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TO: All Proposers FROM: Jennifer Grieves, Buyer DATE: October 7, 2025 RE: IFB 25-072-JG, Transmission & Substation Structures for Van Meter

Substation

ADDENDUM #4

Bidders are hereby notified that this addendum shall be made a part of the above-named Invitation for Bid and agreement documents. The items listed below are issued to add, modify, and/or clarify the solicitation document and agreement documents. The items shall have the same force and effect as the original bidding and agreement documents, and cost involved shall be included in the bid pricing. Bids, to be submitted, shall confirm with the addition and revision listed herein. Return this sheet with your bid response.

I. CLARIFICATIONS

We are issuing attached revised drawings and Van Meter Transmission Loads for additional information and to answer questions posted in VendorLink.

II. ATTACHMENTS

1. S7400 REV C Revised Drawings

2. Markup File Drawings with questions

3. Van Meter Transmission Loads spreadsheet – please see multiple tabs

III. QUESTIONS

Q1. Please provide point loads for Structure T123 • The provided load tables are not matching the load trees. Please confirm if the attached markups are correct. (Markup file was sent to Jennifer Graves) • The arms for str #1 are not shown at 180 degrees. To facilitate a through vang connection, we need to offset the arm elevations. Please confirm if this is acceptable.

A1. Point loads are not available. Design shall be per the issued drawings. The contractor shall develop structural calculations for Structure T123 using a PLS-POLE model, to be submitted for KUA engineering review and approval. This requirement applies only to structure T123 and is not applicable to the remaining structures in the project. Load trees on SH. 4, 6, and 8 have been revised. A S7400 REV C drawing has been linked below with the changes clouded on sheets 4, 6, 8.

Load tables have been updated, please provide table and spreadsheet to vendors. Yes. The elevation change for the arm offset must also include an adjusted rise of the arm to bring the wire attachment height to the structure drawings original elevation.

Q2. Question on bidders drawing: "Should this be applied at pole face?" (Referring to loads on STR 3 and 4-6).

A2. No, they should be applied to the vang to be fabricated on face A, per "DEAD-END VANG" Detail, SH. 13. We have revised this detail for clarity on how it should be applied on pole and on the arm.

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Bidder(s) must acknowledge receipt of this addendum by signing this form below and returning it with your bid response.

Acknowledgment is hereby made of Addendum #4 to project IFB 25-072-JG, Transmission & Substation Structures for Van Meter Substation.

Bidder Signature Date

Bidder Printed Name Company Name

This addendum is issued to provide additional information, clarification, corrections, additions, deletions and/or to answers questions concerning the above referenced solicitation. All information provided in this addendum is incorporated into the solicitation document as if set forth therein. All other parts of the solicitation have been maintained as originally distributed.

This addendum supersedes any verbal or other instructions given to any proposer qualified to respond pursuant to the requirements set forth in the solicitation document.