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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. Storm 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 I/I; <br /> iii. Sanitary Sewers consttucted 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 altematives analysis for each target area that will recommend actions that take <br /> all feasible stegs to eliminate 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 aiternative considered within the <br />, targeted areas that will eliminate Sanitary Sewer Dischazges 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 />