1. Water Treatment Plant No. 2 Concentrate Zero Liquid Discharge

2. Water Treatment Plant No. 2 • Membrane Softening Water Treatment Plant completed in 1992. • Upper Floridan groundwater wells provide the source water for treatment. • Treatment process produces concentrate or “byproduct” stream. • Concentrate is currently discharged into the Royal Palms Waterway.

3. Map of WTP 2 and Discharge Point

4. Water Treatment Plant No. 2Permitting • The current permitted production is slightly more than 6.3 Million Gallons per Day (MGD.) • The amount of source water required to obtain 6.3 MGD of finished water is 7.5 MGD. Concentrate Groundwater Byproduct water ~1.2 MGD Permeate Drinking water ~6.3 MGD

5. How did we get here? • EPA determined the current concentrate discharge method is not allowed by the Clean Water Act. • FDEP notified the City via an Administrative Order on May 1, 2008 that the concentrate disposal permit would NOT be renewed. • The Administrative Order requires the City to devise an alternate method of disposing of the concentrate.

6. How did we get here? • An evaluation of concentrate disposal alternatives based on costs and regulatory compliance was completed 2009. • Selected Zero Liquid Discharge (ZLD) for a Pilot Study based on evaluation results. • ZLD Pilot Study confirmed the treatability, feasibility, and economics as favorable in 2010. • Selected McKim and Creed Engineers to design and permit the ZLD process in October of 2011.

7. What is Zero Liquid Discharge (ZLD)? • A lime softening/filtration process that treats the concentrate stream to remove excess mineral content. • The ZLD treated finished water is blended with finished water from the water plant. • Excess minerals are removed by the process and are contained in the dewatered lime sludge (similar to WTP#1) and hauled off-site. • The new ZLD Process will be integrated into the existing water treatment plant and will operate as one facility.

8. Action List • The City advertised the ZLD project for bid in May 2012 and received 6 bids. • Wharton-Smith Construction (builder of WTP#3) was the lowest bidder with a price of $9,542,000.00. • Wharton-Smith Construction will hold their price even though the bid opening was held over ten months ago in June 2012.

9. Project Benefits • Achieves regulatory compliance. • Increases water plant design capacity by ~1.2 MGD(equal to 3 wells). • Eliminates discharge permit and associated sampling costs. • Meets the Consumptive Use Permit requirement for Alternative Water Supply. • Incorporates City’s green initiatives by conserving water, recovering and using a byproduct water while providing an environmentally sustainable solution. • Delays costs associated with future expansions.

10. What do we do now? • Propose to split the contract into two phases to allow for pre-construction activities to begin while sale of the 2013 bond issuance is completed. • Phase 1: Pre-Construction Services Only. Cost: $100,000.00 • Phase 2: Construction Services. Cost: $9,442,000.00 • Adopt “Resolution to Award” • Adopt “Resolution for Bond Fund Reimbursement” (legal requirement to use 2013 bond revenue)

11. Project Schedule • Award construction contract/phased plan: May 2013 phase 1, July 2013 phase 2 • Competitive sale and award of bonds takes place - June 11, 2013 • Bond Closing completed - July 9, 2013 • Estimated Substantial Completion and Administrative Order compliance: September 2014