Pump Stations
• Wastewater Collection Systems
• Odor Control & Air Toxics

Water Supply:

• Pump Stations
• Reservoirs

Specialized Areas:

• Program Management & Engineering Management
• Construction Management
• SCADA
• O&M Consulting