Terracon_20C0060 - 01 57 19-6 Mold Moisture Asbestos Investigation Report 08 JUL 22.pdf

Moisture, Microbial, and Asbestos Survey Report

USACE Coralville Reservoir Administrative Building

2850 Prairie Du Chien Road NE

Iowa City, Iowa 52240

July 8, 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

2.5 Limited Asbestos 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

3.6 Asbestos Sample Results

4.0 CONCLUSIONS

5.0 RECOMMENDATIONS

APPENDICES

APPENDIX A Exhibits

Exhibit 1 – 1st Floor Moisture, Spore Trap, Tape Lift, and Asbestos Sample Diagram Exhibit 2 – Basement Moisture, Spore Trap, and Tape Lift Sample Diagram Exhibit 3 – 1st Floor Moisture-Impacted Drywall Location Diagram Exhibit 4 – Basement Moisture-Impacted Drywall Location Diagram Exhibit 5 – 1st Floor Asbestos Location Diagram

APPENDIX B Mold Sampling Worksheets Pump Calibration Data

APPENDIX C

APPENDIX D

Microbial Laboratory Reports and COCs

Asbestos Laboratory Reports, COCs, and Inspector’s License

APPENDIX E

APPENDIX F

Photographic Documentation

Regulatory Overview

Moisture, Microbial, and Asbestos Survey Report USACE Admin Building ■ Iowa City, Iowa July 8, 2022 ■ Terracon Project No. 06227092

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Moisture, Microbial, and Asbestos Survey Report

USACE Coralville Reservoir Administrative Building

Iowa City, Iowa

Terracon Project No. 06227092

July 8, 2022

1.0 PROJECT DESCRIPTION

On June 21, 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 and Mr. Brian Hoy of Greenstone

Construction, Inc. (Greenstone) were 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 June 20, 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 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 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;

◼ Limited asbestos sampling; and

◼ Preparation of this report.

1.2 Standard of Care

This investigation was conducted on June 21, 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 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 E.

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

◼ Just outside of Lunchroom (B04) on concrete landing

1st Floor:

◼ Display Room (118), 5 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

Basement:

◼ Conference Room (B02), middle of room

◼ Lunchroom (B04), middle of room

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

◼ On HVAC vent in Office 105

◼ On HVAC vent in Lunchroom (B04)

The locations of the tape lift samples are presented in Exhibits 1 and 2 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.

2.5 Limited Asbestos Sampling

In additional to the moisture survey services, Terracon collected samples of building materials that may be impacted by microbial remediation activities. Based on results of the visual observation, bulk samples of suspect ACM were collected in accordance with the sampling protocols outlined in United States Environmental Protection Agency (USEPA) regulations under 40 Code of Federal Regulations Part 763-Asbestos, Subpart E-Asbestos-Containing

Materials in Schools (40 CFR 763; known as the Asbestos Hazard Emergency Response Act

[AHERA]). Samples of suspect materials were collected from randomly selected locations in each HA and were limited to materials that may be impacted by renovation and repair activities. Samples were placed in sealable containers and labeled with unique sample numbers using an indelible marker.

The selection of sample locations and frequency of sampling were based on Terracon’s observations and the assumption that like materials in the same area are homogeneous in content.

As part of this project, Terracon collected 8 bulk samples from four homogenous areas of suspect ACM. A summary of suspect ACM samples collected during the survey is included as part of the chain of custody (COC) presented in Appendix D.

Bulk samples were submitted under COC to EMSL Analytical, Inc. (EMSL) in Cinnaminson, New Jersey for analysis by polarized light microscopy (PLM) with dispersion staining techniques in accordance with USEPA’s Method for the Determination of Asbestos in Bulk

Building Materials (600/R-93-116). The percentage of asbestos, if present, was determined by microscopic visual estimation. EMSL is accredited under the National Voluntary Laboratory

Accreditation Program (NVLAP Accreditation No. 101048-0).

3.0 FINDINGS

This section includes the findings and a discussion of our physical inspection and sampling results. Appendix E 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 below the table and in subsequent sections.

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

Inspection Parameter Observation Comments

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.

Terracon did not perform an intrusive investigation in the building.

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 105, 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 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. Areas with apparent moisture impacted drywall are indicated on Exhibits 3 and 4 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

Southwest corner of west wall

Drywall 4”

(inches)

13.6 Dry

M-2 Just east of southern door, south wall

Drywall 4” 12.2 Dry

M-3 Southeast corner, east wall

Drywall 4” 12.8 Dry

M-4 Middle of eastern wall

Drywall 4” 13.6 Dry

M-5 Just north of internet outlet on east wall

Drywall

4” 18.2 Partially dry-caution

8” 18.8 Partially dry-caution

12” 12.2 Dry

M-6 3 feet south of northeastern corner, east wall

Drywall

4” 18.9 Partially dry-caution

8” 12.3 Dry

12” 13.6 Dry

M-7 Northeast corner of east wall

Drywall 4” 8.6 Dry

M-8 Middle of north wall Drywall 4” 13.2 Dry

M-9 Middle of west wall Drywall 4” 12.6 Dry

M-10 Ceiling tile above northern window

Ceiling tile

Ceiling 8.2 Dry

M-11 Ceiling tile above southern door

Ceiling tile

Ceiling 6.3 Dry

M-12 Ceiling above HVAC vent

Drywall Ceiling 9.2 Dry

M-13 Southwestern corner of ceiling

Drywall Ceiling 10.3 Dry

M-14 Above southern door on ceiling

Drywall Ceiling 8.6 Dry

M-15 Inside southern doorway

Carpet 0” 12.3 Dry

M-16 Northeastern corner of room

Carpet 0” 14.2 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-17

Office 108

Middle of east wall Drywall 4” 13.2 Dry

M-18 Middle of north wall Drywall 4” 12.6 Dry

M-19 Middle of west wall Drywall 4” 11.3 Dry

M-20 Middle of south wall Drywall 4” 8.2 Dry

M-21 Just east of bottom left window corner

Drywall

4’ (feet) 20.3 Wet

M-22 4’ 6” 20.2 Wet

M-23 5’ 13.6 Dry

M-24 1 foot east of bottom left window corner

Drywall 4’ 22.1 Wet

M-25 4’ 6” 12.2 Dry

M-26 Above southern window

Drywall 10’ 8.6 Dry

M-27 Ceiling Ceiling 8.2 Dry

M-28 Above northern doorway

Drywall Ceiling 6.3 Dry

M-29

Office 106

Southeastern corner of room

Drywall Ceiling 15.2 Partially dry-caution

M-30 Middle of room Drywall Ceiling 8.2 Dry

M-31 Middle of east wall Drywall 4” 10.2 Dry

M-32 Middle of west wall Drywall 4” 11.3 Dry

M-33 Middle of south wall Drywall 4” 12.6 Dry

M-34 Middle of north wall Drywall 4” 13.3 Dry

M-35

Office 105

Middle of east wall Drywall 4’ 13.6 Dry

M-36 Northwest corner of north wall

Drywall 4’ 12.4 Dry

M-37 Middle of south wall Drywall 12’ 12.2 Dry

M-38 Middle of west wall Drywall 4” 8.3 Dry

M-39 Inside doorway Drywall 4” 8.2 Dry

M-40 Middle of room Drywall 4” 9.6 Dry

M-41 Above northern light Drywall 4” 14.8 Dry

M-42 1 foot northeast of northern light

Drywall 4” 32.3 Wet

M-43

Men’s Restroom

Middle of west wall Drywall Ceiling 14.6 Dry

M-44 Middle of south wall Drywall Ceiling 13.2 Dry

M-45 Middle of east wall Drywall Ceiling 12.6 Dry

M-46 Middle of north wall Drywall Ceiling 11.3 Dry

M-47 Southwest corner of south wall

Drywall Ceiling 14.2 Dry

M-48 Office 102 Middle of east wall Drywall 4” 12.2 Dry

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading

Measure

Mode

WME1)

Interpretation2

M-49 Middle of north wall Drywall 4” 13.2 Dry

M-50 Middle of south wall Drywall 4” 14.2 Dry

M-51

2 feet east of southwest corner, on south wall

Drywall

4” 100 Wet

M-52 8” 100 Wet

M-53 16” 53.2 Wet

M-54 20” 16.3 Partially dry-caution

M-55 Southwest corner, west wall

Drywall

4” 100 Wet

M-56 20” 15.2 Partially dry-caution

M-57

Middle of west wall Drywall

4” 18.2 Partially dry-caution

M-58 8” 16.3 Partially dry-caution

M-59 20” 13.2 Dry

M-60

Northwest corner, west wall

Drywall

4” 19.6 Partially dry-caution

M-61 8” 16.5 Partially dry-caution

M-62 20” 12.2 Dry

M-63

Conference Room B02

Southeast corner, south wall

Drywall 4” 12.2 Dry

M-64 Middle of south wall Drywall 4” 8.3 Dry

M-65 Middle of east wall Drywall 4” 9.6 Dry

M-66 Middle of north wall Drywall 4” 10.2 Dry

M-67 Middle of west wall Drywall 4” 11.3 Dry

M-68 Northwest corner, north wall

Drywall 4” 8.3 Dry

M-69

Lunchroom B04

Middle of south wall Drywall 4” 10.2 Dry

M-70 Middle of north wall Drywall 4” 13.2 Dry

M-71 Middle of west wall Drywall 4” 14.2 Dry

M-72 Middle of east wall, under left window southern corner

Drywall

4” 100 Wet

M-73 8” 53.2 Wet

M-74 12” 13.2 Dry

M-75 Middle of east wall, under right window northern corner

Drywall

4” 100 Wet

M-76 8” 64.2 Wet

M-77 12” 12.6 Dry

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading

Measure

Mode

WME1)

Interpretation2

M-78 Ceiling tile in northeast corner

Ceiling tile

Ceiling 8.3 Dry

M-79 Ceiling tile in the middle of the west wall

Ceiling tile

Ceiling 8.6 Dry

M-80

Squad Room 114

Middle of north wall Drywall 4’ 14.2 Dry

M-81 Northeast corner, north wall

Drywall 4” 8.2 Dry

M-82 Northeast corner, east wall

Drywall 4” 10.2 Dry

M-83 Middle of east wall Drywall 4” 12.2 Dry

M-84 Jut out on east wall Drywall 4” 13.2 Dry

M-85 Southeast corner, south wall

Drywall 4” 10.6 Dry

M-86 Middle of south wall Drywall 4” 11.2 Dry

M-87 Southwest corner, west wall

Drywall 4” 11.3 Dry

M-88 Middle of west wall Ceiling

Tile 4” 12.2 Dry

M-89 North wall, northwest corner

Drywall 4’

14.2 Dry

M-90 Middle of east wall Ceiling tile Ceiling 11.2 Dry

M-91 Northeast corner Ceiling tile Ceiling 8.6 Dry

M-92 Southeast corner Ceiling tile Ceiling 9.2 Dry

M-93

Storage Room 115

Northeast corner Ceiling tile Ceiling 8.6 Dry

M-94 Middle of east wall Ceiling tile Ceiling 5.2 Dry

M-95 Middle of north wall Drywall 4” 8.2 Dry

M-96 Middle of south wall Drywall 4” 12.3 Dry

M-97 Middle of east wall Drywall 4” 13.6 Dry

M-98

Reception

Just west of north door

Drywall 4” 8.2 Dry

M-99 Southwest corner, west wall

Drywall 4” 9.6 Dry

M-100 Southwest corner, south wall

Drywall 4” 10.3 Dry

Location Number

Room Location

Description Material

Height above ground surface

Moisture Reading

Measure

Mode

WME1)

Interpretation2

M-101 Just west of south door

Drywall 4” 10.6 Dry

M-102 Just east of south door

Drywall 4” 11.2 Dry

M-103 Middle of south wall east of door

Drywall 4” 5.2 Dry

M-104

Entryway south of

Reception

Middle of north wall Drywall 4” 13.2 Dry

M-105 North of western doorway

Drywall 4” 12.6 Dry

M-106 Just west of northern doorway

Drywall 4” 12.4 Dry

M-107 Just east of northern doorway

Drywall 4” 12.2 Dry

M-108 Middle of south wall, east of door

Drywall 4” 12.3 Dry

M-109 Electrical

Room 124 Middle of west wall Drywall 4” 13.2 Dry

M-110

Theatre Room 116

Just above northeast door

Ceiling tile

Ceiling 10.3 Dry

M-111 Middle of east wall Ceiling tile Ceiling 11.2 Dry

M-112 Middle of room Ceiling tile Ceiling 8.6 Dry

M-113 Northwest corner of room

Ceiling tile

Ceiling 6.2 Dry

M-114 Middle of north wall Carpet 4” 8.2 Dry

M-115 Middle of west wall Carpet 4” 10.2 Dry

M-116 Middle of south wall Carpet 4” 11.3 Dry

M-117 Middle of east wall Carpet 4” 8.6 Dry

M-118 Just inside northeast door

Carpet 0” 9.2 Dry

M-119 5 feet west of northeast door

Carpet 0” 7.6 Dry

M-120 Middle of room Carpet 0” 13.2 Dry

M-121 Middle of north wall Carpet 0” 8.7 Dry

M-122

Display Room 118

Middle of room Ceiling tile Ceiling 5.6 Dry

M-123 Middle of north wall Drywall 4” 13.2 Dry

M-124 Middle of south wall Drywall 4” 8.6 Dry

M-125 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-126 Southeast corner, south wall

Drywall 4” 10.3 Dry

M-127

Office 123 – Lab Closet

Middle of north wall Drywall 4” 7.6 Dry

M-128 Middle of east wall Drywall 4” 6.2 Dry

M-129 Middle of south wall Drywall 4” 9.3 Dry

M-130 Middle of west wall Drywall 4” 10.2 Dry

M-131 Janitor’s

Closet 122 Middle of west wall Drywall 4” 11.3 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 21, 2022: high temperature of 96F, an average of 83F; clear skies; an average wind speed of 10 miles per hour from the southwest;

and a relative humidity average of 65%.

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, less the temperature readings in Display Room 118, Office 123, and Theatre Room 116, which were above the range ASHRAE considers optimal. 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 79.3°F 56.0%

Display Room 118, 5 feet north of southern wall, middle of room from east to west 85.3°F 45.2%

Display Room 118, 5 feet south of northern wall, middle of room from east to west 81.8°F 48.1%

Office 123, middle of room 80.7°F 53.1%

Theatre Room 116, middle of room 79.8°F 51.4%

Reception area 125, middle of room 78.2°F 52.3%

Squad Room 114, middle of room 76.1°F 53.0%

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

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

Location Temperature Relative Humidity

Office 102, middle of room 74.1°F 40.9%

Office 107, middle of room 69.6°F 44.6%

Conference Room B02, middle of room 68.7°F 49.8%

Lunchroom B04, middle of room 69.4°F 49.3%

Just outside of Lunchroom B04, on concrete landing 76.8°F 71.5%

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 Exhibits 1 and 2 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

T015 On HVAC vent in Office 105

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

Mold growth

T02 On HVAC vent in Lunchroom B04

Metal None Normal Trapping

Terracon understands that the microbial growth identified on the HVAC vent in 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 C. Photographic documentation is provided in

Appendix E.

3.5 Mold Spore Trap Sample Results

Terracon collected spore trap samples at 10 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).

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

5 This location was also sampled in Terracon’s Moisture and Microbial Investigation Report dated June 10, 2022

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)

3404 3772 E1 Exterior, 10 feet southeast of eastern building entrance to

Reception 125

7,300 Alternaria (160)

Ascospores (1,700)

Basidiospores (2,500)

Cladosporium (2,100)

Epicoccum (13)

Penicillium/Aspergillus types

(800)

Pithomyces (13)

Rusts (40)

Smuts, Periconia, Myxomycetes (27)

3404 3771 I1 Display Room

118, 5 feet north of southern wall, middle of room from east to west

3,400 Alternaria (27)

Ascospores (910)

Basidiospores (1,500)

Cladosporium (430)

Curvularia (13)

Epicoccum (13)

Penicillium/Aspergillus types

(430)

Smuts, Periconia, Myxomycetes (53)

3377 5489 I2 Display Room

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

2,800 Alternaria (40)

Ascospores (590)

Basidiospores (1,100)

Cladosporium (640)

Penicillium/Aspergillus types

(480)

Smuts, Periconia, Myxomycetes (27)

3404 3798 I3 Office 123, middle of room

2,100 Alternaria (13)

Ascospores (430)

Basidiospores (800)

Cladosporium (370)

Epicoccum (13)

Penicillium/Aspergillus types

(430)

Polythrinicium (13)

Smuts, Periconia, Myxomycetes (27)

Laboratory

Sample ID

Terracon

Sample

ID Sample Location

Total

Concentration

(spores/m3)

Mold Spore Types and

Concentrations (spores/m3)

3377 5226 I4 Theatre Room

116, middle of room

1,800 Alternaria (13)

Ascospores (320)

Basidiospores (480)

Cladosporium (320)

Penicillium/Aspergillus types

(690)

Smuts, Periconia, Myxomycetes (13)

3404 3913 I5 Reception area

125, middle of room

1,600 Ascospores (320)

Basidiospores (590)

Cladosporium (270)

Epicoccum (27)

Penicillium/Aspergillus types

(370)

Smuts, Periconia, Myxomycetes (13)

3404 3777 I6 Squad Room 114, middle of room

1,300 Ascospores (270)

Basidiospores (480)

Cladosporium (210)

Epicoccum (27)

Penicillium/Aspergillus types

(320)

Smuts, Periconia, Myxomycetes (13)

3404 3799 I7 Office 102, middle of room

1,900 Alternaria (13)

Ascospores (370)

Basidiospores (750)

Cladosporium (320)

Penicillium/Aspergillus types

(430)

Smuts, Periconia, Myxomycetes (13)

3404 3805 I8 Office 107, middle of room

1,900 Ascospores (430)

Basidiospores (800)

Cladosporium (320)

Epicoccum (13)

Penicillium/Aspergillus types

(370)

Myxomycetes (13)

Laboratory

Sample ID

Terracon

Sample

ID Sample Location

Total

Concentration

(spores/m3)

Mold Spore Types and

Concentrations (spores/m3)

3404 3788 I9 Conference Room

B02, middle of room

1,100 Alternaria (13)

Ascospores (210)

Basidiospores (370)

Cladosporium (210)

Penicillium/Aspergillus types

(320)

Smuts, Periconia, Myxomycetes (13)

3404 3795 I10 Lunchroom B04, middle of room

1,100 Ascospores (210)

Basidiospores (430)

Cladosporium (160)

Epicoccum (13)

Penicillium/Aspergillus types

(270)

Smuts, Periconia, Myxomycetes (13)

3404 3794 E2 Exterior, outside of Lunchroom

B04, on concrete landing

12,000 Alternaria (110)

Ascospores (4,100)

Basidiospores (5,500)

Bipolaris/Drechslera group (13)

Cladosporium (1,900)

Epicoccum (27)

Nigrospora (13)

Myxomycetes (53)

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 1,100 spores/m3 to 3,400 spores/m3.

2. The total outdoor mold spore concentrations were 7,300 spores/m3 and 12,000 spores/m3. The types of outdoor mold spores identified were considered by the analytical laboratory as typical for the outdoor environment and select mold spore types were in the high concentration range 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 E. 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.

3.6 Asbestos Sample Results

Asbestos was identified by the analytical laboratory in samples collected from the spray-applied texture associated with the plaster ceiling. Table 6 below presents the results of the asbestos survey. Photographic documentation is provided in Appendix E and the laboratory analytical results are included in Appendix D. Maps of the asbestos sample locations are provided in

Exhibit 1 in Appendix A. The area of asbestos containing spray-applied ceiling texture is presented in Exhibit 5 in Appendix A. The laboratory analytical report is presented in Appendix

D.

Table 6. Asbestos Survey Sample Summary by Homogeneous Area (HA)

HA6 Sample #

Material

Description

General

Location

Sample

Location

Description

Laboratory

Results

01-HP5-01

Spray-applied texture associated with plaster ceiling

Ceilings in Display

Area, Office 123, 121, 122, 120, and

Northwest corner of

Display Area

2% Chrysotile

01-HP5-02

Southeast corner of

Display Area

3% Chrysotile

01-HP5-03

Middle of north wall in Office

3% Chrysotile

01-HP5-04

Northwest corner of

Restroom 120

3% Chrysotile

01-HP5-05

Southwest corner in

Restroom 119

4% Chrysotile

6 HA = homogenous area.

HA6 Sample #

Material

Description

General

Location

Sample

Location

Description

Laboratory

Results

02-HP1-06

Plaster rough coat

Ceilings in

Display Area, Office 123, 121, 122, 120, and 119

Northwest corner of Display Area

None Detected

(ND)

Plaster skim coat

ND

02-HP1-07

Plaster rough coat

Southeast corner of Display Area

ND

Plaster skim coat ND

02-HP1-08

Plaster rough coat Middle of north wall in Office 123

ND

Plaster skim coat ND

4.0 CONCLUSIONS

Based on our June 21, 2022 investigation, our conclusions are presented below:

Moisture and Microbial Conclusions:

◼ The temperature readings collected in Display Room 118, Office 123, and

Theatre Room 116 were above the range ASHRAE considers optimal for office environments.

◼ 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 Office 105.

◼ Terracon did not observe mold growth in the duct work.

◼ Additionally, Terracon observed suspect visible biogrowth on the vents in

Women’s Restrooms 111 and 119.

◼ Saturated wallboard was observed in southwestern corner of Office 102, above the base cove, on the northeastern portion of the ceiling in Office 105, just east of the southern window frame in Office 108, and under the eastern windows in

Lunchroom B04.

◼ No visible mold was observed in the above referenced locations.

◼ Apparent water staining on ceiling tiles was noted in the following rooms. The ceiling tiles did not appear to be saturated 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).

Asbestos Conclusions

Asbestos was identified by the analytical laboratory in samples collected from the spray-applied texture associated with the plaster ceiling. The asbestos survey was limited to the plaster ceiling in the Display Area, Office 123, 121, 122, and Restrooms 119 and 120 as requested by Greenstone Construction, Inc. Asbestos may still be present in other materials in the building that were not sampled as part of this project. It is unknown if the asbestos containing ceiling texture will be impacted by future repairs / renovation.

5.0 RECOMMENDATIONS

Moisture and Microbial Recommendations

◼ Replace water-stained ceiling tiles.

◼ Lower the temperature in Display Room 118, Office 123, and Theatre Room

116 to be within the range ASHRAE considers optimal.

◼ Remove moisture impacted drywall. The location of the moisture impacted drywall are outlined on Exhibits 3 and 4 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.

◼ 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.

◼ 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.

◼ 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.

Asbestos Recommendations

At this time, it is unknown if the asbestos containing ceiling texture will be impacted as part of

Greenstone’s remedial efforts. If there will be impacts or disturbance to the asbestos containing ceiling texture, Terracon recommends that a qualified contractor be retained to properly abate and dispose the material accordance with local, state, and federal regulations. A summary of applicable asbestos regulations are included in Appendix F.

The owner and/or operator are responsible for NESHAP regulatory compliance regarding the proper removal, handling, and disposal of ACMs containing greater than 1% asbestos prior to renovation or demolition. Also, per state regulations, please be aware that the owner and/or operator must notify the Iowa Department of Natural Resources (IDNR) 10-business days prior to asbestos abatement at certain quantity thresholds and prior to renovation activities.

The reader of this report should understand the limitations of this survey. Laboratory results of samples collected from within the project area should not be extrapolated to other areas of the building unless a licensed asbestos inspector as determined the materials to be homogenous. If the project area as defined in this report or renovation plans change, additional assessment of previously unsampled suspect ACMs may be necessary.

If additional but unsampled suspect ACMs are revealed during renovation or demolition activities, the material(s) must be assumed to contain asbestos and treated as such unless sampled by an accredited inspector and laboratory analysis determines otherwise.

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

July 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

July 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

1st Floor 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

July 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

Basement 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

July 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

1st Floor Asbestos 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

July 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

Microbial Laboratory Reports and COCs

Approved by:

Technical Manager Ariunaa Jalsrai

Report for:

Mr. Eric Harris Terracon, Cedar Rapids 2640 12th St SW Cedar Rapids, IA 52404

Regarding: Project: 06227092; USACE Admin Building

EML ID: 2958661

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): 06-24-2022

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: 2958661, 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: Mr. Eric Harris Re: 06227092; USACE Admin Building

Date of Sampling: 06-21-2022 Date of Receipt: 06-22-2022 Date of Report: 06-24-2022

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‡: 14224925-1, Analysis Date: 06/24/2022: Tape sample T01: Air Vent in 105

Moderate Very few 4+ Cladosporium species (spores, hyphae, conidiophores)

None Mold growth

Lab ID-Version: 14224926-1, Analysis Date: 06/24/2022: Tape sample T02: Air Cent in B04

Moderate 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: 2958661, Page 2 of 2Eurofins EPK Built Environment Testing, LLC

Approved by:

Technical Manager Ariunaa Jalsrai

Report for:

Mr. Eric Harris Terracon, Cedar Rapids 2640 12th St SW Cedar Rapids, IA 52404

Regarding: Project: 06227092; USACE Admin Building

EML ID: 2958661

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: 06-24-2022

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: 2958661, Page 1 of 7Eurofins EPK Built Environment Testing, LLC

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

Date of Sampling: 06-21-2022 Date of Receipt: 06-22-2022 Date of Report: 06-24-2022

SPORE TRAP REPORT: NON-VIABLE METHODOLOGY

Location: 3404 3772:

Exterior, Southeast of Recpetion 3404 3771:

South Display Area 118 Comments (see below) None None

Lab ID-Version‡: 14224927-1 14224928-1

Analysis Date: 06/24/2022 06/24/2022 raw ct. % read spores/m3 raw ct. % read spores/m3 Alternaria 12 100 160 2 100 27 Ascospores 31 25 1,700 17 25 910 Basidiospores 47 25 2,500 29 25 1,500 Bipolaris/Drechslera group Chaetomium Cladosporium 39 25 2,100 8 25 430 Curvularia 1 100 13 Epicoccum 1 100 13 1 100 13 Nigrospora Other colorless Penicillium/Aspergillus types† 15 25 800 8 25 430 Pithomyces 1 100 13 Polythrincium Rusts 3 100 40 Smuts, Periconia, Myxomycetes 2 100 27 4 100 53 Stachybotrys Stemphylium Torula Ulocladium Zygomycetes Background debris (1-4+)†† 3+ 2+ Hyphal fragments/m3 < 13 < 13 Pollen/m3 < 13 < 13 Skin cells (1-4+) < 1+ 2+ Sample volume (liters) 75 75 § TOTAL SPORES/m3 7,300 3,400 Comments:

EMLab ID: 2958661, Page 2 of 7Eurofins 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"…