Addendum No. 1

To: All Plan Holders

Airport: Dalhart Municipal Airport

Date: Tuesday, May 12, 2026

Project: Apron and Taxiway Reconstruction

KSA Project No.: 103412

TxDOT CSJ No.: 2604DHART

The plans, specifications, and contract documents are modified as described below. All bidders shall acknowledge receipt of this and all other addenda on page 4 of the revised bid form titled Revised per Addendum No. 1. This addendum becomes a part of the contract documents. All provisions of the original plans, specifications, and contract documents shall remain in full force and effect, except as modified by this addendum.

I. Contract Document Revisions

A. Bid Form

Replace with the attached Revised Bid Form. Note that the award of bids will be based on the bid items and quantities as listed in the Revised Bid Form. Any variance in bid submittals from the Revised Bid Form will result in the bid being disqualified.

II. Plan Revisions

A. Plan Sheet G01, Cover Sheet

1. Added Taxiway Pavement Strength callout.

B. Plan Sheet G02, Summary of Quantities and Sheet Index

1. Updated the Summary of Quantities to match the Revised Bid Form.

III. Specification Revisions

A. KSA Specification Item 105, Safety and Security

1. Delete this item in its entirety and replace with the attached KSA Specification Item 105, Safety and Security shown as Addendum No. 1 in the footer. Revised to show payment for Barricades for Pavement Closure as Linear Foot instead of Lump Sum.

IV. Contractor Questions

A. Lime Treated Subgrade P-155-2.4 Soil states this work shall of onsite materials with a sulfate content less than 0.3%. I do not see in the Geotech where the soils were tested for sulfate content. Can you confirm onsite materials meet this requirement?

1. Answer: Sulfate content of the subgrade will be tested at the beginning of construction. If sulfates exceed the allowable limit, a contract modification will be negotiated.

B. Lime Treated Subgrade P-155-6.7 Finishing & Curing states the completed shall be moist cured for min 7 days but not more than 14days without protection. Will prime coat suffice as protection for lime treated subgrade?

1. Answer: A prime coat will be allowed as protection if a lime stabilized subgrade must be left exposed for more than 14 days before placement of the following paving layer. The cost of the prime coat will be solely the Contractor’s responsibility.

Addendum No. 1 05/12/2026

V. Attachments

A. Revised Bid Form

B. Revised Plan Sheet G01, Cover Sheet

C. Revised Plan Sheet G02, Summary of Quantities and Sheet Index

D. KSA Specification Item 105, Safety and Security

E. Pre-Bid Meeting Minutes

F. Pre-Bid Meeting Sign In

Addendum No. 1 Issued By:

KSA

Clayton Scales P.E.

Senior Project Manager

TBPE Firm Registration No. F-1356

KSA

Trevor Self P.E.

Project Manager

TBPE Firm Registration No. F-1356

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05/12/2026

DALHART MUNICIPAL AIRPORT

DALHART, TEXAS

APRON AND TAXIWAY

RECONSTRUCTION PROJECT

TxDOT CSJ No. 2604DHART KSA PROJECT No. 103412

ISSUED FOR BID ADDENDUM No. 1

FEBRUARY 2026

RECOMMENDED BY:

KSA ENGINEERS, INC

TBPE FIRM REGISTRATION No. F-1356

CLAYTON SCALES, P.E. 05/12/2026

SENIOR PROJECT MANAGER

TREVOR SELF 05/12/2026

PROJECT MANAGER

\\ksa.net\gateway\Projects\103412\008 CAD\30 Sheets\02 Civil\103412-AV-GI-COVR.dwg : COVER SHEET

LOCATION MAP

PROJECT

LOCATION

VICINITY MAP

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MAYOR

JAMES STROUD

CITY COUNCIL MEMBERS

ROGER FLEMING

TERRY STEGALL

CLINTON HALE

GARY SCHNIEDERJAN

BRUNO DeMOTS

DENNIS ROJAS

TY HANCOCK

GARY MESSER

CITY MANAGER

JJ OZNICK

AIRPORT MANAGER

HERB FERRELL

600 S. Tyler St., Suite 1625 Amarillo, TX 79101 T. 877.572.3647 www.ksaeng.com

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The taxiway pavement which is specified in this plan set for construction is designed to accommodate aircraft of gross weight (i.e. total takeoff weight) of 30,000 lbs or less.

REVISED PER ADDENDUM NO.1 05/121

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INDEX OF SHEETS

SHEET NUMBER SHEET TITLE

GENERAL INFORMATION SHEETS

G01 COVER SHEET

G02 SUMMARY OF QUANTITIES AND SHEET INDEX

G03 GENERAL NOTES

G04 CONSTRUCTION SAFETY PHASING PLAN I

G05 CONSTRUCTION SAFETY PHASING PLAN II

G06 CONSTRUCTION SAFETY PHASING PLAN III

G07 CONSTRUCTION SAFETY PHASING PLAN IV

G08 EXISTING PAVEMENT SECTION DATA & BORE

LOGS

CIVIL SHEETS

C01 PROJECT LAYOUT

C02 PHASING PLAN - PHASE 1A

C03 PHASING PLAN - PHASE 1B

C04 PHASING PLAN - PHASE 1C

C05 PHASING DETAILS

C06 DEMOLITION PLAN

C07 RECONSTRUCTION PLAN I

C08 PAVING DETAILS

C09 JOINT LAYOUT PLAN - PHASE I

C10 JOINT LAYOUT PLAN - PHASE II

C11 JOINT LAYOUT PLAN - PHASE III

C12 JOINT DETAILS

C13 POINT LAYOUT PLAN I

C14 POINT LAYOUT PLAN II

C15 POINT LAYOUT PLAN III

C16 POINT LAYOUT PLAN IV

C17 POINT LAYOUT PLAN V

C18 STORM WATER POLLUTION PREVENTION

PROGRAM

C19 STORM WATER POLLUTION PREVENTION

PROGRAM LAYOUT PLAN

C20 STORM WATER POLLUTION PREVENTION

PROGRAM DETAILS

C21 MARKING PLAN

C22 MARKING DETAILS

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Base Bid Group No. 1 - General Project Items for Reconstruction of Apron & Taxiway

Item Spec. Estimated Actual

No. No. Description Units Quantity Quantity

1.01 C-100a Contractor Quality Control Program (CQCP- Base Bid) LS 1

1.02 C-102-5.1b Stabilized Construction Exit EA 1

1.03 C-105a Mobilization (Base Bid) LS 1

1.04 KSA-105-3.1a Barricades for Pavement Closures (Base Bid) LF 3,000

Base Bid Group No. 2 - Reconstruct Parallel Taxiway - Section 1 (South to North)

Item Spec. Estimated Actual

No. No. Description Units Quantity Quantity

2.01 C-102-5.1a Installation and Removal of Silt Fence LF 1,330

2.02 P-101-5.1 Concrete Pavement Removal SY 7,189

2.03 P-101-5.2 Full Depth Pavement Repair SY 139

2.04 P-101-5.3 Concrete Spall Repair SF 210

2.05 P-155-8.1 6" Lime-Treated Subgrade SY 7,189

2.06 P-155-8.2 Lime (3%) TON 56

2.07 TxDOT 360-6.1 8" PCC Pavement SY 7,189

Base Bid Group No. 3 - Marking Removal and Replacement for Entire Reconstructed Project Area

Item Spec. Estimated Actual

No. No. Description Units Quantity Quantity

3.01 P-620-5.1a Pavement Marking Removal SF 6,514

3.02 P-620-5.1b Yellow Reflective Pavement Markings SF 4,527

3.03 P-620-5.1c Black Non-Reflective Pavement Markings SF 8,714

3.04 P-620-5.1d New Pavement Surface Preparation LS 1

Base Bid Group No. 4 - Marking Removal from Taxiway A to Jet A Fuel Tank

Item Spec. Estimated Actual

No. No. Description Units Quantity Quantity

4.01 P-620-5.1a Pavement Marking Removal SF 3,515

Additive Alternate No.1 - Reconstruct Parallel Taxiway - Section 2 (South to North)

Item Spec. Estimated Actual

No. No. Description Units Quantity Quantity

A - 1.01 C-100b Contractor Quality Control Program (CQCP – Add. Alt. No.1) LS 1

A - 1.02 C-102-5.1a Installation and Removal of Silt Fence LF 360

A - 1.03 C-105b Mobilization (Add. Alt. No.1) LS 1

A - 1.04 P-101-5.1 Concrete Pavement Removal SY 1,370

A - 1.05 P-101-5.2 Full Depth Pavement Repair SY 89

A - 1.06 P-101-5.3 Concrete Spall Repair SF 50

A - 1.07 P-155-8.1 6" Lime-Treated Subgrade SY 1,370

A - 1.08 P-155-8.2 Lime (3%) TON 11

A - 1.09 TxDOT 360-6.1 8" PCC Pavement SY 1,370

A - 1.10 KSA-105-3.1b Barricades for Pavement Closures (Add. Alt No.1) LF 520

Additive Alternate No.2 - Reconstruct Parallel Taxiway - Section 3 (South to North)

Item Spec. Estimated Actual

No. No. Description Units Quantity Quantity

A - 2.01 C-100c Contractor Quality Control Program (CQCP – Add. Alt. No.2) LS 1

A - 2.02 C-102-5.1a Installation and Removal of Silt Fence LF 320

A - 2.03 C-105c Mobilization (Add. Alt. No.2) LS 1

A - 2.04 P-101-5.1 Concrete Pavement Removal SY 989

A - 2.05 P-101-5.2 Full Depth Pavement Repair SY 56

A - 2.06 P-101-5.3 Concrete Spall Repair SF 30

A - 2.07 P-155-8.1 6" Lime-Treated Subgrade SY 989

A - 2.08 P-155-8.2 Lime (3%) TON 8

A - 2.09 TxDOT 360-6.1 8" PCC Pavement SY 989

A - 2.10 KSA-105-3.1c Barricades for Pavement Closures (Add. Alt No.2) LF 370

KSA-105-1 – Addendum No.1

ITEM KSA-105 SAFETY AND SECURITY – Addendum No.1

DESCRIPTION

105-1.1 All work shall comply with the Construction Safety & Phasing Plan (CSPP), included as an appendix, and incorporated into this contract. Required reference material associated with this item includes:

FAA AC 150/5200-18 (Latest Edition), Airport Safety Self-Inspection FAA AC 150/5210-5 (Latest Edition), Painting, Marking and Lighting of Vehicles Used on an Airport FAA AC 150/5370-2 (Latest Edition), Operational Safety on Airports During Construction

Copies of these FAA documents are available at https://www.faa.gov/airports/resources/advisory_circulars/.

The work covered by this section consists of furnishing all materials, equipment, and labor and performing all necessary operations to comply with the phasing plans and CSPP, including, but not limited to, all barricades, marking and lighting associated with construction safety and phasing and traffic control.

105-1.2 BARRICADES AND MARKING. Proper marking, barricading and lighting of areas on the airfield associated with the construction shall be the responsibility of the Contractor. This will include properly marking, barricading and lighting closed runways, taxiways, taxilanes, and aprons, the limits of construction, critical areas on the airfield, material storage areas, equipment storage areas, haul routes, parking areas and other areas defined as required for the Contractor's exclusive use. The Contractor shall erect and maintain around the perimeter of these areas suitable marking and warning devices visible for day and night use.

Temporary barricades, flagging, and flashing warning lights shall be required at critical access points. The type and location of marking and warning devices will be approved by the Engineer. The Contractor shall be responsible for maintaining the barricades, lights, markings in their proper location, in good working order, and clean for 24 hours per day throughout the contract period.

The Contractor may be required to remove barricades and/or taxiway closure markings at the end of the work period and to reinstall the same prior to commencing work the following day in some cases to allow for the reopening of certain sections of the airport for operations outside of Contractor working hours. Removal of the barricades, and/or moving of the barricades per project phasing, shall be considered subsidiary to this project item.

Special emphasis shall be given to open trenches, excavations, heavy equipment marshalling areas, and stockpiled material located in the airport operations area, which shall be predominantly marked by the Contractor with flags and lighted by approved light units during hours of restricted visibility and darkness.

105-1.3 SAFETY PLAN COMPLIANCE DOCUMENT. Preparation of the Safety Plan Compliance Document (SPCD), as required by AC 150/5370-2G Operational Safety on Airports During Construction, will be included under this section.

METHOD OF MEASUREMENT

105-2.1 Measurement for barricades and markings will be by the linear foot as the barricades are installed and accepted in place.

105-2.3 Any work identified in this item for which there is not a specific pay item, including the Safety Plan Compliance Document, will not be measured for payment but shall be considered subsidiary to other items in the contract.

https://www.faa.gov/airports/resources/advisory_circulars/

KSA-105-2 – Addendum No.1

BASIS OF PAYMENT

105-3.1 All work performed and materials furnished as prescribed in this item shall be measured and paid for at the contract lump sum price for “Barricades for Pavement Closures”

The lump sum for “Barricades and Markings” shall be paid pro-rata per month and the monthly amount shall be calculated by dividing the lump sum by the contract time in months. The final payment for “Barricades and Markings” shall not be made until all substantial work has been completed by the Contractor, as determined by the engineer, and the Contractor has demobilized from the project site.

Payment will be made under:

Item 105-3.1a Barricades for Pavement Closures (Base Bid) Per linear foot Item 105-3.1b Barricades for Pavement Closures (Add. Alt No.1) Per linear foot Item 105-3.1c Barricades for Pavement Closures (Add. Alt No.2) Per linear foot

END OF ITEM KSA-105

Pre-Bid Meeting

Airport: Dalhart Municipal Airport

Date: Tuesday May 6, 2026

Project: Apron and Taxiway Reconstruction

Organizer: KSA Engineers, Inc.

KSA Project No.: 103412

Client Project No.: 2604DHART

I. Sign In Sheet

II. Introductions and Roles

A. J.J. Oznick – City Manager

B. Herb Ferrell – Airport Manager

C. Steve Harp, Project Manager, TxDOT Aviation

D. Kelle Chancey, Grants, TxDOT Aviation

E. Eli Lopez, DBE/HUB, TxDOT Aviation

F. Clayton Scales, Project Manager, KSA

III. Bidding Procedures

A. See Notice to Bidders and Instructions to Bidders section in Contract Documents for bidding information.

B. All bidders are encouraged to review all contract documents including Mandatory Federal Contract

Provisions, TxDOT General Provisions, Special Provisions, and Project Specifications.

C. Technical questions/comments should be submitted to Clayton Scales, (cscales@ksaeng.com or

806.335.1600). Questions must be in writing.

D. For bid document questions or other information visit the TxDOT Aviation website or call TxDOT, Kelle

Chancey at 512.633.0253. Questions must be submitted by 4 pm on Tuesday 5/12/26.

E. Sealed bids for the construction of airport improvements at the Dalhart Municipal Airport are to be delivered to Kelle Chancey, TxDOT Aviation Division, 6230 E. Stassney Lane, 2nd Floor, Austin, Texas 78744 by

Wednesday, May 20, 2026, at 2:00 p.m. At that time, bids will be publicly opened and read aloud. Any bid received after closing time will be returned unopened.

F. Bid Proposal

1. Bidders must utilize the bid proposal form provided on TxDOT’s website.

2. Bidders must provide pricing for the Base Bid and All Additive Alternate Bids. The contract award will be based on the lowest qualified bid.

G. Each bid should be furnished with a Bidder Qualifications as stated in the Contract Documents.

H. Bidder shall reference the Aviation Division General Construction Contract Provisions.

1. http://txdot.gov/inside-txdot/division/aviation/general-provisions.html

I. Contract will be awarded within __60__ calendar days from bid opening.

May 6, 2026

J. Federally funded project

1. The DBE Goal is 0%. Questions regarding DBE Goal and Good Faith Efforts should be directed to

TxDOT, Eli Lopez at 512-416-4506.

2. In accordance with 49 CFR Part 26.53 the bidder/offeror must submit an acceptable DBE plan and commitment or good faith effort no later than 5 calendar days after bid opening as a matter of responsibility.

3. The EEO Goal is:

a. 11.0% for minority participation in each trade

b. 6.9% for female participation in each trade

4. Wage rate requirements will be required as shown in the Contract Documents.

5. Buy American – Steel and Manufactured Products for Construction Contracts.

IV. Scope of Work

A. Base Bid and Alternates

1. Base Bid – Taxiway Reconstruction

2. Additive Alternate No. 1 – Additional Taxiway Reconstruction

3. Additive Alternate No. 2 – Additional Taxiway Reconstruction

B. Can visit site after the meeting.

V. Site Access / Staging Areas

A. Primary site access will be from Airport Lane, as shown on plans.

B. Staging Area is in northwest corner of the airport.

VI. Construction Safety and Phasing Plan

A. Contractor will be required to comply with FAA Advisory Circular 150/5370-2G, Operational Safety on Airports

During Construction.

1. Phase 1A: TW A/D Intersection

2. Phase 1B: TW A

3. Phase 1C: TW C/A Intersection

B. Other phasing will be considered after award, but must meet the intent of the existing phasing plans and must not significantly increase the impacts to aircraft operations.

C. Contract will be required to comply with the construction safety phasing plan on sheets G04 through G07 of the plans.

D. Safety Plan Compliance Document will be required by the Contractor. SPCD is project specific.

VII. Other Information

A. Contract Time – Will be updated in Addendum 1

1. Base Bid: 90 Calendar Days

2. Additive Alternate No. 1: 10 Calendar Days

3. Additive Alternate No. 2: 10 Calendar Days

B. Materials Acceptance by Owner / Materials Quality Control by Contractor

C. Protection of any existing utilities in the project area is the responsibility of the Contractor. Engineer has

May 6, 2026 endeavored to show all known utilities within the Contract documents, but this shall not relieve the

Contractor from full responsibility in anticipating all underground obstruction, whether or not shown on the plans; Contractor should call for utility locates and verify locations of all utilities prior to starting construction.

D. SW3P – Contractor Responsibility

E. No retainage on project. Payment will be made up to 95% of the contract amount or installed work items if over or under the current contract before final acceptance.

F. Any addenda issued will be available on TxDOT’s website.

Pre-Bid Notes:

Contract time will be updated in Addendum 1

Liquidated damages are included in the contract at $1,000/day for each calendar day to complete the work beyond the allotted time

Contract Documents and Specifications, Special Provisions, SP-4 (front end specification document) states that “on contracts equal to or greater than $500,000, the prime contractor shall perform work with its own organization on at least

30% of the total original contract cost”