P a g e 1 | 5

TO: All Proposers FROM: Sheila Hernandez, CPPB, Senior Buyer DATE: March 3, 2026 RE: RFP 26-016-SN Van Meter Substation Construction

ADDENDUM #4

Bidders are hereby notified that this addendum shall be made a part of the above-named Request for Proposal 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. QUESTIONS

Q1. We understand there is a limit of 50 pages, excluding required attachments. Can you specify if the following requirements count as required attachments or if they will be included in the page count?

• Copy of business licenses

• Financial Information: Provide an official letter from the proposer’s financial institution detailing the financial status of the proposer. The letter shall include a contact name, address, phone number, and fax number.

• Insurance Certificates: Provide copies of your current liability and workers’ compensation Certificates of Insurance. The successful proposer will be required to provide Certificate(s) of Insurance evidencing coverage.

• Provide detail on company safety: operating practices, training, manual, and overall commitment. Include documentation of the Proposer’s policies for conforming to EPA, OSHA, FAA, and DOT regulations. - Do our manuals and policies count toward the page limit or are those excluded?

• Provide a proposed man loaded project construction schedule including any subcontract work, major equipment, and outage requirements. This schedule should identify the expected timeframes for major phases of construction.

• Resumes of project personnel A1. Please reference Addendum No. 3 for revised page limitation.

Q2. We are instructed to provide four or more references of similar size projects in Tab B, and the required forms include the Experience, References and Certification form. Can you clarify if we are to list our references on that form and provide it in Tab B, or if we are to provide the references in both Tab B, and on the separate required form?

A2. Vendor must submit the KUA Experience, References and Certification form, because it is a required form. You may also include a separate, more detailed reference document in Tab B if you need additional space to describe the projects.

P a g e 2 | 5

Q3. We are instructed to provide our pricing in Tab G - but in the Required Forms list, it states to provide Exhibit A Pricing Sheet as an upload in Vendor Link Separately. Can you confirm if we are to provide it in both Tab G and separately, or only in one place?

A3. Vendor must upload Exhibit A – Pricing Sheet as a separate Excel file in VendorLink. Tab G may include notes or assumptions, but not the pricing sheet itself.

Q4. We are instructed to provide Contractual Exceptions to the sample contract in Tab F. Can you clarify if these should be listed on the Statement of Compliance and Exceptions form provided and include that in Tab F or if they should be listed both in Tab F and on the separate required form?

A4. Contractual exceptions should be addressed on the Statement of Compliance and Exceptions form. If there are none or only one or two, list them directly on the form and include it in Tab F. If there are multiple exceptions, note “see attached markups” on the form and include the contract markups as attachments in Tab F. All contractual and technical exceptions are evaluation criteria and must be clearly identified.

Q5. Will all site work be complete before start date? Will site be up to grade?

A5. Contractor is responsible for all of the sitework. Refer to posted civil plans and construction specifications.

Q6. XF containment pits – what type of fence is needed around the pits?

A6. Contractor is responsible for all of the sitework which includes providing and installing the substation wall. Refer to posted civil and station plans and construction specifications.

Q7. Is there a lay down area specified on site or will it be designated by the contractor? Any temporary Fence required?

A7. The laydown area will be designated by the Contractor. The Contractor is responsible for site security and any temporary fencing. Owner furnished equipment and materials will not be provided until permanent walls and gates are installed or temporary fencing is in place.

Q8. Is the contractor required to provide office space for either construction management or KUA representatives A8. Yes, office space (for the contractor) is the Contractor’s responsibility. All plans, specifications, submittals, permits, RFIs, schedules, and related documents must be current and available in the office for crew use and review during site meetings with

KUA.

Q9. Does each sub-contractor under the prime need to carry the Tier C $10,000,000 umbrella policy as well?

A9. No. Subcontractors are not required to carry the $10,000,000 Excess or Umbrella policy. The Prime Contractor is responsible for all subcontractor work and any resulting claims.

Q10. Please clarify cable trench specification details. Is there to be any trench drainage system installed that ties into the storm drain system?

A10. Refer to the Civil drawings, including Sheet C3.10, and the Station drawings, including Addenda 3 with new Sheet 22S101301 Detail A. Refer to Construction Specifications Section 3A9.3. All equipment and materials must be installed per

P a g e 3 | 5 manufacturer requirements. Any TRENWA installation shall follow the manufacturer’s installation instructions.

Q11. Who will be transporting switchgears and cap banks from the KUA storage area?

If the contractor is transporting what is the address of the storage location?

A11. Please reference Addendum No. 3 for details regarding transportation responsibilities and storage location.

Q12. Please clarify the warranty term requirements for the overall project because it affects the bond pricing. Is it a two-year or five-year warranty.

A12. A two-year general warranty is required for the overall project. Certain items may require longer warranty periods as specified, such as swages with a five-year warranty.

Q13. Does the contractor need to provide a Pollution policy?

A13. Contractor is responsible for the SWPPP and any requirements as noted on the Civil plans and permit documents.

Q14. Are photometric calculations required for site lightning package?

A14. No.

Q15. Are as-built surveys required for underground utilities and foundations?

A15. Yes. The Contractor must provide redlined construction plans showing underground utility locations. A signed and sealed survey is also required after project completion and prior to final acceptance, including ground contours, pad and foundation locations, walls, and cable trenches.

Q16. On the required form checklist Exhibit B and Exhibit C are included specifications and requirements, is there a signature form that needs to be included in the bid package for these items?

A16. No. Exhibit B and Exhibit C are core construction documents included for reference and compliance. They do not require a separate signature form to be submitted with the bid package.

Q17. In the BID REFERENCE DOCUMENTS\EQUIPMENT CUTS\EQUIPMENT REFERENCE DOCUMENTS there is some documents: a. 6 foot cantilever light bracket

b. 30ft Static Cast Concrete Pole Valmont c. SBI Installation Detail 0001835 (Spline Ball Ionizers) d. KUA Wall 10H 170C (KUA Wall) Question: For these items, do we only consider installation or do we also need to supply the materials? The doubt arose because the folder name is "OWN. FURNISHED OWN. INSTALLED A17. The spline ball ionizers and substation wall are contractor furnished and contractor installed. Owner furnished owner installed equipment is limited to one 30-foot concrete light pole with a 6-foot bracket and light located at the station access road entrance.

Q18. Should field acceptance tests of the equipment be included in the proposal (Current injection, winding resistance)? I would like to understand at what stage of commissioning this will not be included in the scope of this RFP.

A18. Field acceptance testing such as current injection and winding resistance is not included in this RFP scope. Bidders shall price to the RFP as issued. Additional testing and commissioning may be addressed through a future change order or separate RFP.

P a g e 4 | 5

Q19. Are the substation control racks and control and protection panels, as well as their positioning, included in the scope of this RFP?

A19. No, supply of the racks and protection panels are not included. Installation and floor mounting of owner furnished control and protection racks are included where shown on drawing EH-OSC-CH-30X42-MOO2 (see additional reference documents uploaded with this addendum). KUA will have the racks delivered to the site. The Contractor is responsible for offloading and moving them into the control building. P and C cabling and terminations are also not included.

Q20. Do the lighting poles need to be delivered already operational? I ask only to confirm if all wiring connections will be made separately.

A20. No, low voltage power cabling, wiring connections, testing, and commissioning are not included in this RFP and will be addressed under a future scope.

Q21. Is there a consolidated list of all materials with their respective quantities in XLSX format?

A21. No, a consolidated XLSX material list is not provided.

Q22. It is unclear whether the construction of the control room is included in the scope of this RFP?(the foundation ok is included as it is part of the project) A22. The Control House and PDC drawings were omitted from the bid documents in error and have been added with this Addenda for reference. Construction of the control house is not included in this RFP. The scope of RFP 26-016 is limited to pad supply and installation and the setting of the OFCI relay panels. Offloading and assembly of the control house will be performed by the Control House supplier under a separate contract (unless the pads aren’t ready by 9/1/26; see Addendum No. 3). Low voltage wiring / battery systems / protection and control wiring will be handled under a separate contract.

Q23. Are there any specifications for installing the Tensar InterAx NX650 geogrid indicating where it should be installed (throughout the substation or only in traffic areas)?

A23. Refer to the civil plans for Tensar InterAx NX650 installation. See Sheet C3.10.

The geogrid is shown only in drivable areas.

Q24. On the BOM, item # C17 is listed as a Bus support clamp, 4” IPS to 5” B.C. But on the drawing it’s shown as (2) 1033 AAC Swaged Terminal, straight. Please provide clarification.

A24. Refer to the revised drawings issued under prior Addendum No. 3 which address the BOM discrepancy.

Q25. What are the environmental testing requirements for import/export fill materials?

A25. Imported fill generally only requires source documentation confirming that it is clean, from a permitted site, and meets the fill requirements outlined in the Geotechnical report, while testing for exported fill is typically the responsibility of the Contractor or the Contractor's receiving facility.

P a g e 5 | 5

Q26. Compaction requirements for fill materials across entire site prep is to be in 6” or 12” lifts and tested every 50 cubic feet. (please confirm) A26. Based on Section 7.5 of the Geotechnical Engineering Report, all structural fill shall be placed in level lifts not exceeding 12 inches in uncompacted thickness. If hand-held compaction equipment is used, the lift thickness should be reduced to no more than 6 inches. Please refer to Section 11.0 for “In-Place Density Testing Frequency” recommendations. Please note that the fill soil recommendations in the Geotechnical Engineering Report do not apply to the stormwater retention areas (i.e., the substation yard area). For specifications within this area, refer to the Geotechnical Engineering Report and Sheet C3.01, and coordinate directly with Ardaman.

II. ADDITIONAL REFERENCE DOCUMENTS

a. ADDITIONAL REFERENCE DRAWINGS. Please refer to attached files: VAN METER CONTROL HOUSE AND PDC”. These drawings are also available in the project Dropbox.

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 RFP 26-016-SN Van Meter Substation Construction.

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.