Terracon_20C0060 - 01 57 19-5 Lab Analysis 10 JUN 2022.pdf

Moisture and Microbial Investigation Report

USACE Coralville Reservoir Administrative Building 2850 Prairie Du Chien Road NE

Iowa City, Iowa 52240

June 10, 2022

Terracon Project No. 06227092

Prepared for:

Greenstone Construction, Ince

Fargo, North Dakota

Prepared by:

Terracon Consultants, Inc.

Cedar Rapids, Iowa

Responsive ■ Resourceful ■ Reliable ii

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 Tape-Lift Sample Results

3.5 Mold Spore Trap Sample Results

4.0 CONCLUSIONS

5.0 RECOMMENDATIONS

APPENDICES

APPENDIX A Exhibits

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

APPENDIX B Mold Sampling Worksheets Pump Calibration Data

APPENDIX C Analytical Laboratory Reports and COCs APPENDIX D Photographic Documentation

Mold and Moisture Investigation Report USACE Admin Building ■ Iowa City, Iowa June 10, 2022 ■ Terracon Project No. 06227092

Responsive ■ Resourceful ■ Reliable

Moisture and Microbial Investigation Report USACE Coralville Reservoir Administrative Building

Iowa City, Iowa

Terracon Project No. 06227092 June 10, 2022

1.0 PROJECT DESCRIPTION

On June 2, 2022, Terracon Consultants, Inc. (Terracon) conducted a moisture and microbial investigation at the United States Army Corps of Engineers (USACE) Coralville Reservoir Administrative Building in Iowa City, Iowa. Terracon representative, Ms. Taryn Rowley, 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 proposal dated June 1, 2022.

Terracon understands that the 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 in the spring. 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 understands that ServPro placed several drying units throughout the building and collected moisture readings with a moisture meter prior to ceasing drying activities. We understand that the USACE has requested these services in order to determine locations of potential microbial growth and to determine the location of moisture-effected building materials.

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;

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.

Moisture and Microbial Investigation Report

1.2 Standard of Care

This investigation was conducted on June 2, 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; however, per the authorization of Greenstone, Terracon completed a limited intrusive investigation to inspect interior wall cavity spaces in Office 108 and in Reception 125. 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 E.

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 Outside of western doorway to Display Area 118

1st Floor:

Reception (125), middle of room Squad Room (114), middle of room Theatre Room (116), middle of room Storage Room (115), middle of room Display Room (118), 5 feet north of southern wall, middle of room from east to west Display Room (118), 10 feet south of northern wall, middle of room from east to west Office 123, middle of room Office 110, middle of room Office 108, middle of room Office 107, 2 feet north of southern wall, middle of room from east to west Office 104, middle of room Office 102, middle of room Corridor 113, outside of women’s restroom doorway, middle of hallway from north to south Basement:

Conference Room (B02), 2 feet north of southern wall, middle of room from east to west

Lunchroom (B04), middle of room Locker Room (B07), middle of eastern locker area Corridor B10, middle of corridor from north to south, just west of doorway to

Locker Room (B07) Stairwell (B01), middle of landing between 1st and 2nd floors

Utilizing Zefon BioTape™ samplers Terracon also collected three tape lift samples from the following surfaces that exhibited apparent microbial growth:

On HVAC vent in Women’s Restroom 111 On HVAC vent in Office 105 On air vent in Women’s Restroom 119

The locations of the tape lift samples are presented in Exhibit 1 in Appendix A.

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

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;

however, Terracon performed an intrusive investigation on the south wall in Reception 125 and above the drop ceiling on the south wall in Office 108. The drywall did not appear to be impacted by microbial growth based on Terracon’s investigation in the wall cavities in these rooms.

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. Several ceiling locations appeared to have water staining; 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 west of the narthex and sanctuary) 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.

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”

(inches) 9.6 Dry

M-2 Middle of east wall Drywall 4” 6.2 Dry

M-3 Southwest corner of room

Drywall 4” 7.8 Dry

M-4

Middle of ceiling, west of southern light

Drywall Ceiling 12.2 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-5 Middle of western wall, on ceiling

Drywall Ceiling 9.8 Dry

M-6 Just north of the middle of the ceiling

Drywall Ceiling 10.6 Dry

M-7

Office 108

Middle of south wall Drywall 4” 9.8 Dry

M-8 Middle of east wall Drywall 4” 10.6 Dry

M-9 Middle of west wall Drywall 4” 11.2 Dry

M-10 Middle of north wall Drywall 4” 12.3 Dry

M-11 Southern wall above window

Drywall 12’ (feet) 10.6 Dry M-12 Drywall 14’ 8.2 Dry M-13 Drywall Ceiling 6.3 Dry

M-14

Office 109

Middle of east wall

Drywall 4” 10.6 Dry

M-15 Middle of west wall

Drywall 4” 8.2 Dry

M-16 Middle of north wall Drywall 4” 9.3 Dry

M-17 Southwest corner of south wall

Drywall 4” 12.6 Dry

M-18

Office 106

Middle of north wall Drywall 4” 9.8 Dry

M-19 Middle of south wall Drywall 4” 10.2 Dry

M-20 Middle of west wall Drywall 4” 12.6 Dry

M-21 Middle of east wall

Drywall 4” 8.6 Dry

M-22 On the jut-out along the northern wall under the duct

Drywall 8’ 7.2 Dry

M-23 Drywall 10’ 3.2 Dry

M-24

Office 110

Under eastern window Drywall 4’ 8.2 Dry

M-25 Under western window

Drywall 4’ 8.6 Dry

Location Number Room Location

Description Material Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-26

Middle of west wall, above drop ceiling

Drywall 12’ 6.3 Dry

M-27 Middle of north wall Drywall 4” 10.2 Dry

M-28 Middle of west wall Drywall 4” 12.3 Dry

M-29 Middle of east wall Drywall 4” 11.6 Dry

M-30 Middle of south wall Drywall 4” 8.2 Dry

M-31

Office 104

Middle of north wall Drywall 4” 8.2 Dry

M-32 Middle of west wall Drywall 4” 9.6 Dry

M-33 Middle of east wall Drywall 4” 10.2 Dry

M-34 Middle of south wall Drywall 4” 12.3 Dry

M-35

Office 103

Northeast corner, eastern wall

Drywall 4” 12.1 Dry

M-36 Middle of north wall

Drywall 4” 8.2 Dry

M-37 Middle of west wall Drywall 4” 10.6 Dry

M-38 Northeast corner, north wall, above drop ceiling

Drywall 12’ 11.6 Dry

M-39

Northeast corner, east wall, above drop ceiling

Drywall 12’ 12.2 Dry

M-40

Office 102

Middle of north wall Drywall 4” 10.2 Dry

M-41 Middle of south wall Drywall 4” 10.3 Dry

M-42 Southeast corner, east wall

Drywall 4” 8.4 Dry

Location Number Room Location

Description Material Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-43 Northwest corner, west wall

Drywall 4” 9.2 Dry

M-44

Men’s Restroom

Middle of east wall

Drywall 4” 8.6 Dry

M-45 Middle of west wall

Drywall 4” 7.2 Dry

M-46 Southeast corner, south wall

Drywall 4” 8.2 Dry

M-47 Southwest corner, south wall

Drywall 4” 10.6 Dry

M-48

Women’s Restroom

Southwest corner, south wall

Drywall 4” 8.2 Dry

M-49 Southeast corner, south wall

Drywall 4” 8.4 Dry

M-50 Middle of east wall

Drywall 4” 8.6 Dry

M-51 Middle of west wall Drywall 4” 10.2 Dry

M-52 Middle of south wall Drywall Ceiling 11.3 Dry

M-53 Southeast corner, south wall

Drywall Ceiling 12.2 Dry

M-54

Corridor 113

Just west outside of room 112

Drywall 4” 8.2 Dry

M-55 Just east of doorway to Office 105

Drywall 4” 6.2 Dry

M-56

Stairwell B01

South wall of stairwell

Drywall 4” 10.2 Dry

M-57 East wall of stairwell landing

Drywall 4” 8.7 Dry

M-58 West wall of stairwell landing

Drywall 4” 6.3 Dry

Location Number Room Location

Description Material Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-59

Corridor B10

Just west of doorway to locker room B07

Drywall 4” 10.4 Dry

M-60

North of doorway to locker room B07

Drywall 4” 11.2 Dry

M-61 Conference Room B02

Middle of north wall Drywall 4” 8.6 Dry

M-62 Middle of east wall Drywall 4” 8.3 Dry

M-63 Locker room

B07

Middle of north wall Drywall 4” 5.6 Dry

M-64 Southwest corner of south wall

Drywall 4” 6.2 Dry

M-65

Lunchroom B04

Middle of east wall Drywall 4” 8.6 Dry

M-66 Middle of south wall Drywall 4” 7.2 Dry

M-67 Middle of north wall Drywall 4” 6.4 Dry

M-68

Squad Room 114

Northwest corner, west wall

Drywall 4” 6.2 Dry

M-69 Northwest corner, north wall

Drywall 4” 5.7 Dry

M-70 Middle of west wall

Drywall 4” 6.7 Dry

M-71 Southwest corner, west wall

Drywall 4” 8.3 Dry

M-72 Middle of south wall Drywall 4” 8.7 Dry

M-73

Southeast corner, eastern pipe chase

Drywall 4” 8.5 Dry

M-74 Middle of east wall Drywall 4” 9.2 Dry

Location Number Room Location

Description Material Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-75 Northeast corner, east wall

Drywall 4” 7.3 Dry

M-76 Middle of east wall

Ceiling Tile Ceiling 6.3 Dry

M-77 West of eastern pipe chase

Ceiling Tile Ceiling 3.2 Dry

M-78

Storage Room 115

Northeastern corner, north wall

Drywall 4” 8.2 Dry

M-79 Middle of east wall

Drywall 4” 6.3 Dry

M-80 Middle of south wall

Drywall 4” 9.3 Dry

M-81

Reception

Just west of northern doorway to room

Drywall

4” 10.2 Dry

M-82 Southwest corner, south wall

Drywall 4” 11.3 Dry

M-83 Just west of southern doorway

Drywall 4” 12.2 Dry

M-84 Just east of southern doorway

Drywall 4” 11.7 Dry

M-85 2 feet east of southern doorway

Drywall 4” 8.7 Dry

M-86 4 feet east of southern doorway

Drywall 4” 57.3 Wet

M-87 Drywall 8” 13.2 Dry

M-88 8 feet east of southern doorway

Drywall 4” 12.3 Dry

M-89 Entryway south of

Reception

Northeast corner, east wall

Drywall 4” 10.6 Dry

M-90 Northeast corner, north wall

Drywall 4” 8.2 Dry

M-91 Middle of south wall Drywall 4” 12.2 Dry

Location Number Room Location

Description Material Height above ground surface

Moisture Reading - Measure

Mode

(% WME1)

Interpretation2

M-92 Just north of western doorway

Drywall 4” 8.6 Dry

M-93 Electrical Room 124

Middle of north wall Drywall 4” 5.2 Dry

M-94

Display Room 118

Middle of north wall Drywall 4” 6.3 Dry

M-95 Middle of east wall Drywall 4” 10.2 Dry

M-96 Southwest corner, west wall

Drywall 4” 12.3 Dry

M-97 Middle of south wall Drywall 4” 13.2 Dry

M-98 Northeast corner, east wall

Drywall 4” 9.6 Dry

M-99 Northeast corner, north wall

Drywall Ceiling 12.2 Dry

M-100 Middle of east wall Drywall Ceiling 9.6 Dry

M-101 Middle of west wall Drywall Ceiling 10.3 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 June 2, 2022: high temperature of 76 F, an average of 66 F; clear skies; an average wind speed of 6.7 miles per hour from the north; and a relative humidity average of 53%.

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.

3 Posted at: https://w2.weather.gov/climate/index.php?wfo=dvn; accessed June 6, 2022.

Table 3. Temperature and Relative Humidity Levels Location Temperature Relative Humidity

10 feet southeast of eastern building entrance to Reception 125 72.5°F 34.2%

Reception area 125, middle of room 77.7°F 39.6% Squad Room 114, middle of room 77.7°F 39.4% Theatre Room 116, middle of room 76.4°F 37.7% Storage room north of Theatre Room 116, middle of room 76.8°F 38.5% Display Room 118, 5 feet north of southern wall, middle of room from east to west 76.5°F 44.2%

Display Room 118, 10 feet south of northern wall, middle of room from east to west 76.3°F 46.4%

Office 123, middle of room 77.0°F 39.4% Office 110, middle of room 73.0°F 38.1% Office 108, middle of room 69.8°F 43.8% Office 107, 2 feet north of south wall middle of room from east to west 68.9°F 44.9%

Office 104, middle of room 67.4°F 48.6% Office 102, middle of room 69.7°F 49.5% Corridor 113, outside of women’s restroom doorway, middle of hallway from north to south 69.7°F 46.6%

Conference Room B02, 2 feet north of south wall, middle of room from east to west 67.8°F 47.6%

Lunchroom B04, middle of room 69.8°F 45.6% Locker room B07, middle of eastern locker area 70.3°F 44.7% Corridor B10, just west of doorway to Locker room B07 71.4°F 46.8% Stairwell B01, middle of landing between 1st floor and basement 70.1°F 44.5%

Just outside of western doorway to Display Room 118 73.2°F 29.6%

3.4 Tape-Lift Sample Results

Terracon collected tape-lift samples of suspect mold on three surfaces to determine if mold spores were present. Terracon did not observe heavy dust accumulations on visible surfaces.

Sampling locations are indicated on Exhibit 1 in Appendix A. Table 4 summarizes the results of the tape-lift sampling. The results of the tape-lift sampling confirmed that mold was present on the metal HVAC vents.

Table 4. Tape-Lift Sample Results

Sample # Location Substrate Results4 Comments

T01 On HVAC vent in Women’s

Restroom 111

Metal 4+ Cladosporium species (spores, hyphae, conidiophores)

Mold growth

T02 On HVAC vent in Office 105

Metal 4+ Cladosporium species (spores, hyphae, conidiophores)

Mold growth

T03 On air vent in Women’s

Restroom 119

Metal None Normal Trapping

Terracon understands that the microbial growth identified on the HVAC vents in Women’s Restroom 111 and Office 105 was present prior to the water intrusion event detailed in Section

1.0. Laboratory analytical results of the tape-lift samples are provided in Appendix B.

Photographic documentation is provided in Appendix D.

3.5 Mold Spore Trap Sample Results

Terracon collected spore trap samples at 18 locations inside the building and 2 locations outside of the building. Table 5 summarizes the results of the spore trap sampling. The results are reported in spores per cubic meter (spores/m3).

Table 5. Spore Trap Sampling Results

Laboratory Sample ID #

Terracon Sample

ID Sample Location

Total Concentration

(spores/m3) Mold Spore Types and

Concentrations (spores/m3) 3377 5515 E1 10 feet southeast of eastern building entrance to

Reception 125

5,400 Alternaria (27) Ascospores (1,400) Basidiospores (2,200) Cladosporium (1,700) Epicoccum (27) Smuts, Periconia, Myxomycetes (53)

3377 6024 I1 Reception area 125, middle of room

360 Alternaria (13) Basidiospores (160) Cladosporium (53) Epicoccum (13) Penicillium/Aspergillus types (110) Smuts, Periconia, Myxomycetes (13)

4 Quantities of molds graded <1+ to 4+, with 4+ denoting the highest numbers.

Laboratory Sample ID #

Terracon Sample

ID Sample Location

Total Concentration

(spores/m3) Mold Spore Types and

Concentrations (spores/m3) 3377 5529 I2 Squad Room 114, middle of room 120 Basidiospores (53)

Cladosporium (53) Epicoccum (13)

3377 5379 I3 Theatre Room 116, middle of room

280 Ascospores (53) Basidiospores (53) Cladosporium (160) Smuts, Periconia, Myxomycetes (13)

3377 5364 I4 Storage room north of Theatre Room

116, middle of room

120 Basidiospores (110) Smuts, Periconia, Myxomycetes (13)

3377 5521 I5 Display Room 118, 5 feet north of southern wall, middle of room from east to west

13 Smuts, Periconia, Myxomycetes (13)

3377 5490 I6 Display Room 118, 10 feet south of northern wall, middle of room from east to west

280 Penicillium/Aspergillus types (270) Smuts, Periconia, Myxomycetes (13)

3377 5517 I7 Office 123, middle of room

120 Basidiospores (53) Epicoccum (13) Penicillium/Aspergillus types (53)

3377 5501 I8 Office 110, middle of room

67 Basidiospores (53) Smuts, Periconia, Myxomycetes (13)

3377 5382 I9 Office 108, middle of room

210 Ascospores (110) Cladosporium (110)

3377 5493 I10 Office 107, 2 feet north of south wall middle of room from east to west

67 Basidiospores (53) Pithomyces (13)

3377 5993 I11 Office 104, middle of room

110 Ascospores (53) Basidiospores (13)

Laboratory Sample ID #

Terracon Sample

ID Sample Location

Total Concentration

(spores/m3) Mold Spore Types and

Concentrations (spores/m3) 3377 5385 I12 Office 102, middle of room 250 Alternaria (13)

Basidiospores (53) Cladosporium (53) Penicillium/Aspergillus types (110) Rusts (13) Smuts, Periconia, Myxomycetes (13)

3377 5381 I13 Corridor 113, outside of women’s restroom doorway, middle of hallway from north to south

120 Cladosporium (53) Epicoccum (13) Penicillium/Aspergillus types (53)

3404 3809 I14 Conference Room B02, 2 feet north of south wall, middle of room from east to west

210 Basidiospores (160) Cladosporium (53)

3404 3793 I15 Lunchroom B04, middle of room

110 Ascospores (53) Basidiospores (53)

3404 3796 I16 Locker room B07, middle of eastern locker area

120 Alternaria (13) Basidiospores (110)

3377 5513 I17 Corridor B10, just west of doorway to Locker room B07

110 Basidiospores (53) Cladosporium (53)

3377 5524 I18 Stairwell B01, middle of landing between 1st floor and basement

210 Ascospores (53) Basidiospores (53) Cladosporium (110)

3377 5536 E2 Just outside of western doorway to Display Room 118

8,700 Alternaria (13) Ascospores (2,800) Basidiospores (3,400) Cladosporium (2,500) Curvularia (13) Epicoccum (27) Smuts, Periconia, Myxomycetes (40)

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 13 spores/m3 to 360 spores/m3.

2. The total outdoor mold spore concentrations were 5,400 spores/m3 and 8,700 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 June 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 June 2, 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.

Tape lift samples confirmed mold on HVAC diffusers in Women’s Restroom 111 and in Office 109 and Office 105.

Terracon did not observe mold growth in the duct work Saturated wallboard was observed in southeastern corner of the south wall in

Reception 125 above the base cove.

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 moisture impacted drywall. The location of the moisture impacted drywall is outlined on Exhibit 3 presented in Appendix A.

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 recommends that this material be sampled for asbestos prior to any disturbance to the material5.

Lightly porous or semi-porous materials (e.g. drywall) 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.

If the material is determined to not be reusable, the material should be removed.

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

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.

5 This service was offered as an optional service in the Terracon Proposal No. P06227092; however, this service was not authorized by the client.

APPENDIX A

Exhibits

1st Floor Moisture, Spore Trap, and Tape Lift 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

June 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, Spore Trap, and Tape Lift 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

June 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 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

June 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 Reports and COCs

Approved by:

Technical Manager Ariunaa Jalsrai

Report for:

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

Regarding: Project: 06227092; USACE Admin Building

EML ID: 2942253

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 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:

Direct microscopic exam (Qualitative): 06-06-2022

Service SOPs: Direct microscopic exam (Qualitative) (EM-MY-S-1039) 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: 2942253, Page 1 of 2Eurofins 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; USACE Admin Building

Date of Sampling: 06-02-2022 Date of Receipt: 06-03-2022 Date of Report: 06-06-2022

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‡: 14134551-1, Analysis Date: 06/06/2022: Tape sample TO1: Vent in northern women's room Heavy Very few 4+ Cladosporium species (spores, hyphae, conidiophores) None Mold growth

Lab ID-Version: 14134552-1, Analysis Date: 06/06/2022: Tape sample TO2: Vent in office 109 Heavy Very few 4+ Cladosporium species (spores, hyphae, conidiophores) None Mold growth

Lab ID-Version: 14134553-1, Analysis Date: 06/06/2022: Tape sample TO3: Vent in southern women's restroom Heavy Very few None None Normal trapping

* 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: 2942253, Page 2 of 2Eurofins EPK Built Environment Testing, LLC

Ariunaa Jalsrai

Report for:

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

Regarding: Project: 06227092; USACE Admin Building

EML ID: 2942253

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: 06-06-2022

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

EMLab ID: 2942253, Page 1 of 11Eurofins EPK Built Environment Testing, LLC

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

Date of Sampling: 06-02-2022 Date of Receipt: 06-03-2022 Date of Report: 06-06-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3377 5515:

10 ft Southeast eastern, exterior 3377 6024:

Room 125

Comments (see below) None None Lab ID-Version‡: 14134554-1 14134555-1 Analysis Date: 06/06/2022 06/06/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 2 100 27 1 100 13 Ascospores 26 25 1,400 Basidiospores 41 25 2,200 3 25 160 Chaetomium Cladosporium 32 25 1,700 1 25 53 Curvularia Epicoccum 2 100 27 1 100 13 Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† 2 25 110 Pithomyces Rusts Smuts, Periconia, Myxomycetes 4 100 53 1 100 13 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+)†† 2+ 2+ Hyphal fragments/m3 27 < 13 Pollen/m3 390 < 13 Skin cells (1-4+) < 1+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 5,400 360 Comments:

EMLab ID: 2942253, Page 2 of 11Eurofins 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. The limit of detection is the analytical sensitivity (in spores/m^3) multiplied by the sample volume (in liters) divided by 1000 liters.

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; USACE Admin Building

Date of Sampling: 06-02-2022 Date of Receipt: 06-03-2022 Date of Report: 06-06-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3377 5529:

Room 114 3377 5379:

Room 116

Comments (see below) None None Lab ID-Version‡: 14134556-1 14134557-1 Analysis Date: 06/06/2022 06/06/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria Ascospores 1 25 53 Basidiospores 1 25 53 1 25 53 Chaetomium Cladosporium 1 25 53 3 25 160 Curvularia Epicoccum 1 100 13 Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† Pithomyces Rusts Smuts, Periconia, Myxomycetes 1 100 13 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+)†† 2+ 2+ Hyphal fragments/m3 < 13 13 Pollen/m3 < 13 < 13 Skin cells (1-4+) 2+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 120 280 Comments:

EMLab ID: 2942253, Page 3 of 11Eurofins 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. The limit of detection is the analytical sensitivity (in spores/m^3) multiplied by the sample volume (in liters) divided by 1000 liters.

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; USACE Admin Building

Date of Sampling: 06-02-2022 Date of Receipt: 06-03-2022 Date of Report: 06-06-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3377 5364:

Storage room north of theatre 3377 5521:

Room 118, north end Comments (see below) None None Lab ID-Version‡: 14134558-1 14134559-1 Analysis Date: 06/06/2022 06/06/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria Ascospores Basidiospores 2 25 110 Chaetomium Cladosporium Curvularia Epicoccum Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† Pithomyces Rusts Smuts, Periconia, Myxomycetes 1 100 13 1 100 13 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+)†† 1+ 2+ Hyphal fragments/m3 < 13 < 13 Pollen/m3 < 13 < 13 Skin cells (1-4+) 1+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 120 13 Comments:

EMLab ID: 2942253, Page 4 of 11Eurofins 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. The limit of detection is the analytical sensitivity (in spores/m^3) multiplied by the sample volume (in liters) divided by 1000 liters.

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; USACE Admin Building

Date of Sampling: 06-02-2022 Date of Receipt: 06-03-2022 Date of Report: 06-06-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3377 5490:

Room 118, south end 3377 5517:

Office 123

Comments (see below) None None Lab ID-Version‡: 14134560-1 14134561-1 Analysis Date: 06/06/2022 06/06/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria Ascospores Basidiospores 1 25 53 Chaetomium Cladosporium Curvularia Epicoccum 1 100 13 Fusarium Myrothecium Nigrospora Other colorless Penicillium/Aspergillus types† 5 25 270 1 25 53 Pithomyces Rusts Smuts, Periconia, Myxomycetes 1 100 13 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+)†† 1+ 1+ Hyphal fragments/m3 13 13 Pollen/m3 < 13 < 13 Skin cells (1-4+) 1+ 1+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 280 120 Comments:

EMLab ID: 2942253, Page 5 of 11Eurofins 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.