R2022-113 Resolution to Authorize Professional Engineering Services Agreement with Burns & McDonnell Engineering Company, Inc. to Provide Preliminary Engineering Services for the Broadway and Jasper Street Sewer Rehabilitation Project

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EXHIBIT A BURNS NMC-DONNELL. July 11, 2022 Paul Caswell,PE City Engineer City of Decatur Public Works Department #1 Gary K. Anderson Plaza—3'Floor Decatur,IL 62523 RE: Proposal for Engineering Services Sewer Rehabilitation—Broadway and Jasper Dear Mr. Caswell: Burns&McDonnell Engineering Co.,Inc. (BMcD)has prepared a Scope of Services (Scope)per your request for engineering services regarding the rehabilitation and improvements of two(2) large diameter, combined sewers(Broadway and Jasper Street). The Scope is presented below. BACKGROUND The City of Decatur(City)has two large diameter combined sewers that require study and assessment. The Broadway sewer consists of two segments: South Broadway and Upper Broadway. The Upper Broadway sewer is egg-shaped brick construction varying in size from 28-inch wide by 42-inch high to 48-inch wide by 72-inch high, across multiple segments,with multiple manhole access points. The South Broadway sewer is brick construction varying in size from 28-inch by 48-inch oval to an 84-inch circular shape with multiple segments and manhole access points. The target study length for the Broadway sewer is approximately 10,500 feet long. The Jasper Street sewer is brick construction varying from 36-inch by 54-inch egg-shaped on the upper end to a 72-inch circular shape on the lower portion. In parallel,the Jasper Street Relief sewer is reinforced concrete pipe construction varying in size from 36-inch on the North end to 72-inch on the downstream end,where it connects to the Jasper Street sewer. Both sewers have multiple segments and manhole access points. The target study length for the Jasper Street sewer is approximately 8,200 feet long. The target study length for the Jasper Street Relief sewer is approximately 3,900 feet long. Both Broadway sewers and the Jasper Street sewer were constructed in the 1890s as combined sewers. The Jasper Street Relief sewer was constructed in the 1940s as a combined relief sewer. The base flow volume of these sewers has been reduced over the years;however, all the sewers have direct wet weather inflow from catch basins and infiltration. The total sewer study length is approximately 22,600 feet. These sewers serve a large industrial client, small industries,businesses, and local residences. The sewage has an elevated temperature as result of industrial influent. Additionally, as discussed in a memo from another City consultant on July 12,2021, a portion of this sewer is located in a critical downtown corridor and has odor issues that requires further analysis and evaluation. 200 W.Adams Street\Suite 2700\Chicago, IL 60606 A-1 0 630-724-3200\F 312-223-0920\burnsmcd.com