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BOOK M PAGE 273 <br />BACKGROUND <br />The South County Water Treatment Plant has been producing potable water for approximately <br />18 years. Raw water is supplied by six wells constructed into the Florida Aquifer. Wells 1 <br />through 3 were the initial wells constructed with the plant and Wells 4 through 6 were installed at <br />a later plant expansion. <br />Potential problems with the wells were identified and monitored by County operations staff. <br />Semiannual cartridge filter replacements were becoming more frequent, and at its peak, cartridge <br />filter elements were replaced weekly to avoid damage to the reverse osmosis membrane units. <br />Each filter change costs approximately $2,000. <br />ANALYSIS <br />Camp Dresser & McKee, Inc., (CDM) the County's continuing consultant for water treatment <br />and distribution facilities was contacted and aided in troubleshooting the problem suggesting <br />laboratory analysis of the material accumulating in the filters. It was determined through a <br />review of past records that a well maintenance program was long overdue. Well maintenance is <br />necessary to preserve the physical and mechanical operating conditions of the well. Laboratory <br />analysis and isolation of wells are ongoing to prioritize well rehabilitation efforts. Based on this <br />information CDM will formulate a work plan for well rehabilitation and identify necessary <br />improvements. Staff will then seek authorization for the contracted well rehabilitation work <br />specified by the results of the attached Work Authorization No. 11. Authorization for "Phase II" <br />will follow once Phase I Work Authorization No. 11 has been completed. <br />CONCLUSION AND RECOMMENDATION <br />It is staff's recommendation that the Board of County Commissioners approve Work <br />Authorization No. 11 (Exhibit A) for engineering services for well system evaluation at South <br />County Water Treatment Plant to CDM for the upper limit amount of $15,000. <br />GR/c <br />Attachments <br />ON MOTION by Vice Chairman Ginn, SECONDED BY <br />Commissioner Stanbridge, the Board unanimously approved <br />Work Authorization No. 11 for engineering services for well <br />system evaluation at South County Water Treatment Plant to <br />CDM for the upper limit amount of $15,000, as recommended <br />in the Memorandum. <br />May 2, 2000 <br />WORK AUTHORIZATION NO. 11 IS ON FILE <br />IN THE OFFICE OF THE CLERK TO THE BOARD <br />88 <br />