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ACOExhibit A-2 <br /> AECOM 312 938 0300 tel <br /> 303 East Wacker Drive 312 373 6800 fax <br /> Suite 1400 <br /> Chicago,IL 60601 <br /> www.aecom.com <br /> • Discuss and review known or potential existing site conditions that may affect the proposed <br /> sewer separation <br /> The site visit will include two (2) members of the AECOM team, as well as least one (1) member of <br /> the City staff. The goal will be to confirm the location of existing catch basins and inlets, confirm <br /> commercial, industrial, and institutional private storm sewer connections. <br /> Deliverables <br /> • Meeting Minutes <br /> Task 2: EVALUATION OF EXISTING DRAINAGE SYSTEM <br /> AECOM will review and evaluate existing drainage patterns within Basins 5/6 (see Attachment 1). <br /> Existing GIS contours and elevation data will be utilized for this analysis, and no topographic survey <br /> will be performed. Existing City GIS and CAD data will be used to determine the existing locations of <br /> existing catch basins, inlets, and manholes. <br /> Additionally, the theoretical capacity of the existing IDOT drainage system and existing flows will be <br /> estimated and calculated utilizing a �ydraulic and hydrologic model at up to three (3) connection <br /> points for the proposed separate sewe system. AECOM will also review the City's current agreement <br /> with [DOT to evaluate who owns the existing drainage system in Illinois Route 48 and the 60-inch <br /> storm sewer to Stevens Creek. <br /> The work performed in this task will be used as the basis for performing the alternatives analysis for <br /> the proposed separate sewer system that will be completed in Task 4. <br /> Deliverables: <br /> • Exhibits showing the flow paths of the existing drainage and existing manholes, catch basins, <br /> and inlets <br /> TASK 3: CCN REVIEW AND MANHOLE, INLET AND CATCH BASIN INSPECTIONS <br /> While not all of the sewers in Basins 5/6 are required to be televised, some televising may be needed <br /> to confirm sewer connectivity and the existing drainage system patterns. It is assumed that the City's <br /> sewer televising subconsultant (TeleScan, Inc.) will perform any televising required for the study <br /> under their separate contract with the City, and AECOM will review the televising video to perform the <br /> connectivity evaluation (an allowance of 16 hours for CCTV review has been included in our fee). <br /> Additionally, included in this task is a maximum of two (2) days of site visits that will include opening <br /> manholes, inlets, and catch basins, as well as taking measure downs to estimate existing sewer <br /> invert elevations. It is assumed that at least one (1) City staff person will be available to assist in the <br /> field verification process for a Y day. It is also assumed that the City will assist with coordinating and <br /> obtaining permission from any commercial/industrial/institutional properties to gain access for <br /> performing the inspections. <br /> While the primary intent of this work is to assist in verifying existing conditions and flow patterns, <br /> AECOM will perform condition assessment and structure inspection of any drainage manholes, catch <br /> basin, and inlets that are opened. <br /> Structure inspections consist of physically inspecting sewer manholes, inlets, and catch basins to <br /> provide documentation of structural condition. AECOM will verify locations, pipe sizes, material, <br /> orientation, invert elevations, and structural conditions. AECOM's standard manhole inspection form <br /> will be reviewed and modified to comply with the City's inspection requirements. Major defects will be <br /> 2 <br />