HomeServicesCase StudiesAbout UsContact ZW3

Contact Us
ZW3INC Case Studies
Here are some examples of our work. 
Please contact us with your specific requests, and we will prepare a free estimate.
Or for more information, call us at:  951-623-9632

Or send inquiries to:
   1177 Idaho Street Suite 202
   Redlands, CA 92374
Project: Replace and double capacity of current equalization basin within the same footprint
Client: City of Corona
The project involved replacing the existing equalization basin within the same footprint (increasing the capacity from 1.2 MG to 2.4 MG) and designing/constructing new facilities for a plant capacity of 15 MGD. In 2004 the City of Corona started construction on wastewater treatment plant improvements and recycled water project A.  Recycled Water Project A required its recycled
water storage-pumping-conveyance facilities to achieve a 100% reuse of up to 15 MGD of tertiary treated recycled water with post-tertiary chlorination, matching the plant's existing capacity to generate recycled water.

Mr. Weinstock successfully led the final design and construction phase services for three simultaneous construction contracts for wastewater treatment plant improvements, as well as recycled water storage, pumping, and conveyance systems.  the original project included 147,000 linear feet of recycled water pipelines (with up to 317 psi working pressure), pump stations, pressure reducing stations, and five buried or partially buried pre-stressed concrete cylindrical reservoirs.

Work also included six board and jacked railroad crossings, bridge crossings, a pressure reducing station, and to booster pump stations and reservoirs.

The final construction cost for the three construction contracts resulted in a4% savings under the original construction bids of 38 million. The final cost of engineering fees resulted in a 6.7% savings under the $2.4 million engineering/management budget.

​In addition, Mr. Weinstock conducted negotiations between owner and to contractors for $4.4 million in construction contract change orders for adding chlorine contact tanks, recycled water reservoirs, and electrical improvements to the original construction contracts. Weinstock engineered and managed the design and construction of these facilities as add-ons to the original construction contracts.

Mr. Reichenberger assisted Mr. Weinstock in troubleshooting a problem of meeting CT in the contractor, based on tracer testing. He recommended that some baffling be installed in the contractor.