Via . September 5, City of Charlotte Engineering & Property Management 600 E. 4 th Street, 12 th Floor Charlotte, NC

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1 Via September 5, 2014 City of Charlotte Engineering & Property Management 600 E. 4 th Street, 12 th Floor Charlotte, NC Attention: Mr. David Wolfe, PE Re: Moisture Screening and Mold Air Sampling 1517 North Graham Street Charlotte, North Carolina H&H Job No. CLT-505 Dear David: 1.0 Introduction Per your request, Hart & Hickman, PC (H&H) has completed moisture screening and mold air sampling activities for the office/warehouse building located at 1517 North Graham Street in Charlotte, NC. A site location map is included as Figure 1, and a site map is included as Figure 2. The purpose of these activities was to evaluate current indoor air quality (IAQ) conditions and to identify potential moisture and/or water intrusion issues (if present). The moisture screening and mold air sampling activities consisted of the following tasks: 1. Visual survey of interior surfaces of the office/warehouse building for evidence of mold growth, moisture, and/or water intrusion issues 2. Collecting and recording moisture readings from interior building surfaces 3. Collecting area mold spore trap air samples 4. Data interpretation/evaluation and report preparation

2 Mr. David Wolfe, PE September 5, 2014 Page 2 The methods and results of our August 18, 2014 moisture screening and mold air sampling activities are discussed in further detail in the following sections. 2.0 Visual Survey and Moisture Screening 2.1 Visual Survey On August 18, 2014, H&H performed a visual survey of the accessible interior spaces of the office/warehouse building to evaluate if visible mold is present and to determine if moisture issues are present within the interior spaces of the office/warehouse building. The three story building is approximately 34,340 square ft in size, and is constructed of masonry (i.e., brick and concrete block) built atop a concrete slab foundation. The first and second floors generally consist of office and/or office related spaces with the exception of an approximate 2,500 square ft warehouse area and associated loading dock on the first floor. The basement level generally consists of warehouse areas, a boiler room, and a truck access ramp/well. The floor plan of each floor is shown in Figure 3. With the exception of water on the concrete floor of the basement and flaking paint on the interior surfaces of the basement walls, the interior surfaces of the office/warehouse appeared dry with no evidence of visual mold growth. H&H observed water on the surface of the concrete floor adjacent to the boiler room in the southeastern portion of the basement (Photograph 1). The water on the basement floor was determined to be related to boiler maintenance/disassembly activities which were being performed at the time of our site visit. H&H observed maintenance personnel vacuuming the boiler water from the floor using wet-vacuums and drying the floor using industrial floor fans. No evidence of mold growth was observed in association with the boiler water on the concrete floor of the basement. As mentioned above, H&H observed evidence of flaking paint on the interior surfaces of the concrete block walls of the basement. The flaking paint was most notable along the northern, S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

3 Mr. David Wolfe, PE September 5, 2014 Page 3 northwestern, and northeastern walls of the basement, and the primary area of flaking paint was observed near the northwest corner in the vicinity of multiple sets of at-grade windows (Photograph 2). The evidence of flaking paint could be an indication that moisture has penetrated through the concrete block wall or could be an indication that the walls were not properly primed prior to painting. H&H observed the accessible exterior surface of the brick wall in the vicinity of the windows and did not observe evidence of obvious sheet flow or water staining on the exterior surface of the brick. However, H&H noted that the ground surface in the vicinity of the windows is sloped toward the building which could lead to potential water intrusion issues in the basement (Photograph 3). The windows in the basement are located beneath an elevated concrete pad located along the northwestern corner of the building (Photograph 4). In addition, H&H observed evidence of prior water staining on the surface of a few drop tile ceiling tiles in the office areas of the first floor. However, no evidence of mold growth was observed on the surfaces of the ceiling tiles. 2.2 Moisture Screening and Results To further evaluate the potential for moisture and/or water intrusion issues, H&H collected and recorded moisture readings from interior building surfaces of the office/warehouse building on August 18, The moisture screening was conducted using a hand-held GE Surveymaster Protimeter Moisture Meter (PMM). The PMM is a pin-type probe that measures percent moisture content (% MC) in wood materials and percent wood moisture equivalent (% WME) in non-conductive solid materials other than wood. The measured moisture value is displayed on the hand-held meter and indicates whether the material is in a dry, at risk, or wet condition as listed below. Reading greater than or equal to 8%, but less than 17% are considered to be dry. Readings greater than or equal to 17%, but less than 20% are considered to be at risk. S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

4 Mr. David Wolfe, PE September 5, 2014 Page 4 Readings greater than or equal to 20%, but less than 28% are considered to be wet. The results of the moisture screening indicate two wet and one at risk conditions in the vicinity of the at-grade windows near the northwest corner of the basement, one at risk condition near the southwest corner of the basement, two at risk conditions along the southern wall of the basement, and one at risk condition near the northeast corner of the basement. The moisture readings on the first and second floors of the office/warehouse building were within the range of 8% to 17% indicating conditions considered to be dry. Moisture readings for the basement level are shown on Figure 3. Based on the data above, it appears that moisture is penetrating the concrete block wall of the basement in the vicinity of the at-grade windows near the northwest corner of the building. Based on the evidence of flaking paint and several other at risk moisture readings, it appears that moisture is likely present or has been present along the southern wall and near the northeast and southwest corners of the basement. 3.0 Mold Air Sampling 3.1 Mold Air Sampling To evaluate the potential for elevated mold levels, H&H collected eleven Air-O-Cell spore trap air samples on August 18, 2014 for laboratory analysis of fungal spores and particulates utilizing optical microscopy. The spore trap samples were collected using a laboratory calibrated Zefon Bio-Pump and laboratory-supplied sampling media. The spore trap samples were collected over a 5-minute sample interval with a flow rate of 15 liters per minute. The spore trap samples were collected at a height of approximately 4 to 5 ft above the floor level at each sampling location by placing the Zefon Bio-Pump on a tripod. Three spore trap samples (labeled IAS-1 through IAS-3) were collected from air-conditioned office areas on the second floor. Three additional spore trap samples (labeled IAS-3 through IAS-6) were collected from the first floor. S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

5 Mr. David Wolfe, PE September 5, 2014 Page 5 Two of these samples IAS-4 and IAS-6 were collected within air-conditioned spaces, and the third sample IAS-5 was collected within the unconditioned warehouse area located adjacent to office areas. Three additional spore trap samples (labeled IAS-7 through IAS-9) were collected from the unconditioned spaces in the basement warehouse area. To compare indoor air quality to outdoor ambient air quality, two background spore trap samples (labeled OAS-1 and OAS-2) were collected from exterior locations adjacent to the building s entrance. The exterior sample locations were selected to be upwind of the building s fresh air intake to obtain a general sense of outdoor fungal spore concentrations and to assess the potential for infiltration of fungal spores from outdoor sources. The indoor and outdoor air sample locations are shown on Figure 3. Typical photographs of the indoor and outdoor sampling locations are included as Photographs 5 through 8 in Appendix A. The collected samples were sealed with a chain-of-custody label, packaged, and delivered to EMSL Analytical Laboratories, Inc. of Charlotte, North Carolina (an American Industrial Hygiene Association (AIHA)-accredited Environmental Microbiology laboratory) for laboratory analysis of fungal spores and particulates utilizing optical microscopy (EMSL Method 05-TP- 003, ASTM D7391). Standards for judging what is an acceptable, tolerable or normal quantity of mold have not been established. Therefore, the indoor spore trap sample results were initially compared to the results of the outdoor spore trap sample to determine if elevated levels of mold spores were present in the interior spaces of the building. To further evaluate the data, H&H considered the presence or absence of certain mold spore indoors versus outdoors and/or the genus of the predominant mold type indoors versus outdoors. 3.2 Mold Air Sampling Results A summary of the mold air results is presented in Table 1. A copy of the laboratory analytical report is provided in Appendix B. Results of the spore trap samples indicate that mold spores are S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

6 Mr. David Wolfe, PE September 5, 2014 Page 6 present in indoor and outdoor air at the site which is typical. Compared to the outdoor samples (OAS-1 and OAS-2), the total spore counts reported in the air samples collected from airconditioned sample locations were significantly lower than background levels. For example, the total spore counts reported in indoor air samples collected from the air-conditioned office spaces were in the range of 480 and 2,940 counts/m 3 as compared to the background range of 15,440 to 22,020 counts/m 3 reported in the outdoor air samples. Similar total spore counts were reported in the other indoor air samples collected from air-conditioned spaces with the exception of IAS-1 which was determined by the laboratory to be overloaded with background particulates. The sample overloading condition in IAS-1 was likely caused by airborne dust and particulate debris generated by the renovation activities which were occurring near this location at the time of our sampling. In sample IAS-1, the laboratory identified the presence of Ascospores, Aspergillus/Penicillium, and insect fragments. However, no further detections or quantification were reported. With the exception of one sample (IAS-5), the total spore counts reported in indoor air samples collected from unconditioned locations were lower than background levels. For example, the total spore counts reported in unconditioned indoor air samples (IAS-7, IAS-8, and IAS-9) were 12,550, 10,610, and 14,840 counts/m 3 as compared to the background range of 15,440 to 22,020 counts/m 3 reported in the outdoor air samples. In IAS-5, the total spore count was reported at 25,400 counts/m 3 which is higher but similar to levels reported in outdoor air (15,440 to 22,020 counts/m 3 ). As compared to indoor levels in air-conditioned sample locations, the total spore counts for indoor samples collected from unconditioned locations were three to eight times higher than those reported in air-conditioned sample locations. Potentially elevated levels of Aspergillus/Penicillium fungal spores were reported in IAS-5 (3,700 counts/m 3 ) and IAS-8 (7,090 counts/m 3 ) collected from unconditioned locations on the first floor and basement, respectively. The detection of Aspergillus/Penicillium and certain other S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

7 Mr. David Wolfe, PE September 5, 2014 Page 7 indicator fungi can indicate a potential mold amplification problem in certain scenarios. However, it should be noted that IAS-5 and IAS-8 were collected from unconditioned warehouse locations in close proximity to rollup garage door that were open for an extended period of time immediately prior to our sampling activities. As a result, the potentially elevated levels of Aspergillus/Penicillium fungal spores could be attributed to the variability of spore count during the outdoor sample collection. Additional spore trap sampling with the building s exterior doors closed for an extended period of time would be necessary to confirm that elevated mold spore levels are not present. Several other genera of fungi (Alternaria, Ascospores, Basidiospores, Bipolaris, Chaetomium, Cladosporium, Fusarium, Ganoderma, Myxomycetes, Pithomyces, Stachybotrys, Torula, Cercospora, Nigrospora, and Pestalotia) were reported in the indoor spore trap samples. However, these fungi were either reported at low concentrations or are consistent with the reported outdoor (background) concentrations. Therefore, H&H does not believe these detections represent a significant airborne elevation or amplification concern. 4.0 Conclusions and Recommendations H&H conducted mold screening and mold air sampling activities at the office/warehouse building located at 1517 North Graham Street on August 18, The results of the moisture screening and mold air sampling activities indicate the following: The interior surfaces of the office/warehouse appeared dry with the exception of water on the concrete floor of the basement and flaking paint on the interior surfaces of the basement walls. The flaking paint particularly in the northwest corner is an indicator of a moisture problem and high moisture readings were detected on this wall. H&H noted that the ground surface in the vicinity of the windows is sloped toward the building which could lead to potential water intrusion issues in the basement. There was no visual mold growth observed on the interior surfaces during the site visit. S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

8 Mr. David Wolfe, PE September 5, 2014 Page 8 Results of the spore trap samples indicate that mold spores are present in indoor and outdoor air at the site which is typical. Compared to the outdoor samples, the total spore counts reported in the air samples collected from air-conditioned sample locations were significantly lower than outdoor levels. Although the conditioned space mold spore counts were lower than outdoor levels, they are relatively high based on H&H experience and published screening levels. With the exception of one sample (IAS-5), the total spore counts reported in indoor air samples collected from unconditioned locations were lower than background levels. In IAS-5, the total spore count was reported at 25,400 counts/m 3 which is higher but similar to levels reported in outdoor air. The mold spore counts for unconditioned locations may indicate elevated mold levels. Potentially elevated levels of Aspergillus/Penicillium fungal spores were reported in indoor samples IAS-5 (3,700 counts/m 3 ) and IAS-8 (7,090 counts/m 3 ). The detection of Aspergillus/Penicillium and certain other indicator fungi can indicate a potential mold amplification problem in certain scenarios. However, it should be noted that IAS-5 and IAS-8 were collected from unconditioned warehouse locations in close proximity to rollup garage door that were open for an extended period of time immediately prior to our sampling activities. As a result, the potentially elevated levels of Aspergillus/Penicillium fungal spores could be attributed to the variability of spore count during the outdoor sample collection. Additional spore trap sampling with the building s exterior doors closed for an extended period of time would be necessary to confirm that elevated mold spore levels are not present. Based upon the data above, H&H recommends that additional mold spore trap sampling be conducted to confirm that elevated mold spore levels are not present. Prior to the additional spore trap sampling, H&H initially recommends that the building renovation activities be completed. Following completion of the renovation activities, a custodial cleaning of the interior S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

9 Mr. David Wolfe, PE September 5, 2014 Page 9 building surfaces should be performed using high-efficiency particulate air (HEPA) vacuums and wet-wiping techniques using fungicides. Additionally, H&H recommends that the building s HVAC system be operated utilizing quality HEPA pre-filters and that the filters be changed multiple times during this period. Following these measures, the additional spore trap sampling should be conducted. Thank you for the opportunity to provide you with environmental services. Please contact us if you have questions or require further assistance. Very truly yours, Hart & Hickman, PC Shannon Cottrill Project Manager and Mold Remediation Professional Matt Bramblett Principal and Project Manager Attachments cc: Mr. Ricky Barksdale (City of Charlotte) (Via ) S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Air Sampling Report.docx

10 Table 1 (Page 1 of 2) Summary of Analytical Results - Mold Air Samples 1517 North Graham Street Charlotte, North Carolina H&H Job No. CLT-505 Sample Identification Volume (Liters) Sample Location IAS-1 Second Floor IAS-2 Second Floor IAS-3 Second Floor IAS-4 First Floor IAS-5 First Floor IAS-6 First Floor Spore Types Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Alternaria Ascospores Present Present Aspergillus/Penicillium Present Present Basidiospores Bipolaris Chaetomium Cladosporium Curvularia Fusarium Ganoderma Myxomycetes * 30* Pithomyces Rust Stachybotrys Torula Unidentifiable Spores Cercospora Nigrospora Pestalotia Polythrincium Total Fungi Hyphal Fragment Insect Fragment Present Present Pollen * 10* Analtyical Sensitivity 600x Analtyical Sensitivity 300x -- 13* * * * * * -- Skin Fragments (1-4) Fibrous Particulate (1-4) Background (1-5) Notes: Samples collected by H&H on August 18, 2014 and analyzed by EMSL of Charlotte, NC for Fungal Spores & Particulates by Optical Microscopy (Method EMSL 05-TP-003, ASTM D7391) Only spore detected in at least one sample are shown above Bipolaris++ = Bipolaris/Drehslera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut Background levels of 5 indicate an overloading of background particulates, prohibiting accurate detection and quantification Present = Spores detected on overloaded samples * = Denotes particles found at 300X -- = Not Detected File:S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Data Date:9/3/2014 Table 1 (Page 1 of 2) Hart & Hickman, PC

11 Table 1 (Page 2 of 2) Summary of Analytical Results - Mold Air Samples 1517 North Graham Street Charlotte, North Carolina H&H Job No. CLT-505 Sample Identification Volume (Liters) Sample Location Spore Types Alternaria Ascospores Aspergillus/Penicillium Basidiospores Bipolaris++ Chaetomium Cladosporium Curvularia Fusarium Ganoderma Myxomycetes++ Pithomyces Rust Stachybotrys Torula Unidentifiable Spores Cercospora Nigrospora Pestalotia Polythrincium Total Fungi Hyphal Fragment Insect Fragment Pollen Analtyical Sensitivity 600x Analtyical Sensitivity 300x Skin Fragments (1-4) Fibrous Particulate (1-4) Background (1-5) IAS-7 IAS-8 IAS-9 OAS-1 OAS-2 Basement Basement Basement Outdoor/Background Outdoor/Background Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total Raw Count Count/m 3 % of Total * 10* * 10* * 10* * 10* 0 2* 30* * 10* 0.1 2* 30* * 80* 0.5 2* 30* * 10* 0.1 1* 10* 0 1* 10* * 10* * 30* * 10* * * * * * Notes: Samples collected by H&H on August 18, 2014 and analyzed by EMSL of Charlotte, NC for Fungal Spores & Particulates by Optical Microscopy (Method EMSL 05-TP-003, ASTM D7391) Only spore detected in at least one sample are shown above Bipolaris++ = Bipolaris/Drehslera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut Background levels of 5 indicate an overloading of background particulates, prohibiting accurate detection and quantification Present = Spores detected on overloaded samples * = Denotes particles found at 300X -- = Not Detected File:S:\AAA-Master Projects\City of Charlotte - CLT\CLT-500s\CLT N Graham Mold & Asbestos\Mold\Mold Data Date:9/3/2014 Table 1 (Page 2 of 2) Hart & Hickman, PC

12 SITE N APPROXIMATE SCALE IN FEET TITLE PROJECT SITE LOCATION MAP 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA U.S.G.S. QUADRANGLE MAP Charlotte East, NC 1967 Photorevised 1991 QUADRANGLE 7.5 MINUTE SERIES (TOPOGRAPHIC) DATE: JOB NO: REVISION NO: 0 CLT-505 FIGURE: 1

13 SITE TITLE SITE MAP PROJECT 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA Property Boundary Photo Source: Google Earth, 2014 Scale (1 Inch = 424 ft) N DATE: REVISION NO: 0 JOB NO: CLT-505 FIGURE: 1

14 Office Areas Office Areas IAS-2 IAS-3 Office Areas Office Areas IAS-1 FLOOR PLAN/SECOND FLOOR (Not to Scale) LEGEND Indoor Air Sample Location CLT-505 FIGURE 3 (1 of 3) 2923 S. Tryon Street, Suite 100 Charlotte, NC (p) (f) Notes: 1. Moisture readings on the second floor were within the range of 8 to 17% indicating conditions considered to be dry. 2. New wall construction is shown in blue 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA

15 Warehouse Area IAS-5 Office Areas IAS-4 Office Areas IAS-6 Office Areas OAS-2 OAS-1 FLOOR PLAN/FIRST FLOOR (Not to Scale) LEGEND Indoor Air Sample Location FIGURE 3 (2 of 3) Outdoor/Background Air Sample Location Note: Moisture readings on the first floor were within the range of 8 to 17% indicating conditions considered to be dry. CLT S. Tryon Street, Suite 100 Charlotte, NC (p) (f) 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA

16 19% WME 4 ft above floor 17% WME 8 ft above floor 12.3% WME 10 ft above floor Small patches of flaking paint along northwestern wall Warehouse Area IAS-7 Primary area of flaking paint along northern wall 22% WME - at window sill 11.6% WME - 1 ft below window sill 18.5% WME 2 ft below window sill 20.5% WME 4 ft above floor 16.5% WME 8 ft above floor 14.5% WME 10 ft above floor IAS % WME 4 ft above floor 19% WME 6 ft above floor 15.3% WME - 7 ft above floor Warehouse Area IAS-8 Boiler Room Area of water on the concrete floor adjacent to boiler room Small patches of flaking paint along southeastern wall 18.5% WME - 4 ft above floor 17% WME - 4 ft above floor FLOOR PLAN/BASEMENT (Not to Scale) LEGEND Indoor Air Sample Location FIGURE 3 (3 of 3) Notes: 1. Moisture readings shown in red are in the range of 20 to 28% indicating conditions considered to be wet. 2. Moisture readings shown in orange are in the range of 17 to 20% indicating conditions considered to be at risk. 3. Moisture readings shown in green are in the range of 8 to 17% indicating conditions considered to be dry. CLT S. Tryon Street, Suite 100 Charlotte, NC (p) (f) 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA

17 Appendix A Site Photographs

18 Photograph 1: Boiler water on the surface of the concrete floor in the basement (as indicated by the yellow arrow). Photograph 2: Flaking paint on the interior surfaces of the concrete block wall near the windows at northwest corner of the basement (as indicated by the yellow arrow). CLT S. Tryon Street, Suite 100 Charlotte, NC (p) (f) 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA

19 Photograph 3: Ground surface in the vicinity of the basement windows is sloped toward the building. Photograph 4: Basement windows are located beneath an elevated concrete pad along the northwest corner of the building. CLT S. Tryon Street, Suite 100 Charlotte, NC (p) (f) 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA

20 Photograph 5: Typical view of indoor air sample location on the second floor (sample IAS-2 location is shown). Photograph 6: View of indoor air sample location IAS-5 in the warehouse on the first floor. CLT S. Tryon Street, Suite 100 Charlotte, NC (p) (f) 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA

21 Photograph 7: View of indoor air sample location IAS-7 in the warehouse area of the basement. Photograph 8: View of outdoor air sample location OAS-1 located south of the building entrance. CLT S. Tryon Street, Suite 100 Charlotte, NC (p) (f) 1517 NORTH GRAHAM STREET CHARLOTTE, NORTH CAROLINA

22 Appendix B Laboratory Analytical Report

23 EMSL Analytical, Inc. 376 Crompton Street Charlotte, NC Phone/Fax: (704) / (704) / charlottelab@emsl.com Order ID: Customer ID: Customer PO: Project ID: TURN51 Attn: Proj: JC Weaver Hart & Hickman 2923 S. Tryon Street Suite 100 Charlotte, NC Phone: (704) Fax: () - Collected: 08/18/2014 Received: 08/18/2014 Analyzed: 08/19/2014 Test Report: Air-O-Cell( ) Analysis of Fungal Spores & Particulates by Optical Microscopy (Methods EMSL 05-TP-003, ASTM D7391) Lab Sample Number: Client Sample ID: Volume (L): Sample Location: IAS IAS IAS 3 Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria Ascospores Present Present Aspergillus/Penicillium Present Present Basidiospores Bipolaris Chaetomium Cladosporium Curvularia Epicoccum Fusarium Ganoderma Myxomycetes Pithomyces Rust Scopulariopsis Stachybotrys Torula Unidentifiable Spores Cercospora Nigrospora Pestalotia Polythrincium Total Fungi Hyphal Fragment Insect Fragment Present Present Pollen * 10* Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 13* * * - Skin Fragments (1-4) Fibrous Particulate (1-4) Background (1-5) Sample Comments: Overloaded Bipolaris++ = Bipolaris/Drechslera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut No discernable field blank was submitted with this group of samples. Lee Plumley, Laboratory Manager or Other Approved Signatory High levels of background particulate can obscure spores and other particulates leading to underestimation. Background levels of 5 indicate an overloading of background particulates, prohibiting accurate detection and quantification. Present = Spores detected on overloaded samples. Results are not blank corrected unless otherwise noted. The detection limit is equal to one fungal spore, structure, pollen, fiber particle or insect fragment. "*" Denotes particles found at 300X. "-" Denotes not detected. Due to method stopping rules, raw counts in excess of 100 are extrapolated based on the percentage analyzed. EMSL maintains liability limited to cost of analysis. This report relates only to the samples reported above and may not be reproduced, except in full, without written approval by EMSL. EMSL bears no responsibility for sample collection activities or analytical method limitations. Interpretation and use of test results are the responsibility of the client. Samples received in good condition unless otherwise noted. Samples analyzed by EMSL Analytical, Inc. Charlotte, NC AIHA-LAP, LLC - EMLAP Initial report from: 08/20/ :02:21 For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 8/20/ :02:21AM Page 1 of 4

24 EMSL Analytical, Inc. 376 Crompton Street Charlotte, NC Phone/Fax: (704) / (704) / charlottelab@emsl.com Order ID: Customer ID: Customer PO: Project ID: TURN51 Attn: Proj: JC Weaver Hart & Hickman 2923 S. Tryon Street Suite 100 Charlotte, NC Phone: (704) Fax: () - Collected: 08/18/2014 Received: 08/18/2014 Analyzed: 08/19/2014 Test Report: Air-O-Cell( ) Analysis of Fungal Spores & Particulates by Optical Microscopy (Methods EMSL 05-TP-003, ASTM D7391) Lab Sample Number: Client Sample ID: Volume (L): Sample Location: IAS IAS IAS 6 Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria Ascospores Aspergillus/Penicillium Basidiospores Bipolaris Chaetomium Cladosporium Curvularia Epicoccum Fusarium Ganoderma Myxomycetes * 30* Pithomyces Rust Scopulariopsis Stachybotrys Torula Unidentifiable Spores Cercospora Nigrospora Pestalotia Polythrincium Total Fungi Hyphal Fragment Insect Fragment Pollen Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 13* * * - Skin Fragments (1-4) Fibrous Particulate (1-4) Background (1-5) Bipolaris++ = Bipolaris/Drechslera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut No discernable field blank was submitted with this group of samples. Lee Plumley, Laboratory Manager or Other Approved Signatory High levels of background particulate can obscure spores and other particulates leading to underestimation. Background levels of 5 indicate an overloading of background particulates, prohibiting accurate detection and quantification. Present = Spores detected on overloaded samples. Results are not blank corrected unless otherwise noted. The detection limit is equal to one fungal spore, structure, pollen, fiber particle or insect fragment. "*" Denotes particles found at 300X. "-" Denotes not detected. Due to method stopping rules, raw counts in excess of 100 are extrapolated based on the percentage analyzed. EMSL maintains liability limited to cost of analysis. This report relates only to the samples reported above and may not be reproduced, except in full, without written approval by EMSL. EMSL bears no responsibility for sample collection activities or analytical method limitations. Interpretation and use of test results are the responsibility of the client. Samples received in good condition unless otherwise noted. Samples analyzed by EMSL Analytical, Inc. Charlotte, NC AIHA-LAP, LLC - EMLAP Initial report from: 08/20/ :02:21 For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 8/20/ :02:21AM Page 2 of 4

25 EMSL Analytical, Inc. 376 Crompton Street Charlotte, NC Phone/Fax: (704) / (704) / charlottelab@emsl.com Order ID: Customer ID: Customer PO: Project ID: TURN51 Attn: Proj: JC Weaver Hart & Hickman 2923 S. Tryon Street Suite 100 Charlotte, NC Phone: (704) Fax: () - Collected: 08/18/2014 Received: 08/18/2014 Analyzed: 08/19/2014 Test Report: Air-O-Cell( ) Analysis of Fungal Spores & Particulates by Optical Microscopy (Methods EMSL 05-TP-003, ASTM D7391) Lab Sample Number: Client Sample ID: Volume (L): Sample Location: IAS IAS IAS 9 Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria Ascospores Aspergillus/Penicillium Basidiospores Bipolaris Chaetomium Cladosporium Curvularia Epicoccum Fusarium Ganoderma * 10* Myxomycetes Pithomyces Rust Scopulariopsis Stachybotrys Torula * 10* 0.1 2* 30* 0.2 Unidentifiable Spores Cercospora 2* 30* * 10* 0.1 Nigrospora Pestalotia Polythrincium Total Fungi Hyphal Fragment Insect Fragment 2* 30* Pollen Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 13* * * - Skin Fragments (1-4) Fibrous Particulate (1-4) Background (1-5) Bipolaris++ = Bipolaris/Drechslera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut No discernable field blank was submitted with this group of samples. Lee Plumley, Laboratory Manager or Other Approved Signatory High levels of background particulate can obscure spores and other particulates leading to underestimation. Background levels of 5 indicate an overloading of background particulates, prohibiting accurate detection and quantification. Present = Spores detected on overloaded samples. Results are not blank corrected unless otherwise noted. The detection limit is equal to one fungal spore, structure, pollen, fiber particle or insect fragment. "*" Denotes particles found at 300X. "-" Denotes not detected. Due to method stopping rules, raw counts in excess of 100 are extrapolated based on the percentage analyzed. EMSL maintains liability limited to cost of analysis. This report relates only to the samples reported above and may not be reproduced, except in full, without written approval by EMSL. EMSL bears no responsibility for sample collection activities or analytical method limitations. Interpretation and use of test results are the responsibility of the client. Samples received in good condition unless otherwise noted. Samples analyzed by EMSL Analytical, Inc. Charlotte, NC AIHA-LAP, LLC - EMLAP Initial report from: 08/20/ :02:21 For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 8/20/ :02:21AM Page 3 of 4

26 EMSL Analytical, Inc. 376 Crompton Street Charlotte, NC Phone/Fax: (704) / (704) / charlottelab@emsl.com Order ID: Customer ID: Customer PO: Project ID: TURN51 Attn: Proj: JC Weaver Hart & Hickman 2923 S. Tryon Street Suite 100 Charlotte, NC Phone: (704) Fax: () - Collected: 08/18/2014 Received: 08/18/2014 Analyzed: 08/19/2014 Test Report: Air-O-Cell( ) Analysis of Fungal Spores & Particulates by Optical Microscopy (Methods EMSL 05-TP-003, ASTM D7391) Lab Sample Number: Client Sample ID: Volume (L): Sample Location: OAS OAS Dummy Dummy Dummy Spore Types Raw Count Count/m³ % of Total Raw Count Count/m³ % of Total Alternaria * 10* Ascospores Aspergillus/Penicillium Basidiospores Bipolaris Chaetomium Cladosporium Curvularia Epicoccum Fusarium * 10* Ganoderma Myxomycetes++ 1* 10* 0 2* 30* Pithomyces Rust Scopulariopsis Stachybotrys Torula Unidentifiable Spores * 80* Cercospora 1* 10* 0 1* 10* Nigrospora Pestalotia Polythrincium * 10* Total Fungi Hyphal Fragment Insect Fragment Pollen * 10* Analyt. Sensitivity 600x Analyt. Sensitivity 300x - 13* * Skin Fragments (1-4) Fibrous Particulate (1-4) Background (1-5) Bipolaris++ = Bipolaris/Drechslera/Exserohilum Myxomycetes++ = Myxomycetes/Periconia/Smut No discernable field blank was submitted with this group of samples. Lee Plumley, Laboratory Manager or Other Approved Signatory High levels of background particulate can obscure spores and other particulates leading to underestimation. Background levels of 5 indicate an overloading of background particulates, prohibiting accurate detection and quantification. Present = Spores detected on overloaded samples. Results are not blank corrected unless otherwise noted. The detection limit is equal to one fungal spore, structure, pollen, fiber particle or insect fragment. "*" Denotes particles found at 300X. "-" Denotes not detected. Due to method stopping rules, raw counts in excess of 100 are extrapolated based on the percentage analyzed. EMSL maintains liability limited to cost of analysis. This report relates only to the samples reported above and may not be reproduced, except in full, without written approval by EMSL. EMSL bears no responsibility for sample collection activities or analytical method limitations. Interpretation and use of test results are the responsibility of the client. Samples received in good condition unless otherwise noted. Samples analyzed by EMSL Analytical, Inc. Charlotte, NC AIHA-LAP, LLC - EMLAP Initial report from: 08/20/ :02:21 For Information on the fungi listed in this report please visit the Resources section at Test Report SPVER Printed: 8/20/ :02:21AM Page 4 of 4

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