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2023 Maintenance Dredging Project: Acceptance of Public Improvement Construction ContractCity of Dubuque City Council Meeting Consent Items # 09. Copyrighted April 1, 2024 ITEM TITLE: 2023 Maintenance Dredging Project: Acceptance of Public Improvement Construction Contract - Project Number: 5546000001-304-67990 Harbor Area Dredging SUMMARY: City Manager recommending City Council adopt the attached resolution to accept the Public Improvement Construction Contract and to authorize the payment of the contract amount of $546,823.00 to Newt Marine Service for 2023 Maintenance Dredging Project. RESOLUTION Accepting the 2023 Maintenance Dredging Project and Authorizing Final Payment to the Contractor SUGGESTED Suggested Disposition: Receive and File; Adopt Resolution(s) DISPOSITION: ATTACHMENTS: Description Type MVM Memo City Manager Memo Staff Memo Staff Memo Resolution Resolutions Engineer's Certificate of Completion Supporting Documentation THE CITY DUOF B TEE Masterpiece on the Mississippi TO: The Honorable Mayor and City Council Members FROM: Michael C. Van Milligen, City Manager SUBJECT: 2023 Maintenance Dredging Project Acceptance of Public Improvement Construction Contract Project Number: 5546000001-304-67990 Harbor Area Dredging DATE: March 26, 2024 Dubuque All -America City IN 2007.2012.2013 2017*2019 Assistant City Engineer Robert Schiesl is recommending City Council adopt the attached resolution to accept the Public Improvement Construction Contract and to authorize the payment of the contract amount of $546,823.00 to Newt Marine Service for 2023 Maintenance Dredging Project. I concur with the recommendation and respectfully request Mayor and City Council approval. v Micliael C. Van Milligen MCVM:sv Attachment CC' Crenna Brumwell, City Attorney Cori Burbach, Assistant City Manager Gus Psihoyos, City Engineer Robert Schiesl, Assistant City Engineer Rick Dickinson, Greater Dubuque Development Corporation President & CEO THE CITY OF DUB E Masterpiece on the Mississippi TO: Michael C. Van Milligen, City Manager Gus Psihoyos, City Engineer FROM: Robert Schiesl, Assistant City Engineer DATE: March 26, 2024 RE: 2023 Maintenance Dredging Project Acceptance of Public Improvement Construction Contract Project Number: 5546000001-304-67990 Harbor Area Dredging INTRODUCTION Dubuque AII•Aseriea City 2007.2012.2013 2017*2019 The enclosed resolution provides for the acceptance of the Public Improvement Construction Contract for the 2023 Maintenance Dredging Project. BACKGROUND The City has an annual recurring Harbor Area Dredging Capital Improvement Program (CIP) budget which provides for maintenance dredging at multiple riverfront locations to maintain adequate harbor and channel depths for recreational and transient boat navigation. This funding allows for annual riverfront maintenance dredging as required at Schmitt Island and AY McDonald Park public boat ramp launch locations; River's Edge Plaza to accommodate excursion boat mooring; Ice Harbor gates; and Port of Dubuque Marina. The City also has a contractual obligation to maintain city -owned and leased property under current lease terms to perform maintenance dredging at Dubuque Marina and at American Marine — Dubuque Yacht Basin to maintain adequate harbor depth for recreational and transient boat navigational access. For the Dubuque Marina Lease dated October 29, 1956, the City is only responsible for performing maintenance dredging of Pleasure Boat Harbor to a usable depth for such purposes as are permitted by the Lease. Figure 1 shows the Dubuque Marina site and the location of Pleasure Boat Harbor. For the Dubuque Yacht Basin Lease dated February 5, 1974, the City is only responsible for performing maintenance dredging of Schmitt Harbor to a usable depth for such purposes as are permitted by the Lease. Figure 2 shows the Dubuque Yacht Basin site and the location of Schmitt Harbor. The FY2023 budget includes funding to assist with dredging both Dubuque Marina and American Marine - Dubuque Yacht Basin locations. FIGURE 2 In May 2023, while river elevations were still high from the spring flood event, the City retained the services of Mohn Surveying to perform river bottom bathometric surveys along the entire riverfront. Based on the survey data, staff were able to model river and harbor bottom elevations to identify shallow water way locations at various river stages and evaluate potential dredging needs. Based on the river bottom contour elevations, a silted area at the entrance to Pleasure Boat Harbor at Dubuque Marina needed to be dredged per the terms of the Lease. The remainder of Pleasure Boat Harbor has adequate depth. Schmitt Harbor at Dubuque Yacht Basin has adequate depth and does not require dredging to be performed per the terms of each respective Lease. City staff met with representatives from both Dubuque Marina and American Marine to review the bathometric survey contour maps, evaluate maintenance dredging needs, and prioritize maintenance dredging locations based on current operational challenges for safe harbor access for recreational and transient boat navigational access. Dubuque Marina identified the location shown if Figure 3 as their #1 priority to be dredged as part of the 2023 Maintenance Dredging Project. A majority of the requested dredge area is outside the Pleasure Boat Harbor location referenced per their Lease. Although the requested dredge area extends beyond the City's obligation to maintain, staff believes it is in the publics best interests to perform maintenance dredging to create a safe open water way channel for navigating vessels from the Peosta Channel and Mississippi River to and from the marina harbor. American Marine - Dubuque Yacht Basin identified the location shown if Figure 4 as their #1 priority to be dredged as part of the 2023 Maintenance Dredging Project. The requested dredge area is outside the Schmitt Harbor location referenced per their Lease. Although the requested dredge area is outside the City's obligation to maintain, staff believes it is in the publics best interests to perform maintenance dredging to create a safe open waterway for navigating vessels from the Peosta Channel to and from the marina harbor and transient docks. DISCUSSION With the completion of the 2023 Maintenance Dredging Project, American Marine — Dubuque Yacht Basin and Dubuque Marina now have adequate depth and improved open waterway access for recreational and transient boat navigational access at their highest priority areas. By dredging the additional areas outside the City's obligation to maintain and creating the open waterways from the Peosta Channel to the marina harbors, this created improved water flow and water circulation which reduces the potential for future sediment siltation within the completed dredge locations. The dredged open waterways will be more sustainable long-term and will maximize the return on the investment of City and private funding with a long-term solution in providing safe harbor access. The 2023 Maintenance Dredging Project was completed by Newt Marine Service of Dubuque Iowa in the final contract amount of $546,823.00 which is a 10.7% increase from the original contract amount of $493,840.00. The added costs incurred were a result of payment for over depth dredging. In accordance with the contract documents to cover inaccuracies of the dredging process, material removed below the design dredge 3 elevation to a depth of not more than 6 inches is measured and paid for at the contract unit price. LEGEND At 7.00' River Stage Above Water 0' - i' Deep © i' - 2' Deep 2' • 3' Deep 3'- 4' Deep 4' - 5' Deep AY MCDONALD PARK I FALL 2023 A DREDGING AREA (MAINTENANCE fill DREDGE) FIGURE 3 — Dubuque Marina Proposed Dredge Area 12 of LEGEND f At 7.00' River Stage �- Above Water Y 0' - V Deep V - 2' Deep 2' . 3' Deep 3' - 4' Deep I 4'- 5' Deep a k � n FALL 2023� '+ DREDGING AREA (MAINTENANCE DREDGE)fi It FIGURE 4 — Dubuque Yacht Basin Proposed Dredge Area G� RECOMMENDATION I recommend that the City Council accept the Public Improvements and authorize the payment of $546,823.00 to Newt Marine Service, for the 2023 Maintenance Dredging Project. BUDGETIMPACT The project cost for the 2023 Maintenance Dredging Project is summarized in the following table: Description Cost Estimate Award Final Cost Dredge Construction - Dubuque $ 200,000.00 $ 202,910.00 $ 227,241.00 Marina Dredge Construction - American 300,000.00 290,930.00 319,582.00 Marine Yacht Basin Dredging Cost $ 500,000.00 $ 493,840.00 $ 546,823.00 Contingency 25,000.00 25,000.00 0.00 Engineering Design and 15,000.00 15,000.00 16,569.13 Administration Total Dredging Cost $ 540,000.00 $ 533,840.00 $ 563,392.13 Estimate The proposed project funding is summarized as follows: Project Number Fund Description Fund Amount 5546000001-304-67990 Harbor Area Dredging $ 463,392.13 Private Participation - American Marine 100,000.00 Total Project Funding $ 563,392.13 American Marine provided $100,000 towards dredging at the Yacht Basin as part of the 2023 Maintenance Dredging Project. REQUESTED ACTION The City Council is requested to adopt the attached resolution to accept the Public Improvement Construction Contract and to authorize the payment of the contract amount of $546,823.00 to Newt Marine Service for 2023 Maintenance Dredging Project. cc: Jenny Larson, Chief Financial Officer Nathan Steffen, Civil Engineer Dubuque Marina American Marine FAPROJECTS\DREDGING PROJECTS\2023 Maintenance Dredge\Council & Staff Documents\Acceptance X Prepared by Robert Schiesl City of Dubuque Engineering 50 W. 1V St. Dubuque, IA 52001 {563)589-4270 Return to Adrienne N. Breitfelder City Clerk City of Dubuque, 50 W. 13" 5t. Dubuque, IA 52001 (563)589-4100 RESOLUTION NO. 70-24 ACCEPTING THE 2023 MAINTENANCE DREDGING PROJECT AND AUTHORIZING FINAL PAYMENT TO THE CONTRACTOR WHEREAS, the public improvement contract for the 2023 Maintenance Dredging Project, (the Project) has been completed by the Contractor, Newt Marine Service of Dubuque Iowa (Contractor), the City Engineer has examined the work and recommends that the Project be accepted; and WHEREAS, the final contract amount for the Project is $546,823.00; and WHEREAS, the Contractor has previously been paid $519,581.85, leaving a credit refund balance of $27,341,15; and WHEREAS, the City Council finds that the recommendation of the City Engineer should be accepted. NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF DUBUQUE, IOWA: Section 1. The recommendation of the City Engineer is approved, and the Project is hereby accepted. Section 2. The Finance Director is hereby directed to pay the Contractor for the balance of the retainage of $27,341.15 as provided in Iowa Code chapter 573, and to pay such retainage in accordance with the provisions of Iowa Code chapter 573 or Iowa Code chapter 26.13. Passed, approved and adopted this 1st day of Apri 1 2024. Attest: Adrienne N. Breitfelder, City Clerk Brad M. Kvaagh, Mayor Prepared by Robert Schiesl City of Dubuque Engineering 50 W. 13`h St. Dubuque, IA 52001 (563)589-4270 Return to Adrienne N. Breitfelder City Clerk City of Dubuque, 50 W. 131" St. Dubuque, IA 52001 (563)589-4100 CITY ENGINEER'S CERTIFICATE OF FINAL COMPLETION OF THE 2023 MAINTENANCE DREDGING PROJECT The undersigned City Engineer of the City of Dubuque, Iowa, hereby certifies that he has inspected the 2023 Maintenance Dredging Project has been performed in compliance with the terms of the Public Improvement Contract, and that the total project cost of the completed work is $563,392.13. Dated this 25th day of March 2024. Gus Psihoyos, City Engineer Filed in the office of the City Clerk on the 26th day of March 2024. NueIrlize ;141, 91 �� �' - Adrienne N. Breitfelder, City Clerk