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The concentrate discharge from the R.O. process will be routed to the North Regional Wastewater Treatment Facility (NRWWTF). A portion will be mixed with reuse water and supplied to golf courses for irrigation. Implementation of this use could reduce the concentrate discharge into the Lagoon by 37,000 gpd (from 750,000 gpd to 713 ,000 gpd), or 5%, adding to the irrigation quality water available. Implementation of the third stage membrane will be conducted in two phases. The first phase will involve setting up a pilot plant to determine the appropriate type of membrane to optimize the amount of potable water recovery. Another portion of the concentrate will be routed through the pilot plant. Based on discussion with various membrane consultants, it may be feasible to recover an additional 10% of permeate (from 80% to 90% plant efficiency), which would reduce the volume of concentrate by 50%. The pilot plant will be constructed in a mobile unit and located at NRWWTF for the study. The mobile unit will allow for the pilot plant to be relocated to other facilities in the future. - Successful implementation of the third stage membrane process could result in approximately 441 ,000 (based on a 15% blend ratio) gallons per day (gpd) of additional potable water produced. Furthermore, this could reduce the amount of concentrate discharged into the Indian River Lagoon by 375,000 gpd. The concentration of the brine discharged into the river will be twice as high as what is presently being discharged. The modified discharge into the river will have to be permitted by the DEP. The pilot project costs are estimated as follows : II Reclaimed Water Mixing with Brine Material and Labor $ 100,000. 00 Engineering, Permitting and Lab Work $ 1001000. 00 15% contingency $30.000. 00 Total Project Cost $2309000.00 Construction of 3'd Stage Membrane Pilot Plant Material $ 15 ,800. 00 Labor $57200. 00 Utility Trailer $82000. 00 Engineering, Permitting and Lab Work $351000. 00 15% Contingency $9.600. 00 Total Project Cost $73,600.00 The total project cost as outlined above is $303 ,600. 00. The County will request an initial grant of $ 151 , 800.00 (50%) through two applications. The County' s total share will be funded from the capacity charge fund, Account Number 472-000469483 . 00. Implementation of the full scale, third stage membrane process at NCRO is estimated to cost $ 1 .2 million. Staff anticipates that it will take approximately one year to evaluate the data to determine if the full scale, third stage is feasible. At that time staff may request approval to apply for another grant and proceed with the project. Implementation of the pilot to convert concentrate to liquid bleach for disinfection will be pursued next grant cycle depending on the success of the 3'd Stage membrane pilot. RECON04EENDATION The staff of the Department of Utility Services recommends that the Board of County Commissioners approve the grant application, authorize matching funding of construction of the projects outlined above (upon receipt of grant), and authorize the Chairman to execute applications and agreements associated with grant, as presented. DECEMBER 59 2000 BK 1 16 FG J16 - 74-