20-REQ-0002500 Southwest Water Treatment Flocculation Improvements Addendum No. 2 080425.pdf

GLWA Procurement

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Addendum

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Addendum No. 2 Date: 8/4/2025 Contract No./Title: 0002500 Southwest Water Treatment Plant – Flocculation Improvements

Addendum Page 1 of 9

This Addendum for the above-named solicitation, shall be taken into consideration by the Vendor preparing its response to this solicitation. The Vendor shall acknowledge and certify receipt of this Addendum on the solicitation’s “Administrative Information” document. Capitalized terms used in this Addendum, if not otherwise defined herein, shall have the meaning ascribed in the Contract/Agreement.

1. CHANGES TO THE SOLICITATION

Changes are itemized below.

a) ADDED reference document Attachment No. 14 REQ-0002500 SWWTP Walking Beam Flocculator OM.pdf

b) Due Date has been modified as follows:

Due Date Due Date/Time: Monday, August 18, 2025, 12:00 PM EST

2. CHANGES TO ATTACHMENT NO. 1 - GLWA Engineering Design Services Contract

REPLACE: Exhibit A, The Services, General Requirements, Item No. 1 as follows:

1. Consultant shall ensure to the maximum extent possible, barring unforeseen circumstances which should be promptly reported to GLWA, that the design includes all necessary improvements to obtain a fully functional and maintainable flocculator system for an estimated construction cost of approximately $23M (escalated for the construction phase occurring 2028 through 2031).

REPLACE: Project Milestones table in Attachment No. 1 REQ-0002500 GLWA Engineering Design Services Contract.pdf as follows:

Project Phase / Milestone Task Duration/Milestone Date Notice to Proceed (NTP) TBD by procurement and engineering Preliminary Design Phase 120 days Final Design Phase 270 days Construction Bid and Award Phase 270 days Construction Phase 850 days Project Closeout Phase 90 days

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Addendum Page 2 of 9

RESPONSES TO QUESTIONS

Question 1

Can a better resolution, clearer set of drawings for the 1997 flocculator improvements project for Southwest WTP be provided?

Response:

GLWA has provided the best scanned references readily available. Any available hard copies will be accessible to the successful proposer to finalize the design.

Question 2

What is GLWA's desired rating for the flocculation/sedimentation process by basin will be at the conclusion of this project?

Response:

See response to Question 3.

Question 3

In the pre-proposal meeting PowerPoint presentation, it was stated that EGLE has an approved capacity rating in the sanitary survey for the Southwest WTP. Please state EGLE's approved rating for the flocculation/sedimentation process by basin and any justification EGLE has provided to GLWA for that rating.

Response:

The Southwest Water Treatment Plant is currently rated for 156 MGD. The reduced capacity was caused by three major factors. The 2015 Water Master Plan reduced the required plant capacity to 180 MGD and allowed for removal of one flocculator and sedimentation train. The capacity was derated further in the 2015 Sanitary Survey to 160 MGD based on 40 filters operating at 2.55 gpm/sqft. The capacity was derated to 156 MGD in the 2022 Sanitary Survey based on 39 filters in-service.

The 2012 Sanitary Survey noted that the flow through velocity is 3.44 ft/min at 240 MGD with a 30-minute detention time, which deviates from 0.5 to 1.5 ft/min with a detention time of at least 30 minutes per “Recommended Standards for Water Works”. It was further noted that the deviation did not appear to be affecting water quality under current operations and such deviations should be considered when designing future modification to pretreatment. The Consultant should coordinate with GLWA and EGLE to ensure that any deviations with the revised design are acceptable.

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Addendum Page 3 of 9

The Consultant shall consider plant operation at the rated 156 MGD capacity with 3 flocculation basins in service. Additional analyses should consider other scenarios (such as having two basins in service with one in standby) and scenarios based on actual flowrates during operation.

Question 4

The project schedule in the scope of work states that the preliminary design phase and the final design phase both start from the notice to proceed. Please clarify if the schedule is correct as presented, or the 270 days for final design phase follows in its entirety the preliminary design phase.

Response:

See Item 2. CHANGES TO ATTACHMENT NO. 1 - GLWA Engineering Design Services Contract.

Question 5 approved capacity rating in the sanitary survey for the Southwest WTP. Please state EGLE's approved rating for the flocculation/sedimentation process by basin and any justification EGLE has provided to GLWA for that rating.

Question 6 approved capacity rating in the sanitary survey for the Southwest WTP. Please state EGLE's approved rating for the flocculation/sedimentation process by basin and any justification EGLE has provided to GLWA for that rating.

See response to Question 3

Question 7

Regarding Item #10 in the General Services Section of EXHIBIT A: PROJECT DETAILS AND SCOPE OF SERVICES which reads “New electrical service and wiring. Evaluation

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Addendum Page 4 of 9 existing conduit for reuse.“ Please confirm that this statement is in reference to the Electrical Building for the Flocculators and is NOT in reference to the electrical service to the entire GLWA facility.

Response:

It is confirmed that this statement is for the electrical building that serve the flocculators. The Consultant shall evaluate and determine the condition of the MCC and associated conduits for reuse. This excludes small control switches and emergency shutdowns located inside the flocculator building used to control the old flocculators. The control switches and emergency shutdowns should be demolished as part of the project scope. Refer to Attachment 2 REQ-0002500 Photos (1).pdf.

Question 8

Is there a prioritized list of components GLWA prefers to reuse to control costs (e.g., MCCs, conduits, etc.)?

Response:

There is not a prioritized list of components GLWA prefers for reuse. It would be the responsibility of the Consultant to assess existing materials for potential reuse with the design.

Question 9

What version of the ovation SCADA platform is currently implemented?

Southwest Water Treatment Plant is on Ovation version 3.8.

Question 10

Does GLWA require provisions for permanent lifting devices (e.g., monorails, hoist), or is portable lifting acceptable?

Response:

It is anticipated that temporary lifting provisions would be adequate. However, it is the scope of the Consultant to ensure that new equipment is designed with consideration of operations and maintenance requirements.

Question 11

Are there seasonal operational constraints (e.g., high demand periods) that must be

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Addendum Page 5 of 9 considered in sequencing work?

Seasonal operational constraints should be considered during the design phase and proposed work restrictions should be coordinated with GLWA operations staff. Refer to Attachment 8 REQ-0002500 SWWTP Distribution of Hourly Flow Data (1).pdf for historical flow data and response to question 3 for capacities.

Question 12

Will GLWA require salvage or storage of any removed materials?

Response:

It is not anticipated that GLWA will require salvage or storage of any removed materials, but this will depend on what is demolished in the design. The consultant should coordinate this question with GLWA O&M staff during the design.

Question 13

Is there a specific format or platform GLWA prefers for tracking and resolving design comments (e.g., e-Builder)?

Response:

GLWA has a comment resolution word file that can be used for tracking and resolving design comments. Other approaches may be proposed for consideration.

Question 14

Is the $17M estimate inclusive of contingencies and what percentage, or will contingencies be added separately?

Response:

Disregard the $17M. The goal for construction costs is $23M inclusive of escalation, allowance and contingency. See Item 2. CHANGES TO ATTACHMENT NO. 1 - GLWA Engineering Design Services Contract.

Question 15

Are there preferred protocols or for confined space monitoring equipment?

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Addendum Page 6 of 9

There is not a preferred protocol for confined space monitoring equipment.

Refer to Attachment No.1 REQ. 0002500 GLWA Engineering Design Services Contract.pdf Article 1.02 and Exhibit A General Requirements #12.

Question 16

Several of the record drawings related to the walking beam floc improvements appear to be of very poor quality. Is clearer record drawing information available?

See response to Question 1.

Question 17

Can monthly operating reports showing coagulant dosing and flows be made available?

Response:

This information can be made available, and the successful proposer shall coordinate with GLWA operations and engineering to obtain any necessary information to finalize the design.

Question 18

Can raw and settled water quality reports be made available, including periods of seasonal changes?

Response:

This information can be made available, and the successful proposer shall coordinate with GLWA operations and engineering to obtain any necessary information to finalize the design.

Question 19

Also, for the physical modeling task – CFD may be sufficient to evaluate the flow characteristics of the basin; can this be included as an optional task to potentially reduce cost?

Response:

The intent was that CFD would be used to develop the design, and physical modeling would underpin the final design. This was to ensure the best chance that the Act 399 permit would be approved by the State of Michigan and to

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Addendum Page 7 of 9 minimize risks of major surprises that could result from an error in the CFD model. If the Consultant believes that CFD alone would be sufficient based on their expertise, GLWA would be willing to consider this and should be reflected in the proposal. If physical modeling is captured as an optional task, the work plan in the proposal should explain when this would be used.

Question 20

What type of hydraulic calculations/information is available from the walking beam design of the plant?

Response:

The O&M for the walking beam flocculators has been uploaded to Bonfire as Attachment No. 14 as part of this addendum.

Question 21

Any limitations on which basin is to be decommissioned? Can the currently out of service basin be brought back online if necessary for construction sequencing?

Response:

Basin 1A has been decommissioned and ideally the construction sequencing would avoid having to restore. To bring Basin back into service, even on a temporary basis, may require manual sludge cleaning before and after usage and potentially could require that some level of flocculation be provided. Note that since Basin 1A was decommissioned, it will be the only basin at SW without a chain and flight system.

Question 22

What is the Minimum Qualifications Statement upload that is required in Bonfire?

Bidders are to provide statements demonstrating their ability to meet or exceed the requirements listed in the Solicitation Cover, Section 2 Minimum Qualifications.

Question 23

Where do we upload Attachment 11 - Task Cost Matrix? Seems to be missing on bonfire.

7/24/2024

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Addendum Page 8 of 9

Bonfire has been updated to allow Bidder to upload the excel spreadsheet.

Question 24

Where do we upload Attachment 12 - Solicitation Subcontractor List? Seems to be missing on bonfire.

Bonfire has been updated to allow Bidder to upload the Solicitation Subcontractor List (PDF).

Question 25

For the BID Plan, must we submit a 3-page Executive Summary in 11-point font, or can we just submit the form included in Attachment 10 - REQ-0002500 B.I.D.

Requirements?

Response:

Please complete the B.I.D. form included. Feel free to submit any supporting documents and copies of any diversity certifications.

Question 26

Is the 75-page limit only for the Technical Work Plan on page 8 of 14, or does it also include the Experience and Qualifications section on page 9 of 14? Does the 75-page limit include resumes?

Response:

The 75-page limit was for the Technical Work Plan section. There was no page limit specified for the Experience and Qualifications section.

Question 27

The project milestone table at the end of Exhibit A shows 270 days from NTP for Final Design Phase. Please confirm?

Response:

See Item 2. CHANGES TO ATTACHMENT NO. 1 - GLWA Engineering Design Services Contract.

7/24/2024

Document #:

FSA_PRO_TPL_0009

Revision Date:

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Revision#:

Document Title:

Addendum

Document Owner/Department:

Procurement Team

Addendum Page 9 of 9

Question 28 approved capacity rating in the sanitary survey for the Southwest WTP. Please state EGLE's approved rating for the flocculation/sedimentation process by basin and any justification EGLE has provided to GLWA for that rating.