STATEMENT OF WORK

WATER TREATMENT SERVICE FOR POWER PLANT

WHITERIVER SERVICE UNIT

WHITERIVER, ARIZONA

FEBURARY 2026

A. INTRODUCTION:

The Contractor shall provide comprehensive chemical water treatment services for the Whiteriver Indian Health Service Unit (WRSU), 200 West Hospital Drive, Whiteriver, Arizona. There services are to be delivered and administered at the Power Plant’s cooling system and heating systems.

B. BACKGROUND:

WRSU requires experienced chemical water treatment services to operate reliably and safely in a cost-effective manner. The WSRU systems requiring treatment include the Central Plant cooling towers, Central Plant condensing boilers, Central Plant water softener, Central Plant Heating closed loop, Central Plant cooling closed loop Specialty Services Building (SSB) cooling tower, and SSB closed loop. System component details identified in Section E.

C. SCOPE OF REQUIREMENT:

The scope of work includes providing monthly onsite inspections, water testing, and chemical water treating for the Central Plant cooling towers, Central Plant condensing boilers, Central Plant water softener, Central Plant heating closed loop, Central Plant cooling closed loop, SSB cooling tower, and SSB closed loop. The contractor shall also test and report the makeup water characteristics. The contractor shall chemically treat the water to keep systems free from scale, corrosion, and microbiological contamination. The contractor shall also treat the water to keep from freezing. The results of these inspections and testing along with the associated chemical treatment actions shall be summarized in a monthly report to the COR. The contractor shall provide all chemical testing reagents, testing kits, testing instrumentation, and treatment chemicals. Testing shall occur mid-month to ensure testing occurs during each calendar month as required by Joint Commission standards.

D. DELIVERABLES:

1. Proof of Qualifications: The contractor shall provide a qualification packet which shall include business capability, list of similar service contracts completed, licenses held, list of representative agreements, certifications held to include ISO, and a list of qualified technicians who will perform the work.

2. Chemical Water Testing: The contractor shall perform water testing for alkalinity (ppm as CaCO3), calcium hardness (ppm as CaCO3), conductivity (as μmhos), conductivity cycles (calculated), freeze point (°F), molybdenum (ppm as Mo), on-Trac (ppb), pH, and total hardness (ppm as CaCO3). The contractor shall provide all chemical testing reagents, testing kits, and testing instrumentation.

3. Chemical Water Treatment: The contractor shall chemically treat the water in the Central Plant cooling towers, Central Plant condensing boilers, Central Plant heating closed loop, Central Plant cooling closed loop, SSB cooling tower, and SSB closed loop to ensure the water testing results are within the ranges as outline in Table 1 below. The contractor shall provide all chemicals required to successfully achieve the required water characterizes as identified in Table 1 below. Mild steel and copper coupons shall be provided and installed in all cooling tower and closed loop systems. The coupons shall be removed and tested on a 90-day cycle.

Table 1

4. Inspection: The contractor shall inspect the chemical feed, control equipment, and all treated mechanical systems. The contractor shall check and clean all controller sensors, probes, and flow switches. The contractor shall check for leaking the water systems of the cooling towers, boilers, and closed loops since leaking will result in loss of chemical treatment.

5. Water Treatment Equipment Testing: The contractor shall test all water treatment equipment including chemical pumps and blow-down valves to ensure proper operation.

6. Reporting: The contractor shall develop a report detailing the inspection results, testing results, chemical water treatment activities, water treatment equipment testing results, and chemical inventory. The report shall include the testing results compared to the requirements outline in Table 1. The reports shall be provided to the COR no later than 7 days after the mid-month onsite visit.

7. Program Manuals: The contractor shall provide Program Manuals as a go-to reference resource for the facility engineer. Each manual shall contain: description of on-site products, Safety Data Sheets (SDS) for all products and testing reagents, recommendations and limits for each treated system, clear instructions for actions needed to maintain system conformity, complete test procedures and instructions, and chemical feed equipment information.

Test Makeup

Central Plant

Cooling Towers

Central Plant

Steam Boiler

Central Plant

Heating Closed

Loop

Central Plant

Cooling Closed

Loop

Central Plant

Water Softener

SSB

Cooling

Tower

SSB

Closed

Loop

Alkalinity, M (ppm as CaCO3)

200 Max

Total Hardness (ppm as CaCO3)

400 Max 1200 Max 0 Max

Calcium Hardness (ppm as CaCO3)

300 Max

Conductivity (as μmhos) 1200 Max 1750 Max 3500 Max 800 Max 1500 Max 2500 Max pH 8.2 Max 8.5 - 9.0 8.5 - 9.0 8.8 - 10.5

Conductivity cycles (calculated)

2.0 - 2.8 1.8 - 2.8

Molybdenum (ppm as Mo) 20 - 60 on-Trac (ppb) 70 - 150 70 - 150

Freeze Point (°F) 25 Max

E. ASSETS: The Contractor shall verify all locations and quantities.

SYSTEM COMPONENTS

COMPONENT YEAR SERIAL #

Central Plant Cooling Tower: Baltimore Aircoil cooling Towers, Series 1500 with electric heating package 2002 U3707030NAD Central Plant Cooling Tower: Baltimore Aircoil cooling Towers, Series 1500 with electric heating package 2002 U3707030NAD Central Plant Condensing Boiler - Fulton VTG-4000DF, Utilizing Only Fuel Oil 2023 F2076616A Central Plant Condensing Boiler - Fulton VTG-4000DF, Utilizing Only Fuel Oil 2023 F2076616A Central Plant Water Softener: MGT System 14 - Twin Demand 3" NXT2 Series Metered 2020 Not Applicable

SSB Cooling Tower: Marley Recold JW Series Cooling Tower 2015 JW-10104545-A1 Table 2

F. PERIOD OF PERFORMANCE

Base Year with 4 option years for the performance of this contract. Period of Performance Dates for each year will be for one year. Dates will be established upon the award of this contract by the Contracting Officer.

GOVERNMENT SITE LOCATION MAP 1

Whiteriver Hospital, Garret Building, Administration, Garrett Building, Government Housing Site (Medicine City), and Facilities Site.

Latitude: 33.8765056 Longitude: -109.9597917

900 ft

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Image © 2025 Airbus