Targeted Exterior NDE & Structural Integrity Verification of Stainless Steel Coal Silos for GREC

GRAND RIVER DAM AUTHORITY RFQ# 4113
Solicitation Cover Page
1. Solicitation #: RFQ 4113
2. Solicitation Issue Date: October 2, 2026
3. Brief Description of Requirement:
The Grand River Dam Authority is seeking responses for Targeted Exterior NDE & Structural Integrity Verification
of Stainless Steel Coal Silos for GREC
4. Response Due Date: Monday, October 12, 2026 Time: 1:00pm CDT
5. Contracting Officer:
Name: Sarah Briley
Phone: (918)824-7542
Email: sarah.briley@grda.com
Grand River Dam Authority is an agency of the State of Oklahoma.
GRDA Engineering & Technology Center * 9933 E 16th Street * Tulsa, Oklahoma 74128 *918-256-5545

GRAND RIVER DAM AUTHORITY RFQ# 4113
This is a standard bid. Please scan and email your quote to sarah.briley@grda.com. The bid opening date for
this RFQ is Monday, October 12, 2026 at 1:00pm Central Time. Questions can be submitted until Thursday,
October 8, 2026 at 1:00pm Central Time.
A completed non-collusion certificate is required and must be submitted with your bid.
This form must be signed by an authorized representative of your company in the space provided in the
lower right-hand corner of this form.
MINIMUM SAFETY REQUIREMENTS
The Grand River Dam Authority (GRDA) will consider the safety records of potential contractors prior to
awarding bids on contracts. Any bid submitted must include the following documents:
The Bidder shall include the past five (5) years' Occupational Safety and Health Administration (OSHA) 300
and OSHA 300A logs
The Bidder shall include the past five (5) years' National Council on Compensation Insurance (NCCI) worker's
compensation experience rating sheets
GRDA requires that Bidders answer the following questions and submit supporting documentation upon
request:
1. Does the Bidder have a written safety program? Yes No
2. Does the Bidder conduct regular site safety inspections? Yes No
3. Does the Bidder have an active safety training program? Yes No
If any subcontractors are used, Contractor must obtain advanced GRDA approval in writing. Prior to such
approval, all subcontractors may be required to submit the documents defined in the Minimum Safety
Requirements section of this document.
The award to the successful bidder will be based on the best value bid received that meets the specifications
listed below and the requirements herein. This includes, but is not limited to, the following in no order of
precedence: price, delivery, adherence to specifications and ability to meet the needs of the project.
Preference may be given to vendors that accept EPay as method of payment if analysis estimates that such
appears to result in a lower cost to GRDA. Additional payment terms may also be taken into consideration
in the analysis process.
GRDA will take into consideration past performance and ability to meet delivery deadlines in the evaluation.
Grand River Dam Authority is an agency of the State of Oklahoma.
GRDA Engineering & Technology Center * 9933 E 16th Street * Tulsa, Oklahoma 74128 *918-256-5545

GRAND RIVER DAM AUTHORITY RFQ# 4113
****** Read the General Bidding Instructions attached to this RFQ for further instructions. ******
Grand River Dam Authority is an agency of the State of Oklahoma.
GRDA Engineering & Technology Center * 9933 E 16th Street * Tulsa, Oklahoma 74128 *918-256-5545

ADMINISTRATION
PO Box 669
Chouteau, OK 74337
918-256-5545
GRDA payment options are EPay (Preferred Payment Method) or ACH. Only one
form is required to be completed and returned.
GRDA Visa Payment (EPay Program)
Preference may be given to vendors that accept EPay as method of payment if
analysis estimates that such appears to result in a lower cost to GRDA. Additional
payment terms may also be taken into consideration in the analysis process.
NOTE: This is not a credit card payment at time of sale (POS transaction). It is an
electronic VISA payment after an invoice has been submitted and processed for
payment. Payment terms on VISA payments are in accordance with those agreed upon
on the solicitation and the resulting PO/Contract.
When a vendor elects to accept payment by EPay, the vendor will be assigned a 16-digit
ghost account number (no physical plastic) which remains at a zero credit limit until an
invoice is received from the vendor and processed by GRDA Accounts Payable. Once
an invoice from a vendor has been processed for payment the vendor will receive a
secure remittance advice via email providing the invoice information and full card
account information authorizing the vendor to run the card and post the transaction at
which time the account credit limit will return to zero until the next payment.
To learn more about the benefits of the Visa payment program, and to obtain answers to
FAQ, click or copy and paste the following URL into your browser:
www.bankofamerica.com/epayablesvendors.
Will accept payment by Visa: Yes ____ No ____ (check one)
Visa acceptance signature: _________________________
Designated Accounts Receivable Contact for Visa remittance advices:
Name: __________________________
Phone: __________________________
Email: __________________________
If a vendor elects to not accept EPay as the payment method, additional terms which
provide discounts for earlier payment may be evaluated when making an award. Any
such additional terms shall be for discounts for payment to be made no less than ten (10)
days and may increase in five (5) day increments up to thirty (30) days. Discounts offered
must be in half or whole percent increments. The date from which the discount time is
calculated shall be the date of a valid invoice. An invoice is considered valid if it is sent to
the proper recipient, the invoiced goods or services have been received, and the invoice
includes sufficient detail as identified in the solicitation.

ADMINISTRATION
PO Box 669
Chouteau, OK 74337
918-256-5545
GRDA Request for ACH Transaction and Authorization Form
This form does not need to be filled out if you accept EPay as the form of payment.
If this form has already been provided to GRDA and you are currently being paid
by ACH you do not have to fill the form out again.
This form has previously been provided to GRDA. YES:______
Thank you for providing the following information as GRDA moves toward a more
efficient method of ACH as the payment method to our vendors. Please add the ACH
routing and account number to future invoices if possible.
Vendor Information
Name:_______________________________
Address: _____________________________
City:_______________ State:____________ Zip Code:___________
Email: _______________________________
Phone:_______________________________
Send EFT Email Remittance Advice Yes No
If yes, please include email address: ________________________________________
ACH Delivery:
Bank Routing Number: ___________________________
Account Number:________________________________
Bank Name: ____________________________________
Bank Address: ___________________________________
City:_______________ State:____________ Zip Code:___________
Beneficiary Name: ________________________________
Vendor verification signature: __________________________________
Thank you for your business!
Sincerely,
Accounts Payable Department
Accounts.payable@grda.com

SCOPE OF WORK (SOW)
STRUCTURAL INTEGRITY & NON-DESTRUCTIVE
TESTING ASSESSMENT COAL STORAGE SILOS
GRAND RIVER DAM AUTHORITY
GRAND RIVER ENERGY CENTER
GENERAL DESCRIPTION
The Grand River Dam Authority, hereinafter referred to as GRDA, is requesting proposals to
perform a condition evaluation of remaining shell material thickness for the existing coal silos at
the GRDA Grand River Energy Center, located near Chouteau, Oklahoma (approximately 45
miles East of Tulsa, Oklahoma). The Vendor must have a proven and demonstrable record of
performing complete Non Destructive Testing for large-scale industrial equipment.
PROPOSAL REQUIREMENTS
The proposal must provide sufficient detail for GRDA to perform a complete bid evaluation.
The bidder shall comply with all requirements in the SOW specification. If the bidder chooses to
submit an optional proposal, GRDA may consider this option. Bid proposals shall become the
property of the Grand River Dam Authority.
PROJECT TITLE: Targeted Exterior NDE & Structural Integrity Verification of Stainless
Steel Coal Silos
METHODOLOGY: Rope Access (RA) Phased Array Ultrasonic Testing (PAUT) with B-Scan
Imaging
PROJECT OBJECTIVE
The objective of this project is to perform a baseline exterior non-destructive examination and
wall thickness evaluation on seven identical unpainted stainless steel coal silos. The inspection
will establish structural wall thickness baselines, evaluate interior sliding wear, and verify the
integrity of critical shell welds to support a 10-year service life extension.

STANDARDIZED INSPECTION PROTOCOL (PER SILO)
Each of the seven silos shall be inspected according to the following baseline protocol:
Top Shell (A-36 CS) -------- Visual / Spot Check
Dissimilar Weld ------------ 100% PAUT Band (35'9" Elevation)
Mid Shell (304 SS) --------- 4x Vertical Strips (N, S, E, W)
Shell Stiffener -------------- 1x PAUT Band (Below 11'5" Ring)
Transition Weld ------------ 100% PAUT Band
Cone / Hopper Zone ------ 4x Vertical PAUT Strips + Low Nozzle Sweep
Zone A: Shell-to-Cone Hopper Transition (High Stress & High Wear Zone)
* Transition Ring Weld: Perform a 100% continuous encoded PAUT B-scan sweep
along the shell-to-cone transition weld.
* Cone Shell Profiling: 360
Perform four (4) continuous vertical PAUT B-scan strips running from the
o
I.D. transition ring down to the bottom nozzle, spaced at intervals ( ).
o
Perform a PAUT band around the lower cone shell directly above the dis2c3h'arge
nozzle (maximum sliding abrasion zone). 90 N,S,E,W
0
Zone B: Lower Cylindrical Shell ( Type 304 Stainless Steel)
* High-Load Shell Band: Perform. 3o7ne5 'f'ull circumferential PAUT B-scan band around
the shell plate immediately below the first structural stiffener ring at transition.
* Vertical Shell Strips: Perform four continuous vertical PA0UT scan lines ( )
extending from the transition ring up to the elevation to evaluate shell wall
thickness ( nominal) and check for localized thinning or deformatiNNon,SS p,aEEtt,eWWrns.
35'9''
Zone C: Dissimi0la.3r7 M5'e'tal Girth Weld ( Elevation)
* Dissimilar Joint Inspection: Perform3 a5 1'090''% continuous encoded PAUT B-scan strip
across the girth weld joining the Type 304 Stainless Steel shell to the A-36
Carbon Steel upper shell. 0
* Objective: Quantify remaining w3a/ll8 t'h'ickness and evaluate the Heat-Affecte5d/ Z1o6n''e
(HAZ) strictly for volumetric wall loss, step-down thinning, or preferential/galvanic
corrosion caused by dissimilar material contact over 40 years of service. (Note: Angle-
beam volumetric weld flaw/crack detection is non-routine and excluded from this
baseline scope).
CONTRACTOR QUALIFICATIONS & STANDARDS
* NDE Personnel: Technicians performing PAUT data acquisition and analysis must be
certified to ASNT SNT-TC-1A, CP-189, or ACCP Level II or Level III in Phased Array
Ultrasonic Testing.

* Rope Access Team: All rope access personnel must hold valid SPRAT or IRATA
certifications.
* Code Compliance: Inspections shall be performed in general accordance with:
ASME Section V, Article 4 (Ultrasonic Examination Methods for In-Service
o
Inspection)
API 579-1 / ASME FFS-1 (Fitness-for-Service guidelines for evaluating flaws
o
and wall loss)
EQUIPMENT & CALIBRATION
* Instrumentation: Multi-element PAUT flaw detector configured for 0 degrees longitudinal wave
scanning with continuous data-logging, linear encoder, and high-resolution B-scan visual
cross-sectional output.
* Couplant: Low-halogen, low-sulfur couplant certified safe for use on austenitic stainless
steel.
* Calibration: Pre- and post-job calibrations must be conducted on dual-material calibration
blocks representative of both the - Type stainless steel plate
( and ) and the - carbon steel plate ( ).
AA 240 304
0.250'' 0.375'' AA 36 0.3125''
DELIVERABLES & REPORTING
The Contractor shall submit a final electronic report within 10 business days of field completion
(with immediate verbal/written notification of any rejectable planar flaws or severe wall loss
found on site):
1. Data & Inspection Summary: A clean tabular summary of all measured wall thicknesses
per silo, explicitly highlighting any localized thinning exceeding 30% of nominal wall
thickness to be evaluated for Fitness-for-Service and remaining service life.
2. B-Scan Data Sets: High-resolution cross-sectional profiles of the transition weld, the
stainless-to-carbon girth weld, and vertical shell strips.
3. Comparative Thickness Log: Direct side-by-side comparison of historical cone thickness
readings versus current PAUT data.
4. Indication Map: Precise location (grid coordinates, elevation, and depth) of any detected
wall thinning below engineering thresholds or HAZ corrosion anomalies.
5. Certifications: Calibration sheets and technician qualification records.

GENERAL SAFETY REQUIREMENTS
The Contractor shall provide all personnel safety equipment for the Contractor's on site
employees. This shall include but is not limited to, hard hats, eye protection, hearing protection,
fire resistive clothing and steel toed safety shoes meeting ANSI Z41.1 requirements.
The Contractor shall comply with applicable industry safety standards and regulations and
immediately correct any safety deficiency identified by GRDA.
The Contractor will demonstrate full qualification for inspection services.
The Contractor shall supply and use rigging and lifting equipment of ample capacity to perform
the required work. The Contractor shall inspect all such equipment and maintain the equipment
in excellent operational condition.
GRDA has no duty to maintain first aid facilities at this site. Public medical facilities are
available in Pryor, Oklahoma. The Vendor may receive a copy of the site Emergency Action
Plan. This plan details the procedures for the contacting of ambulance and air ambulance
services.
All Contractor personnel must attend a GRDA safety orientation training class conducted on site
prior to beginning work. Classes are administered by a GRDA safety representative and must be
scheduled with the GRDA Designated Representative.
The Contractor agrees that GRDA is an agency of the State of Oklahoma, and is required to enforce
all applicable rules, regulations and statues governing a state agency. Contractor shall not use, or
allow the use of, tobacco in any form on GRDA property.
SPECIFIC SAFETY REQUIREMENTS
GRDA will consider the safety records of potential contractors prior to awarding bids on contracts.
Any bid submitted must include the following documents:
* The Bidder shall include the past five (5) years' Occupational Safety and Health
Administration (OSHA) 300 and OSHA 300A logs.
* The Bidder shall include the past five (5) years' National Council on Compensation (NCCI)
worker's compensation experience rating sheets.
Bidders are required to answer the following questions and submit supporting documentation upon
request:
* Does the Bidder have a written safety program? YES NO
* Does the Bidder conduct regular site safety inspections? YES NO

* Does the Bidder have an active safety training program? YES NO
ADDITIONAL ITEMS
The Contractor shall provide all labor, supervision, certified personnel, equipment, materials,
scaffolding, and safety gear necessary to execute the inspection. The assessment and subsequent
engineering evaluation shall reference applicable industry standards, including but not limited to:
* API 579-1 / ASME FFS-1: Fitness-For-Service
* ASNT SNT-TC-1A: Personnel Qualification and Certification in Non-Destructive Testing
A Hot Work Permit is required for any and all hot work per twelve hour shift. If grinding or power
brushing is to be used for inspection preparation, a Hot Work Permit will be required. Contractor
shall adhere to all requirements of the permit and provide personnel to serve as Fire Watch and
provide their own fire extinguishers.
GRDA does not maintain first aid facilities at this site. Public medical facilities are available in
Pryor, Oklahoma. The successful Vendor will receive a copy of the site Emergency Action Plan.
This plan details the procedures for the contacting of ambulance and air ambulance services.
SITE SECURITY
Companies requesting access to perform work at the Grand River Energy Center (GREC) will
submit a completed Manpower List and provide the legal name, email address, and a headshot
photo of every contract employee to grecbadging@grda.com prior to site arrival. The legal name
and email will then be submitted to Accurate Background, Inc. to start the process of a
background check. GREC Badging personnel will respond to the company representative who
requested the check after it is entered in the system. Your contract employee must follow the
link sent from Accurate Background and enter all required information in order for the
background check process to start. After all information is entered, the background check takes
approximately 5-7 business days. After a completed and successful background check, the
GREC Badging Personnel will create a badge using the provided headshot photo. The contract
employee must report directly to the GREC Badging Station located at the Administration
Building Entrance southeast of the South Gate to pick up their completed badge after they
provide a photo ID for verification. If a headshot photo was not previously provided for the
contract employee, employee must wait to have badge made in the office. Prior to background
check completion and badge retrieval, contract employees are not permitted site access. For
further assistance, contact your GRDA Representative.