Eleven Steel Tanks Analyses and Evaluations

• Owner: Camrosa Water District

Camrosa Water District is located in Ventura County, California and provides potable, non-potable and reclaimed water to more than 30,000 residents, commercial and industrial developments, and farms. Camrosa Water District provides approximately 14,000 acre-feet of potable water per year through its distribution system, which is comprised of 130 miles of pipelines, 11 reservoirs, and 5 pump stations.

A majority of the distribution system components, including reservoirs have been designed by Perliter & Ingalsbe since 1950s. Camrosa Water District determined and engaged Perliter & Ingalsbe to evaluate its eleven existing steel tanks for structural integrity and required structural and general improvements. These included the following steel tanks.

• Reservoir 1A   2.00MG
• Reservoir 1B   3.00MG
• Reservoir 2A   0.75MG
• Reservoir 2B   1.25MG
• Reservoir 3A   2.50MG
• Reservoir 3B   1.00MG
• Reservoir 3C   1.00MG
• Reservoir 3D   1.25MG
• Reservoir 4A   2.00MG
• Reservoir 4B   0.55MG
• Reservoir 4C   1.00MG

Major Components and Special Features:

• Perform site visit and field investigations
• Review record drawings and shop drawings
• Obtain geotechnical and geoseismic reports
• Perform structural and seismic analyses and evaluations of eleven existing steel tanks
• Identification of structural deficiencies and development of required structural improvements

• Recommendations for tank foundation and anchorage systems
• Evaluation of inlet, outlet, overflow, and drain piping and recommendations for required modifications to ensure better performance during earthquake event
• Evaluation of existing reservoir appurtenances, and general site features and recommendations for required improvements
• Evaluation of existing paint systems and recommendations for repairs, or removal and replacement
• Establish construction priority

Following these analyses and evaluations, capital improvement projects for many tanks have been completed and will continue for the remaining tanks.