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88 <br />SEWER RATE STUDY I City of Santa Ana, CA <br />Quick Maintenance Rating (QMR) Analysis <br />Like the QSR ratings described previously, the City's QMR values were also assigned to individual sewer <br />pipe segments during the evaluation of CCTV pipeline inspections. These ratings address the operational <br />and maintenance related defects observed within the pipe segments. They also use the PACP four - <br />character score expressing the number of occurrences of the two highest severity grades. Figure B 17 <br />shows the percent of pipe lengths having each QMR ranking. Figure B 18 provides a map of sewer mains <br />color coded by QMR Grades. <br />Figure B -17: QMR Ratings by Percent of Sewer System Length <br />Although this QMR information is very useful to the City, it was not included in this pipeline condition <br />and replacement prioritization assessment. QMR scores are impacted more by operational and local <br />FOG (fats, oils and grease) issues rather than installation materials, structural conditions or probability <br />of failure considerations. However, it should be noted that some common maintenance issues (e.g. sags) <br />might be corrected with structural repairs. The City may wish to address these situations further. <br />[INTENTIONALLY LEFT BLANK] <br />65B -247 <br />NOVEMBER 2024 <br />