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171 f hthan River Cc unty Uf ifi"es Concentrate Disposal Op6ans UAB Response. The UAB recommended against this option at the May 4, 2000 meeting as it does not remove or divert discharge from the Indian River. 3.10 Modification of Discharge Point The discharge ,point could be modified by installing a tee with diffuser legs on the outfall. The modified outfall would cause the concentrate to be less concentrated by discharging over a greater area. This is a low cost solution but may be influenced by the tides which dcfine'ttie water velocity in the Indian River Lagoon at die County Road 510 Causeway. UAB Response: The UAB recommended against this option on May 4, 2000 as it does not remove or divert discharge from the Indian River. 3.11 Mixing in Discharge pipe Mixing in the discharge pipe is similar to the mixing zone / ion imbalance solution above. Water from the Indian River Lagoon would be pumped into the existing concentrate pipe and blended before being discharged into the receiving water. This would dilute the concentrate with river water so the ion imbalance would be greatly reduced at the discharge point. The mixing would render the effluent tolerable to the indicator species used in the toxicity testing. The use of this solution would require the construction of a pump station to draw in the proper amount of river water in proportion to the concentrate being disposed. The -river water would then be thoroughly mixed using a static in line mixer to bring the ions in solution closer to the ratios found in the river. Toxicity testing samples would be taken at the discharge point. UAB Response: The UAB recommended against this option on May 4 as it does not remove or divert discharge from the Indian giver. 3.12 Additional Membrane Stage A third membrane stage would reduce the volume of concentrate to be discharged. Since the concentration of the ions in the reject water is much lower than that of the receiving water, increasing the concentration of ions would decrease the amount of receiving water required to bring the mixture into balance. A third stage would provide better quality finished water. The increased finish water quaiity would allow a greater amount of bypass water to be blended with the finish water. The higher concentration of salts in the brine would also have the effect of reducing the amount of concentrate flow to the river. A third stage would increase the ion concentration to those closer to the concentrations found in the receiving water. CDM Camp D,ewr&',IcKce Inc M3M1j9.11Aam