A6_Microbial Inspection Report.pdf

TETRA TECH

7100 Commercial Avenue Suite 4, Billings, MT 59101

Tel +1. 406.248.9161 | Fax +1. 406.248.9282 | tetratech.com

October 29, 2024

Mr. Markus J. Henneke, P.E.

Page IMEG Joint Venture, LLC 1100 Louisiana Street, Ste 1 Houston, Texas 77002-5246

Delivered via email: markus.j.henneke@imegcorp.com

SUBJECT: Visual Microbial, Moisture Investigation, and Bioaerosol Ambient Air Sampling Report Project No. NZAS 10-0007 Dorm 742 Malmstrom Air Force Base Malmstrom AFB, Great Falls, Montana Tetra Tech Project No: 117-743546-24001

Dear Mr. Henneke:

From June 13, 2024, Tetra Tech, Inc. (Tetra Tech) conducted a visual microbial, moisture investigation, and bioaerosol ambient air sampling for the above referenced site. Based on correspondence with you before the commencement of the project, Tetra Tech was instructed to evaluate Dorm 742 for renovation purposes.

Details of our assessment are provided below.

METHODS

Tetra Tech generally followed methods developed by the National Institute for Occupational Safety and Health (NIOSH), as referenced in the Guidance for Indoor Air Quality Investigations (NIOSH, 2017). A combination of visual assessment and air contaminant sampling was conducted using the methodologies described below.

Moisture and Visual Microbial Assessment

The assessment included the visual inspection of mold growth and excess moisture. Areas that are typically associated with water damage such as bathrooms, roofing penetrations, windows, and drains were inspected for signs of excess moisture, past or present water damage, presence and condition of piping, damp depressions, standing water, substrate decay, stained areas, and any visible evidence of mold growth.

Tape Lift Surface Sample Collection

Tetra Tech collected three tape lift surface samples in Rooms 101, 134, and 214 where visible mold growth was present to identify mold species. Following sample collection, the tape lift surface samples were shipped under the completed chain of custody (COC) to International Asbestos Testing Laboratories (iATL) of Mt.

Laurel New Jersey, an American Industrial Hygiene Association (AIHA) accredited laboratory, for microbiological analysis to identify spore type.

Bioaerosol Air Sample Collection

A visual inspection of the facility was conducted for the presence of visible mold growth and excess moisture.

Areas that are typically associated with water damage such as bathrooms, roofing penetrations, wall mounted AC units, and drains were inspected for signs of excess moisture, past or present water damage, presence and condition of piping, damp depressions, standing water, and any visible evidence of mold growth.

mailto:markus.j.henneke@imegcorp.com

Visual Microbial, Moisture Investigation, and Bioaerosol Ambient Air Sampling Report

Project No. NZAS 10-0007 Dormitory 742

Malmstrom Airforce Base Malmstrom AFB, Great Falls, Montana

2 October 29, 2024

Tetra Tech’s sampling was conducted while the heating ventilation and cooling (HVAC) system was not in operation. Tetra Tech utilized a vacuum pump calibrated at a flow rate of approximately 15.0 liters per minute (lpm) with a sample collection time of approximately ten minutes for each sample. The Samples were collected using Air-O-Cell® disposable IAQ monitoring cassettes (Spore trap) for the sampling and collection of aeroallergens and bioaerosols for quantitative analysis of mold spores. Following sample collection, sample cassettes were shipped under completed COC to iATL, an AIHA accredited laboratory, for microbiological analysis.

RESULTS

Mr. Greg Brownell of Tetra Tech, under the direction of Mr. Cody Knowlton of Tetra Tech, a Certified Mold Professional performed the site assessment and ambient air monitoring. Her Certified Mold Professional Certification is presented in Attachment A. Results of this assessment and ambient air monitoring is presented in the following sections.

Moisture Assessment and Visual Microbial Inspection Results

Tetra Tech’s overall visual inspection revealed areas of concern and Tetra Tech observed evidence of excessive moisture and mold in Rooms 101, 134, and 214.

Tape Lift Surface Sample Results

A summary of the tape lift surface sample results is provided in Table 1. A copy of the laboratory reports and COCs is contained in Attachment B.

Table 1. Summary of Tape Lift Surface Sample Results

Sample Number Location Mold Level Spore Type

742-061322-T1 Room 101, east ceiling Heavy Cladosporium species, spores hyphae

742-061322-T2 Room 214, east upper wall Heavy Cladosporium species, spores hyphae

742-061722-T3 Room 134, wall at cove base Heavy Alternaria species, spores hyphae

The detected spore types and concentrations present in the sample collected within the area assessed were not elevated in comparison to the background values. According to the Center for Disease Control (CDC) Guide for Sampling and Characterization of Bioaerosols, indoor air concentrations of microflora in a healthy work environment are typically lower than the outdoor concentrations at the same location (CDC, 2015). The total spore concentrations within the area assessed were below the guideline of 1,000 total spore counts recommended by The American Conference of Governmental Industrial Hygienists (ACGIH, 2017) for clean HVAC supplied buildings.

Bioaerosol Air Sample Results

A summary of the bioaerosol samples is provided in Table 2. A copy of the laboratory report and COC is contained in Attachment B.

Project No. NZAS 10-0007 Dormitory 742

Malmstrom Airforce Base Malmstrom AFB, Great Falls, Montana

3 October 29, 2024

Table 2. Summary of Bioaerosol Ambient Air Monitoring Results

Sample Number Location Spore Concentration (S/m3)

742-061322-M1 Outside 670

742-061322-M2 Room 103A 280

742-061322-M3 Room 204A 80

742-061322-M4 Room 317A 750

742-061322-M5 Room 323 370

742-061322-M6 Room 223 400

742-061322-M7 Room 129 350

S/m³ = Spores per cubic meter of air

Sample 742-061322-M1 was collected outside 20 feet from the building. This sample was collected as a background sample to help determine ambient levels of mold spores in the surrounding environment. The detected spore types and associated spore concentrations present in these outdoor air samples are considered within normal range with respect to mold spore concentrations in outdoor environments for this geographic region (OSHA, 2017). The detected spore types and concentrations present in the samples collected within the areas assessed were not elevated in comparison to the background values. According to the Center for Disease Control (CDC) Guide for Sampling and Characterization of Bioaerosols, indoor air concentrations of microflora in a healthy work environment are typically lower than the outdoor concentrations at the same location (CDC, 2015). The total spore concentrations within the areas assessed were below the guideline of 1,000 total spore counts recommended by The American Conference of Governmental Industrial Hygienists (ACGIH, 2017) for clean HVAC supplied buildings.

CONCLUSIONS AND RECOMMENDATIONS

Tetra Tech’s moisture and visual microbial investigation did not reveal any areas of concern of evidence of moisture or mold that could be expected to cause negative impact to IAQ.

LIMITATIONS

Our opinions are intended exclusively for use by Page IMEG Joint Venture, LLC and Malmstrom Airforce Base. The scope of services performed by Tetra Tech may not be appropriate to satisfy the needs of other users, and any use or re-use of this document, or the findings presented herein is prohibited and at the sole risk of the user. No additions or deletions are permitted without the express written consent of Tetra Tech. Furthermore, the opinions presented herein are limited by the requested scope of services and the site conditions existing at the time of our assessment. Therefore, our opinions and recommendations may not apply to future site conditions which we have not had the opportunity to evaluate.

The recommendations made in this report coincide with currently accepted industrial hygiene practices and represent the opinions of Tetra Tech at this time according to the conditions and current state of the art for accepted indoor air quality practices. This assessment did not include destructive sampling to check wall cavities or concealed areas for mold (i.e., cutting holes in walls, etc.). Other than this, no warranty is implied or intended.

Project No. NZAS 10-0007 Dormitory 742

Malmstrom Airforce Base Malmstrom AFB, Great Falls, Montana

4 October 29, 2024

It has been a pleasure assisting you with this project. If you have any questions or need additional information, please contact me in our Tetra Tech Billings, Montana office at (406) 248-9161.

Respectfully submitted, Tetra Tech, Inc.

Roger W. Herman, Jr.

Roger W. Herman, Jr.

Asbestos, Lead & IH Services Manager

Attachment A – Certified Mold Professional Certification Attachment B – Laboratory Analytical Reports and COCs I:\N-S\Page IMEG Joint Venture, LLC\117-743546-24001 - MAFB Dorms 735 742 HAZMAT\05-Deliverables\Final\Mold Inspection\Malmstrom Airforce Base Dorm 735- Microbial Inspection Report-FINAL.docx

1 October 29, 2024

ATTACHMENT A

Certified Mold Professional Certification

Certified Mold Professional Refresher

Cody Knowlton

September 13, 2022Course Completion Date:

Expiration Date: September 13, 2024

58260549

In recognition of satisfactory completion of a course of instruction entitled:

Danaya N. WilsonDanaya N. Wilson

This certificate is awarded to:

Credential License ID:

Certificate of Achievement

CHC Training Nationwide Training & Certification Experts www.chctraining.com 303.412.6360

855.60.CERTIFY

1775 W. 55th Avenue Denver, CO 80221

United States of America

InstructorCEO & Training Program Manager Aaron I. HixAaron I. Hix

In accordance with the "Guidelines on Assessment and Remediation of Fungi in Indoor Environments," of the New York City Department of Health and Mental Hygiene.

2 October 29, 2024

ATTACHMENT B

Laboratory Analytical Reports and COCs

Approved by:

Technical Manager Ariunaa Jalsrai

Report for:

Greg Brownell Tetra Tech - Billings, MT 7100 Commercial Ave, Suite 4 Billings, MT 59101

Regarding:

Eurofins EPK Built Environment Testing, LLC Project: 117- - MAFB Renovate Dorm 742

EML ID: 3686763

All samples were received in acceptable condition unless noted in the Report Comments portion in the body of the report. Due to the nature of the analyses performed, field blank correction of results is not applied. The results relate only to the samples as received and tested. Information supplied by the client which can affect the validity of results: sample air volume.

Eurofins EPK Built Environment Testing, LLC ("the Company"), a member of the Eurofins Built Environment Testing group of companies, shall have no liability to the client or the client's customer with respect to decisions or recommendations made, actions taken or courses of conduct implemented by either the client or the client's customer as a result of or based upon the Test Results.

In no event shall the Company be liable to the client with respect to the Test Results except for the Company's own willful misconduct or gross negligence nor shall the Company be liable for incidental or consequential damages or lost profits or revenues to the fullest extent such liability may be disclaimed by law, even if the Company has been advised of the possibility of such damages, lost profits or lost revenues. In no event shall the Company's liability with respect to the Test Results exceed the amount paid to the Company by the client therefor.

Dates of Analysis:

Spore trap analysis: 06-25-2024

Service SOPs: Spore trap analysis (EB-MY-S-1038) AIHA LAP, LLC accredited service, Lab ID #103005

Eurofins EPK Built Environment Testing, LLC's LabServe® reporting system includes automated fail-safes to ensure that all AIHA LAP, LLC quality requirements are met and notifications are added to reports when any quality steps remain pending.

EMLab ID: 3686763, Page 1 of 5Eurofins EPK Built Environment Testing, LLC

Eurofins EPK Built Environment Testing, LLC 3000 Lincoln Drive East, Suite A, Marlton, NJ 08053

(866) 871-1984 www.eurofinsus.com/Built Client: Tetra Tech - Billings, MT C/O: Greg Brownell Re: 117- - MAFB Renovate Dorm 742

Date of Receipt: 06-17-2024 Date of Report: 06-25-2024

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 742-061322-M1:

Outside 742-061322-M2:

103A Comments (see below) None None

Lab ID-Version‡: 18075671-1 18075672-1

Analysis Date: 06/25/2024 06/25/2024 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 1 100 7 Ascospores Basidiospores 14 25 370 7 25 190 Botrytis Chaetomium Cladosporium 11 25 290 3 25 80 Curvularia Epicoccum Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† Pithomyces Rusts Smuts, Periconia, Myxomycetes 2 100 13 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+) 2+ 2+ Hyphal fragments/m3 < 7 < 7 Pollen/m3 180 < 7 Skin cells (1-4+) < 1+ 2+ Sample volume (liters) 150 150 § TOTAL SPORES/m3 670 280 Comments:

EMLab ID: 3686763, Page 2 of 5Eurofins EPK Built Environment Testing, LLC

Spore types listed without a count or data entry were not detected during the course of the analysis for the respective sample, indicating a raw count of <1 spore.

† The spores of Aspergillus and Penicillium (and others such as Acremonium, Paecilomyces) are small and round with very few distinguishing characteristics. They cannot be differentiated by non-viable sampling methods. Also, some species with very small spores are easily missed, and may be undercounted.

††Background debris indicates the amount of non-biological particulate matter present on the trace (dust in the air) and the resulting visibility for the analyst. It is rated from 1+ (low) to 4+ (high). Counts from areas with 4+ background debris should be regarded as minimal counts and may be higher than reported. It is important to account for samples volumes when evaluating dust levels.

The analytical sensitivity is the spores/m^3 divided by the raw count, expressed in spores/m^3, per spore and per sample.

For more information regarding analytical sensitivity, please contact QA by calling the laboratory.

‡ A "Version" indicated by -"x" after the Lab ID# with a value greater than 1 indicates a sample with amended data. The revision number is reflected by the value of "x".

§ Total Spores/m3 has been rounded to two significant figures to reflect analytical precision.

(866) 871-1984 www.eurofinsus.com/Built Client: Tetra Tech - Billings, MT C/O: Greg Brownell Re: 117- - MAFB Renovate Dorm 742

Date of Receipt: 06-17-2024 Date of Report: 06-25-2024

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 742-061322-M3:

204A 742-061322-M4:

317A Comments (see below) None None

Lab ID-Version‡: 18075673-1 18075674-1

Analysis Date: 06/25/2024 06/25/2024 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 1 100 7 Ascospores Basidiospores 3 25 80 18 25 480 Botrytis Chaetomium Cladosporium 4 25 110 Curvularia Epicoccum Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† 3 25 80 Pithomyces Rusts Smuts, Periconia, Myxomycetes 12 100 80 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+) 2+ 3+ Hyphal fragments/m3 < 7 < 7 Pollen/m3 < 7 27 Skin cells (1-4+) 2+ 2+ Sample volume (liters) 150 150 § TOTAL SPORES/m3 80 750 Comments:

EMLab ID: 3686763, Page 3 of 5Eurofins EPK Built Environment Testing, LLC

Spore types listed without a count or data entry were not detected during the course of the analysis for the respective sample, indicating a raw count of <1 spore.

† The spores of Aspergillus and Penicillium (and others such as Acremonium, Paecilomyces) are small and round with very few distinguishing characteristics. They cannot be differentiated by non-viable sampling methods. Also, some species with very small spores are easily missed, and may be undercounted.

††Background debris indicates the amount of non-biological particulate matter present on the trace (dust in the air) and the resulting visibility for the analyst. It is rated from 1+ (low) to 4+ (high). Counts from areas with 4+ background debris should be regarded as minimal counts and may be higher than reported. It is important to account for samples volumes when evaluating dust levels.

The analytical sensitivity is the spores/m^3 divided by the raw count, expressed in spores/m^3, per spore and per sample.

For more information regarding analytical sensitivity, please contact QA by calling the laboratory.

‡ A "Version" indicated by -"x" after the Lab ID# with a value greater than 1 indicates a sample with amended data. The revision number is

(866) 871-1984 www.eurofinsus.com/Built Client: Tetra Tech - Billings, MT C/O: Greg Brownell Re: 117- - MAFB Renovate Dorm 742

Date of Receipt: 06-17-2024 Date of Report: 06-25-2024

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 742-061322-M5:

742-061322-M6:

Comments (see below) None None

Lab ID-Version‡: 18075675-1 18075676-1

Analysis Date: 06/25/2024 06/25/2024 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria Ascospores Basidiospores 8 25 210 5 25 130 Botrytis Chaetomium Cladosporium 5 25 130 Curvularia Epicoccum Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† 10 25 270 Pithomyces Rusts Smuts, Periconia, Myxomycetes 4 100 27 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+) 2+ 2+ Hyphal fragments/m3 < 7 < 7 Pollen/m3 20 < 7 Skin cells (1-4+) 2+ 2+ Sample volume (liters) 150 150 § TOTAL SPORES/m3 370 400 Comments:

EMLab ID: 3686763, Page 4 of 5Eurofins EPK Built Environment Testing, LLC

Spore types listed without a count or data entry were not detected during the course of the analysis for the respective sample, indicating a raw count of <1 spore.

† The spores of Aspergillus and Penicillium (and others such as Acremonium, Paecilomyces) are small and round with very few distinguishing characteristics. They cannot be differentiated by non-viable sampling methods. Also, some species with very small spores are easily missed, and may be undercounted.

††Background debris indicates the amount of non-biological particulate matter present on the trace (dust in the air) and the resulting visibility for the analyst. It is rated from 1+ (low) to 4+ (high). Counts from areas with 4+ background debris should be regarded as minimal counts and may be higher than reported. It is important to account for samples volumes when evaluating dust levels.

The analytical sensitivity is the spores/m^3 divided by the raw count, expressed in spores/m^3, per spore and per sample.

For more information regarding analytical sensitivity, please contact QA by calling the laboratory.

‡ A "Version" indicated by -"x" after the Lab ID# with a value greater than 1 indicates a sample with amended data. The revision number is

(866) 871-1984 www.eurofinsus.com/Built Client: Tetra Tech - Billings, MT C/O: Greg Brownell Re: 117- - MAFB Renovate Dorm 742

Date of Receipt: 06-17-2024 Date of Report: 06-25-2024

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 742-061322-M7:

Comments (see below) None

Lab ID-Version‡: 18075677-1

Analysis Date: 06/25/2024 raw ct. % read spores/m3 Alternaria Ascospores Basidiospores 11 25 290 Botrytis Chaetomium Cladosporium 2 25 53 Curvularia Epicoccum Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† Pithomyces Rusts Smuts, Periconia, Myxomycetes Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+) 2+ Hyphal fragments/m3 < 7 Pollen/m3 < 7 Skin cells (1-4+) 2+ Sample volume (liters) 150 § TOTAL SPORES/m3 350 Comments:

EMLab ID: 3686763, Page 5 of 5Eurofins EPK Built Environment Testing, LLC

Spore types listed without a count or data entry were not detected during the course of the analysis for the respective sample, indicating a raw count of <1 spore.

† The spores of Aspergillus and Penicillium (and others such as Acremonium, Paecilomyces) are small and round with very few distinguishing characteristics. They cannot be differentiated by non-viable sampling methods. Also, some species with very small spores are easily missed, and may be undercounted.

††Background debris indicates the amount of non-biological particulate matter present on the trace (dust in the air) and the resulting visibility for the analyst. It is rated from 1+ (low) to 4+ (high). Counts from areas with 4+ background debris should be regarded as minimal counts and may be higher than reported. It is important to account for samples volumes when evaluating dust levels.

The analytical sensitivity is the spores/m^3 divided by the raw count, expressed in spores/m^3, per spore and per sample.

For more information regarding analytical sensitivity, please contact QA by calling the laboratory.

‡ A "Version" indicated by -"x" after the Lab ID# with a value greater than 1 indicates a sample with amended data. The revision number is

Ariunaa Jalsrai

Report for:

Greg Brownell Tetra Tech - Billings, MT 7100 Commercial Ave, Suite 4 Billings, MT 59101

Regarding:

Eurofins EPK Built Environment Testing, LLC Project: 117- - MAFB Renovate Dorm 742

EML ID: 3686763

All samples were received in acceptable condition unless noted in the Report Comments portion in the body of the report. Due to the nature of the analyses performed, field blank correction of results is not applied. The results relate only to the samples as received and tested.

Eurofins EPK Built Environment Testing, LLC ("the Company"), a member of the Eurofins Built Environment Testing group of companies, shall have no liability to the client or the client's customer with respect to decisions or recommendations made, actions taken or courses of conduct implemented by either the client or the client's customer as a result of or based upon the Test Results.

In no event shall the Company be liable to the client with respect to the Test Results except for the Company's own willful misconduct or gross negligence nor shall the Company be liable for incidental or consequential damages or lost profits or revenues to the fullest extent such liability may be disclaimed by law, even if the Company has been advised of the possibility of such damages, lost profits or lost revenues. In no event shall the Company's liability with respect to the Test Results exceed the amount paid to the Company by the client therefor.

Dates of Analysis:

Direct microscopic exam (Qualitative): 06-25-2024

Service SOPs: Direct microscopic exam (Qualitative) (EM-MY-S-1039) AIHA LAP, LLC accredited service, Lab ID #103005

Eurofins EPK Built Environment Testing, LLC's LabServe® reporting system includes automated fail-safes to ensure that all AIHA LAP, LLC quality requirements are met and notifications are added to reports when any quality steps remain pending.

EMLab ID: 3686763, Page 1 of 2Eurofins EPK Built Environment Testing, LLC

(866) 871-1984 www.eurofinsus.com/Built Client: Tetra Tech - Billings, MT C/O: Greg Brownell Re: 117- - MAFB Renovate Dorm 742

Date of Receipt: 06-17-2024 Date of Report: 06-25-2024

DIRECT MICROSCOPIC EXAMINATION REPORT

Background

Debris and/or Description

Miscellaneous Spores Present*

MOLD GROWTH: Molds seen with underlying mycelial and/or sporulating structures†

Other Comments††

General Impression

Lab ID-Version‡: 18081964-1, Analysis Date: 06/25/2024: Tape sample 742-061322-T1: 101E/Ceiling

Heavy None 3+ Cladosporium species (spores, hyphae)

None Mold growth

Lab ID-Version: 18081965-1, Analysis Date: 06/25/2024: Tape sample 742-061322-T2: 214E/Upper Wall

Heavy None 3+ Cladosporium species (spores, hyphae)

None Mold growth

* Indicative of normal conditions, i.e. seen on surfaces everywhere. Includes basidiospores (mushroom spores), myxomycetes, plant pathogens such as ascospores, rusts and smuts, and a mix of saprophytic genera with no particular spore type predominating. Distribution of spore types seen mirrors that usually seen outdoors.

† Quantities of molds seen growing are listed in the MOLD GROWTH column and are graded <1+ to 4+, with 4+ denoting the highest numbers.

†† Some comments may refer to the following: Most surfaces collect a mix of spores which are normally present in the outdoor environment. At times it is possible to note a skewing of the distribution of spore types, and also to note "marker" genera which may indicate indoor mold growth. Marker genera are those spore types which are present normally in very small numbers, but which multiply indoors when conditions are favorable for growth.

‡ A "Version" indicated by -"x" after the Lab ID# with a value greater than 1 indicates a sample with amended data. The revision number is reflected by the value of "x".

The limit of detection is < 1+ when mold growth is detected.

For additional information necessary for the interpretation of the results, all readers are advised to refer to the document "Direct Exam Details Page" which is available on our website at:

www.emlab.com/services/mold-testing/direct-microscopic-exam-qualitative/

EMLab ID: 3686763, Page 2 of 2Eurofins EPK Built Environment Testing, LLC

Ariunaa Jalsrai

Report for:

Roger Herman Tetra Tech - Billings, MT 7100 Commercial Ave, Suite 4 Billings, MT 59101

Regarding:

Eurofins EPK Built Environment Testing, LLC Project: 117- - MAFB Renovate Dorm 742

EML ID: 3683581

All samples were received in acceptable condition unless noted in the Report Comments portion in the body of the report. Due to the nature of the analyses performed, field blank correction of results is not applied. The results relate only to the samples as received and tested.

Eurofins EPK Built Environment Testing, LLC ("the Company"), a member of the Eurofins Built Environment Testing group of companies, shall have no liability to the client or the client's customer with respect to decisions or recommendations made, actions taken or courses of conduct implemented by either the client or the client's customer as a result of or based upon the Test Results.

In no event shall the Company be liable to the client with respect to the Test Results except for the Company's own willful misconduct or gross negligence nor shall the Company be liable for incidental or consequential damages or lost profits or revenues to the fullest extent such liability may be disclaimed by law, even if the Company has been advised of the possibility of such damages, lost profits or lost revenues. In no event shall the Company's liability with respect to the Test Results exceed the amount paid to the Company by the client therefor.

Dates of Analysis:

Direct microscopic exam (Qualitative): 06-25-2024

Service SOPs: Direct microscopic exam (Qualitative) (EM-MY-S-1039) AIHA LAP, LLC accredited service, Lab ID #103005

Eurofins EPK Built Environment Testing, LLC's LabServe® reporting system includes automated fail-safes to ensure that all AIHA LAP, LLC quality requirements are met and notifications are added to reports when any quality steps remain pending.

EMLab ID: 3683581, Page 1 of 3Eurofins EPK Built Environment Testing, LLC

(866) 871-1984 www.eurofinsus.com/Built Client: Tetra Tech - Billings, MT C/O: Roger Herman Re: 117- - MAFB Renovate Dorm 742

Date of Receipt: 06-20-2024 Date of Report: 06-25-2024

DIRECT MICROSCOPIC EXAMINATION REPORT

Background

Debris and/or Description

Miscellaneous Spores Present*

MOLD GROWTH: Molds seen with underlying mycelial and/or sporulating structures†

Other Comments††

General Impression

Lab ID-Version‡: 18082372-1, Analysis Date: 06/25/2024: Tape sample 742-061724-T3: 134/Wall at Cove Base

Heavy None 4+ Alternaria species (spores, hyphae)

None Mold growth

* Indicative of normal conditions, i.e. seen on surfaces everywhere. Includes basidiospores (mushroom spores), myxomycetes, plant pathogens such as ascospores, rusts and smuts, and a mix of saprophytic genera with no particular spore type predominating. Distribution of spore types seen mirrors that usually seen outdoors.

† Quantities of molds seen growing are listed in the MOLD GROWTH column and are graded <1+ to 4+, with 4+ denoting the highest numbers.

†† Some comments may refer to the following: Most surfaces collect a mix of spores which are normally present in the outdoor environment. At times it is possible to note a skewing of the distribution of spore types, and also to note "marker" genera which may indicate indoor mold growth. Marker genera are those spore types which are present normally in very small numbers, but which multiply indoors when conditions are favorable for growth.

‡ A "Version" indicated by -"x" after the Lab ID# with a value greater than 1 indicates a sample with amended data. The revision number is reflected by the value of "x".

The limit of detection is < 1+ when mold growth is detected.

For additional information necessary for the interpretation of the results, all readers are advised to refer to the document "Direct Exam Details Page" which is available on our website at:

www.emlab.com/services/mold-testing/direct-microscopic-exam-qualitative/

EMLab ID: 3683581, Page 2 of 3Eurofins EPK Built Environment Testing, LLC

(866) 871-1984 www.eurofinsus.com/Built Client: Tetra Tech - Billings, MT C/O: Roger Herman Re: 117- - MAFB Renovate Dorm 742

Date of Receipt: 06-20-2024 Date of Report: 06-25-2024

DIRECT MICROSCOPIC EXAMINATION REPORT

PROJECT ANALYST AND SIGNATORY REPORT

Project Analyst

The test report shall not be reproduced except in full, without written approval of the laboratory. The report must not be used by the client to claim product certification, approval, or endorsement by AIHA LAP, LLC, or any agency of the federal government. The Company reserves the right to dispose of all samples after a period of thirty (30) days, according to all state and federal guidelines, unless otherwise specified.

‡ A "Version" indicated by -"x" after the Lab ID# with a value greater than 1 indicates a sample with amended data. The revision number is reflected by the value of "x".

Analyst: Benjamin Reich

EMLab ID: 3683581, Page 3 of 3Eurofins EPK Built Environment Testing, LLC