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i WATER; SERVICES OF AMERICA, Inc. Mr. Terrance Pinto Utilities Director South Indian River County RO Plant Utilities Department P.O. Box 1750 1840 25 th Street Vero Beach, Fl. 32960 Dear Mr. Pinto: Rte: R.O. Plant Modification Capacity Increase WSA Proposal No. 5865 April 1991984 As a result of our past discussions on the proposed modification of the Indian River Reverse Osmosis P1ant,I have prepared the - following summary of several of the key points which should be considered during the evaluation of our proposal. The WSA proposal for plant modification consist of the addition of - seven (7) ten inch -B-9 DuPont membranes to each of the four membrane racks currently in service. This addition will increase the capacity of each membrane rack by 165,000 GPD for a total plant increase of 660,000 GPD. The existing RO plant was purchased for a total of p 1,217,091.00. This equates to about $ 0.61 per gallon per day capacity. The proposed modification will increase the total plant capacity by 660,000 aDafr only $ 175,000.00 or only 0.26 per gallon per day capacity. y. Since the cost of the original plant included several items sized for ultimate plant expansion, it may also be helpful to compare the cost of the proposed modification to the cost of purchasing a new system sized for 660,000 GPD capacity. Such a plant would cost approximatly $ 380,000.00. The porposed modi�icatio will provide the same cacacity increase for less than half the cost of a seperate system . Another significant savings results from the fact that the Proposedc�modification will increase the plant capacity by about 25,/ without any increase in total power consumption. The energy required to feed the additional membranes is currently being wasted accross a feed pressure control valve. By utilizing this wasted energy, the proposed modification will reduce the specific electrical consumption cost from about $ 0.51 / 1000 gallons to about a 0.41 / 1000 gallons. Additional savings will also be realized since the increase in RO capacity will also increase the blend water capacity while not increasing the operating cost. This proposal reflects special pricing by DuPont for membranes they wish to provide for close field service monitor- ing. DuPont wishes to start the collection of data as soon as possible. Therefore this offer is for acceptance within thirty (30) days, with delivery and installation of the first 70 RAY 16 1994 _ BOOK 57 PACE103