Focus Area: Infrastructure (Engineering)
Staff Contact: Mary Jaeger / Nate Baldwin
Subject: Supplemental Agreement No. 1 with Olsson, Inc. for the design of the Cedar Lake Dam Restoration Project, PN 2-C-021-23.
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TITLE:
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Consideration of Supplemental Agreement No. 1 with Olsson, Inc. for design of the Cedar Lake Dam Restoration Project, PN 2-C-021-23.
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Summary:
State regulations for high hazard dams require regular dam inspections and maintenance for both spillways and dams. The Cedar Lake Dam is classified as a high hazard dam and falls under State Regulation.
To comply with State requirements, the spillway and dam of Cedar Lake must be improved. This project will remove and replace the existing spillway, and the dam embankment will be raised a minimum of three (3’) feet to meet current State requirements.
On March 7, 2023, Council approved a Professional Services Agreement with Olsson, Inc. for design of this project. This Supplemental Agreement No. 1 will provide additional engineering services including bathymetric survey and sediment sample collection. This additional data will be used to better identify design options and construction costs in preparation of the dam improvements. This data will also help determine possible water quality improvements and dredging options that may occur with construction of the dam improvements. This data can be used for the City to be better prepared to apply for additional Johnson County Stormwater Management Advisory Council (SMAC) funds for potential water quality improvements to Cedar Lake.
The total fee for the additional services provided under this Supplemental Agreement is $53,620, raising the total fee for all services provided under the Agreement from $830,380 to $884,000.
This project is currently under design and tentatively schedule to begin construction in early 2025.
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Financial Impact:
Funding for the Cedar Lake Dam Restoration Project, as approved in the 2024-2028 Capital Improvement Plan, includes:
Federal HUD $ 750,000
Revenue Bonds $ 2,144,140
Johnson County SMAC $ 1,675,360
Stormwater Fund $ 730,500
Total $ 5,300,000
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Action Needed:
Approval of Supplemental Agreement No. 1 with Olsson, Inc. for design of the Cedar Lake Dam Restoration Project, PN 2-C-021-23.
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Attachment(s):
A. Project Location Map
B. Project Fact Sheet
C. Supplemental Agreement No. 1