Springville Reservoir Modifications:
- Owner: Calleguas Municipal Water District
- Cost: $5,500,000
18 MG Springville Reservoirs A and B, designed by Perliter & Ingalsbe, were constructed in 1972 and 1989, respectively. In 2002 based on new geoseismic data of the region, an old and inactive earthquake fault near the reservoirs was found to be active and capable of producing a stronger earthquake than previously reported.
Perliter & Ingalsbe was engaged to perform seismic analyses of the reservoirs to determine their adequacy with respect to new geoseismic data, identify deficient components, and recommend required structural and site improvements. As first phase of the project, Perliter & Ingalsbe completed these tasks and provided recommendations for required structural and site improvements. In addition to structural improvements, electrical, piping, and general site improvements were also considered.
In the second phase of the project, Perliter & Ingalsbe performed detailed design of the proposed improvements and provided services during construction.
Major Components and Special Features:
Analysis and Evaluation:
- Structural and seismic analyses and evaluation of existing 18.0MG buried concrete reservoirs
- Identification of structural deficiencies and development of required structural improvements
- Evaluation of existing reservoir appurtenances, piping, electrical system, communication system, instrumentation, and general site features and recommendations for required improvements
Structural Improvements:
- Strengthening diaphragm walls
- Strengthening roof and wall connections
- Repairing cracks
- Installing a new wall for one reservoir
- Reducing load over the roof by replacing earth cover with lightweight materials
Piping Improvements:
- Installing new inlet/outlet pipe joints providing flexibility
- Constructing 30 feet deep vaults for piping flexible joints and valves
- Modifying overflow to meet California Department of Public Health (CDPH) requirements
- Modifying reservoir drains and sub-drains and installing new flow monitoring sensors
Electrical and Communications Improvements:
- Obtaining new power source for the reservoir site
- Obtaining new communication service for the site
- Providing new electrical and communication distribution systems within the site
- Installation of new instrumentation and controls
Security Improvements:
- Strengthening and securing reservoir access hatches and manholes
- Installing vehicle loop detector and intrusion alarms
- Installing surveillance camera system
- Installing chlorine analyzer
Site Improvements:
- Removal replacement of ac pavement, concrete curb, and gutter
- Placing new aluminum handrail
- Landscaping and irrigation system improvements