Addendum 1 - 26149.pdf

DTMB-0414 RFP (Rev 2/22)

DEPARTMENT OF TECHNOLOGY, MANAGEMENT AND BUDGET

State Facilities Administration Design and Construction Division

REQUEST FOR PROPOSAL

ADDENDUM NO. 1

This form identifies an Addendum to a Request for Proposal for Professional Services, and incorporates interpretations or clarifications, modifications, and other information into the Request for Proposals.

Addenda will be numbered by the Project Director and distributed through SIGMA Vendor VSS as an attachment.

TO:

ALL PROPOSERS

DATE ISSUED

3/25/2026

PROJECT NAME

Shiawassee River State Game Area - St. Charles, MI Shiawassee Dam No. 1819 - EGLE Safety Repairs

FILE NUMBER

751/26149.CTS

PROJECT DIRECTOR

Chris Schanbeck

PROPOSAL DUE DATE:

April 9, 2026

ADDENDUM ITEMS:

1. The proposal due date is extended 1-week to April 9, 2026 at 2:00pm.

2. The pre-proposal sign-in sheet is attached.

3. As discussed, the expected extent of the initial work will be for phases 100 and 300 with the remaining phases to be completed at a later date under a separate contract or modification. Where practical, the expectation would be to include sufficient direction and specifications in the study and or schematic documents to allow the facility to permit and complete earthwork related repairs in the near term. Review and updating the dam O&M plan shall also be included as part of the phase 300 services. However, for budgetary purposes it is requested to include estimated fees for phases 500, 600 and 700 assuming the main final design scope will include replacement of outlets #2 & #3 conduits along with some improvements to the Principal, Auxiliary and Emergency spillway.

4. Priority scope items are those noted in the EGLE inspection report as requiring action of an Engineer to address. The following are some additional specific items discussed that shall be incorporated:

• Structural review of the bridges over the Principal and Auxiliary spillways.

• Emergency Spillway survey and evaluation for potential grading and operational improvements.

• Embankment Steep Slope issues may be a concern in multiple locations. It is expected that the PSC will determine a reasonable approach to address including any coordination with EGLE dam safety. Any follow-up extensive identification, surveying and correction measures should be included under phase 500 services.

5. As discussed, it’s assumed that the embankments were constructed using local material from nearby ditch/swale excavations. Attached is the 2013 SME geotechnical report for the Auxiliary Spillway replacement for reference. The recommended extent of geotechnical investigation deemed necessary may be phased with additional borings done after phase 300.

6. A LARA permit is not anticipated for any of the improvements to the dam.

APPROVED BY: Chris Schanbeck, Project Director