9/24/1991 - Laserfiche WebLink

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s � � DATE: AUGUST 20, 1991 TO: JAMES E. CHANDLER COUNTY ADMINISTRATOR FROM: TERRANCE G. PINT DIRECTOR OF UTI4/ SERVICES PREPARED WILLI M q .gAIN AND STAFFED CAPCTS ENGINEER BY: DEP Q;;g T OF UTILITY SERVICES SUBJECT: ENGINEERING SERVICES FOR PHASE II EXPANSION OF THE SOUTH COUNTY REVERSE OSMOSIS (R.O.) PLANT BACKGROUND As part of the current Phase I expansion of the South County R.O. Plant, we have installed 3 Million Gallons Per Day (MGD) of new low pressure process membranes. One of the conditions placed on the County as part of the permitting process for this plant was treatment of the brine stream from the R.O. process prior to discharge into Florida waters. Preliminary design and testing of a brine treatment system is now complete, and we must now proceed with bidding and construction of this facility. Also, to maintain the current permitted production level at the South County Plant, and due to the pressing need for expansion (i.e., the Comprehensive Plan), we must evaluate replacement of existing old membranes or expansion (see attached memo to Harry Asher dated 9/j/91). We have already begun the expansion process by initiating the expansion of our well field at this site. A Work Authorization was approved with Vost, Buckley, Schuh, and Jernigan, Inc., on May 21, 1991 by the Board of County Commissioners to design and permit a well field expansion (see attached agenda items). We now wish to proceed with design and permitting of a second expansion of the South County R.O. Plant treatment capacity. The two Alternatives currently available to the County are as follows: Alternative A: The replacement of the existing.high pressure 2 MGD original duPont skids with 3 MGD of "low-pressure membranes. Alternative B: The replacement of 75% of the failing duPont membranes in the existing skids. We are proposing to replace the existing 2 MGD of capacity (four original .5- MGD high pressurd duPont skids; Alternative A --see attached spreadsheet) with two 1.5 MGD skids (low pressure softening membranes). This project will accomplish several things: first, it will replace our existing 2 MGD high pressure membranes with low pressure/softening membranes; secondly, it will raise our capacity by 1 MGD and substantially lower the plant's operation and maintenance costs. In reviewing these Alternatives, it must be realized that Option B at the very least must be done to maintain existing plant capacity, along with the additional minor improvements outlined in the Work Authorization and spreadsheet. ANALYSIS Attached is a copy of a spreadsheet prepared and Indian River County staff relative to available to the County. As demonstrated by by Camp Dresser & McKee the two alternatives this analysis, the cost SEP 2.41 N91 79 R0CK. a F:' 'TUU r-