Amendment No 1 to OEA - Services Seitz Park Retaining Wall Proj No. 121-079 – American Structurepoint, Inc.

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5835 W. 74th Street Indianapolis, IN 46278-1757 T (317) 876-0200 www.sme-usa.com © 2022 SME P00307.22+020122 1 February 1, 2022 Mr. Thomas McNicholas American Structure point, Inc. 205 West Jefferson Blvd, Suite 404 South Bend, Indiana 46601 Via E-mail: tmcnicholas@structurepoint.com (PDF file) RE: Proposal for Geotechnical Design Services University of Notre Dame Hydroelectric Project Seitz Park Retaining Wall City of South Bend South Bend, Indiana SME Proposal No.: P00307.22 Dear Mr. McNicholas: SME is pleased to present this proposal for geotechnical design services for the subject project. The scope of services, and associated professional services fee, are contained herein. SITE CONDITIONS AND PROJECT DESCRIPTION The project site is located at Seitz Park in South Bend, Indiana. The project site is also part of the University of Notre Dame hydroelectric project; FERC project number P-7569. The project includes replacing a portion of an existing concrete retaining wall that is experiencing some significant deterioration. The concrete wall stem (above the river water level) consists of cast in place concrete, however, we understand the foundation supporting the wall stem consists of cobbles and boulders. The wall is located along the west side of the East Race, just west of the future inlet for the hydroelectric project. The wall connects to the existing headgate of the East Race, and to a new concrete cantilever retaining wall associated with the hydroelectric project. In an attempt to avoid constructing a cofferdam and dewatering, we understand the project team selected a sheet pile system for this retaining wall repair. The intent is to remove the concrete wall stem and install the sheet piles through the underlying cobbles and boulders and into the natural sand and clay subgrade. The length of wall to be repaired is about 60 feet. The wall will retain up to 13 feet of earthen subgrade, along with a live load for pedestrian traffic and occasional (relatively lightly loaded) maintenance vehicles. A statue will also be located about 5 to 10 feet away from the wall repair. We understand the project team has selected to reuse some of the 35-foot long NZ19 sheet piles that were used for the hydroelectric project. These sheet piles have served their purpose for the hydroelectric project and will be removed in the near future. DocuSign Envelope ID: 7577D775-B779-4E56-9B57-400C7C84145CDocuSign Envelope ID: D4FF8BCD-1E44-413E-9A62-99BE724EBEE4