J.41 Water Reports.PDF

Please see the attached PDF report.

Closing Signature

If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Lab Report Ronald Reagan Corrosion Study Results Oct 2020 to

Jan 2021Sunday, January 31, 2021 12:46 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 936 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

Report Type: General

International Trade Center - Cooling Systems

International Chemstar, Inc. - 9601 Pulaski Park Drive Suite 406, Baltimore MD 21220 (410) 391-7516

Component Conducti vity pH Traxstar 569 as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Winter Tower 1142 1400 max

8.5

7.5 - 9.5

100 min

0.06

0.2 min

Chilled Water 1931 600 min

9.4

8.5 min

400 min

Left MIOX

0 max

21682

Right MIOX

City Water 304 200 min

Component RLU

Winter Tower 119 120 max

Inventory Traxstar 569 Amount Previous Delivery Unit

Chiller plant 90

Gallons (US)

Opening Comment During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Winter Tower Online System conductivity was within the control range.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was below the control range at time of service, but biological activity was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. No action was necessary.

Left MIOX Online Softener effluent was soft during service.

Right MIOX Online Softener effluent was soft during service.

Service Report Service Report

Monday, January 11, 2021 1:35 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 145990 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:30 AM EST to 11:45 AM EST Drive Time: 1:35 PM EST to 1:35 PM EST

International Trade Center - Cooling Systems

If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Monday, January 11, 2021 1:35 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 145990 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:30 AM EST to 11:45 AM EST Drive Time: 1:35 PM EST to 1:35 PM EST

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Winter Tower 1171 1400 max

8.6

7.5 - 9.5

100 min

0.05

Chilled Water 1929

9.4

21757

City Water 360

Winter Tower 20 120 max

Inventory Traxstar 569 Amount Previous Delivery Unit

Chiller plant 60

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Summer Tower Offline Summer Tower was offline.

Winter Tower Online System conductivity was within the control range.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was below the control range at time of service, but biological activity was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. No action was necessary.

Left MIOX Online Softener effluent was soft during service.

Service Report Service Report

Tuesday, January 26, 2021 3:41 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 146203 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:15 AM EST to 11:15 AM EST Drive Time: 3:41 PM EST to 3:41 PM EST

International Trade Center - Cooling Systems

Right MIOX Online Softener effluent was soft during service.

Closing Signature If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Tuesday, January 26, 2021 3:41 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 146203 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:15 AM EST to 11:15 AM EST Drive Time: 3:41 PM EST to 3:41 PM EST

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Winter Tower 1225 1400 max

8.6

7.5 - 9.5

100 min

Chilled Water 1855

9.7

21762

City Water 610

Winter Tower 109 120 max

Inventory Traxstar 569 Amount Previous Delivery Unit

Chiller plant 235

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Winter Tower Online System conductivity was within the control range, but running low cycles. Due to the recent salting of the roads, conductivity of the incoming water has increased causing the system to run at lower cycles. This will effect chemical ranges until the incoming water conductivity returns to normal.

Scale and corrosion inhibitor (Traxstar) was below the control range; Feed rate was increased.

Biocide was below the control range at time of service, but biological activity was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. No action was necessary.

Left MIOX Online Softener effluent was soft during service.

Right MIOX Online Softener effluent was soft during service.

Service Report Service Report

Tuesday, February 23, 2021 2:01 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 146627 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 11:00 AM EST to 12:15 PM EST Drive Time: 2:01 PM EST to 2:01 PM EST

International Trade Center - Cooling Systems

If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Tuesday, February 23, 2021 2:01 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 146627 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 11:00 AM EST to 12:15 PM EST Drive Time: 2:01 PM EST to 2:01 PM EST

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Winter Tower 1201 1400 max

8.6

7.5 - 9.5

100 min

0.04

Chilled Water 1866

21782

City Water 309

Winter Tower 118 120 max

Inventory Traxstar 569 Amount Previous Delivery Unit

Chiller plant 200

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Summer Tower Online Summer Tower was offline.

Winter Tower Online System conductivity was within the control range, but running low cycles.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was below the control range at time of service, but biological activity was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. An additional test for tolytriazole (TTA; the specific component for copper corrosion inhibitor) was ran and found 4.4 ppm. Ideally, a closed loop should have over 10 ppm of TTA. The chemical pump was going to be ran, but there was a safety tag on top of the tank mentioning a leak in the injection fitting piping off of the recirculation pump. Until that is repaired by Centerra, no additional treatment can be added into the chilled system.

Service Report Service Report

Sunday, February 28, 2021 2:48 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147028 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 12:30 PM EDT to 1:15 PM EDT Drive Time: 2:48 PM EDT to 2:48 PM EDT

International Trade Center - Cooling Systems

Left MIOX Online

Right MIOX Online Softener effluent was soft during service.

Closing Signature If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Sunday, February 28, 2021 2:48 PM EST

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147028 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 12:30 PM EDT to 1:15 PM EDT Drive Time: 2:48 PM EDT to 2:48 PM EDT

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Summer Tower 944 1400 max

8.5

7.5 - 9.5

100 min

Chilled Water 1862

21762

City Water 308

Summer Tower 120 120 max

Inventory Traxstar 569 Amount Previous Delivery Unit

Chiller plant 200

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Summer Tower Online Summer Tower was offline.

Winter Tower Online System conductivity was within the control range, but running low cycles.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was below the control range at time of service, but biological activity was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. An additional test for tolytriazole (TTA; the specific component for copper corrosion inhibitor) was ran and found 4.4 ppm. Ideally, a closed loop should have over 10 ppm of TTA. The chemical pump was going to be ran, but there was a safety tag on top of the tank mentioning a leak in the injection fitting piping off of the recirculation pump. Until that is repaired by Centerra, no additional treatment can be added into the chilled system.

Service Report Service Report

Friday, March 12, 2021 3:22 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 146976 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:30 AM EDT to 12:00 PM EDT Drive Time: 3:21 PM EDT to 3:21 PM EDT

International Trade Center - Cooling Systems

Left MIOX Online

Right MIOX Online Softener effluent was soft during service.

Closing Signature If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Friday, March 12, 2021 3:22 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 146976 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:30 AM EDT to 12:00 PM EDT Drive Time: 3:21 PM EDT to 3:21 PM EDT

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Summer Tower 1120 1400 max

8.7

7.5 - 9.5

100 min

0.07

Winter Tower 1184 1400 max

8.5

7.5 - 9.5

100 min

0.01

Chilled Water 1858

21836

City Water 316

Summer Tower 39 120 max

Winter Tower 110 120 max

Inventory Traxstar 569 Amount Previous Delivery Unit

Chiller plant 180

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Summer Tower Online System conductivity was within the control range, but running low cycles.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was below the control range at time of service, but biological activity was within the control range.

Winter Tower Online System conductivity was within the control range, but running low cycles.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was below the control range at time of service, but biological activity was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. An additional test for tolytriazole (TTA; the specific

Service Report Service Report

Tuesday, March 23, 2021 9:47 AM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147130 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:30 AM EDT to 11:15 AM EDT Drive Time: 9:47 AM EDT to 9:47 AM EDT

International Trade Center - Cooling Systems component for copper corrosion inhibitor) was ran and found 4.4 ppm. Ideally, a closed loop should have over 10 ppm of TTA. The chemical pump was going to be ran, but there was a safety tag on top of the tank mentioning a leak in the injection fitting piping off of the recirculation pump. Until that is repaired by Centerra, no additional treatment can be added into the chilled system.

Left MIOX Online Softener effluent was soft during service.

Right MIOX Online Softener effluent was soft during service.

Closing Signature If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Tuesday, March 23, 2021 9:47 AM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147130 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 10:30 AM EDT to 11:15 AM EDT Drive Time: 9:47 AM EDT to 9:47 AM EDT

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Summer Tower 1089 1400 max

8.8

7.5 - 9.5

100 min

0.21

Chilled Water 1864

9.6

22014

Fountain 451 1000 max

8.3 7 - 9

0.44 1 - 3

City Water 316

Inventory Traxstar 569 Amount Previous Delivery Unit

Chiller plant 175

Sodium Hypochlorite Amount Previous Delivery Unit

Fountain Pump Room 50

Chemstar 115 Amount Previous Delivery Unit

Fountain Pump Room 7

Chemstar 301 Amount Previous Delivery Unit

Fountain Pump Room 9

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Summer Tower Online System conductivity was within the control range.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. An additional test for tolytriazole (TTA; the specific component for copper corrosion inhibitor) was ran and found 4.4 ppm. Ideally, a closed loop should have over 10 ppm of TTA. The chemical pump was going to be ran, but there was a safety tag on top of the tank mentioning a

Service Report Service Report

Tuesday, April 20, 2021 4:56 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147607 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 1:00 PM EDT to 2:00 PM EDT Drive Time: 4:56 PM EDT to 4:56 PM EDT

International Trade Center - Cooling Systems leak in the injection fitting piping off of the recirculation pump. Until that is repaired by Centerra, no additional treatment can be added into the chilled system.

Left MIOX Online Softener effluent was soft during service.

Right MIOX Online Softener effluent was soft during service.

Fountain Online Fountain conductivity was within the control range.

Biocide was slightly below the control range due to just coming online for the season. Adjustments were made to increase the static feed of the biocide.

Closing Signature If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Tuesday, April 20, 2021 4:56 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147607 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 1:00 PM EDT to 2:00 PM EDT Drive Time: 4:56 PM EDT to 4:56 PM EDT

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Summer Tower 1111 1400 max

8.8

7.5 - 9.5

100 min

0.45

Winter Tower 920

8.5

7.5 - 9.5

100 min

0.01

Chilled Water 1861

22067

Fountain 619

8.5

1.19

City Water 323

Chiller plant 155

Fountain Pump Room 45

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Summer Tower Online System conductivity was within the control range.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was within the control range.

Winter Tower Online System was offline during service. Some chemical levels may be outside their control range due to automated

Service Report Service Report

Wednesday, April 28, 2021 8:42 AM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147775 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 11:00 AM EDT to 11:45 AM EDT Drive Time: 8:42 AM EDT to 8:42 AM EDT

International Trade Center - Cooling Systems processes being halted when the system is offline.

System conductivity was within the control range, but running low cycles.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was below the control range at time of service.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. An additional test for tolytriazole (TTA; the specific component for copper corrosion inhibitor) was ran and found 4.4 ppm. Ideally, a closed loop should have over 10 ppm of TTA. The chemical pump was going to be ran, but there was a safety tag on top of the tank mentioning a leak in the injection fitting piping off of the recirculation pump. Until that is repaired by Centerra, no additional treatment can be added into the chilled system.

Left MIOX Online Softener effluent was soft during service.

Right MIOX Online Softener effluent was soft during service.

Fountain Online Fountain conductivity was within the control range.

Biocide was within the control range.

Closing Signature If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Wednesday, April 28, 2021 8:42 AM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 147775 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 11:00 AM EDT to 11:45 AM EDT Drive Time: 8:42 AM EDT to 8:42 AM EDT

International Trade Center - Cooling Systems as ppm Chlorine

, free Sodium Nitrite

Hardness , Softener Cell Hours

Summer Tower 1539 1400 max

9.0

7.5 - 9.5

100 min

0.22

Winter Tower 1169

8.9

7.5 - 9.5

100 min

0.25

Chilled Water 1841

22173

Fountain 487

8.5

0.57

City Water 330

Chiller plant 130

Fountain Pump Room 48

During today's visit the following services were performed:

* Met with on-site personnel to discuss current issues.

* Wet chemistry tests were ran to determine current system levels.

* Made adjustments based on test results.

* Chemical feed equipment was checked for operation.

Summer Tower Online System conductivity was above the control range due to the probe being dirty. The probe was removed and the line was flushed. The probe was then cleaned, calibrated, and reinstalled.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was within the control range.

Winter Tower Online

Service Report Service Report

Friday, May 14, 2021 3:38 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 148085 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 8:00 AM EDT to 9:15 AM EDT Drive Time: 3:38 PM EDT to 3:38 PM EDT

International Trade Center - Cooling Systems

System conductivity was within the control range.

Scale and corrosion inhibitor (Traxstar) was within the control range.

Biocide was within the control range.

Chilled Water Online Closed loop corrosion inhibitor was within the control range. An additional test for tolytriazole (TTA; the specific component for copper corrosion inhibitor) was ran and found 4.4 ppm. Ideally, a closed loop should have over 10 ppm of TTA. The chemical pump was going to be ran, but there was a safety tag on top of the tank mentioning a leak in the injection fitting piping off of the recirculation pump. Until that is repaired by Centerra, no additional treatment can be added into the chilled system.

Left MIOX Online Softener effluent was soft during service.

Right MIOX Online Softener effluent was soft during service.

Fountain Online Fountain conductivity was within the control range.

Biocide was slightly below the control range, but biological activity was low (52 RLU). Feed rate was increased.

Closing Signature If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Service Report Service Report

Friday, May 14, 2021 3:38 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 148085 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

On-Site Time: 8:00 AM EDT to 9:15 AM EDT Drive Time: 3:38 PM EDT to 3:38 PM EDT

International Trade Center - Cooling Systems

Coupon Type Summer Tower Summer Tower Winter Tower Winter Tower

System Type Open Open Open Open

Coupon Type Mild Steel Copper Mild Steel Copper

Coupon Number F12130 B31400 F12131 B31401

Initial Weight (g) 12.0256 13.2538 12.0159 13.2531

Final Weight(g) 11.8802 13.237 11.982 13.2456

Weight Loss(g) 0.1454 0.0168 0.0339 0.0075

Date In 01/11/2021 01/11/2021 01/11/2021 01/11/2021

Date Out 04/20/2021 04/20/2021 04/20/2021 04/20/2021

Days Exposure 99 99 99 99

Corrosion Rate 1.228 0.126 0.286 0.056

Status Open System Closed System Copper Mild Steel Copper Mild Steel

Excellent <0.1 <1 <0.1 <0.2 Very Good 0.1 - 0.25 1 - 3 0.1 - 0.15 0.2 - 0.3 Good 0.25 - 0.35 3 - 5 0.15 - 0.2 0.3 - 0.5 Fair 0.35 - 0.5 5 - 8 0.2 - 0.3 0.5 - 0.8 Poor 0.5 - 1 8 - 10 0.3 - 0.5 0.8 - 1 Severe >1 >10 >0.5 >1

Comment All corrosion rates for the Jan 2021 through April 2021 period returned "Very Good" or better. No changes are necessary and the current chemical program will be maintained.

Closing Signature

If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Lab Report Corrosion Coupon Rpt 04-20-21

Monday, May 17, 2021 4:13 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 1032 Recorded By: Jennifer Wood

(410) 391-7516 jwood@chemstarwater.com

Report Type: Coupon

International Trade Center - Cooling Systems

No Legionella was isolated in the May 2021 sampling of the Summer or Winter cooling tower. Please see the attached PDF for lab data.

Closing Signature

If you have any questions regarding the service report or the water treatment program in general, please do not hesitate to contact me.

Thank you, Dan Pruitt, C.W.T.

Field Service Manager dpruitt@chemstarwater.com 410-322-1478 Chemstar Water

Lab Report May 2021 Legionella Report

Tuesday, May 25, 2021 5:07 PM EDT

Centerra Integrated Services Ronald Reagan Bldg.

1300 Pennsylvania Ave. NW Washington DC 20004

(703) 440-1333

Report Number: 1037 Recorded By: Dan Pruitt

(410) 322-1478 dpruitt@chemstarwater.com

Report Type: General

International Trade Center - Cooling Systems