R2021-14 Resolution Authorizing a Professional Engineering Services Agreement with AECOM Technical Services, Inc. to provide design services for the Ellen and Division Inflow and Infiltration Reduction Program – Phase 2, City Project 2018-01

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Exhibit A-2 ASCMAECOM 312 938 0300 tel 303 East Wacker Drive 312 373 6800 fax Suite 1400 Chicago,IL 60601 www.aecom.com • Discuss and review known or potential existing site conditions that may affect construction bid items The site visit will include two (2) members of the AECOM team, as well as least one (1) member of the City staff. The goal will be to determine what site conditions may pose additional risk for the construction contract, especially as it relates to non-standard contract bid items that may be required for construction. Manhole locations on Oakland Avenue (Illinois Route 48) will also be documented, as this may impact the maintenance of traffic(MOT)design for this area. It assumed that the project area will include only the Ellen and Division sub-basin, which does not include the downstream area, where the Sanitary District of Decatur (SDD) owns, operates, and maintains an existing 15-inch diameter sewer(see the attached Attachment 1).The boundaries of the proposed site can generally be described as Oakland Avenue (Illinois Route 48) to the east, Grand Avenue to the south, Summit Avenue to the west,and Garfield Avenue to the north. Furthermore, it is assumed that the 1/1 reduction will be comprehensive in this area and that every City owned sewer, manhole, and lateral will be included, as much as possible, in the proposed 1/1 rehabilitation design. Deliverables • Meeting Minutes Task 2: DESIGN(50%,95%,AND 100%) AECOM will prepare bidding documents, which will include front end contract documents, technical specifications, and appendices that will include overall project maps and construction details. Detailed, individual designs for each home or block will not be provided. Rather, summary maps and figures developed in GIS will show the inflow and infiltration(1/1) reduction design. AutoCAD 2018 (or higher) will be used for developing any standard, construction details that are not covered by the City's existing standard details. Pay items and quantities will be developed based on known and estimated conditions and will cover sewer rehabilitation, lateral rehabilitation, manhole rehabilitation, restoration, backfill, landscaping, materials testing, and traffic control. The pay items may be in accordance with standard IDOT or City pay items(or other), but the final approach will be determined prior to completion of the 50% design documents. The design will incorporate the following rehabilitation methods: 1. Cured-in-place pipe(CIPP) lining for approximately 22,000 LF of mainline sewers a. Mainline sewer that may potentially be upsized in the future will need to be addressed by one of the following options: i. Do not line any sewer that may be replaced in the future due to potential upsizing. ii. Line all mainline sewers. If upsizing is required in the future, parallel sewers will be installed in lieu of replacement sewers. This will avoid the City having to replace recently lined sewers. 2. Completed sewer lateral rehabilitation'for approximately 550 homes. a. Multiple lateral lining technologies will be considered during the design. b. It is assumed that work will be performed on private property,either for accessing the existing cleanouts or constructing new cleanouts. Obtaining temporary easement 'The proposed rehabilitation will take place from the existing mainline sewer to the front of each home, where a new cleanout will be installed.If an existing,usable cleanout already exists at the front of each home, then a new cleanout will not be required. 2