751.24168.ABG_MillCreek-Bulletin3&4StructRepairs_Addendum1_Issued_251121.pdf

ADDENDUM NO. 1

DATE: November 21, 2025

PROJECT: Historic Mill Creek Visitor Center – Bulletins 3 & 4 Structural Repairs

DTMB FILE NO.: 751/24168.ABG

OWNER: MI DTMB/ Mackinaw Island State Park

BID DATE: Wednesday, November 26, 2025 ** THIS ADDENDUM DOES NOT CHANGE

THE BID DATE

The following shall be incorporated into the Contract Documents dated 10 NOVEMBER 2025.

GENERAL

The pre-bid meeting attendance sheet is attached.

PROJECT MANUAL

DC SPEC: Schedule of Unit Prices or Contingent Change Order Prices Reissued Section.

Unit Price: Provide a unit price for replacement of damaged 4x6 rafters at the bathroom building.

DRAWINGS

Sheet A-101 Detail 1: Repair of bowed wall at exterior wall at the main building. Wall repair is located on the North wall directly adjacent to the new mechanical pad, starting at the inside corner (intersecting with the storage room wall) and going approximately 16ft to the west. One existing truss is supported by this portion of wall. Repair shall consist of, shoring the existing truss to off-load the wall, push the bottom of the wall back into place (approximately 1.5”). Install new ½” diameter all-thread anchor rods at max 3ft o.c. (minimum 3 per board) with matching nut and washer. New holes are to be field drilled into existing concrete and positioned such that they are more than 3” away from the existing bolt holes. Provide minimum 6” embedment into concrete. If wall cannot be pushed into place, replace the wall sill plates in staggered 4ft sections with PT material. Use epoxy per general structural concrete notes. Once sill plate anchors are cured and secured, the shoring may be released.

Sheet A-112 Detail 3 & 5: Two additional truss end repairs (per detail 5/A-112) are to be added to the project. Truss ends to be added are located at grid locations e2-eC and e2.5-eC.

Sheet A-202 Detail 3: Clarification, the 4x6 diagonal roof framing member going from gridline e1 to e2 is to be included as part of the fascia replacement for the bathroom building.

QUESTIONS

1. Please confirm that this contractor is responsible for removal of ALL of the remaining roof decking at the restroom building and they are also responsible for the supply and installation of new 2x6 pressure treated T&G decking on the entire roof? Confirmed all remaining decking to be removed; species of decking in this area is contractors choice (not limited to Douglas fir).

2. There is a note on sheet A-101 that states the owner is providing the T&G decking material at the valley replacement. Please confirm this is correct and confirm if they are providing decking only for this area or if they are providing the material for the bathroom building as well? T&G Decking for repairs at Visitors Center provided by owner, decking for bathroom/pavilion building by contractor.

3. Is it possible for the engineer to provide a proposed LVL size for the replacement of valley beam at the visitor’s center? Yes. Provide a minimum 7”x11.875” LVL with properties per the General Structural Wood Notes.

4. Who is responsible for painting and/or staining of exposed timbers? Interior exposed structural timbers to be stained to match existing; Water-Based Varnish System MPI INT 6.4M: Prime Coat:

Water-based varnish matching topcoat. Intermediate Coat: Water-based varnish matching topcoat. Topcoat: Varnish, water based, clear, satin (MPI Gloss Level 4), MPI #128. Decking repairs at Visitors Center to be stained by others.

Exterior exposed timbers to be primed, one coat exterior latex wood primer; white, waterborn-emulsion, formulated for resistance to extractive bleeding, mold, and microbials.

New roof decking at bathroom/pavilion building to receive solvent-based, alkyd-type, clear semigloss varnish stabilized against UV deterioration for exterior wood surfaces.

5. Will we be required to submit engineered shoring designs for review and approval prior to installation or would this fall under means and methods for the contractor?

This will fall under the contractor’s means and methods.

6. What are the limits to what builder’s risk insurance needs to be provided per this contract? The new contractor will provide their respective Builders Risk and Liability Insurance.

7. Will they provide builders risk? Liability? & will the current GC be listed as additional named insured? The new contractor will provide their respective Builders Risk and Liability Insurance.

Ripman Construction will not be listed as additional insured as the contract will be direct with the new contractor.

8. Will they provide their own toilet, temp heat, waste removal, temp shoring, temp weather protection, they will have to provide their own temporary power? New GC to provide their own toilet, waste removal, temp shoring and temp weather protection for the areas they will be working on. Temp heat will be Ripman's responsibility. The new GC will be able to utilize the temporary power currently at the site.

9. Will they provide bonding? The new contractor will have to provide their required bonding.

10. What will be the reporting structure 4 both construction teams? Both teams will be required to attend construction meetings and provide appropriate project schedules and updates.

11. Which construction team will take project site precedence? Both contractors will be working together to coordinate their respective construction activities – this will have to be worked out between the two GCs and DTMB will provide direction if the two GCs cannot figure it out.

12. Will they provide not only a construction schedule, but a sequence of work for each bldg? Both GCs will be required to provide schedules and sequences of work activities – through coordination with each other.

13. Will they have a separate defined laydown area? The other GC will have a separate laydown area, but again the two GCs will have to work together.

14. Will they provide two building permits, one for each building? The project will be permitted as required by LARA.

15. What is game plan if:

a. Quote is above & beyond expectation? This will have to be reviewed and addressed as the situation arises.

b. Time allotted for construction is not sufficient? To be reviewed if it occurs.

c. Actual construction takes much longer than expected? To be reviewed if it occurs.

16. Is Ripman’s bulletin 3 pricing off the table, and if so can we please receive a letter stating same?

Ripman’s bulletin quote will not be accepted.

17. How does Ripman receive renumeration for expenses related to preparing bulletin 3 pricing?

There will be no reimbursement for quoting the bulletin, especially when it was deemed not feasible.

18. How about warranty? If a failure occurs once project is completed, but before the required 30 year roof warranty expires, and it is directly attributable to work performed by the bulletin 3 & 4 contractor, will there be language in both warranties clearly outlining who holds responsibility?

The roof warranty is for the roofing material and watertightness and if it is determined that there are structural issues, the structural issues will have to be addressed by the GC doing that work along with all other repairs required due to that specific faulty workmanship.

19. Has bulletin 3 & 4 been submitted to LARA for review & approval? Plans have been submitted to

LARA and is in review.

20. In review of bulletin 3 & 4, are the method(s) proposed of fastening the rafters to the valley beam detailed, & are they to current code? It is the engineer’s responsibility to properly design fastening connections and for the GC to follow those requirements.

21. Who keeps the project site accessible during inclement weather? As stated in the pre-bid, MSHP will plow the main drive, but it will be Ripman’s responsibility for snow removal around the facility as they should be onsite at all times and it is already in their contract.

End of Addendum No. 1

Bidding and Contract Document (R 11/25) Historic Mill Creek Visitor Center – Bulletins 3 & 4 Structural Repairs File No.

751/24168.ABG

Schedule of Alternates - The Bidder will complete (or deduct from the Contract) the parts of the Work designated by the Alternates that follow and accept in full payment (or allow in full credit) for those parts of the Work the following Item Bid Prices:

Alternate Item No.

Bid Quantity

Description

Unit Price

Item Bid

The Bidder further acknowledges and agrees that the separate prices bid on this “Schedule of Alternates,” where they are applicable and deemed acceptable by the Owner, will be used if incorporated into the Contract when the Owner issues the Notice of Award.

Schedule of Unit Prices or Contingent Change Order Prices - The Bidder shall use this “Schedule” to quote unit prices identified in the bid documents or propose other contingent Change Order prices. The proposed Unit Prices or contingent Change Order prices set forth in this schedule, at the sole discretion of the Owner, may, or may not be incorporated into the Contract Documents. The Owner reserves the right to negotiate Unit Prices or contingent Change Order prices set forth herein prior to their possible incorporation into the Contract Documents.

Item No. Bid Quantity

Description

Unit

Item Bid Price

Fascia Linear Foot Linear Foot of Fascia

T&G Roof Deck SQ FT SQ FT of T&G Roof Deck

4x6 In Kind Rafters Linear Foot Linear Foor of 4x6 Members