65B - PROPOSED WATER AND SEWER RATE ADJ

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124 WATER RATE STUDY I City of Santa Ana, CA INTRODUCTION The final step in this assessment process is to calculate the overall inspection and replacement cost for each asset. The inspection costs were calculated at $150,000 per mile for all pipe diameters. Average facility replacement cost look -up tables were used to determine overall budgetary estimates and schedules (see Table C - 1 below). Construction cost (2012 dollars) values were based on an informal survey of Southern California utilities in recent years, and inspection costs were based on estimates from nation -wide projects. Specific cost estimates based on experience in Santa Ana were not available at the time of printing. Replacement costs were not specific to pipe material, and replacement was assumed to be the same diameter. Pipe segments with a diameter of 0 or unknown were replaced with a 6 inch pipe. Costs also assume basic construction practices, including imported sand bedding and backfill, compaction, pavement removal, hauling, shoring, trench excavation, testing and disinfection. Table C -1: Water Pipe Replacement Costs (2012 dollars) 2 $282.72 18 $435.57 4 $301.82 20 $454.68 6 $320.93 24 $492.89 8 $340.04 30 $550.21 10 $359.14 36 $607.53 12 $378.25 48 $722.17 14 $397.36 54 $779.49 16 $416.46 78. $1,008.77 Figure C - 1 shows the distribution of BRE scores (across the bottom) against the total estimated replacement costs. The cumulative replacement cost line is also provided. It must be emphasized that BRE scores calculated in this study were based on relative values and do not represent an absolute level of risk. As such, it is not possible to quantitatively determine an acceptable BRE target. As the City collects additional condition and failure information, further investigation is recommended to better characterize the risk relationship and define appropriate targets. 65B -136 NOVEMBER 2014