110-MGD Water Blending FacilityPinellas County | November 2012
For this project Jones Edmunds designed a phased approach to implement a water quality blending, attenuation, and chemical treatment facility to resolve water quality problems in the Pinellas County Water System (PCWS) after conversion to chloramine disinfection in 2002. Pinellas County receives water from Tampa Bay Water from three sources—groundwater, surface water, and desalinized water. The varying blends of water from these sources cause widely fluctuating water quality changes within the PCWS. The WBF is intended to attenuate these water quality changes. The facility has a design capacity of 110 MGD. The Basis of Design included a water quality study; blending studies; and other analyses for a proposed detention, blending, and minimal treatment facility. The report also included a review of project delivery options to identify the most cost-effective and efficient delivery method for this project. Key components include two 10-MG mechanically mixed prestressed concrete blending/attenuation tanks (slated for Phase 2), chemical feed, and mixing facilities for six separate chemicals, a new high-service pumping station with two 10-MG mechanically mixed ground storage reservoirs, an Operations and Security building (designed to withstand a Category 5 hurricane wind), and other related structures. To complete project tasks, Jones Edmunds prepared plans, specifications, and permits, and performed hydraulic modeling as well as coordinating and providing support for public meetings. The facility is designed to accommodate membrane treatment facilities in the future, as required. The facility design is complete and ready for bidding for the spring of 2009.