Twin Oaks Reservoir Tank No.2, Vista, CA

Tank No. 2 at the Twin Oaks Reservoir in Vista is the largest pre-stressed concrete storage tank in the world, standing 40 feet-high. The inside diameter of the tank is 432 feet with a total holding capacity of 40 million gallons. Additionally, 249 miles of prestressed wrapping strand, 22,950 cubic yards of concrete, and 575,000 pounds of steel.  The Project was completely buried and landscaped to blend in with the surrounding community.
 
Geotechnical Services: Geotechnical Investigation for Tank Foundation Design, Geotechnical Observation & Testing During Foundation Construction  
 
Special Inspection & Materials Testing: Concrete