16036 _PCA International_Indoor Air Sampling Report Sign Warehouse_2022.01.18

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Indoor Air Assessment Report Harris Teeter Sign Warehouse
PCA International Brownfields Site Matthews, North Carolina Brownfields Project No. 16036-12-060 H&H Job No. HTE-003
Table of Contents
1.0 Introduction and Background................................................................................................3
2.0 Indoor Air Assessment Activities ..........................................................................................6
2.1 Sample Locations and Collection Methods ...........................................................................6
2.2 Indoor Air Sampling Results .................................................................................................8
2.3 Vapor Intrusion Risk Calculations ........................................................................................9
3.0 Quality Assurance – Quality Control ..................................................................................11
4.0 Summary and Conclusions...................................................................................................12

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List of Tables
Table 1 Summary of Indoor Air Analytical Data

List of Figures
Figure 1 Site Location Map
Figure 2 Site Map
Figure 3 Historical Site and Adjacent Property Sample Location Map
Figure 4 HT Sign Warehouse Sample Locations

List of Appendices
Appendix A Indoor Air Building Survey and Sampling Form
Appendix B Indoor Air Sampling Field Form
Appendix C Laboratory Analytical Reports
Appendix D DEQ Risk Calculator Output
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Indoor Air Assessment Report Harris Teeter Sign Warehouse
PCA International Brownfields Site Matthews, North Carolina Brownfields Project No. 16036-12-060 H&H Job No. HTE-003
1.0 Introduction and Background On behalf of Matthews Property 1, LLC, Hart & Hickman, PC (H&H) has prepared this report to
document indoor air sampling completed at the Harris-Teeter Sign Warehouse located at 815
Matthews-Mint Hill Rd (the Site). A Site Location Map is provided as Figure 1. The Site was
formerly used for photofinishing by PCA International and is covered by a Brownfields
Agreement which was executed with the North Carolina Department of Environmental Quality
(DEQ) in April 2014 (Brownfields Project No. 16036-12-060). The Site is approximately 16
acres and contains two attached buildings that total approximately 172,000 sq ft.

The southern Site building is referred to herein as the Main Building and it has multiple floors, is
approximately 127,000 sq ft, and is not being used or occupied for any purpose. The
northwestern building is an approximately 45,000 sq ft single-story building that is used by
Harris-Teeter and referred to as the Sign Warehouse. The Sign Warehouse is used for
warehousing of signs, displays, and promotional items, merchandising display mock-ups, and
shelving storage. There is a small (approximately 3,000 sq ft) office area in the east-central
portion of the Sign Warehouse that contains two small office areas, a studio, and restrooms. The
studio portion of this area is only occasionally used for taking photographs or videos of products.
A Site Map showing the location of the Site buildings is provided as Figure 2, and a detail of the
Sign Warehouse layout is provided as Figure 4.

The Sign Warehouse is separated from the Main Building by two forklift doors and a personnel
door that remain closed at all times. The Sign Warehouse has approximately 20-ft ceilings
although drop ceilings are present in the office/studio area. The Sign Warehouse is conditioned
with multiple commercial roof-top HVAC units, and the office/studio area has a separate HVAC
system than the remainder of the warehouse. There are five dock doors along the southern wall
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of the Sign Warehouse that typically remain closed except when trucks are being loaded or
unloaded. Personnel doors with exterior access are located on the southern and northern walls of
the Sign Warehouse that remain closed during working hours (see Figure 4).

The Conbraco facility is located west of the Site (see Figure 2). We understand that Harris-
Teeter was recently contacted by DEQ Brownfields Program personnel because chlorinated
solvents were detected in groundwater samples collected in 2021 on the Conbraco facility,
including some near the western border of the Site. The primary compound detected in
groundwater in the Conbraco monitor wells is trichloroethene (TCE) with lower concentrations
of the TCE parent or daughter products tetrachloroethene (PCE), cis-1,2-dichloroethene (cis-1,2-
DCE), and trans-1,2-DCE. The approximate locations of the Conbraco facility monitor wells are
depicted in Figure 3 along with the TCE concentrations detected in the well samples collected in
August 2021. As indicated in Figure 3, TCE was detected in well MW-F at 47,900 µg/l,
although the TCE concentrations in well MW-B, which is located between MW-F and the Sign
Warehouse contained a significantly lower TCE concentration of 84.4 µg/l. TCE was not
detected in monitor well MW-D which is located due west of the Sign Warehouse. Based upon
topography (see Figure 1), groundwater flow direction based upon the monitor well groundwater
elevations contained in Conbraco’s October 2021 groundwater monitoring report, and the TCE
distribution on the Conbraco facility, groundwater flow direction at the Conbraco facility appears
to be to the north-northwest and cross-gradient of the Site.

Based upon the recent TCE detections in groundwater at the Conbraco facility, we understand
that the DEQ Brownfields Program requested that an evaluation of indoor air quality be
performed at the Site to evaluate potential risks to occupants of the Site due to the presence of
nearby groundwater impacts. In 2012, as part of Phase II Environmental Site Assessment (ESA)
activities completed in support of the Brownfields Agreement for the Site, H&H collected five
indoor air samples from the first and second floors of the Main Building and TCE was not
detected above DEQ Non-Residential Vapor Intrusion Indoor Air Screening Levels (IASLs).
The highest concentration of TCE detected in the 2012 samples from the Main Building was 0.96
µg/m3 versus the Non-Residential IASL of 1.8 µg/m3. The approximate locations of the 2012
indoor air samples are depicted in Figure 3. Because the Main Building is not being used (and
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there are no plans to use the building at this time) and previous assessment did not indicate the
presence of TCE above Non-Residential IASLs in the Main Building, the indoor air quality
assessment was only performed in the Sign Warehouse, which is currently being used by
personnel and is located closest to the Conbraco facility.

H&H submitted a Draft Work Plan for Indoor Air Sampling to the DEQ Brownfields Program on
November 23, 2021. DEQ Brownfields personnel and representatives of Harris-Teeter
(including its consultant/counsel) had a call to discuss the draft work plan on December 3, 2021,
and DEQ Brownfields personnel performed a Site visit on December 6, 2021. The DEQ
Brownfields Program provided conditional approval of the work plan in an email dated
December 7, 2021, H&H submitted the Final Work Plan on December 8, 2021, and DEQ
provided a formal Work Plan approval letter December 9, 2021.

The proposed indoor air assessment activities were performed in general accordance with the
DEQ Division of Waste Management (DWM) Vapor Intrusion Guidance (Guidance) dated
March 2018, the most recent versions of the U.S. Environmental Protection Agency (EPA)
Region 4 Laboratory Services and Applied Science Division (LSASD) Quality System and
Technical Procedures guidance, and the DEQ-approved Work Plan. A summary of the methods
and results of the indoor air sampling activities is provided below.

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2.0 Indoor Air Assessment Activities

2.1 Sample Locations and Collection Methods

On December 21, 2021, H&H collected four indoor air samples for laboratory analysis within the
Sign Warehouse. The indoor air samples were collected at locations within the Sign Warehouse
as depicted on Figure 4 and described below:

• SWIA-1 was collected in the southwest portion of the Sign Warehouse closest to
Conbraco monitor well MW-B.
• SWIA-2 was collected in the northern portion of the Sign Warehouse and was
biased to the western portion of that space closest to the Conbraco facility.
• SWIA-3 and SWIA-4 were collected in the two office areas where personnel are
located in the east-central portion of the Sign Warehouse.

On the day of the indoor air sampling activities, H&H conducted a survey to identify materials
within the building that may be indoor sources of potential compounds of concern. The survey
was documented in the Indoor Air Building Survey and Sampling Form from the DEQ Vapor
Intrusion Guidance, a copy of which is included as Appendix A. H&H performed a visit to the
Sign Warehouse on November 22, 2021 and did not locate items which have chlorinated solvents
as components. During the November Site visit and as documented on the Indoor Air Building
Survey and Sampling Form, H&H did identify small quantities of automotive chemicals
(antifreeze, Rain-X, diesel exhaust fluid, WD-40, automotive transmission fluid, refrigerant,
motor oil), paint, citrus-based adhesive remover, vegetable oil-based grill cleaner, alcohol and
petroleum-based cleaner/degreasers/solvents, and disinfectants, but none were identified as
containing chlorinated solvents. Some large stainless-steel items (food warming stations) were
identified, but there was no evidence that stainless steel cleaners were used and none were
reported to be used.

To collect the indoor air samples under conservative conditions, the samples were collected with
the doors of the buildings closed and ingress and egress activities minimized. The loading dock
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doors remained closed during the sampling event except that one door was opened for deliveries
for approximately 30 minutes at 11:30 am and 3:30 pm, which is typical. The indoor air samples
were collected using laboratory supplied individually certified 6-liter stainless steel Summa
sample canisters connected to in-line flow controllers with a vacuum gauge. In addition to the
four indoor air samples, one ambient exterior background sample (BG-1) was also collected.
The background sample was collected from an upwind location based upon the wind direction on
the day of the sampling. The background air sample was collected using a laboratory supplied
batch certified 6-liter stainless steel Summa sample canister connected to an in-line flow
controller with a vacuum gauge. In addition, for field and laboratory QA/QC purposes, H&H
collected one duplicate indoor air sample using a T-fitting during the sampling event. The
duplicate sample was collected from the same location as SWIA-1 and was analyzed for the
same compounds as the parent sample. The flow controllers for all of the sample canisters were
calibrated by the laboratory to allow the samples to be collected over an 8-hour period. A 3-foot
long sampling cane was connected to the flow controller so that the sample intake point was
positioned approximately 5 ft above grade (typical breathing zone height) when the sample
canister is set on its base.

During the sampling activities, pressure differential was measured near the start, middle, and end
of the 8-hour sampling period using a manometer sensitive to 0.001 inches of water. The
pressure differential at SWIA-1 and SWIA-2 was collected between indoor and outdoor
conditions, and the measured pressure differential at SWIA-3 and SWIA-4 was between the
office and warehouse spaces. In addition, exterior wind speed, exterior wind direction,
indoor/outdoor temperature, barometric pressure, and precipitation (if any) were recorded near
the start, middle, and end of the sampling period. H&H personnel periodically monitored each
sample canister to prevent tampering or damages during the sampling event. Prior to and after
the indoor and background air samples were collected, vacuum in the canisters were measured
using a laboratory supplied vacuum gauge and recorded by sampling personnel. The starting and
ending vacuum in each canister was recorded on the sample chain-of-custody. A vacuum of at
least -5 inches of mercury (“Hg) was maintained within the canisters at the conclusion of the
sampling event. The indoor air sampling field form is included in Appendix B.
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Please note that the regulator vacuum measurements collected from the duplicate samples
collected at the SWIA-1 location indicated a quicker drop in vacuum than expected. H&H
monitored the regulator vacuum during the sampling event and stopped the canisters when the
regulator indicated the vacuum was at -5” Hg which resulted in a 3.5-hour sample time. The lab
receipt pressure was recorded as -6.7” Hg, which is comparable to the pressure recorded by
H&H. Although the regulator only ran for approximately 3.5 hours, the sample collection was
stopped at an acceptable vacuum and analytical results, discussed below, are consistent with
other samples collected in the open warehouse space at the Site. Therefore, H&H does not
believe the apparently faulty regulator impacted the analytical results of the samples collected at
SWIA-1.

Following collection, the sample canisters were labeled and shipped under standard chain-of-
custody procedures to Contest Analytical for analysis of the following volatile organic
compounds (VOCs) by EPA Method TO-15, which are the VOCs of potential concern associated
with Conbraco facility groundwater (and their degradation products): PCE, TCE, cis-1,2-DCE,
trans-1,2-DCE, 1,1-dichloroethene (1,1-DCE), and vinyl chloride. H&H requested the
laboratory use reporting limits that are below DEQ Non-Residential IASLs.

2.2 Indoor Air Sampling Results
A tabular summary of the indoor air sample laboratory VOC analytical results is provided as
Table 1. The laboratory analytical report and chain of custody records are provided in Appendix
C. The analytical results in Table 1 are compared to the DEQ DWM Non-Residential Indoor Air
Screening Levels (IASLs) dated June 2021 based upon a lifetime incremental cancer risk (LICR)
of LICR of 1 x 10-6 for potential carcinogenic effects and a Hazard Quotient (HQ) of 0.2 for
potential non-carcinogenic effects.

Laboratory analytical results from the indoor air sampling event indicated that no VOCs were
detected in the indoor air samples at concentrations exceeding the Non-Residential IASLs. As
indicated in Table 1, all of compounds were detected at similar concentrations which is not
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unexpected given the open nature of the warehouse and connected office spaces. Trace
concentrations of PCE (ranging from 0.095 J µg/m3 to 0.11 J µg/m3) and TCE (ranging from
0.15 J µg/m3 to 0.28 µg/m3) were detected in each indoor air sample, however the detected
concentrations are well below the PCE and TCE Non-Residential IASLs of 35 and 1.8 µg/m3,
respectively. In addition, trans-1,2-dichloroethene (trans-1,2-DCE) was detected in SWIA-3 at
an estimated concentration of 0.050 J µg/m3, which is below the Non-Residential IASL of 35
µg/m3. Trans-1,2-DCE was also detected in the background ambient air sample at a
concentration of 0.064 J µg/m3, indicating that the detection in SWIA-3 was most likely
associated with ambient air. No other compounds were detected above the laboratory method
detection limits in the indoor air or background air samples.

The concentrations of TCE detected in 2021 in the Sign Warehouse are consistent with (albeit
lower) than those detected in the Main Building in 2012. As such, there is no indication that
vapor intrusions risks at the Site have increased over time as a result of potential migrating
groundwater impacts from the Conbraco facility.

Differential pressure measurements collected at SWIA-1 and SWIA-2 between indoor and
outdoor conditions indicated no measurable differential at the beginning and end of the sample
event, with negative differential pressure in the middle of the event. Negative differential
pressure indicates air flow from inside the warehouse to the outdoor air. Similarly, no
differential pressure was measured between the warehouse and office spaces (SWIA-3 and
SWIA-4) with the exception of the end of the sampling event measurement at SWIA-3, which
indicated a negative pressure differential indicating air flow out of the office to the warehouse.

2.3 Vapor Intrusion Risk Calculations

As noted above, the DEQ DWM IASLs are conservative and based upon a LICR of 1 x 10-6 for
potential carcinogenic effects and a HQ of 0.2 for potential non-carcinogenic effects. The DEQ
and EPA acceptable risk range for potential carcinogenic risks is a cumulative LICR of 1 x 10-4
to 1 x 10-6 or less and the acceptable risk level for non-carcinogenic risks is a hazard index (HI)
equal to or less than 1. The HI is the sum of the HQs for each compound.
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H&H utilized the DEQ risk calculator (June 2021) to further evaluate cumulative risks for the
compounds detected in indoor air. For the evaluation, H&H used the non-residential risk
calculator and input the highest concentration of the compounds detected in any sample to
represent a hypothetical “worst case” scenario. A summary of the risk calculation is provided in
Table 1, and a copy of the risk calculator output are provided in Appendix D.

As indicated in Table 1, using the hypothetical worst-case scenario, the calculated LICR for the
indoor air samples is 9.6 x 10-8 and the calculated HI is 0.033. The risk calculation results
indicate that the LICR and HI values are orders of magnitude below the acceptable risk levels.

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3.0 Quality Assurance – Quality Control

For quality assurance and quality control purposes (QA/QC), H&H collected a duplicate indoor
air sample for VOC analysis using a laboratory supplied “T-sampler” which allows for collection
of two samples from the same location simultaneously. As discussed above, the indoor air
duplicate sample (SWIA-DUP) was collected at the same sample location as SWIA-1 in the
southwestern portion of the Site and was analyzed for the select list of VOCs by EPA Method
TO-15. As indicated in Table 1, the data indicate good correlation between the two samples.

Laboratory QA/QC procedures were employed to ensure appropriate sample handling and
analysis and to aid in the review and validation of the analytical data. QA/QC procedures were
conducted in accordance with the method protocols and included regular equipment
maintenance, equipment calibrations, and adherence to specific sample custody and data
management procedures. Samples were analyzed in conjunction with appropriate blanks,
laboratory duplicates, continuing calibration standards, surrogate standards, and matrix spiking
standards in accordance with approved methodologies to monitor both instrument and analyst
performance. The laboratory included estimated concentrations for compounds that were
detected at levels above the laboratory method detection limit, but below the laboratory reporting
limit (J Flags) for indoor air and sub-slab analytical results.

The laboratory analytical data report and QA package for each group of samples submitted to
and analyzed by the subcontracted laboratory is provided in Appendix C. The laboratory
analytical report contains some data qualifiers which are described in Appendix C; however,
none appear to affect the quality of the data and the samples were received by the laboratory in
good condition and analyzed within holding times.
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4.0 Summary and Conclusions

H&H completed indoor air sampling at the Harris-Teeter Sign Warehouse in order to evaluate
potential risks to occupants of the Site due to the presence of recent TCE detections in
groundwater at the adjacent Conbraco facility and at the request of the DEQ Brownfields
Program. A brief summary of the vapor intrusion assessment activities is provided below.

• Results of indoor air samples indicate that no VOCs were detected above the Non-
Residential IASLs. Trace concentrations of TCE, PCE and trans-1,2-DCE were detected
above the laboratory method detection limits, but well below the Non-Residential IASLs.

• Using the indoor air data from the December 2021 sampling event, H&H completed
hypothetical “worst-case” risk calculations for a non-residential scenario. Calculated
cumulative risks were well below acceptable risk levels.

The results of the vapor intrusion assessment indicate no unacceptable risks from potential vapor
intrusion to the Sign Warehouse from groundwater impacts identified on the adjacent property.
As such, H&H does not recommend further assessment or risk evaluation for the Sign
Warehouse.

Table
Table 1Summary of Indoor Air Analytical DataPCA International Brownfields SiteMatthews, North CarolinaH&H Job No. HTE-003Sample IDSWIA-2 SWIA-3 SWIA-4 BG-1LocationNorthern portion of warehouseOffice Area Office Area West of warehouseDate12/21/2021 12/21/2021 12/21/2021 12/21/2021UnitsVOCs (TO-15)1,1-Dichloroethene<0.055 <0.055 <0.055 <0.055 <0.055 <0.055180cis-1,2-Dichloroethene<0.047 <0.047 <0.047 <0.047 <0.047 <0.047NEtrans-1,2-Dichloroethene<0.049 <0.049 <0.0490.050 J<0.0490.064 J35Tetrachloroethene (PCE)0.11 J 0.11 J 0.11 J 0.10 J 0.095 J<0.07035Trichloroethene (TCE)0.28 0.27 0.21 0.15 J 0.18 J<0.0701.8Vinyl Chloride<0.036 <0.036 <0.036 <0.036 <0.036 <0.0362.8DEQ Risk Calculator (June 2021)(2)LICR--1 x 10-4Non-Carcinogenic HI--1.0Notes:1) NC Department of Environmental Quality (DEQ) Division of Waste Management (DWM) Indoor Air Screening Levels (IASLs) (June 2021) based upon LICR = 1 x 10-6 and THQ = 0.2.2) NC DEQ DWM Risk Calculator dated June 2021.Compound concentrations are reported in micrograms per cubic meter (μg/m3)Compound concentrations are reported to the laboratory method detection limitsLaboratory analytical methods are shown in parenthesesVOCs = volatile organic compounds; NE= Not Established; -- = Not CalculatedLICR = Lifetime Incremental Carcinogenic Risk; HI = Hazard Index; THQ = Hazard QuotientLICR and HI compared to DEQ and EPA acceptable risk levels for carcinogenic and non carcinogenic risks.J = compound was detected above the laboratory method detection limit but below the laboratory reporting limit resulting in an estimated concentration9.6 x 10-80.033 DWM Non-Residential IASLs (1)Southwest portion of warehouse12/21/2021µg/m3SWIA-1 / SWIA-DUPS:\AAA-Master Projects\Harris Teeter - HTE\HTE-003 PCA\2021 VI\Dec-21 IA Sampling\Report\Tables\HTE Sign Warehouse Data Tables1/13/2022Table 1 (Page 1 of 1)Hart & Hickman, PC

Figures
SITE
0 2000 4000
APPROXIMATE
SCALE IN FEETN
U.S.G.S. QUADRANGLE MAPS
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
TITLE
PROJECT
SITE LOCATION MAP
FORMER PCA INTERNATIONAL SIGN WAREHOUSE(CURRENT HT SIGN WAREHOUSE)MATTHEWS, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE:
1-12-22 0
1HTE-003
MATTHEWS, NC 1971PHOTOREVISED 1988MINT HILL, NC 1993
2923 S. Tryon Street, Suite 100Charlotte, NC 28203704.586.0007(p) 704.586.0373(f)
REVISION NO. 0
JOB NO. HTE-003
DATE: 1-12-22
FIGURE NO. 2
PCA INTERNATIONAL BROWNFIELDS SITE
(CURRENT HT SIGN WAREHOUSE)
MATTHEWS, NORTH CAROLINA
SITE MAP
LEGEND
SITE PROPERTY BOUNDARY
PARCEL BOUNDARY
SURFACE WATER FEATURE
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
NOTES:
1.AERIAL IMAGERY AND PARCEL DATA OBTAINED FROM
MECKLENBURG COUNTY GIS (2021).
MATTHEWS-MINT HILL ROAD
INDEPENDENCE
PO
INT
PARKWAY
MATTHEWS TOWNSHIP PARKWY
A
Y
CRESTDALE ROADFOUR LAKES

D
R
I
V
E
CONBRACO INDUSTRIES INC.
(701 MATTHEWS-MINT HILL ROAD)MULT-TENANT BUSINESS PARK
(10810-10820 INDEPENDENCE POINTE PARKWAY
/ 921 MATTHEWS-MINT HILL ROAD)
INDUSTRIAL BUILDING
(900 FOUR LAKES DRIVE)
SIGN WAREHOUSE
(OCCUPIED)
MAIN BUILDING
(UNOCCUPIED)
JONATHAN'S
(10630 INDEPENDENCE POINTE PARKWAY)
MULT-TENANT
OFFICE BUILDING
(1730 MATTHEWS
TOWNSHIP
PARKWAY)
NOVANT HEALTH
CANCER INSTITUTES
(1700 MATTHEWS
TOWNSHIP
PARKWAY)
REVISION NO. 0
JOB NO. HTE-003
DATE: 1-12-22
FIGURE NO. 3
HISTORICAL SITE AND ADJACENT
PROPERTY SAMPLE LOCATION MAP
LEGEND
SITE PROPERTY BOUNDARY
PARCEL BOUNDARY
CONBRACO MONITORING WELL LOCATION
2012 INDOOR AIR SAMPLE LOCATION (1ST FLOOR)
2012 INDOOR AIR SAMPLE LOCATION (2ND FLOOR)
2021 BACKGROUND AMBIENT AIR SAMPLE LOCATION
GROUNDWATER FLOW
TCE CONCENTRATION (PPB)
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
NOTES:
1.AERIAL IMAGERY AND PARCEL DATA OBTAINED FROM
MECKLENBURG COUNTY GIS (2021).
2.TCE = TRICHLOROETHYLENE
PPB = PARTS PER BILLION
3.TCE GROUNDWATER DATA FROM AUGUST 2021.
CONBRACO INDUSTRIES INC.
(701 MATTHEWS-MINT HILL ROAD)
SIGN WAREHOUSE
(OCCUPIED)
MAIN BUILDING
(UNOCCUPIED)
MW-C
MW-D
MW-G
MW-H
MW-F
MW-B
MW-E
MW-I
IAS-5
IAS-1
IAS-4
IAS-3
IAS-2
BG-1
(903)
(1,270)
(183)
(47,900)
(84.4)
(23,300)
(61.6)
(<1)
(84.4)
PCA INTERNATIONAL BROWNFIELDS SITE
(CURRENT HT SIGN WAREHOUSE)
MATTHEWS, NORTH CAROLINA
SWIA-1/
SWIA-DUP
SWIA-4
SWIA-3
SWIA-2
OFFICES
STUDIOSTUDIO
MAIN BUILDING
(UNOCCUPIED)
LOADING DOCK DOORS (5)
DOORS CLOSED
REVISION NO. 0
JOB NO. HTE-003
DATE: 1-12-22
FIGURE NO. 4
HT SIGN WAREHOUSE
SAMPLE LOCATIONS
LEGEND
INDOOR AIR SAMPLE LOCATION
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
NOTES:
1.SEE BACKGROUND SAMPLE LOCATION ON FIGURE 3.
PCA INTERNATIONAL BROWNFIELDS SITE
(CURRENT HT SIGN WAREHOUSE)
MATTHEWS, NORTH CAROLINA

Appendix A Indoor Air Building Survey and Sampling Form
INDOOR AIR BUILDING SURVEY
and SAMPLING FORM
Site Name: ____________________________________ DSCAID#: ______________________
Preparer’s name: ________________________________ Date: __________________________
Preparer’s affiliation: ____________________________ Phone #: _______________________
Part I - Occupants
Building Address: ____________________________________________________________________
Property Contact: _______________________________ Owner / Renter / other: ______________
Contact’s Phone: home ( )__________ work ( )______________ cell ( )____________
# of Building occupants: Children under age 13 _____ Children age 13-18 ______ Adults _____
Part II – Building Characteristics
Building type: residential / multi-family residential / office / strip mall / commercial / industrial
Describe building: ________________________________________ Year constructed: _________
Sensitive population: day care / nursing home / hospital / school / other (specify): _______________
Number of floors below grade: ______ (full basement / crawl space / slab on grade)
Number of floors at or above grade: ______
Depth of basement below grade surface: ______ ft. Basement size: _______ ft2
Basement floor construction: concrete / dirt / floating / stone / other (specify): ________________
Foundation walls: poured concrete / cinder blocks / stone / other (specify) ________________
Basement sump present? Yes / No Sump pump? Yes / No Water in sump? Yes / No
Type of heating system (circle all that apply):
hot air circulation hot air radiation wood steam radiation
heat pump hot water radiation kerosene heater electric baseboard
other (specify): ________________________
Type of ventilation system (circle all that apply):
central air conditioning mechanical fans bathroom ventilation fans
individual air conditioning units kitchen range hood fan outside air intake
other (specify): _________________
Type of fuel utilized (circle all that apply):
Natural gas / electric / fuel oil / wood / coal / solar / kerosene
Are the basement walls or floor sealed with waterproof paint or epoxy coatings? Yes / No
industrial
cinder blocks r b
No No No
gy (
hot air circulation
y(
central air conditioning
electric
No
Harris Teeter Sign Warehouse
Julie Horgan 12/21/21
H&H -
818 Matthews-Mint Hill Road
Russ
5
Warehouse for Harris Teeter signs
0
1
bricks
Is there a whole house fan? Yes / No
Septic system? Yes / Yes (but not used) / No
Irrigation/private well? Yes / Yes (but not used) / No
Type of ground cover outside of building: grass / concrete / asphalt / other (specify) _____________
Existing subsurface depressurization (radon) system in place? Yes / No active / passive
Sub-slab vapor/moisture barrier in place? Yes / No
Type of barrier: ____________________________
Part III - Outside Contaminant Sources
Other stationary sources nearby (gas stations, emission stacks, etc.): _____________________________
Heavy vehicular traffic nearby (or other mobile sources): ______________________________________
Part IV – Indoor Contaminant Sources
Identify all potential indoor sources found in the building (including attached garages), the location of the
source (floor and room), and whether the item was removed from the building 48 hours prior to indoor air
sampling event. Any ventilation implemented after removal of the items should be completed at least 24
hours prior to the commencement of the indoor air sampling event.
Potential Sources Location(s)Removed
(Yes / No / NA)
Gasoline storage cans
Gas-powered equipment
Kerosene storage cans
Paints / thinners / strippers
Cleaning solvents
Oven cleaners
Carpet / upholstery cleaners
Other house cleaning products
Moth balls
Polishes / waxes
Insecticides
Furniture / floor polish
Nail polish / polish remover
Hairspray
Cologne / perfume
Air fresheners
Fuel tank (inside building) NA
Wood stove or fireplace NA
New furniture / upholstery
New carpeting / flooring NA
Hobbies - glues, paints, etc.
No
No
No
asphalt
No
No
None
Traffic on Matthews-Mint Hill Road
Right of main entrance No
Right of main entrance No
Right of main entrance No
Right of main entrance No
Right of main entrance No
None N/A
Right of main entrance No
Right of main entrance No
None N/A
Right of main entrance No
None N/A
None N/A
NE corner No
NE corner No
NE corner No
NE corner No
None
None
New shelving units throughout warehouse No
None
LED light panels, home candles, forklifts, printer/copy machines No
Part V – Miscellaneous Items
Do any occupants of the building smoke? Yes / No How often? ______________
Last time someone smoked in the building? ____________ hours / days ago
Does the building have an attached garage directly connected to living space? Yes / No
If so, is a car usually parked in the garage? Yes / No
Are gas-powered equipment or cans of gasoline/fuels stored in the garage? Yes / No
Do the occupants of the building have their clothes dry cleaned? Yes / No
If yes, how often? weekly / monthly / 3-4 times a year
Do any of the occupants use solvents in work? Yes / No
If yes, what types of solvents are used? _______________________________________
If yes, are their clothes washed at work? Yes / No
Have any pesticides/herbicides been applied around the building or in the yard? Yes / No
If so, when and which chemicals? _________________________________________________
Has there ever been a fire in the building? Yes / No If yes, when? _____________
Has painting or staining been done in the building in the last 6 months? Yes / No
If yes, when __________________ and where? ____________________________
Part VI – Sampling Information
Sample Technician: ____________________________ Phone number: ( ) _______ - __________
Sample Source: Indoor Air / Crawlspace Air / Sub-Slab / Near Slab Soil Gas / Exterior Soil Gas
Sampler Type: Tedlar bag / Sorbent / Stainless Steel Canister / Other (specify): _________________
Analytical Method: TO-15 / TO-17 / other: _________ Cert. Laboratory: _________________
Sample locations (floor, room):
Field ID # _____ - ________________________ Field ID # _____ - __________________________
Field ID # _____ - ________________________ Field ID # _____ - __________________________
Were “Instructions for Occupants” followed? Yes / No
If not, describe modifications: __________________________________________________________
No
No
No
Yes
No
No
No
No
Air Indoor r A
Stainless Steel Canister /
: TO-15
Yes
retail-sized containers for cleaning
Julie Horgan 704 586
Con-Test
SWIA 1/DUP SWIA 3
SWIA 2SWIA4; BG-1
Provide Drawing of Sample Location(s) in Building
Part VII - Meteorological Conditions
Was there significant precipitation within 12 hours prior to (or during) the sampling event? Yes / No
Describe the general weather conditions: ___________________________________________________
_____________________________________________________________________________________
Part VIII – General Observations
Provide any information that may be pertinent to the sampling event and may assist in the data
interpretation process (e.g., observed that drycleaner operated with door or windows propped open for
ventilation).
(Adapted from the NJDEP Vapor Intrusion Guidance, October 2005)
No
Mid-30s to 40s F, cloudy, 5-6 mph nne winds,
slight precipitation beginning at 11:45 and ending by 1330, approximately 0.07 inches total
Loading bays for deliveries remained closed during sampling with the exception of ~30 mins
at 11:30 and 15:30. Office A doors remained closed during sampling as per usual, and office B doors
remained open as per usual.

Appendix B Indoor Air Sampling Field Form
&Žƌŵ/^Ͳϭ,QGRRU$LU6DPSOLQJ)LHOG)RUP3URMHFW1RBBBBBBBBBBBBBBBBBBB 6DPSOHUBBBBBBBBBBBBBBBBBBBBBB :HDWKHUBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB'DWH3URSRVHG6DPSOLQJ'XUDWLRQ7LPH&DQLVWHU3UHVVXUH'LIIHUHQWLDO3UHVVXUH2XWGRRU7HPSHUDWXUH2XWGRRU+XPLGLW\,QGRRU7HPSHUDWXUH,QGRRU+XPLGLW\PPGG\\ +RXUV KU +J+2R)R)^͗%HJLQQLQJ͗0LGGOHZ͗(QG^͗%HJLQQLQJ͗0LGGOHZ͗(QG^͗%HJLQQLQJ͗0LGGOHZ͗(QG^͗%HJLQQLQJ͗0LGGOHZ͗(QG^͗%HJLQQLQJ͗0LGGOHZ͗(QG^͗%HJLQQLQJ͗0LGGOHZ͗(QG6 VDPSOH,'& FDQLVWHU,'5 UHJXODWRU,' 1RWHQHJDWLYHGLIIHUHQWLDOSUHVVXUHLQGLFDWHVWKDWLQGRRUSUHVVXUHZDVORZHUWKDQSUHVVXUHRXWGRRUV/DVWXSGDWHG+J LQFKHVRIPHUFXU\+2 LQFKHVRIZDWHUFROXPQ7LPH(671RWHVBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB3UHFLSLWDWLRQLQFKHVBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB%DURPHWULF3UHVVXUH+JBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB:LQG'LUHFWLRQBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB:LQG6SHHGPSKBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB^ŝnjĞ͗&ůŽǁZĂƚĞ͗^ŝnjĞ͗&ůŽǁZĂƚĞ͗^ŝnjĞ͗&ůŽǁZĂƚĞ͗^ŝnjĞ͗&ůŽǁZĂƚĞ͗,QGRRU3DUDPHWHUV6DPSOLQJ3HULRG6DPSOLQJ,QIRUPDWLRQ 2XWGRRU3DUDPHWHUV6DPSOH,'^ŝnjĞ͗&ůŽǁZĂƚĞ͗^ŝnjĞ͗&ůŽǁZĂƚĞ͗͗ͰhƐĞƌƐͰŵǀĂǁƚĞƌͰƌŽƉďŽdžͰLJKƚŚĞƌͰ&ŽƌŵĚŝƚƐͰ/YͲ^^sͰsĂƉŽƌ^ĂŵƉůŝŶŐ&ŽƌŵƐͺsϲ͘Ϭ/ŶĚŽŽƌŝƌ^ĂŵƉůŝŶŐ&ŝĞůĚ&Žƌŵ,ĂƌƚΘ,ŝĐŬŵĂŶ͕Wrehouse.HTE.003 JSH 40 F, 5 mph nne winds, 76% humidityBG-10828 -27 N/A 35 77 N/A N/A6 L216112/21/21 81218 -19 N/A 42 100 N/A N/A35970.75 L/hr1650 -5 N/A 41 69 N/A N/ASWIA-1/DUP0831 -27 0.0000 N/A N/A 65 606 L2179/112812/21/21 81031 -15 -0.0008 N/A N/A 65 6032050.75 L/hr1205 -5 0.0000 N/A N/A 65 60SWIA-20834 -27.5 0.0000 N/A N/A 65 606 L128112/21/21 81220 017 -0.0008 N/A N/A 65 6033140.75 L/hr1635 -5 0.0000 N/A N/A 65 60SWIA-30838 -29 0.0000 N/A N/A 65 606 L207112/21/21 81220 -18 0.0000 N/A N/A 65 6030230.75 L/hr1645 -7 -0.0005 N/A N/A 65 60SWIA-40840 -29 0.0000 N/A N/A 65 606 L117612/21/21 81222 -19 0.0000 N/A N/A 65 600.75 L/hr33131647 -7 0.0000 N/A N/A 65 600800 1215 1600Differential pressure for SWIA-1 and SWIA-20.00 0.07 0.00collected relative to outdoor air. Differential30.10 30.03pressure for SWIA-3 and SWIA-4 collected29.91NNE NNE NNErelative to warehouse space. Negative 566differential indicates flow out of the office/wa

Appendix C Laboratory Analytical Reports
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
December 29, 2021
Alexis McKenzie
Hart & Hickman - Charlotte, NC
2923 South Tryon Street, Suite 100
Charlotte, NC 28203
Project Location: Matthews, NC
Client Job Number:
Project Number: HTE-003
Laboratory Work Order Number: 21L1741
Enclosed are results of analyses for samples as received by the laboratory on December 22, 2021. If you have any questions
concerning this report, please feel free to contact me.
Sincerely,
Kerry K. McGee
Project Manager
QA Officer
Katherine Allen
Laboratory Manager
Daren Damboragian
Page 1 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL SUMMARY
12/29/2021Hart & Hickman - Charlotte, NC
2923 South Tryon Street, Suite 100
Charlotte, NC 28203
ATTN: Alexis McKenzie
HTE-003
21L1741
The results of analyses performed on the following samples submitted to Con-Test, a Pace Analytical Laboratory, are found in this report.
PROJECT LOCATION:
PURCHASE ORDER NUMBER:
PROJECT NUMBER:
REPORT DATE:
WORK ORDER NUMBER:
FIELD SAMPLE #LAB ID:MATRIX TESTSAMPLE DESCRIPTION SUB LAB
Matthews, NC
HTE-003
SWIA-1 21L1741-01 Indoor air EPA TO-15
SWIA-2 21L1741-02 Indoor air EPA TO-15
SWIA-3 21L1741-03 Indoor air EPA TO-15
SWIA-4 21L1741-04 Indoor air EPA TO-15
SWIA-DUP 21L1741-05 Indoor air EPA TO-15
BG-1 21L1741-06 Ambient Air EPA TO-15
Page 2 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
CASE NARRATIVE SUMMARY
All reported results are within defined laboratory quality control objectives unless listed below or otherwise qualified in this report.
The results of analyses reported only relate to samples submitted to Con-Test, a Pace Analytical Laboratory, for testing.
I certify that the analyses listed above, unless specifically listed as subcontracted, if any, were performed under my direction according to the approved methodologies listed
in this document, and that based upon my inquiry of those individuals immediately responsible for obtaining the information, the material contained in this report is, to the
best of my knowledge and belief, accurate and complete.
Lisa A. Worthington
Technical Representative
Page 3 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Matthews, NC
Date Received: 12/22/2021
Work Order: 21L1741Sample Description/Location:
Field Sample #: SWIA-1
Sample ID: 21L1741-01
Sample Matrix: Indoor air
Initial Vacuum(in Hg): -27
Final Vacuum(in Hg): -5
Receipt Vacuum(in Hg): -6.7
Sampled: 12/21/2021 12:05
Canister ID: 2179
Flow Controller ID: 3205
Sub Description/Location:
Canister Size: 6 liter
Flow Controller Type: Fixed-Orifice
Flow Controller Calibration
RPD Pre and Post-Sampling:
Sample Type: 8 hr
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/Time
EPA TO-15
ppbv ug/m3
MDL MDL
1,1-Dichloroethylene ND 0.035 12/26/21 20:27 BRFND0.7020.140.014 0.055
cis-1,2-Dichloroethylene ND 0.035 12/26/21 20:27 BRFND0.7020.140.012 0.047
trans-1,2-Dichloroethylene ND 0.035 12/26/21 20:27 BRFND0.7020.140.012 0.049
Tetrachloroethylene 0.017 0.035 12/26/21 20:27 BRFJ0.11 0.7020.240.010 0.070
Trichloroethylene 0.052 0.035 12/26/21 20:27 BRF0.28 0.7020.190.013 0.070
Vinyl Chloride ND 0.035 12/26/21 20:27 BRFND0.7020.0900.014 0.036
Surrogates % Recovery % REC Limits
4-Bromofluorobenzene (1)104 12/26/21 20:2770-130
Page 4 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Matthews, NC
Date Received: 12/22/2021
Work Order: 21L1741Sample Description/Location:
Field Sample #: SWIA-2
Sample ID: 21L1741-02
Sample Matrix: Indoor air
Initial Vacuum(in Hg): -27.5
Final Vacuum(in Hg): -5
Receipt Vacuum(in Hg): -8.4
Sampled: 12/21/2021 16:35
Canister ID: 1281
Flow Controller ID: 3314
Sub Description/Location:
Canister Size: 6 liter
Flow Controller Type: Fixed-Orifice
Flow Controller Calibration
RPD Pre and Post-Sampling:
Sample Type: 8 hr
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/Time
EPA TO-15
ppbv ug/m3
MDL MDL
1,1-Dichloroethylene ND 0.035 12/26/21 21:15 BRFND0.7020.140.014 0.055
cis-1,2-Dichloroethylene ND 0.035 12/26/21 21:15 BRFND0.7020.140.012 0.047
trans-1,2-Dichloroethylene ND 0.035 12/26/21 21:15 BRFND0.7020.140.012 0.049
Tetrachloroethylene 0.017 0.035 12/26/21 21:15 BRFJ0.11 0.7020.240.010 0.070
Trichloroethylene 0.040 0.035 12/26/21 21:15 BRF0.21 0.7020.190.013 0.070
Vinyl Chloride ND 0.035 12/26/21 21:15 BRFND0.7020.0900.014 0.036
Surrogates % Recovery % REC Limits
4-Bromofluorobenzene (1)104 12/26/21 21:1570-130
Page 5 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Matthews, NC
Date Received: 12/22/2021
Work Order: 21L1741Sample Description/Location:
Field Sample #: SWIA-3
Sample ID: 21L1741-03
Sample Matrix: Indoor air
Initial Vacuum(in Hg): -29
Final Vacuum(in Hg): -6
Receipt Vacuum(in Hg): -6.6
Sampled: 12/21/2021 16:45
Canister ID: 2071
Flow Controller ID: 3023
Sub Description/Location:
Canister Size: 6 liter
Flow Controller Type: Fixed-Orifice
Flow Controller Calibration
RPD Pre and Post-Sampling:
Sample Type: 8 hr
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/Time
EPA TO-15
ppbv ug/m3
MDL MDL
1,1-Dichloroethylene ND 0.035 12/26/21 22:02 BRFND0.7020.140.014 0.055
cis-1,2-Dichloroethylene ND 0.035 12/26/21 22:02 BRFND0.7020.140.012 0.047
trans-1,2-Dichloroethylene 0.013 0.035 12/26/21 22:02 BRFJ0.050 0.7020.140.012 0.049
Tetrachloroethylene 0.015 0.035 12/26/21 22:02 BRFJ0.10 0.7020.240.010 0.070
Trichloroethylene 0.027 0.035 12/26/21 22:02 BRFJ0.15 0.7020.190.013 0.070
Vinyl Chloride ND 0.035 12/26/21 22:02 BRFND0.7020.0900.014 0.036
Surrogates % Recovery % REC Limits
4-Bromofluorobenzene (1)103 12/26/21 22:0270-130
Page 6 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Matthews, NC
Date Received: 12/22/2021
Work Order: 21L1741Sample Description/Location:
Field Sample #: SWIA-4
Sample ID: 21L1741-04
Sample Matrix: Indoor air
Initial Vacuum(in Hg): -29
Final Vacuum(in Hg): -7
Receipt Vacuum(in Hg): -3.5
Sampled: 12/21/2021 16:47
Canister ID: 1176
Flow Controller ID: 3313
Sub Description/Location:
Canister Size: 6 liter
Flow Controller Type: Fixed-Orifice
Flow Controller Calibration
RPD Pre and Post-Sampling:
Sample Type: 8 hr
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/Time
EPA TO-15
ppbv ug/m3
MDL MDL
1,1-Dichloroethylene ND 0.035 12/26/21 22:49 BRFND0.7020.140.014 0.055
cis-1,2-Dichloroethylene ND 0.035 12/26/21 22:49 BRFND0.7020.140.012 0.047
trans-1,2-Dichloroethylene ND 0.035 12/26/21 22:49 BRFND0.7020.140.012 0.049
Tetrachloroethylene 0.014 0.035 12/26/21 22:49 BRFJ0.095 0.7020.240.010 0.070
Trichloroethylene 0.034 0.035 12/26/21 22:49 BRFJ0.18 0.7020.190.013 0.070
Vinyl Chloride ND 0.035 12/26/21 22:49 BRFND0.7020.0900.014 0.036
Surrogates % Recovery % REC Limits
4-Bromofluorobenzene (1)104 12/26/21 22:4970-130
Page 7 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Matthews, NC
Date Received: 12/22/2021
Work Order: 21L1741Sample Description/Location:
Field Sample #: SWIA-DUP
Sample ID: 21L1741-05
Sample Matrix: Indoor air
Initial Vacuum(in Hg): -27
Final Vacuum(in Hg): -5
Receipt Vacuum(in Hg): -6.7
Sampled: 12/21/2021 00:00
Canister ID: 1128
Flow Controller ID: 3205
Sub Description/Location:
Canister Size: 6 liter
Flow Controller Type: Fixed-Orifice
Flow Controller Calibration
RPD Pre and Post-Sampling:
Sample Type: 8 hr
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/Time
EPA TO-15
ppbv ug/m3
MDL MDL
1,1-Dichloroethylene ND 0.035 12/26/21 23:36 BRFND0.7020.140.014 0.055
cis-1,2-Dichloroethylene ND 0.035 12/26/21 23:36 BRFND0.7020.140.012 0.047
trans-1,2-Dichloroethylene ND 0.035 12/26/21 23:36 BRFND0.7020.140.012 0.049
Tetrachloroethylene 0.016 0.035 12/26/21 23:36 BRFJ0.11 0.7020.240.010 0.070
Trichloroethylene 0.051 0.035 12/26/21 23:36 BRF0.27 0.7020.190.013 0.070
Vinyl Chloride ND 0.035 12/26/21 23:36 BRFND0.7020.0900.014 0.036
Surrogates % Recovery % REC Limits
4-Bromofluorobenzene (1)103 12/26/21 23:3670-130
Page 8 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Matthews, NC
Date Received: 12/22/2021
Work Order: 21L1741Sample Description/Location:
Field Sample #: BG-1
Sample ID: 21L1741-06
Sample Matrix: Ambient Air
Initial Vacuum(in Hg): -27
Final Vacuum(in Hg): -7
Receipt Vacuum(in Hg): -6.9
Sampled: 12/21/2021 16:50
Canister ID: 2161
Flow Controller ID: 3597
Sub Description/Location:
Canister Size: 6 liter
Flow Controller Type: Fixed-Orifice
Flow Controller Calibration
RPD Pre and Post-Sampling:
Sample Type: 8 hr
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/Time
EPA TO-15
ppbv ug/m3
MDL MDL
1,1-Dichloroethylene ND 0.035 12/27/21 0:23 BRFND0.7020.140.014 0.055
cis-1,2-Dichloroethylene ND 0.035 12/27/21 0:23 BRFND0.7020.140.012 0.047
trans-1,2-Dichloroethylene 0.016 0.035 12/27/21 0:23 BRFJ0.064 0.7020.140.012 0.049
Tetrachloroethylene ND 0.035 12/27/21 0:23 BRFND0.7020.240.010 0.070
Trichloroethylene ND 0.035 12/27/21 0:23 BRFND0.7020.190.013 0.070
Vinyl Chloride ND 0.035 12/27/21 0:23 BRFND0.7020.0900.014 0.036
Surrogates % Recovery % REC Limits
4-Bromofluorobenzene (1)102 12/27/21 0:2370-130
Page 9 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
Sample Extraction Data
Prep Method: TO-15 Prep-EPA TO-15
Lab Number [Field ID]Batch Date
Pressure
Dilution
Pre
Dilution
Pre-Dil
Initial
mL
Pre-Dil
Final
mL
Default
Injection
mL
Actual
Injection
mL
21L1741-01 [SWIA-1]B297965 1.5 1 N/A 1000 400 855 12/26/21
21L1741-02 [SWIA-2]B297965 1.5 1 N/A 1000 400 855 12/26/21
21L1741-03 [SWIA-3]B297965 1.5 1 N/A 1000 400 855 12/26/21
21L1741-04 [SWIA-4]B297965 1.5 1 N/A 1000 400 855 12/26/21
21L1741-05 [SWIA-DUP]B297965 1.5 1 N/A 1000 400 855 12/26/21
21L1741-06 [BG-1]B297965 1.5 1 N/A 1000 400 855 12/26/21
Page 10 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ug/m3 Spike Level
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Flag/Qual Analyte
Air Toxics by EPA Compendium Methods - Quality Control
QUALITY CONTROL
RL
ppbv
Results RL Results ppbv
Batch B297965 - TO-15 Prep
Blank (B297965-BLK1)Prepared & Analyzed: 12/26/21
0.035ND1,1-Dichloroethylene
0.035NDcis-1,2-Dichloroethylene
0.035NDtrans-1,2-Dichloroethylene
0.035NDTetrachloroethylene
0.035NDTrichloroethylene
0.035NDVinyl Chloride
8.00 70-130Surrogate: 4-Bromofluorobenzene (1)1048.29
LCS (B297965-BS1)Prepared & Analyzed: 12/26/21
5.00 70-13094.64.731,1-Dichloroethylene
5.00 70-13088.64.43cis-1,2-Dichloroethylene
5.00 70-13087.04.35trans-1,2-Dichloroethylene
5.00 70-13097.84.89Tetrachloroethylene
5.00 70-13092.84.64Trichloroethylene
5.00 70-13088.64.43Vinyl Chloride
8.00 70-130Surrogate: 4-Bromofluorobenzene (1)1078.53
Page 11 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
Note: Blank Subtraction is not performed unless otherwise noted
*QC result is outside of established limits.
Wide recovery limits established for difficult compound.
Wide RPD limits established for difficult compound.
#Data exceeded client recommended or regulatory level
RL Reporting Limit
MDL Method Detection Limit
RPD Relative Percent Difference
LCS Laboratory Control Sample
Laboratory Control SampleLCS Dup Duplicate Laboratory Control Sample
MS Matrix Spike Sample
MS Dup Duplicate Matrix Spike Sample
REC Recovery
QC Quality Control
ppbv Parts per billion volume
EPA United States Environmental Protection Agency
Percent Recovery% REC
ND Not Detected
Percent recoveries and relative percent differences (RPDs) are determined by the software using values in the
calculation which have not been rounded.
Not ApplicableN/A
DL Detection Limit
Not CalculatedNC
LFB/LCS Lab Fortified Blank/Lab Control Sample
ORP Oxidation-Reduction Potential
Not dry weight correctedwet
Percent weight% wt
KilogramKg
Gramg
Milligrammg
Microgramg
Nanogramng
LiterL
MillilitermL
Microliter L
Cubic Meterm3
Extractable Petroleum HydrocarbonsEPH
Volatile Petroleum HydrocarbonsVPH
Air Petroleum HydrocarbonsAPH
Flame Ionization DetectorFID
Photo Ionization DetectorPID
FLAG/QUALIFIER SUMMARY
Detected but below the Reporting Limit (lowest calibration standard); therefore, result is an estimated
concentration (CLP J-Flag).
J
ANALYST
Rebecca FaustRLF
PDF Management StationSTATION
Kerry K. McGeeKKM
Brittany R. FiskBRF
Page 12 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
INTERNAL STANDARD AREA AND RT SUMMARY
EPA TO-15
RTResponseInternal Standard Area %RT DiffResponse
Reference
RT
Reference Area %
Limits
RT Diff
Limit Q
Initial Cal Check (S066182-ICV1 )Lab File ID: G21A342016.D Analyzed: 12/08/21 16:58
Bromochloromethane (1)1512635 8.497 1402037 8.503 60 - 140108 -0.0060 +/-0.50
1,4-Difluorobenzene (1)3688445 10.271 3621476 10.277 60 - 140102 -0.0060 +/-0.50
Chlorobenzene-d5 (1)3527556 14.642 3493930 14.642 60 - 140101 0.0000 +/-0.50
INTERNAL STANDARD AREA AND RT SUMMARY
EPA TO-15
RTResponseInternal Standard Area %RT DiffResponse
Reference
RT
Reference Area %
Limits
RT Diff
Limit Q
Calibration Check (S066904-CCV1 )Lab File ID: G21A360004.D Analyzed: 12/26/21 15:34
Bromochloromethane (1)1512787 8.497 1402037 8.503 60 - 140108 -0.0060 +/-0.50
1,4-Difluorobenzene (1)3541788 10.271 3621476 10.277 60 - 14098 -0.0060 +/-0.50
Chlorobenzene-d5 (1)3286613 14.642 3493930 14.642 60 - 14094 0.0000 +/-0.50
LCS (B297965-BS1 )Lab File ID: G21A360005.D Analyzed: 12/26/21 16:14
Bromochloromethane (1)1515373 8.497 1512787 8.497 60 - 140100 0.0000 +/-0.50
1,4-Difluorobenzene (1)3562935 10.271 3541788 10.271 60 - 140101 0.0000 +/-0.50
Chlorobenzene-d5 (1)3303324 14.642 3286613 14.642 60 - 140101 0.0000 +/-0.50
Blank (B297965-BLK1 )Lab File ID: G21A360010.D Analyzed: 12/26/21 19:40
Bromochloromethane (1)1500594 8.503 1512787 8.497 60 - 14099 0.0060 +/-0.50
1,4-Difluorobenzene (1)3439942 10.271 3541788 10.271 60 - 14097 0.0000 +/-0.50
Chlorobenzene-d5 (1)3145238 14.642 3286613 14.642 60 - 14096 0.0000 +/-0.50
SWIA-1 (21L1741-01 )Lab File ID: G21A360011.D Analyzed: 12/26/21 20:27
Bromochloromethane (1)1529382 8.503 1512787 8.497 60 - 140101 0.0060 +/-0.50
1,4-Difluorobenzene (1)3465412 10.277 3541788 10.271 60 - 14098 0.0060 +/-0.50
Chlorobenzene-d5 (1)3175667 14.642 3286613 14.642 60 - 14097 0.0000 +/-0.50
SWIA-2 (21L1741-02 )Lab File ID: G21A360012.D Analyzed: 12/26/21 21:15
Bromochloromethane (1)1538653 8.497 1512787 8.497 60 - 140102 0.0000 +/-0.50
1,4-Difluorobenzene (1)3501812 10.271 3541788 10.271 60 - 14099 0.0000 +/-0.50
Chlorobenzene-d5 (1)3162743 14.642 3286613 14.642 60 - 14096 0.0000 +/-0.50
SWIA-3 (21L1741-03 )Lab File ID: G21A360013.D Analyzed: 12/26/21 22:02
Bromochloromethane (1)1541269 8.503 1512787 8.497 60 - 140102 0.0060 +/-0.50
1,4-Difluorobenzene (1)3517325 10.271 3541788 10.271 60 - 14099 0.0000 +/-0.50
Chlorobenzene-d5 (1)3212567 14.642 3286613 14.642 60 - 14098 0.0000 +/-0.50
SWIA-4 (21L1741-04 )Lab File ID: G21A360014.D Analyzed: 12/26/21 22:49
Bromochloromethane (1)1564979 8.497 1512787 8.497 60 - 140103 0.0000 +/-0.50
1,4-Difluorobenzene (1)3597042 10.271 3541788 10.271 60 - 140102 0.0000 +/-0.50
Chlorobenzene-d5 (1)3310326 14.642 3286613 14.642 60 - 140101 0.0000 +/-0.50
Page 13 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
INTERNAL STANDARD AREA AND RT SUMMARY
EPA TO-15
RTResponseInternal Standard Area %RT DiffResponse
Reference
RT
Reference Area %
Limits
RT Diff
Limit Q
SWIA-DUP (21L1741-05 )Lab File ID: G21A360015.D Analyzed: 12/26/21 23:36
Bromochloromethane (1)1547830 8.497 1512787 8.497 60 - 140102 0.0000 +/-0.50
1,4-Difluorobenzene (1)3549299 10.271 3541788 10.271 60 - 140100 0.0000 +/-0.50
Chlorobenzene-d5 (1)3251486 14.642 3286613 14.642 60 - 14099 0.0000 +/-0.50
BG-1 (21L1741-06 )Lab File ID: G21A360016.D Analyzed: 12/27/21 00:23
Bromochloromethane (1)1528046 8.497 1512787 8.497 60 - 140101 0.0000 +/-0.50
1,4-Difluorobenzene (1)3534993 10.271 3541788 10.271 60 - 140100 0.0000 +/-0.50
Chlorobenzene-d5 (1)3220286 14.642 3286613 14.642 60 - 14098 0.0000 +/-0.50
Page 14 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
CONTINUING CALIBRATION CHECK
EPA TO-15
S066904-CCV1
COMPOUND TYPE CCV MIN (#)CCV LIMIT (#)CCV ICAL
CONC. (ppbv)% DIFF / DRIFTRESPONSE FACTOR
STD
1.026629A -9.6 304.52 1.1358235.001,1-Dichloroethylene
0.869705A -13.5 304.32 1.0059575.00cis-1,2-Dichloroethylene
0.9091829A -14.8 304.26 1.0675385.00trans-1,2-Dichloroethylene
0.412687A -2.7 304.86 0.42425955.00Tetrachloroethylene
0.3601259A -8.3 304.58 0.39268525.00Trichloroethylene
0.6123945A -12.4 304.38 0.69936535.00Vinyl Chloride
* Values outside of QC limits
# Column to be used to flag Response Factor and %Diff/Drift values with an asterisk
Page 15 of 19
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
CertificationsAnalyte
CERTIFICATIONS
Certified Analyses included in this Report
EPA TO-15 in Air
AIHA,FL,NJ,NY,ME,NH,VA1,1-Dichloroethylene
AIHA,FL,NY,ME,NH,VAcis-1,2-Dichloroethylene
AIHA,NJ,NY,ME,NH,VAtrans-1,2-Dichloroethylene
AIHA,FL,NJ,NY,ME,NH,VATetrachloroethylene
AIHA,FL,NJ,NY,ME,NH,VATrichloroethylene
AIHA,FL,NJ,NY,ME,NH,VAVinyl Chloride
Con-Test, a Pace Environmental Laboratory, operates under the following certifications and accreditations:
Code Description Number Expires
100033AIHA-LAP, LLC - ISO17025:2017AIHA 03/1/2022
M-MA100Massachusetts DEPMA 06/30/2022
PH-0165Connecticut Department of Publilc HealthCT 12/31/2022
10899 NELAPNew York State Department of HealthNY 04/1/2022
2516 NELAPNew Hampshire Environmental LabNH-S 02/5/2022
LAO00112Rhode Island Department of HealthRI 12/30/2021
652North Carolina Div. of Water QualityNC 12/31/2022
MA007 NELAPNew Jersey DEPNJ 06/30/2022
E871027 NELAPFlorida Department of HealthFL 06/30/2022
LL720741Vermont Department of Health Lead LaboratoryVT 07/30/2022
MA00100State of MaineME 06/9/2023
460217Commonwealth of VirginiaVA 12/14/2022
2557 NELAPNew Hampshire Environmental LabNH-P 09/6/2022
VT-255716Vermont Department of Health Drinking WaterVT-DW 06/12/2022
25703North Carolina Department of HealthNC-DW 07/31/2022
68-05812Commonwealth of Pennsylvania DEPPA 06/30/2022
9100Dept. of Env, Great Lakes, and EnergyMI 09/6/2022
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Appendix D DEQ Risk Calculators
Version Date:
Basis:
Site Name:
Site Address:
DEQ Section:
Site ID:
Exposure Unit ID:
Submittal Date:
Reviewed By:
1/12/2022
Prepared By:H&H
Worst-Case Scenario
North Carolina Department of Environmental Quality
Risk Calculator
PCA International Sign Warehouse
815 Matthews-Mint Hill Road
DWM Brownfields
16036-12-060
June 2021
May 2021 EPA RSL Table
North Carolina DEQ Risk Calculator
Complete Exposure Pathways
Version Date: June 2021
Basis: May 2021 EPA RSL Table
Site ID: 16036-12-060
Exposure Unit ID: Worst-Case Scenario
Note: Risk output will only be calculated for complete exposure pathways.
Receptor Pathway
Check box if
pathway
complete
Soil
Groundwater Use
Soil
Groundwater Use
Construction Worker Soil
Soil
Surface Water
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Groundwater to Indoor Air
Soil Gas to Indoor Air
Indoor Air
Source Soil
Source Groundwater
Source Soil
Source Groundwater
Input Form 1A
VAPOR INTRUSION PATHWAYS
DIRECT CONTACT SOIL AND WATER PATHWAYS
Resident
Non-Residential Worker
Recreator/Trespasser
Resident
Non-Residential Worker
CONTAMINANT MIGRATION PATHWAYS
Groundwater
Surface Water
North Carolina DEQ Risk Calculator
Exposure Point Concentrations
Version Date: June 2021
Basis: May 2021 EPA RSL Table
Site ID: 16036-12-060
Exposure Unit ID: Worst-Case Scenario
Description of Exposure Point Concentration Selection:
Exposure Point
Concentration
(ug/m3)
Notes:CAS Number Chemical
Minimum
Concentration
(Qualifier)
Maximum
Concentration
(Qualifier)
Units
Location of
Maximum
Concentration
Detection
Frequency
Range of
Detection
Limits
Concentration
Used for
Screening
Background
Value
Screening
Toxicity Value
(Screening
Level) (n/c)
Potential
ARAR/TBC
Value
Potential
ARAR/TBC
Source
COPC Flag
(Y/N)
Rationale for
Selection or
Deletion
0.05 156-60-5 Dichloroethylene, trans-1,2-ug/m3
0.11 127-18-4 Tetrachloroethylene ug/m3
0.28 79-01-6 Trichloroethylene ug/m3
Input Form 2E
Indoor Air Exposure Point Concentration Table
Note: Chemicals highlighted in orange are non-volatile chemicals. Risks are calculated for these chemicals if indoor air concentrations are entered and indoor air screening levels have been established, but it should be noted that detections of these chemicals are likely not associated with vapor intrusion.
If the chemical list is changed from a prior calculator run, remember to select "See All Chemicals" on the data output sheet or newly added chemicals will not be included in risk calculations
North Carolina DEQ Risk Calculator
Risk for Individual Pathways Output Form 1A
Version Date: June 2021
Basis: May 2021 EPA RSL Table
Site ID: 16036-12-060
Exposure Unit ID: Worst-Case Scenario
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Soil NC NC NC
Groundwater Use*NC NC NC
Soil NC NC NC
Groundwater Use*NC NC NC
Construction Worker Soil NC NC NC
Soil NC NC NC
Surface Water*NC NC NC
Receptor Pathway Carcinogenic
Risk Hazard Index Risk exceeded?
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air NC NC NC
Indoor Air NC NC NC
Groundwater to Indoor Air NC NC NC
Soil Gas to Indoor Air NC NC NC
Indoor Air 9.6E-08 3.3E-02 NO
Pathway Source
Source Soil NC
Source Groundwater NC
Source Soil NC
Source Groundwater NC
3. NM = Not Modeled
4. NC = Pathway not calculated
DIRECT CONTACT SOIL AND WATER CALCULATORS
Resident
Non-Residential Worker
Recreator/Trespasser
2. * = If concentrations in groundwater exceed the NC 2L Standards or IMAC, or concentrations in surface water exceed the
NC 2B Standards, appropriate remediation and/or institutional control measures will be necessary to be eligible for a risk-based
closure.
Surface Water Exceedence of 2B at Receptor?
Exceedence of 2B at Receptor?
VAPOR INTRUSION CALCULATORS
Resident
Non-Residential Worker
CONTAMINANT MIGRATION CALCULATORS
Target Receptor Concentrations Exceeded?
Groundwater Exceedence of 2L at Receptor?
Exceedence of 2L at Receptor?
1. If lead concentrations were entered in the exposure point concentration tables, see the individual calculator sheets for lead
concentrations in comparison to screening levels. Note that lead is not included in cumulative risk calculations.
Notes:
North Carolina DEQ Risk Calculator
DEQ Risk Calculator - Vapor Intrusion - Non-Residential Worker Indoor Air
Version Date: June 2021
Basis: May 2021 EPA RSL Table
Site ID: 16036-12-060
Exposure Unit ID: Worst-Case Scenario
CAS #Chemical Name:
Indoor Air
Concentration
(ug/m3)
Target Indoor
Air Conc. for
Carcinogens @
TCR = 1E-06
Target Indoor Air
Conc. for Non-
Carcinogens @
THQ = 0.2
Calculated
Carcinogenic
Risk
Calculated
Non-
Carcinogenic
Hazard
Quotient
156-60-5 Dichloroethylene, trans-1,2-0.05 -3.5E+01 2.9E-04
127-18-4 Tetrachloroethylene 0.11 4.7E+01 3.5E+01 2.3E-09 6.3E-04
79-01-6 Trichloroethylene 0.28 3.0E+00 1.8E+00 9.4E-08 3.2E-02
Cumulative:9.6E-08 3.3E-02
All concentrations are in ug/m3
Output Form 3F
** - Note that the EPA has no consensus on reference dose or cancer slope factor values for lead, therefore it is not possible to calculate carcinogenic risk
or hazard quotient. Lead concentrations are compared to the National Ambient Air Quality Standard of 0.15 μg/m3.
Carcinogenic risk and hazard quotient cells highlighted in orange are associated with non-volatile chemicals. Risks are calculated for these values if
indoor air concentrations are entered and indoor air screening levels have been established, but it should be noted that detections of these chemicals are
likely not associated with vapor intrusion.
North Carolina DEQ Risk Calculator