R2021-114 Resolution Authorizing a Professional Engineering Services Agreement with AECOM Technical Services, Inc. to Provide Preliminary Design Services for the Oakland and Grand Area Sewer Separation Study, City Project 2021-01

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ACOExhibit A-1 AECOM 312 938 0300 tel 303 East Wacker Drive 312 373 6800 fax Suite 1400 Chicago,IL 60601 www.aecom.com May 17, 2021 Paul Caswell, PE City Engineer City of Decatur Public Works Department #1 Gary K Anderson Plaza-3rd Floor Decatur, Illinois 62523 Regarding: Basin 5 and 6 Sewer Separation Study Dear Mr. Caswell: AECOM Technical Services, Inc. (AECOM) is providing this scope of work(Scope)for the above- referenced project. This Scope encompasses AECOM's engineering services for the subject project. Note that a detailed breakdown of task costs and a schedule is included in this Scope. Background The City is currently under Administrative Consent Order (ACO) by the United States Environmental Protection Agency (USEPA). The ACO requires a reduction in basement backups within the City's combined and sanitary sewer system, as well as the elimination of all unauthorized Combined Sewer Overflows (CSOs) and Sanitary Sewer Overflows (SSOs). In order to demonstrate compliance with the ACO, the City was required to submit a Sewer Collection System Alternatives Analysis (SCSAA). In partnership with AECOM, the SCSAA (and subsequent revisions)were submitted on April 12, 2016, November 4, 2016, and November 30, 2017. As a part of this work, Basins 5 and 6 were identified as a critical area that required substantial improvements in order to reduce basement backups and meet the requirements of the USEPA's ACO. The SCSAA recommended partial sewer separation and construction of relief sewers to reduce backups. However, the Sanitary District of Decatur will not approve the relief sewers, since they will cause a flow increase into their system. Therefore, the City would like to pursue, as much as possible, complete sewer separation within Basin 5/6. Additional evaluation and study are required in order to provide the basis of design, which needs to be performed prior to preliminary and final design of the project. SCOPE OF WORK Our scope of work will be as follows: Task 1: SITE VISIT AND KICK-OFF MEETING The first order of work on this project will be to schedule and conduct a kick-off meeting with the City of Decatur, as well as to perform a site visit with City staff. The purpose of the meeting is to: • Establish lines of communication • Discuss and confirm overall project approach • Review scope and identify any potential problems • Review existing drainage conditions within Basins 5/6, as well as downstream areas that will be impacted by the proposed sewer separation 1