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2 R.O. SUPPLY WELLS FOR NORTH_ BEACH_ WATER PLANTS <br />The Board reviewed memo from the Utilities Director: <br />DATE: JANUARY 15, 1990 <br />TO: JAMES E. CHANDLER <br />COUNTY ADMINISTRATOR <br />FROM: TERRANCE G. PINTO <br />DIRECTOR OF UTILIT SERVICES <br />SUBJECT: CONSTRUCTION OF TWO REVERSE OSMOSIS WATER <br />SUPPLY WELLS FOR INDIAN RIVER COUNTY'S <br />NORTH BEACH WATER PLANT <br />PROJECT NO. UW -89 -10 -DC <br />PREPARED AND STAFFED BY: WILLIAM F. McCAIN� <br />CAPITAL PROJECTS EER <br />DEPARTMENT OF UTILITY SERVICES <br />BACKGROUND <br />The North Beach Water Plant currently has treatment capabilities of <br />.approximately .5 million gallons per day (MGD). Its current raw <br />:water source consists of two lower Floridian aquifer wells, one of <br />.,which should not be used due to the extremely high salt content. <br />F-jSince one well is virtually unusable, we find ourselves in a <br />_Z critical situation with regard to a backup raw water source, as is <br />required by the Department of Environmental Regulation. This high <br />..--:salinity well can be used for short_ periods-__.__of.____.time; however, <br />:.=production is greatly reduced, and the membrane life suffers. Also, <br />­,' we will soon be expanding the existing plant by 1 MGD to accommodate <br />:;the new development in the North Beach area. This will also require <br />=�.an expansion of the well field. <br />ANALYSIS <br />mak- <br />-.t -To increase the water treatment capacity by 1 MGD, it is necessary <br />-...to provide an increase of approximately 1.33 MGD of raw water <br />capacity. The wells need to be in place prior to design of the <br />treatment expansion, as the water quality must be ascertained to do <br />:the design. <br />When this item was first brought before the Board of County <br />. Commissioners at the end of September, it was requested that several <br />items be looked into, and the agenda item was tabled. The items to <br />be addressed are as follows: <br />1. Option of using the existing Wabasso well field and <br />associated transmission main as a raw water supply. <br />2. The cost of engineering for irrigation versus municipal <br />water supply wells for reverse osmosis processing. <br />_`'Attached to this agenda item, please find copies of two reports <br />addressing the above comments. The staff of the Utility Department <br />feels that these reports justify not only the project itself, but <br />.the engineering costs associated with the project as well. We are <br />bringing two Work Authorizations to the Board of County <br />Commissioners for consideration. The first Work Authorization has <br />the lump sums that were listed (in the original Work Authorization) <br />for permitting and construction changed to upper limits. The second <br />Work Authorization has eliminated all resident inspection time. The <br />costs associated with these Work Authorizations are as follows: <br />Work Authorization No. 1 = $56,881.00 <br />Work Authorization No. 2 = $25,000.00 <br />45 BOOK <br />JA it JJ0 <br />