PK26_01 _ BRP _ Addendum 4.pdf

Bunten Road Park Improvement Project

Addendum #4 – Issued January 12, 2026

Notes:

1) This Addendum includes a revised Bid Form. The unit of measure for Bid Items 103 and 207 has been changed to EA (Each).

2) FOR ACCESS TO CAD FILES: Complete and sign Columbia’s Electronic File

Release Waiver (last page of addendum) and return to erinwhite@columbia-engineering.com. A link to .dwg files will be emailed to you.

Questions with Response from end of day on 12/23/2026 thru 01/09/2026:

01/09/2026

1) There are 5 Bioretention Water Quality units called out on the plans, but there is no details or information on them, so we are unsure on how to price. Please advise.

a. RESPONSE: Refer to SHEET C-7.6 (page 46 of 102) for:

• Bioretention Area with Underdrain DETAIL

• Bioretention Basin Outlet Structure DETAIL

• Outlet Control Structure with Orifice DETAIL

• Special Construction Underdrain DETAIL

• Outlet Structure TABLE

01/07/2026

1) Will the park be shut down during the period of construction? If not, please provide a phase plan for acceptable closure of portions of the park along with a duration of permitted closure.

a. RESPONSE: A full park closure is not anticipated. The park is expected to generally remain open to the public in accordance with the Bunten Road Park mailto:erinwhite@columbia-engineering.com mailto:erinwhite@columbia-engineering.com

Activity Schedule included in the RFP, which identifies seasonal and peak-use periods for park facilities, including but not limited to:

• Soccer Fields (Fields 1–4):

o Fall season: August–November o Spring season: March–May o Peak usage: Weekdays 5:30 p.m.–9:30 p.m.; Saturdays and

Sundays 9:00 a.m.–6:00 p.m.

• Softball/Baseball Fields (Fields 5–6):

o Season: August–November o Peak usage: Weekdays 5:30 p.m.–9:30 p.m.; weekends

• Tennis / Pickleball Courts:

o General play: evenings and weekends o Lessons/programming: daily, approximately 4:00 p.m.–9:00 p.m.

• Activity Building (Community Center):

o Peak usage: morning and evening activities year-round

• Playground:

o Peak usage: weekday afternoons

As stated in the RFP Instructions and discussed during the pre-bid meeting, the Contractor is responsible for developing a detailed construction schedule and phasing plan that identifies which portions of the park will be temporarily closed during each phase of construction. The proposed phasing plan shall minimize impacts to scheduled park activities, avoid peak usage periods where feasible, maintain safe public access, and be coordinated with and approved by the City prior to implementation.

Temporary closures of specific park areas will be permitted as necessary to safely complete the work; however, extended or blanket closure of the entire park is not expected.

2) Does the City of Duluth have a spoil area where the materials removed/demolished may be deposited?

a. RESPONSE: No. The City of Duluth does not have a designated spoil or disposal area available for this project. The Contractor shall be responsible for off-site disposal of all excess or unsuitable materials in accordance with applicable regulations.

3) It appears the entire parking lot and roadway has either standard curb or header curb. In areas where header curb exists are we to tie in flush with top header curb or will overlay of header curb be permitted?

a. RESPONSE: As previously clarified, header curb shall not be overlaid.

Pavement shall be milled as necessary to match existing grades, tie in flush with the top of header curb, and maintain positive drainage. Care shall be taken to ensure smooth transitions and compliance with applicable grading and drainage requirements.

12/26/2025

1) What is the thickness for overlay of roadway & parking lot? Mix type also? On overlay of roads & parking lot. Does overlay need to match lip of curb? Or pave into gutter? Edge mill to tie in?

a. RESPONSE: (same as above) The asphalt overlay shall consist of 1.5 inches (compacted thickness) of 9.5 mm Superpave Type II hot mix asphalt, placed in accordance with Section 32 12 16 Asphalt Paving and GDOT Section 400 requirements. A tack coat shall be applied prior to placement, and smooth transitions shall be provided at all tie-ins including curb lines, driveways, and adjacent pavement. Overlay limits shall be adjusted in the field as necessary to maintain positive drainage and existing curb and gutter function. Milling, if required, shall be performed as needed to receive the specified overlay thickness while maintaining drainage.

12/23/2025

1) Could you please provide the CAD file for the referenced project?

a. RESPONSE: All bidders requesting CAD files must first execute a release form prior to receiving any digital files. Upon receipt of the signed release, CAD files will be made available during the week of January 5.

b. Release form is last page of Addendum.

12/23/2025

1) What is thickness & type mix for overlay?

a. RESPONSE: The asphalt overlay shall consist of 1.5 inches (compacted thickness) of 9.5 mm Superpave Type II hot mix asphalt, placed in accordance with Section 32 12 16 Asphalt Paving and GDOT Section

400 requirements. A tack coat shall be applied prior to placement, and smooth transitions shall be provided at all tie-ins including curb lines, driveways, and adjacent pavement. Overlay limits shall be adjusted in the field as necessary to maintain positive drainage and existing curb and gutter function. Milling, if required, shall be performed as needed to receive the specified overlay thickness while maintaining drainage.