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City of Santa Ana, CA I SEWER RATE STUDY <br />SEWER COLLECTION SYSTEM CIP ANALYSIS <br />Sewer System Statistics <br />For the purpose of this condition assessment / rate study, only the sewer mains were evaluated. Sewer <br />laterals, manholes, lift stations, etc. were not evaluated. However, their costs were included in future <br />replacement forecasting as part of the combined pipe replacement cost as applicable. Source data was <br />primarily provided from Santa Ana's GIS system. Additional data was provided in spreadsheets, text files, <br />and /or from communications with City staff. <br />According to the City's GIS database, the sewer collection system contains about 446 miles of sewer <br />mains. This total includes all pipeline types including pipes owned by Orange County Sanitation District <br />(OCSD), or jointly managed under a cooperative agreement with Garden Grove (COGG) or Orange <br />County Sanitation District (COOP). These pipeline assets were included in the initial historic assessment <br />so as to gain the most complete past evaluation of pipe conditions. However, for future replacement <br />forecasting, the abandoned and private lines were excluded from the analysis based on the assumption <br />that the City would not be replacing these assets. <br />Pipe Material <br />By far, the most predominant pipe material in the sewer collection system is Vitrified Clay Pipe; making <br />up nearly 90 percent of the system. Material percentages (by length) are indicated in Figure B 2. <br />Figure 8- 2: Sewer Pipe Material Percentages (by Length) <br />■ VCP (Vitrified Clay Pipe) <br />■ Lined (a variety of linings) <br />® PCC(Precast Concrete) <br />Y PVC (Polyvinyl Chloride) <br />■ Other (ABS, DI, HDPE, <br />UNK) <br />Figure B 3 provides a map of sewer mains color coded by pipe material. Figure B 4 provides a similar <br />map showing sewer mains that have been lined. <br />BLACK & VEATCH I Appendix B: Sewer CIP Prioritization Process <br />65B -228 <br />