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Executive Summary <br />17.13. - Page 13 <br />HGU11UUH <br />GIN IIIEW.M." <br />qW <br />51LYCOl V 6 eAwa wr&N <br />Pipeline replacements should occur each year to spread the associated cost of these needed <br />replacements and avoid the potential for creating a costly infrastructure replacement backlog in <br />the fixture. These projects are important for maintaining LOS, and should be implemented, along <br />with fire flow improvement programs identified in the System Capacity and Operational <br />Reliability Assessment, so that the total pipeline replacement rate is the same as the existing <br />replacement program of 1.6 miles /year (0.6 percent of system piping), as a minimum. The <br />schedule for implementation beyond current rates is reasonably flexible, depending on available <br />funding needs. <br />Table ES -4. Summary of Recommended Pipeline Replacement Programs <br />P Descrip <br />PRP -1 Comprises the highest priority projects that replace older, small $5.6 <br />(e.g., 4 -inch) diameter mains with reduced hydraulic capacity, <br />significant leak histories, and /or highest benefit cost ratio, <br />within the 20 -year Master Plan timeframe. <br />PRP -2 <br />Replaces additional older, small diameter mains with reduced <br />$24.0 <br />hydraulic capacity. To reduce risk, this program should be <br />underway within the 20 -year Master Plan timeframe. <br />PRP -3 <br />Long -term replacement program to replace the City's 6 -inch <br />$107.9 <br />diameter and larger cast -iron mains. Many of these mains are <br />anticipated to have a long useful life remaining, so only a small <br />percentage of these pipelines are considered for replacement <br />within the Master Plan timeframe. <br />PRP -4 <br />Watch program for larger diameter metal main replacement. <br />$41.0 <br />Because these pipelines are generally in good condition and <br />are cathodically protected, it is anticipated that this program <br />would be implemented beyond the Master Plan timeframe. <br />PRP -5 to 7 <br />PRP -5 through 7 are "watch" programs for the City's asbestos <br />$217.2 <br />cement (ACP) pipe, which has not had a measurable leak <br />history ($58.7M), PVC pipe which is relatively new ($132.2M), <br />and other miscellaneous pipes that are anticipated to need <br />long -term replacement ($26.3M). Only a small portion of ACP <br />pipes and miscellaneous pipes are anticipated to require <br />replacement within the Master Plan timeframe. <br />Total <br />$395.7 <br />ES.6.4 Facilities Renewal /Replacement Evaluation <br />A Pipeline and Facility Renewal /Replacement Evaluation was performed for pump stations and <br />tanks using age design useful life, and condition information provided by the City to develop <br />improvement recommendations. <br />Table ES -5 summarizes the three Pipeline and Facility Renewal /Replacement Evaluations. <br />FRP -1 and 2 are anticipated to occur within the Master Plan timeframe. FRP -3 is a long-term <br />program beyond the Master Plan timeframe. A key finding of the analysis is that the City's pump <br />station and tank facilities are well - maintained and generally in good condition. <br />W E S T Y O S T A S S O C I A T E S ES -9 City of Redwood City <br />September 201 1 Water System Master Plan <br />o \c \369 \06- 09- 01 \wpAmpA052610_0ES <br />