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ATTACHMENT B <br /> SCOPE OF WORK <br /> SOUTH COUNTY WATER TREATMENT PLANT <br /> WELL REHABILITATION SERVICES <br /> Backg1ound <br /> Indian River County Utility Services contracted with Camp Dresser & McKee Inc. (CDM) in <br /> May 2000 to investigate accelerated cartridge filter clogging at the South County Water <br /> Treatment Plant. This was the first of four work authorization to assist the County in assessing <br /> the condition of the wellfield and improving its reliability. Records indicated that major <br /> components of these wells had not undergone major service since they were initially installed <br /> up to twenty years ago . Previous work authorizations investigated field conditions and <br /> included removal and inspection of the pumps, specific capacity testing, video inspection of <br /> wells, pump and valve rebuilding, restoration of wells to service, acidization, redevelopment, <br /> well borehole reaming, disinfection, well column extensions, and flow meter acquisition. In <br /> some instances, plans for installation of new equipment or rebuild of existing equipment were <br /> modified as a result of pump failures . CDM and subcontractors worked with County staff to <br /> ensure that the plant's level of service was maintained especially during drought conditions . <br /> CDM prepared and submitted to County Utilities staff a summary of well rehabilitation work <br /> performed to date in August 2002 along with monthly and five-year maintenance <br /> recommendations . Additional recommendations were identified in order to enhance operations <br /> and to account for declining regional water levels . <br /> Services <br /> CDM has prepared this work authorization for well rehabilitation services to assist County staff <br /> in efforts to complete the upgrading of various wellfield appurtenances and equipment. <br /> Task 1 - Rehabilitation of Existing Wells <br /> Well column extension to 100 feet is necessary to account for the declining regional water table <br /> elevations and to reduce the risk of air intrusion. The following is required at each well : <br /> Well No. 1 <br /> Extend well column - 20 feet <br /> Modify pressure siistaining valve (by existing contract) <br /> Install telemetry system <br /> Install flow meter (by existing contract) <br /> Change packing glands to mechanical seal <br /> Well No. 2 <br /> Extend well column - 40 feet <br /> Modify pressure sustaining valve (by existing contract) <br /> Install telemetry system <br /> Install flow meters (by existing contract) <br /> Change packing glands to mechanical seal <br /> B - 1 mh 1092.doc <br />