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City of Santa Ana, CA I SEWER RATE STUDY <br />assets use historical data captured by City staff from various different historical records. The City's GIS <br />and historical records provided material type and /or size, year in service and quantity for the <br />infrastructure assets. <br />Black & Veatch undertook a gap analysis of the provided asset inventory data, to identify missing data. <br />Using our experience with similar facilities, and as validated with City staff familiar with specific assets, <br />Black & Veatch derived useful lives, R &R schedules and costs for the water and sewer assets. <br />Asset Class Library Contents <br />Black & Veatch used CAMPS to model R &R needs for sewer infrastructure asset classes. To support this <br />modeling effort, Black & Veatch developed an asset class library consisting of asset class definitions, <br />expected useful lives, and unit costs for each asset class to project in a methodical and consistent <br />manner the timing of R &R of assets and estimated costs to support the reserve funding strategy <br />analysis. <br />Described below are Black & Veatch's assumptions in developing the Asset Class Library that forms the <br />basis for projecting the R &R schedules and costs and contained within CAMPS. <br />Sewer Infrastructure System <br />Sewer system assets consist of collections and conveyance assets. The sewer infrastructure asset classes <br />were defined by Black & Veatch and grouped into the following categories, as described further below. <br />6 Sewer Gravity Pipe <br />" Sewer Lift Stations, Pumping and Related Equipment <br />Table A 1 presents the expected useful life for sewer infrastructure system assets below for each asset <br />class. <br />Table A -1: Sewer System Expected Useful Lives <br />BLACK & VEATCH I Appendix A: Refurbishment & Replacement Program <br />65B -218 <br />Lift Station Concrete Sump and Miscellaneous Items (non - pumping <br />LIFT <br />equipment) <br />75 <br />PUMP—WW <br />Pump and Motor (non - submersible) for Wastewater <br />10 <br />PUMPS—WW <br />Submersible Pump for Wastewater <br />10 <br />SEWM ABS <br />Sewer Mains made of ABS pipe <br />40 <br />SEWM. DI <br />Sewer Mains made of Ductile Iron pipe <br />75 <br />SEWM FELT <br />Sewer Mains made of Felt -lined pipe <br />75 <br />SEWM FFPVCL <br />Sewer Mains made of FFPVCL pipe <br />75 <br />SEWM_FIBER <br />Sewer Mains made of Fiber pipe <br />75 <br />BLACK & VEATCH I Appendix A: Refurbishment & Replacement Program <br />65B -218 <br />