697DCK-26-R-00374 SIR Amendment 0002- Water Treatment C90 TRACON.pdf

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

(a) By completing items 8 and 15, and returning or (c) By separate letter or telegram which includes a reference to the solicitation and amendment number. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

E. IMPORTANT: is not is required copies to the issuing office.

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NO. 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQ.NO. 5. PROJECT NO. (If applicable)

7. ADMINISTERED BY (If other than Item 6)CODE

FACILITY CODE

9A. AMENDMENT OF SOLICITATION NO.

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NO.

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. is extended. is not extended.

12. ACCOUNTING AND APPROPRIATION DATA (If required.)

copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

(x) A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT

ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14.

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15C. DATE SIGNED

15A. NAME AND TITLE OF SIGNER (Type or print)

16C. DATE SIGNED

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

PAGE

6. ISSUED BY CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code) (X)

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. CONTRACT AUTHORITY

(Signature of Contracting Officer)

PAGESOF

Contractor

The hour and date specified for receipt of Offers to sign this document and return

Alicia M. Grant

See continuation page

FEDERAL AVIATION ADMINISTRATION

AAQ-500 - REGIONAL ACQUISITIONS

10101 HILLWOOD PARKWAY

FORT WORTH TX 76177-1524

AAQ520FTW-AFN

697DCK-26-R-00374

08/05/2026

08/05/2026

1 2

CONTINUATION SHEET

REFERENCE NO. OF DOCUMENT BEING CONTINUED PAGES

NAME OF OFFEROR OR CONTRACTOR

SUPPLIES/SERVICES

(B)

UNIT

(D)

UNIT PRICE

(E)

AMOUNT

(F)

ITEM NO.

(A)

QUANTITY

(C)

697DCK-26-R-00374/0002

Solicitation/SIR# 697DCK-26-R-00374

The purpose of Amendment 0002 is to:

1) Provide answers to submitted questions.

Answers to questions are provided below;

All other terms and conditions remain unchanged.

*Submission of signed copy of this amendment is required for acknowledgement (Per SIR Amendment

Block # 11).

Period of Performance: 10/01/2026 to

09/30/2031

697DCK-24-R-00367

Amendment 0001

QUESTIONS & ANSWERS

SOLICITATION # 697DCK-26-R-00374

WATER TREATMENT SERVICES

CHICAGO TRACON - ELGIN, IL (C90)

1. Question: Who is currently operating the water treatment facilities at the facility now?

FAA Response: The incumbent for these services is HOH Water Technology.

2. Question: How many employees currently are employed at the facility? Are they employees of the FAA, the airport, or of a municipality?

FAA Response: The facility is operated by the Federal Aviation Administration. The number and employment status of personnel assigned to the facility are not relevant to the requirements of this solicitation and are therefore not provided.

3. Question: Is the facility currently under any sort of enforcement action? Consent order, etc, from an environmental enforcement agency, state or federal?

FAA Response: No. The facility is not currently subject to any known environmental enforcement action or consent order by a state or federal environmental regulatory agency.

4. Question: What is the environmental compliance history of the facility? Is that information readily available for review?

FAA Response: The facility has no known significant environmental compliance enforcement history relevant to this solicitation.

5. Question: Can you provide the annual makeup on the cooling tower? We are looking for the gallons used per year.

FAA Response: Approximately 2.5 million gallons per year.

6. Question: Please provide the approximate annual cooling-tower makeup water consumption, preferably in gallons per year.

FAA Response: Please see response to Question # 5.

7. Question: Please provide the approximate hardness and conductivity of the water discharged from the EasyWater CTF 100-S Skid that supplies the cooling-tower system.

(If annual consumption data is unavailable, the requested hardness and conductivity readings would still be helpful in determining the treatment requirements and pricing).

FAA Response: The EasyWater CTF-100-S is not a conventional water softener and does not remove hardness from the water. Based on available water-treatment records, the fresh makeup water has an average hardness of approximately 92 ppm as CaCO₃ and an average conductivity of approximately 422 µS/cm. The cooling-tower system water has an average hardness of approximately 376 ppm as CaCO₃ and an average conductivity of approximately 1,696 µS/cm.

The available water-treatment records do not provide a specific hardness or conductivity reading taken directly at the CTF-100-S discharge. The cooling-tower values represent the water within the cooling-tower system after circulation and concentration and should not be interpreted as direct post-CTF-100-S measurements.

The CTF system has three main functions:

1. Sediment Shield filtration – removes sediment, suspended solids, contaminants and bacteria through sub-micron filtration.

2. UV treatment – sanitizes the water by inactivating microorganisms.

3. No-Salt Conditioner – prevents/reduces hard-water scale and biofilm rather than removing the hardness minerals from the water.

8. Question: Could you also please confirm the cycles of concentration currently being maintained or run on the cooling tower?

FAA Response: Based on the available water-treatment records, the cooling tower operates at an average of approximately 4.0 cycles of concentration under normal operating conditions. The individual monthly calculations ranged from approximately 2.6 to 4.6 cycles, with an overall average of approximately 4.0 cycles. Cycles of concentration represent the ratio of the concentration of dissolved constituents in the cooling-tower water compared with the incoming makeup water.

9. Question: Do you have a water safety management plan?

FAA Response: The facility does not maintain a separate, stand-alone water safety management plan specifically for the cooling-tower system. Water-treatment and cooling-tower maintenance are managed through the facility's existing maintenance and water-treatment program.

10. Question: What routine maintenance is expected for the EasyWater CLS 2000-S skid system?

FAA Response: Routine maintenance should be performed in accordance with the EasyWater manufacturer's installation and maintenance requirements. The CLC-2000-S is a self-backwashing system that uses city water to backwash the Sediment Shield filtration media and discharge accumulated sediment to the drain. The system is designed for minimal ongoing maintenance. Routine maintenance includes verifying proper system operation and backwash operation, testing the water monthly, inspecting the pump, valves, controls, piping and connections, and servicing the system and treatment components as recommended by the manufacturer.

11. Question: Are you open to upgrade chemical feed system components?

FAA Response: Yes. The FAA is open to upgrades to the existing chemical feed system components if the proposed upgrades improve system reliability, chemical-feed accuracy, monitoring, water-quality control, or overall cooling-tower performance. Any proposed upgrades would be subject to FAA review and approval.

Disclaimer: The information provided in these responses is based on available facility records, water-treatment service reports, equipment information, and operating data available to the FAA at the time of response. Values provided are approximate and are intended for informational and planning purposes only. Water chemistry, water consumption, operating conditions, and equipment performance may vary over time.

Where a specific measurement was not available, the response identifies the information as an estimate or average based on available records. The FAA does not warrant or guarantee future water quality, water consumption, equipment performance, chemical usage, or operating conditions. Contractors are responsible for independently evaluating the existing systems and conditions and for developing their proposed treatment, maintenance, and pricing requirements accordingly. Nothing in these responses should be interpreted as a manufacturer's specification, engineering certification, or guarantee of system performance. Any proposed equipment, treatment methods, modifications, or upgrades remain subject to FAA review and approval.

Calculation Note: Where averages or calculated values are provided, they were derived from available water-treatment records for the period reviewed and are intended to represent typical operating conditions. These calculations should not be interpreted as guaranteed operating setpoints or future performance requirements.