Terracon_USACE Coralville_Mold_Moisture Investigation Report_8.2.22.pdf

Moisture and Microbial Investigation Report

USACE Coralville Reservoir Administrative Building

2850 Prairie Du Chien Road NE

Iowa City, Iowa 52240

August 23, 2022

Terracon Project No. 06227092

Prepared for:

Greenstone Construction, Ince

Fargo, North Dakota

Prepared by:

Terracon Consultants, Inc.

Cedar Rapids, Iowa http://terranet.terracon.com/dept/marketing/PublishingImages/brandingbar.jpg

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TABLE OF CONTENTS

1.0 PROJECT DESCRIPTION

1.1 Scope of Services

1.2 Standard of Care

2.0 MICROBIAL INVESTIGATION CRITERIA AND METHODS

2.1 Physical Inspection

2.2 Moisture Content in Building Materials

2.2.1 Infrared Camera

2.2.2 Moisture Meter Measurements

2.3 Temperature and Relative Humidity Monitoring

2.4 Microbial Sampling

3.0 FINDINGS

3.1 Physical Inspection

3.2 Moisture Content in Building Materials

3.3 Temperature and Relative Humidity Measurements

3.4 Mold Spore Trap Sample Results

4.0 CONCLUSIONS

5.0 RECOMMENDATIONS

APPENDICES

APPENDIX A Exhibits

Exhibit 1 – 1st Floor Moisture and Spore Trap Sample Diagram Exhibit 2 – Basement Moisture and Spore Trap Sample Diagram Exhibit 3 – Moisture-Impacted Drywall and Carpet Location Diagram

APPENDIX B Mold Sampling Worksheets Pump Calibration Data

APPENDIX C Analytical Laboratory Report and COC

APPENDIX D Photographic Documentation

Mold and Moisture Investigation Report USACE Admin Building ■ Iowa City, Iowa August 23, 2022 ■ Terracon Project No. 06227092

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Moisture and Microbial Investigation Report

USACE Coralville Reservoir Administrative Building

Iowa City, Iowa

Terracon Project No. 06227092

August 23, 2022

1.0 PROJECT DESCRIPTION

We understand that Greenstone has been retained by the USACE to replace the roof on the building. Terracon understands that during the roofing replacement, water infiltrated into the building during a storm event during the month of June. It is believed that water infiltrated through poly sheeting that was placed above the ceiling during the roof replacement. It is also believed the potential historical water infiltration has occurred in portions of the original portion of the building. At this time, we understand that building materials (i.e., ceilings, drywall, fiberglass bat insulation carpeting, wood flooring, etc.) were impacted and that Greenstone retained ServPro to provide moisture remedial services in the building.

Terracon performed two moisture and microbial investigations in the Admin Building on June

2, 2022 and June 21, 2022 to address moisture infiltration that occurred during a storm event that occurred earlier in the year. Please refer to Terracon’s Moisture and Microbial

Investigation Report dated June 10, 2022 and Terracon’s Moisture, Microbial, and Asbestos

Survey Report dated July 8, 2022 for the findings of that initial and supplemental investigations. We further understand that the USACE has requested these services (from

Greenstone) in order to determine locations of potential microbial growth and to determine the location of moisture-effected building materials.

On August 10, 2022, Terracon conducted a moisture and microbial investigation at the Admin

Building in Iowa City, Iowa. Terracon representatives, Ms. Taryn Rowley and Mr. Nick Fritz, performed the investigation. Mr. Jeremiah Morse of Greenstone Construction, Inc.

(Greenstone) was present during the assessment and provided information to Terracon for these services. The investigation was conducted in accordance with Terracon’s Supplemental

Change Order dated July 29, 2022.

1.1 Scope of Services

Our services included the following:

◼ Physical inspection of the interior of the project area to determine potential moisture intrusion locations and to identify areas of potential microbial growth;

◼ Measurements of air temperature and relative humidity;

Moisture and Microbial Investigation Report

◼ Determination of moisture content in accessible building materials based on the physical inspection;

◼ Mold spore trap air testing;

◼ Tape lift samples for mold; and

◼ Preparation of this report.

1.2 Standard of Care

This investigation was conducted on August 10, 2022, based on information provided to

Terracon, by Greenstone. Terracon did not attempt to identify every potential exposure, moisture location, or hazard present in the subject building.

This investigation was conducted in a manner consistent with the level of care and skill ordinarily exercised by members of the profession currently practicing under similar conditions in the same locale. The results, findings, conclusions, and recommendations expressed in this report are based on conditions observed during our investigation. Many factors, such as weather conditions, building occupancy, ventilation patterns, and seasonal variations in fungal concentrations, can affect the conditions observed. The information contained in this report should not be relied upon to represent conditions that existed prior to or after this investigation.

Terracon does not warrant the services of regulatory agencies, laboratories, or other third parties supplying information that may have been used in the preparation of this report.

2.0 MICROBIAL INVESTIGATION CRITERIA AND METHODS

2.1 Physical Inspection

The physical inspection was conducted to evaluate general indoor hygiene, building maintenance practices, areas of moisture intrusion, uncontrolled condensate formation, odors, and the presence of visible fungal growth, if present. The inspection focused primarily on collecting observational data (i.e., information obtained by physical inspection of the building and interviews with the building management, owners, and occupants).

The physical inspection included:

◼ An examination of the physical structure and potential point sources of moisture intrusion;

◼ Inspection of the heating, ventilating, and air-conditioning (HVAC) system(s) and components servicing the affected areas, if readily accessible, ◼ The identification of any discoloration or odor that could indicate moisture intrusion, water damage and microbial growth;

◼ Using a moisture meter and infrared (IR) imaging camera to detect moisture impacted materials;

2.2 Moisture Content in Building Materials

Excess moisture in building materials may result in the growth of fungi or bacteria. There are no regulations or standards for moisture content in installed building materials. Moisture content will vary building-to-building and across geography, depending largely on relative humidity and indoor environmental conditions. Terracon applied industry best practices and equipment manufacturer guidelines to determine the moisture content of materials in the project area.

A moisture meter and IR camera were used to identify suspect water-impacted materials in the project area. Building materials have different absorptive and moisture retention properties and will come into equilibrium with environmental moisture (as indicated by relative humidity levels) or become wet by contact with water.

Our investigation was limited to accessible surfaces in the project area. Terracon did not perform intrusive investigation to inspect interior wall cavity spaces in the building. During the assessment, our observations were also limited by stored materials/office supplies/furniture;

those materials were not moved during the investigation. Terracon did not attempt to identify all potential sources of moisture intrusion.

2.2.1 Infrared Camera

Some moisture-impacted materials, such as those inside wall cavities or interstitial spaces, or materials that show no visible signs of impact may not be detected by a physical inspection or by using a moisture meter. Terracon utilized a FLIR C2 infrared (IR) camera (S/N

720061560) to scan the project area to identify potential areas of moisture intrusion. Infrared imaging allows the user to visualize temperature gradients in building materials, and moist areas are typically cooler than adjacent dry areas as a result of evaporative cooling. Materials identified using the IR camera were confirmed with a moisture meter, as discussed below.

Photographs of select IR camera images are provided in Appendix D.

2.2.2 Moisture Meter Measurements

Following the visual inspection and utilization of the IR camera, Terracon used a GE Protimeter

Surveymaster™ moisture meter to assess suspect areas of moisture intrusion. A calibration check was conducted onsite prior to the assessment. This instrument has two modes of operation:

◼ Search mode is used to measure relative moisture beneath the surface of materials by means of radio frequency, and

◼ Measure mode uses electrical conductivity to measure the moisture level of building materials between two electrodes. The moisture level value is reported as percent wood moisture equivalent (%WME).

The search mode was utilized at the base of walls and carpets to locate large areas of moisture and then the measure mode was utilized for defining areas of apparent moisture.

The locations of the moisture meter readings are shown in Exhibits 1 and 2 in Appendix A.

Photographs of select moisture meter readings are provided in Appendix D.

2.3 Temperature and Relative Humidity Monitoring

Indoor air temperature and relative humidity are physical conditions important to the perception of comfort. American Society of Heating, Refrigerating, and Air-Conditioning

Engineers (ASHRAE) Standard 55-2017 Thermal Environmental Conditions for Human

Occupancy identifies six primary factors that affect comfort: metabolic rate (affected by the activity being conducted), clothing insulation, air temperature, radiant temperature, air speed, and humidity. The relationships are complex, but to summarize, a temperature range between

68- and 79-degrees Fahrenheit (F) with relative humidity below 60 percent (%) is recommended for persons working at sedentary to moderately elevated physical activity levels. To avoid conditions sufficiently moist to promote the growth of molds or other bio growth, relative humidity should not exceed 60%.

Terracon measured temperature and relative humidity (RH) using an EXTECH Instruments

Humidity/Temperature Pen (S/N 445580), an electronic monitoring instrument. The instrument provides direct-reading measurements of temperature within the range of 14 to 122 degrees

Fahrenheit (F) and RH within the range of 10% to 90%. Measurements were conducted in the ambient environment outside the building and in various areas of the building interior during the site walkthrough.

2.4 Microbial Sampling

No state or federal exposure limits have been established for fungal aerosols, and regulatory standards or medically based threshold limit or dose-response relationships do not currently exist for exposure to airborne or surface concentrations of mold spores. Terracon relies upon experience, professional judgment, current scientific literature, guidelines, and recommendations made by professional organizations and experts, and statistical methods in interpreting mold sampling results.

High variability in airborne fungal spore concentrations can exist in different geographic locations, during different seasons, and weather patterns, and over the course of a given day.

Generally, indoor air fungal spore concentrations in an HVAC-supplied building are typically less than, but qualitatively similar to, fungal spore concentrations found in the outside environment. To help interpret the sampling results, we compared indoor air and outdoor air measurements.

Terracon collected fungal spore trap samples using Air-O-Cell® sampling cassettes and Zefon

Bio-Pump® Plus Model ZDP-200 (S/N 3974) at a flow rate of 15 liters per minute for 5 minutes per sample. As shown on Exhibits 1 and 2 in Appendix A, spore trap samples were collected at representative indoor and outdoor sample locations including:

Exterior:

◼ 10 feet southeast of eastern building entrance to Reception 125

◼ 5 feet east of exterior door to lunchroom B04

1st Floor:

◼ Display Room (118), 6 feet north of southern wall, middle of room from east to west

◼ Display Room (118), 5 feet south of northern wall, middle of room from east to west

◼ Office 123, middle of room

◼ Theatre Room (116), middle of room

◼ Reception (125), middle of room

◼ Squad Room (114), middle of room

◼ Office 102, middle of room

◼ Office 107, middle of room

◼ Office 110, middle of room

Basement:

◼ Conference Room (B02), middle of room

◼ Lunchroom (B04), middle of room

After the mold sample collection, the sample cassettes and tape lift samples were shipped under chain-of-custody (COC) to Eurofins EMLab P&K (EMLab), Marlton, New Jersey.

EMLab is accredited by the AIHA® Laboratory Accreditation Programs, LLC under the

Environmental Microbiology Laboratory Accreditation Program (EMLAP). Copies of the sampling worksheets, pump calibration data, are provided in Appendix B.

3.0 FINDINGS

This section includes the findings and a discussion of our physical inspection and sampling results. Appendix D includes photos of notable features and/or findings associated with this inspection.

3.1 Physical Inspection

Table 1 contains an overview of findings from the physical inspection. Significant findings are discussed in the section that follows.

Table 1. Physical Inspection Findings

Inspection Parameter Observation Comments

Type of Occupancy Administrative Building

Type of Enclosure Brick and concrete masonry unit block walls

Types of Finishes

◼ Walls ◼ Ceilings ◼ Floors ◼ Exterior

◼ Drywall ◼ Plaster or acoustical ceiling tile ◼ Carpet or vinyl floor tile ◼ Brick

Discoloration/Water Staining Apparent water staining was observed on the ceiling tiles in the following rooms:

◼ Squad Room (114) ◼ Storage Room (115) ◼ Theatre (116) ◼ Reception (125) ◼ Display Room (118) ◼ Office 123 ◼ Lunchroom (B04)

Water staining was also apparent on the spray-applied textured ceiling in office 123, Display Room (118), Men’s Restroom 120, and

Women’s Restroom 119.

Prior to Terracon’s arrival on site, select water-damaged ceiling tiles were removed throughout the building by Greenstone Construction immediately following the water intrusion event.

Following our discussion with onsite representatives, Terracon performed a physical inspection of the interior of the structure. Our observations were limited to accessible spaces.

Terracon did not perform an intrusive investigation in the building. Terracon did not attempt to move office furniture during the investigation.

Based on our observations, a moldy-musty odor was not readily apparent in the building.

Normal and good housekeeping efforts in the building were observed. However, several mop buckets were observed in Office 123 during Terracon’s physical inspection. Terracon did observe suspect visible biogrowth on the vents in Office 109, Women’s Restrooms 111 and

119. Other stored materials (papers, office equipment, etc.) did not appear to be impacted by mold or moisture. Water staining was observed on ceilings in several locations in the building;

it is suspected that the staining may be attributed to historical events. Please refer to Section

3.2 for findings of the moisture evaluation.

3.2 Moisture Content in Building Materials

Terracon utilized an IR camera to observe various areas of the interior of the project area

(rooms to the east of the entryway on the first floor of the building and in various rooms in the basement). Terracon used a moisture meter on areas where the IR camera showed temperature variations in building materials. Brick and concrete may not retain moisture like wood or sheetrock and IR imaging and moisture meter measurements may not adequately detect moisture in these materials. Additionally, other walls, ceilings, and carpets (generally the rooms to the south of Theatre 116) were scanned with the camera, but the results are not reported in the table below due to no significant returns. A summary of the moisture meter readings is provided in Table 2 below. The locations of the moisture content readings are presented in Exhibits 1 and 2 in Appendix A; locations of apparent moisture impacted drywall and carpeting are depicted on Exhibit 3 in Appendix A.

Table 2. Moisture Level Results

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-1

Office 107

Middle of north wall

Drywall 4” 12.6 Dry

M-2 Just west of door on east wall

Drywall 4” 12.7 Dry

M-3 Northwest corner, west wall

Drywall 4” 11.6 Dry

M-4 Middle of east wall

Drywall 4” 10.2 Dry

M-5 Southeast corner of south wall

Drywall 4” 8.6 Dry

M-6 Northeast corner

Carpet Ground 8.7 Dry

M-7 Northwest corner

Carpet Ground 6.2 Dry

M-8 Southwest corner

Carpet Ground 11.3 Dry

Drywall Ceiling 10.1 Dry

M-9

Office 106

Middle of south wall

Drywall 4” 8.2 Dry

M-10 Middle of east wall

Drywall 4” 9.6 Dry

M-11 Middle of north wall

Drywall 4” 10.3 Dry

M-12 Middle of west wall

Drywall 4” 11.2 Dry

1 WME = wood moisture equivalent; the theoretical moisture concentration value that would be attained by a piece of wood in moisture equilibrium with the material under investigation at the point of measurement.

2 Interpretations based on FEMA’s Initial Restoration for Flooded Buildings Hurricane Katrina Recovery Advisory guidance document dated November 2005.

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-13 Southeast corner

Carpet Ground 8.7 Dry

M-14 Northwest corner

Carpet Ground 10.6 Dry

M-15 Northeast corner

Carpet Ground 12.2 Dry

M-16 Southeast corner of ceiling

Drywall Ceiling 8.6 Dry

M-17 Middle of ceiling

Drywall Ceiling 9.2 Dry

M-18

Office 108

Southwest corner, west wall

Drywall 4” 8.2 Dry

M-19 Southwest corner, south wall

Drywall 4” 9.6 Dry

M-20 Middle of east wall

Drywall 4” 12.2 Dry

M-21 Office 109 Southeast corner of room

Carpet Ground 10.2 Dry

M-22

Office 110

Right side of southwest window

Drywall 4’ 14.4 Dry

M-23 Left side of southwest window

Drywall 4’ 14.2 Dry

M-24

Office 105

Northeast corner

Carpet Ground 8.8 Dry

M-25 Southeast corner

Carpet Ground 8.9 Dry

M-26

Restroom

West of skylight frame, ceiling

Drywall Ceiling 10.2 Dry

M-27 East of skylight frame, ceiling

Drywall Ceiling 10.0 Dry

M-28 Restroom

West of skylight frame, ceiling

Drywall Ceiling 8.8 Dry

M-29 Office 103 Northeast corner

Drywall 4” 8.2 Dry

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-30 East wall, northeast corner

Drywall 4” 10.6 Dry

M-31

Office 102

Just west of south door

Drywall 4” 10.2 Dry

M-32 Middle of south wall

Drywall 4” 8.2 Dry

M-33 Southwest corner, west wall

Drywall 4” 9.6 Dry

M-34 Middle of west wall

Drywall 4” 10.2 Dry

M-35 Northwest corner, west wall

Drywall 4” 11.3 Dry

M-36

Lunchroom B04

Just under northeast window on east wall

Drywall 4” 9.2 Dry

M-37

Just under southeast window on east wall

Drywall 4” 10.3 Dry

M-38

Just under middle of windows on east wall

Drywall 4” 11.2 Dry

M-39 Northeast corner of ceiling

Ceiling Tile

12’ 8.3 Dry

M-40

Squad Room 114

Southeast corner, south wall

Drywall

4” 15.6 Partially dry – caution

7’ 16.2 Partially dry – caution

M-41 Middle of south wall

Drywall

4” 14.8 Dry

7’ 15.6 Partially dry – caution

7.5’ 13.2 Dry

M-42 Southwest corner, south wall

Drywall

4” 15.2 Dry

7’ 15.5 Partially dry – caution

M-43 Middle of west wall

Drywall 4” 12.2 Dry

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-44 Under middle window on north wall

Drywall 7’ 10.2 Dry

M-45

Above cabinet on north wall, middle

Drywall 3’ 7.6 Dry

M-46 Northeast corner, east wall

Drywall

4” 15.2 Dry

10’ 16.3 Partially dry – caution

M-47 Middle of east wall

Drywall

4” 21.2 Wet

8” 18.2 Partially dry – caution

7’ 16.3 Partially dry – caution

10’ 15.5 Partially dry – caution

M-48 Just north of jut-out on east wall

Drywall

4” 16.2 Partially dry – caution

10’ 15.8 Partially dry – caution

M-49 Just north of door on east wall

Drywall

4’ 18.3 Partially dry – caution

10’ 16.1 Partially dry – caution

M-50 Northeast corner, north wall

Drywall

11’ 14.8 Dry

4” 15.2 Partially dry – caution

M-51 South edge of jut-out on east wall

Drywall

4” 20.2 Wet

8” 16.3 Partially dry – caution

M-52

Reception

Under window on east wall, south edge

Drywall

4” 15.2 Partially dry – caution

3’ 16.1 Partially dry – caution

M-53

Under window on east wall, middle of wall

Drywall

4” 21.2 Wet

8” 22.3 Wet

3’ 16.8 Partially dry – caution

M-54 North edge of east window

Drywall 4” 17.8

Partially dry – caution

3’ 37.8 Wet

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-55 Along north edge of east window

Drywall 4” 15.6

Partially dry – caution

10’ 16.2 Partially dry – caution

11’ 14.3 Partially dry – caution

M-56 Northeast corner, north wall

Drywall 6’ 16.3

Partially dry – caution

7’ 15.7 Partially dry – caution

8’ 13.2 Dry

M-57 Just west of north door

Drywall

4” 15.6 Partially dry – caution

7’ 16.2 Partially dry – caution

8’ 13.6 Dry

M-58 Northwest corner, north wall

Drywall

4” 15.6 Partially dry – caution

7’ 16.3 Partially dry – caution

M-59

Hallway south of

Reception

Northeast corner, north wall

Drywall 4” 12.3 Dry

M-60 Southeast corner, south wall

Drywall 4” 11.6 Dry

M-61 Just east of jut-out on south wall

Drywall

4” 20.6 Wet

8” 14.2 Dry

M-62 2 feet east of jut-out on south wall

Drywall 4” 10.4 Dry

M-63 On jut-out on south wall

Drywall 4” 13.2 Dry

M-64

Theatre room 116

Northeast corner, west of door

Carpet Ground 8.7 Dry

M-65 Northwest corner

Carpet Ground 10.2 Dry

M-66 Middle of east wall

Carpet Ground 13.3 Dry

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-67

2 feet west of eastern door to reception hallway

Carpet Ground 24.9 Wet

M-68

2 feet southwest of eastern door to reception hallway

Carpet Ground 36.3 Wet

M-69

5 feet northeast of southwest corner

Carpet Ground 20.4 Wet

M-70 Janitor’s

Room 122 Middle of east wall

Drywall 4” 10.2 Dry

3.3 Temperature and Relative Humidity Measurements

The National Weather Service Forecast Office website3 for the Iowa City, Iowa, station indicated the following weather conditions on August 10, 2022: high temperature of 82F, an average of 70F; clear skies; an average wind speed of 2.6 miles per hour from the southwest;

and a relative humidity average of 63%.

Temperature and relative humidity readings were collected at the indoor and outdoor spore trap sampling locations. The readings were within the ranges ASHRAE considers optimal for summer operating conditions. A summary of indoor temperature and humidity levels obtained during this assessment is provided in Table 3 below.

Table 3. Temperature and Relative Humidity Levels

Location Temperature Relative Humidity

10 feet southeast of eastern building entrance to

Reception 125 82.5°F 65.3%

Display Room (118), 6 feet north of southern wall, middle of room from east to west 79.5°F 44.8%

Display Room (118), 5 feet south of northern wall, middle of room from east to west 74.8°F 51.7%

Office 123, middle of room 71.4°F 49.8%

3 Posted at: https://w2.weather.gov/climate/index.php?wfo=dvn; accessed August 11, 2022.

https://w2.weather.gov/climate/index.php?wfo=dvn

Location Temperature Relative Humidity

Theatre Room 116, middle of room 72.3°F 57.8%

Reception (125), middle of room 72.6°F 58.1%

Squad Room (114), middle of room 73.4°F 58.4%

Office 102, middle of room 71.7°F 48.1%

Office 107, middle of room 71.4°F 47.4%

Office 110, middle of room 73.0°F 44.3%

Conference Room B02, middle of room 71.9°F 47.5%

Lunchroom B04, middle of room 71.4°F 48.9%

5 feet east of exterior door to lunchroom B04 74.4°F 58.8%

3.4 Mold Spore Trap Sample Results

Terracon collected spore trap samples at 11 locations inside the building and 2 locations outside of the building. Table 4 summarizes the results of the spore trap sampling. The results are reported in spores per cubic meter (spores/m3).

Table 4. Spore Trap Sampling Results

Laboratory

Sample ID #

Terracon

Sample

ID Sample Location

Total

Concentration

(spores/m3)

Mold Spore Types and

Concentrations (spores/m3)

3404 3780 E1 10 feet southeast of eastern building entrance to

Reception 125

30,000 Alternaria (1,800)

Ascospores (1,000)

Basidiospores (7,700)

Cercospora (150)

Choanephora (240)

Cladosporium (18,000)

Curvularia (40)

Epicoccum (110)

Fusarium (13)

Ganoderma (160)

Nigrospora (53)

Other brown (40)

Penicillium/Aspergillus types

(370)

Pithomyces (400)

Polythrincium (160)

Rusts (27)

Smuts, Periconia, Myxomycetes

(53)

Laboratory

Sample ID #

Terracon

Sample

ID Sample Location

Total

Concentration

(spores/m3)

Mold Spore Types and

Concentrations (spores/m3)

3404 3775 I1 Display Room

(118), 6 feet north of southern wall, middle of room from east to west

720 Alternaria (13)

Ascospores (110)

Basidiospores (590)

3404 3800 I2 Display Room

(118), 5 feet south of northern wall, middle of room from east to west

650 Ascospores (110)

Basidiospores (53)

Cladosporium (430)

Epicoccum (13)

Pithomyces (53)

3404 3919 I3 Office 123, middle of room

1,000 Ascospores (53)

Basidiospores (750)

Cladosporium (160)

Epicoccum (13)

Penicillium/Aspergillus types (53)

Rusts (13)

3404 3702 I4 Theatre Room 116, middle of room

1,300 Alternaria (27)

Ascospores (210)

Basidiospores (1,000)

Nigrospora (27)

3404 3811 I5 Reception (125), middle of room

2,600 Alternaria (13)

Ascospores (210)

Basidiospores (2,300)

Epicoccum (27)

Pithomyces (13)

3404 3813 I6 Squad Room (114), middle of room

490 Basidiospores (270)

Cladosporium (53)

Epicoccum (13)

Penicillium/Aspergillus types

(160)

3404 3812 I7 Office 102, middle of room

600 Alternaria (13)

Basidiospores (270)

Cladosporium (110)

Penicillium/Aspergillus types

(210)

3404 3803 I8 Office 107, middle of room

480 Ascospores (270)

Basidiospores (210)

3404 3797 I9 Office 110, middle of room

1,100 Ascospores (430)

Basidiospores (430)

Cladosporium (53)

Other brown (13)

Penicillium/Aspergillus types

(160)

Laboratory

Sample ID #

Terracon

Sample

ID Sample Location

Total

Concentration

(spores/m3)

Mold Spore Types and

Concentrations (spores/m3)

3404 3806 I10 Conference Room

B02, middle of room

560 Alternaria (13)

Basidiospores (430)

Penicillium/Aspergillus types

(110)

Pithomyces (13)

3404 3808 I11 Lunchroom B04, middle of room

430 Alternaria (67)

Ascospores (53)

Basidiospores (270)

Bipolaris/Drechslera group (13)

Pithomyces (27)

3404 3882 E2 5 feet east of exterior door to lunchroom B04

9,300 Alternaria (120)

Ascospores (1,500)

Basidiospores (6,100)

Cercospora (93)

Cladosporium (1,000)

Epicoccum (13)

Ganoderma (270)

Other colorless (13)

Smuts, Periconia, Myxomycetes

(13)

Sampling results from the interior areas were compared to those collected outside the building. A comparison of the sampling results yielded the following findings:

1. Total airborne mold spore concentrations inside of the building ranged from 430 spores/m3 to 2,600 spores/m3.

2. The total outdoor mold spore concentrations were 9,300 spores/m3 and 30,000 spores/m3. The types of outdoor mold spores identified were considered by the analytical laboratory as typical for the outdoor environment and were in the low to high concentration ranges for August in Iowa climate code.

3. The types of molds identified inside the building were generally similar to those found outdoors. Building related growth is dependent upon the fungal type, moisture levels and type of materials, in addition to other factors. Mold spore concentrations indoors were lower than those found outdoors and do not indicate apparent indoor amplification at this time.

The locations of the mold spore trap samples can be found in Exhibits 1 and 2 in Appendix A.

Photographic documentation is provided in Appendix D. Air sampling worksheets, pump calibration records are included in Appendix B. The laboratory analytical results for the spore trap sampling are included in Appendix C.

4.0 CONCLUSIONS

Based on our August 10, 2022 investigation, our conclusions are presented below:

◼ Concentrations of mold spores collected in the interior were relatively similar to the types found in the outdoors and were below outdoor concentrations at the time of our investigation.

◼ Apparent moisture impacted wallboard was observed in along the eastern wall in Squad Room 114, the eastern wall in Reception 125, and on the southern wall of the hallway to the south of Reception 125.

◼ Visible microbial growth was not readily observed in the above referenced locations.

◼ Apparent moisture impacted carpet was observed in Theatre Room 116 in the southwest corner of the room and just west of the doorway to Reception 125.

◼ Apparent water staining on ceiling tiles was noted in the following rooms. The ceiling tiles did not exhibit wet conditions at the time of the survey.

◼ Squad Room (114)

◼ Storage Room (115)

◼ Theatre (116)

◼ Reception (125)

◼ Display Area (118)

◼ Office 123.

◼ Water staining was also apparent on the spray-applied textured ceiling in the following rooms:

◼ Office 123, ◼ Display Area (118), ◼ Men’s Restroom 120, ◼ Women’s Restroom 119.

◼ Water staining was also apparent on CMU and drywall walls in the following rooms:

◼ Reception (125), ◼ Office 123, ◼ Women’s Restroom 119, ◼ Squad Room (114).

5.0 RECOMMENDATIONS

Terracon recommends the following:

◼ Replace water-stained ceiling tiles.

◼ Remove drywall and other materials that are exhibiting saturation. The location of the moisture impacted drywall and carpet is outlined on Exhibit 3 presented in Appendix A.

o The drywall should be removed to a height at least 1-foot above the apparent saturation zone.

◼ Clean and dry wall studs behind drywall as warranted with detergent or biocide.

◼ Lightly porous or semi-porous materials that are visibly impacted by moisture may be reusable depending on the depth to which moisture has penetrated the substrate or the integrity of the material has deteriorated due to water damage.

o The carpeting may be able to be dried and cleaned.

◼ Clean non-porous surfaces (plaster, CMU, Diffusers, tables, etc.) exhibiting microbial growth with a detergent/disinfectant and water solution (such as Fiber lock Technologies Shockwave or similar product) or biocide. Allow to dry thoroughly. If a biocide solution is used, select one that will not leave a residue.

◼ During the physical investigation of the building, Terracon noted the presence of a texture on the plaster ceiling located in the Display Room (118), Office

123, Women’s Restroom 119 and Men’s Restroom 120. Terracon sampled this material as a part of Terracon’s Moisture, Microbial, and Asbestos Survey dated July 8, 2022. Laboratory analysis of the samples confirmed the presence of asbestos in the spray-applied texture.

◼ Please refer to Terracon’s Moisture, Microbial, and Asbestos

Survey Report dated July 8, 2022 for appropriate recommendations as it relates to the spray-applied texture.

◼ Disinfection is not a substitute for the removal of water-damaged or fungal-containing porous materials since dead molds remain allergenic. Dry all surfaces thoroughly after cleaning.

APPENDIX A

Exhibits

1st Floor Moisture and Spore Trap Sample Diagram

USACE Administrative Building 2850 Prairie Du Chien Road NE

Iowa City, Johnson County, Iowa

2640 12th Street SW Cedar Rapids, Iowa 52404

PH. (319) 366-8321 FAX. (319) 366-0032

06227092

August 2022

TLR

TLR

EWH

EWH

Not to Scale

Project Manager:

Drawn by:

Checked by:

Approved by:

Project No.

Scale:

File Name:

Date:

Exhibit

ExhibitsDIAGRAM IS FOR GENERAL LOCATION

ONLY, AND IS NOT INTENDED FOR

CONSTRUCTION PURPOSES

Basement Moisture and Spore Trap Sample Diagram

2850 Prairie Du Chien Road NE

Iowa City, Johnson County, Iowa

2640 12th Street SW Cedar Rapids, Iowa 52404

PH. (319) 366-8321 FAX. (319) 366-0032

06227092

August 2022

TLR

TLR

EWH

EWH

Not to Scale

Project Manager:

Drawn by:

Checked by:

Approved by:

Project No.

Scale:

File Name:

Date:

Exhibit

ExhibitsDIAGRAM IS FOR GENERAL LOCATION

Moisture-Impacted Drywall and Carpet Location Diagram

2850 Prairie Du Chien Road NE

Iowa City, Johnson County, Iowa

2640 12th Street SW Cedar Rapids, Iowa 52404

PH. (319) 366-8321 FAX. (319) 366-0032

06227092

August 2022

TLR

TLR

EWH

EWH

Not to Scale

Project Manager:

Drawn by:

Checked by:

Approved by:

Project No.

Scale:

File Name:

Date:

Exhibit

ExhibitsDIAGRAM IS FOR GENERAL LOCATION

APPENDIX B

Mold Sampling Worksheets

Pump Calibration Data

APPENDIX C

Analytical Laboratory Report and COC

Approved by:

Technical Manager Ariunaa Jalsrai

Report for:

Taryn Rowley Terracon, Cedar Rapids 2640 12th St SW Cedar Rapids, IA 52404

Regarding: Project: 06227092-2; USACE Admin Building

EML ID: 3000841

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 EMLab P&K ("the Company") 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: 08-13-2022

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

Eurofins EMLab P&K'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: 3000841, Page 1 of 8Eurofins EPK Built Environment Testing, LLC

Eurofins EMLab P&K 3000 Lincoln Drive East, Suite A, Marlton, NJ 08053

(866) 871-1984 Fax (856) 334-1040 www.emlab.com Client: Terracon, Cedar Rapids C/O: Taryn Rowley Re: 06227092-2; USACE Admin Building

Date of Sampling: 08-10-2022 Date of Receipt: 08-11-2022 Date of Report: 08-15-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3780:

Exterior, outside of reception 3404 3775:

South end display area 118 Comments (see below) A None

Lab ID-Version‡: 14440604-1 14440605-1

Analysis Date: 08/13/2022 08/13/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 134 100 1,800 1 100 13 Ascospores 19 25 1,000 2 25 110 Basidiospores 144 25 7,700 11 25 590 Bipolaris/Drechslera group Cercospora 11 100 150 Chaetomium Choanephora 18 100 240 Cladosporium 158/693 25/100 18,000 Curvularia 3 100 40 Epicoccum 8 100 110 Fusarium 1 100 13 Ganoderma 3 25 160 Nigrospora 4 100 53 Other brown 3 100 40 Other colorless Penicillium/Aspergillus types† 7 25 370 Pithomyces 30 100 400 Polythrincium 12 100 160 Rusts 2 100 27 Smuts, Periconia, Myxomycetes 4 100 53 1 100 13 Stachybotrys Background debris (1-4+)†† 2+ 3+ Hyphal fragments/m3 27 < 13 Pollen/m3 40 27 Skin cells (1-4+) < 1+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 30,000 720 Comments:A) 693 of the raw count Cladosporium spores were present as a single clump.

EMLab ID: 3000841, Page 2 of 8Eurofins 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 Fax (856) 334-1040 www.emlab.com Client: Terracon, Cedar Rapids C/O: Taryn Rowley Re: 06227092-2; USACE Admin Building

Date of Sampling: 08-10-2022 Date of Receipt: 08-11-2022 Date of Report: 08-15-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3800:

North end display area 118 3404 3919:

Office 123

Comments (see below) None None

Lab ID-Version‡: 14440606-1 14440607-1

Analysis Date: 08/13/2022 08/13/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria Ascospores 2 25 110 1 25 53 Basidiospores 1 25 53 14 25 750 Bipolaris/Drechslera group Cercospora Chaetomium Choanephora Cladosporium 8 25 430 3 25 160 Curvularia Epicoccum 1 100 13 1 100 13 Fusarium Ganoderma Nigrospora Other brown Other colorless Penicillium/Aspergillus types† 1 25 53 Pithomyces 1 25 53 Polythrincium Rusts 1 100 13 Smuts, Periconia, Myxomycetes Stachybotrys Background debris (1-4+)†† 2+ 2+ Hyphal fragments/m3 < 13 < 13 Pollen/m3 < 13 < 13 Skin cells (1-4+) 1+ < 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 650 1,000 Comments:

EMLab ID: 3000841, Page 3 of 8Eurofins 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 Fax (856) 334-1040 www.emlab.com Client: Terracon, Cedar Rapids C/O: Taryn Rowley Re: 06227092-2; USACE Admin Building

Date of Sampling: 08-10-2022 Date of Receipt: 08-11-2022 Date of Report: 08-15-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3702:

Theatre room 116 3404 3811:

Reception area 125 Comments (see below) None None

Lab ID-Version‡: 14440608-1 14440609-1

Analysis Date: 08/13/2022 08/13/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 2 100 27 1 100 13 Ascospores 4 25 210 4 25 210 Basidiospores 19 25 1,000 44 25 2,300 Bipolaris/Drechslera group Cercospora Chaetomium Choanephora Cladosporium Curvularia Epicoccum 2 100 27 Fusarium Ganoderma Nigrospora 2 100 27 Other brown Other colorless Penicillium/Aspergillus types† Pithomyces 1 100 13 Polythrincium Rusts Smuts, Periconia, Myxomycetes Stachybotrys Background debris (1-4+)†† 3+ 2+ Hyphal fragments/m3 40 13 Pollen/m3 13 < 13 Skin cells (1-4+) < 1+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 1,300 2,600 Comments:

EMLab ID: 3000841, Page 4 of 8Eurofins 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 Fax (856) 334-1040 www.emlab.com Client: Terracon, Cedar Rapids C/O: Taryn Rowley Re: 06227092-2; USACE Admin Building

Date of Sampling: 08-10-2022 Date of Receipt: 08-11-2022 Date of Report: 08-15-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3813:

Squad room 114 3404 3812:

Office 102

Comments (see below) None None

Lab ID-Version‡: 14440610-1 14440611-1

Analysis Date: 08/13/2022 08/13/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 1 100 13 Ascospores Basidiospores 5 25 270 5 25 270 Bipolaris/Drechslera group Cercospora Chaetomium Choanephora Cladosporium 1 25 53 2 25 110 Curvularia Epicoccum 1 100 13 Fusarium Ganoderma Nigrospora Other brown Other colorless Penicillium/Aspergillus types† 3 25 160 4 25 210 Pithomyces Polythrincium Rusts Smuts, Periconia, Myxomycetes Stachybotrys Background debris (1-4+)†† 2+ 3+ Hyphal fragments/m3 27 40 Pollen/m3 < 13 < 13 Skin cells (1-4+) 1+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 490 600 Comments:

EMLab ID: 3000841, Page 5 of 8Eurofins 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 Fax (856) 334-1040 www.emlab.com Client: Terracon, Cedar Rapids C/O: Taryn Rowley Re: 06227092-2; USACE Admin Building

Date of Sampling: 08-10-2022 Date of Receipt: 08-11-2022 Date of Report: 08-15-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3803:

Office 107 3404 3797:

Office 110

Comments (see below) None None

Lab ID-Version‡: 14440612-1 14440613-1

Analysis Date: 08/13/2022 08/13/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria Ascospores 5 25 270 8 25 430 Basidiospores 4 25 210 8 25 430 Bipolaris/Drechslera group Cercospora Chaetomium Choanephora Cladosporium 1 25 53 Curvularia Epicoccum Fusarium Ganoderma Nigrospora Other brown 1 100 13 Other colorless Penicillium/Aspergillus types† 3 25 160 Pithomyces Polythrincium Rusts Smuts, Periconia, Myxomycetes Stachybotrys Background debris (1-4+)†† 3+ 2+ Hyphal fragments/m3 < 13 27 Pollen/m3 13 13 Skin cells (1-4+) 1+ < 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 480 1,100 Comments:

EMLab ID: 3000841, Page 6 of 8Eurofins 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 Fax (856) 334-1040 www.emlab.com Client: Terracon, Cedar Rapids C/O: Taryn Rowley Re: 06227092-2; USACE Admin Building

Date of Sampling: 08-10-2022 Date of Receipt: 08-11-2022 Date of Report: 08-15-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3806:

Conference B02 3404 3808:

Lunchroom B04 Comments (see below) None None

Lab ID-Version‡: 14440614-1 14440615-1

Analysis Date: 08/13/2022 08/13/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 1 100 13 5 100 67 Ascospores 1 25 53 Basidiospores 8 25 430 5 25 270 Bipolaris/Drechslera group 1 100 13 Cercospora Chaetomium Choanephora Cladosporium Curvularia Epicoccum Fusarium Ganoderma Nigrospora Other brown Other colorless Penicillium/Aspergillus types† 2 25 110 Pithomyces 1 100 13 2 100 27 Polythrincium Rusts Smuts, Periconia, Myxomycetes Stachybotrys Background debris (1-4+)†† 3+ 4+ Hyphal fragments/m3 13 67 Pollen/m3 < 13 27 Skin cells (1-4+) 1+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 560 430 Comments:

EMLab ID: 3000841, Page 7 of 8Eurofins 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 Fax (856) 334-1040 www.emlab.com Client: Terracon, Cedar Rapids C/O: Taryn Rowley Re: 06227092-2; USACE Admin Building

Date of Sampling: 08-10-2022 Date of Receipt: 08-11-2022 Date of Report: 08-15-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3882:

Exterior, lunchroom door Comments (see below) B

Lab ID-Version‡: 14440616-1

Analysis Date: 08/13/2022 raw ct. % read spores/m3 Alternaria 9 100 120 Ascospores 28 25 1,500 Basidiospores 115 25 6,100 Bipolaris/Drechslera group Cercospora 7 100 93 Chaetomium Choanephora Cladosporium 10/44 25/100 1,100 Curvularia Epicoccum 1 100 13 Fusarium Ganoderma 5 25 270 Nigrospora Other brown Other colorless 1 100 13 Penicillium/Aspergillus types† Pithomyces Polythrincium Rusts Smuts, Periconia, Myxomycetes 3 100 40 Stachybotrys Background debris (1-4+)†† 2+ Hyphal fragments/m3 27 Pollen/m3 < 13 Skin cells (1-4+) < 1+ Sample volume (liters) 75 § TOTAL SPORES/m3 9,300 Comments:B) 44 of the raw count Cladosporium spores were present as a single clump.

EMLab ID: 3000841, Page 8 of 8Eurofins 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,…