Amendment No 1 to Owner-Engineer Agreement – Additional Work Required by FERC for South Bend Dam 2020 - Christopher B. Burke Engineering, LLC.

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PAUL A. HUMMEL, PE PIPER C. TITTLE, PE MICHAEL J. GUZIK, PE 9033.27 GREGORY L. HOLDEN, PE February 13, 2020 JON E. RIEMKE, PE Via Email — 2/13/20) L JEFFREY(Sent CHRISTO CHRISTOPHER J. JETER, PE ERJ.McKJE, R, DENNIS A. ZEBELL, PE Mr. Jason Durr, PE DAN G. DELGADO, PE Director, Northern Indiana JARED M.HUSS,PEAARON Christopher B. Burke Engineering, LLC. W. BLANK, PS, PE 220 West Colfax Avenue, Suite 500 BREAGAN P. EICHER, PE KEVIN J. SIEDLECKI, PE South Bend, IN 46601 CHRISTOPHER M. VANHULLE, PE MICHELLE M.G. SLACK, PS RE: Proposal for Consulting Engineering Services MAX WATKINS, PE, SE South Bend Dam — Downstream Bathymetric Survey DMITRI G. ADAMS, PE AMANDA R. BUDREAU, PE JOSEPH D. DUNBAR, PE Dear Mr. Durr: ETHAN L. ZARTMAN, PE Thank you for the opportunity to submit this proposal to provide consulting engineering services for the South Bend Dam — Downstream Bathymetric Survey Project. We appreciate your consideration of LFA and welcome the opportunity to work with Christopher B. Burke Engineering LLC (CBBEL). The following is a Project Description, Scope of Services, Schedule and Fee for the project. i` •;fir, ' "' The Federal Energy Regulatory Commission (FERC) requires that an underwater inspection and a bathymetric survey be performed every ten (10) years at the South Bend Dam. In their December 2019 triennial inspection report, FERC required an additional inspection and survey be performed due to the flood of record that occurred in February 2018 and the history of scour and erosion issues at the dam. Coordinate with American Electric lower ARl' Re a din Water Release from the Twin Branch Hydroelectric Pro/ect In the past AEP has been able to work within their FERC requirements to limit outflow from the Twin Branch project to allow for lower River flows during the underwater inspection and bathymetric survey. While this does not stop flow over the dam, the lower flow does allow for a safer inspection and survey. Coordination with AEP, the FERC and the Indiana Department of Natural Resources (IDNR) is required in order to manipulate the impoundment level upstream of the Twin Branch Dam. LFA will conduct this coordination for the Bathymetric Survey. Depending on timing, it may be advantageous to conduct the underwater dive inspection during the same time period. A♦ Z 0 4W "'I During previous inspections the riverbed downstream of the dam was surveyed to monitor the potential movement of riverbed material. After several surveys it was concluded the riverbed had stabilized and there appeared to be no threat to undermining of the Dam. Despite the most recent 10-year inspection having been performed in 2017, FERC is requiring an additional survey and inspection be performed by December 31, 2020 because of the flood of record that occurred in February of 2018. 525 WEST WASHINGTON AVENUE . SOUTH BEND, INDIANA 46601 . 574-234-3167 . 574-236-1330 (FAX)