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Attachment #1 Work Order Number 12 West Wastewater Transmission System Project Description and History The Indian River County Department of Utility Services (IRCU) December 2004 Master Plan identified multiple Capital Improvement Projects (CIP) that will transfer a portion of the existing wastewater flows from the South Wastewater Treatment Plant (WWTP) to the West WWTP . The West WWTP is currently under expansion as part of this Master Plan to accept this additional capacity. In conjunction with other ongoing CIP Projects, the intent of Work Order # 12 is to consolidate several projects into one that will transfer wastewater capacity from the South WWTP to the West WWTP . Work orders #7 and #8 were authorized by the BCC May 17, 2005 which included the construction of a master pump station at 8'h Street and 58th Ave (Kings Highway) and installation of 21 ,000 lineal feet of 12" force main along 8th Street, respectively. Both work orders included survey, design, permitting, and a construction phase services for these projects. Shortly thereafter, work order # 10 was authorized by the BCC June 21 , 2005 , for the extension of the 8 'h Street force main further west from Kings Highway to 74th Ave. The remaining force main piping to the West WWTP was being designed by others and would complete the westerly transmission of flow to the WWTP . The purpose of these projects was to transfer flow and wastewater (WW) capacity from the South WWTP to the West WWTP . Through preliminary evaluation of the 8th Street corridor under work order #8, it became evident that the availability of right-of-way was limited, and the presence of existing utilities did not allow adequate space for construction of anew force main. Right-of-way was limited to 60 ft in some areas, and the presence of other utilities and existing water lines along this corridor did not allow adequate construction of a new force main due to sanitary setback requirements between water and sewer lines . Alternate routes along 12th, 4th, and V Streets were evaluated to determine a better alignment for the new force main . Through various meetings with staff, 4"' Street was identified as an alternate east-west route to direct WW flow west to 58th Ave (Kings Highway) . In developing this route, a separate project to rehabilitate and upsize the existing master WW pump station #89 located at the South RO water treatment plant site was being considered . Increasing the capacity of this pump station was needed to meet growing demands in the South system. LS#89 currently pumps WW to the South WWTP . Consultant recommended utilizing this station as a master pump station in order to pump wastewater West via the 4th Street force main extension already under design in Work Order #8 to the West WWTP. Since the intent of routing a new 12" force main west was to pick up capacity from the Eastern basin, which included numerous lift stations, ALL of these lift stations in the Eastern basin already pumped to LS #89 . This configuration of extending the 4th Street force main to LS 489 and upsizing the pump station provides several advantages : • Allows ALL of the Eastern Basin flow to be directed to either the South or West W WTP ' s F:AUtilities\UTILITY - ENGINEER INGAProjeets - Utility Construction PermitsVIRC - 8th Street PM Ext from IR BIV to 58th Av - UCP 2628 Work Order No . 12 to KH &AAA - Work Order No. 12 - March 29, 2006.doc Page I of 11