65B - PROPOSED WATER AND SEWER RATE ADJ

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City of Santa Ana, CAI WATER RATE STUDY historical records. The City's GIS and historical records provided material type and /or size, year in service and quantity for the infrastructure assets. Black & Veatch undertook a gap analysis of the provided asset inventory data, to identify missing data. Using our experience with similar facilities, and as validated with City staff familiar with specific assets, Black & Veatch derived useful lives, R &R schedules and costs for the water assets. Asset Class Library Contents Black & Veatch used CAMPS to model R &R needs for water infrastructure asset classes. To support this modeling effort, Black & Veatch developed an asset class library consisting of asset class definitions, expected useful lives, and unit costs for each asset class to project in a methodical and consistent manner the timing of R &R of assets and estimated costs to support the reserve funding strategy analysis. Described below are Black & Veatch's assumptions in developing the Asset Class Library that forms the basis for projecting the R &R schedules and costs and contained within CAMPS. Water Infrastructure System Water system assets range from water production assets (wells, pumps, storage and treatment) to distribution system assets (such as pipe, valves, and service connections). Water infrastructure asset classes were defined by Black & Veatch and grouped into the following categories for the analysis. ® Water Production and Treatment Facilities • Reservoirs and Tanks • Wells o Metropolitan Water District (MWD) Connections o Pumps /Motors o Water Production Meters • Control Valves (Associated with water production and storage facilities) • Chemical Treatment (Chlorination Units) N Water Distribution Facilities (Pipe and Appurtenances) Table A - 1 presents the expected useful life for water infrastructure system assets below for each asset class. BLACK & VEATCH I Appendix A, Refurbishment & Replacement l rn—af- 67 65B -79