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ix. Previous collection system performance data(i.e. Sanitary Sewer <br /> Overflow, Unauthorized Combined Sewer Overflow, and Property Backup <br /> locations). <br /> b. A clear assessment of each targeted area and the reasoning behind why the area is <br /> being targeted. This assessment shall consider the locations of previous <br /> occurrences of SSOs,Unauthorized Combined Sewer Overflows, and Property <br /> Backups and shall rank the targeted areas in terms of either the area with the <br /> highest contribution of UI, the area with the least amount of conveyance capacity, <br /> or both. If another ranking methodology is used, it shall be explained in detail. <br /> c. A mapping investigation of each targeted area that considers the following: <br /> i. Stornn sewers crossing or running parallel to Separate Sanitary Sewers; <br /> ii. Sanitary Sewers constructed near rivers, streams, ditches, ponding areas, or <br /> flooding areas that may be sources of UI; <br /> iii. Sanitary Sewers constructed in unsuitable soils that may be subject to <br /> settling, resulting in open joints and/or pipe cracking; <br /> iv. The age, size, and type of the major sewers within the target area; and <br /> v. Known or potential problem areas within the target areas including SSOs, <br /> Unauthorized Combined Sewer Overflows, and Property Backups that have <br /> occurred. <br /> d. An alternatives analysis for each target area that will recommend actions that take <br /> all feasible steps to elizninate excessive UI into the Respondent's Separate <br /> Sanitary Sewer Collection System to mitigate the impact of excessive UI on SSOs <br /> and Property Backups. Respondent shall also identify solutions to any hydraulic <br /> deficiencies within both its Separate Sewer Collection System and its Combined <br /> Sanitary Sewer Collection System that are contributing to SSOs, Unauthorized <br /> Combined Sewer Overflows, and Property Backups. The alternatives analysis , <br /> shall address, but not be limited to, the following: � <br /> i. A description of each technically feasible alternative considered within the <br /> targeted areas that will eliminate Sanitary Sewer Discharges and <br /> Unauthorized Combined Sewer Discharges and prevent Property Backups <br /> from occurring. Respondent shall give specific consideration to <br /> addressing the following types of actions: <br /> 1. Improvements to the existing sewerage including repairs, <br /> rehabilitation, or replacement of sewer pipes or lift stations; <br /> 8 <br />