22016_Quality Products Co._Mercury Assessment Report_2020.12.03

Via Email
October 27, 2020
NC DEQ – Division of Waste Management Brownfields Section
1646 Mail Service Center
Raleigh, NC 27699-1646 Attn: Mr. Bill Schmithorst, PG
Re: Mercury Vapor Assessment Report
Quality Products Charlotte, North Carolina Brownfields Project No. 22016-18-060 H&H Project No. LEH-004

Dear Mr. Schmithorst: On behalf of LEH NC Mint, LLC, enclosed is the Mercury Vapor Assessment Report for the Quality Products property (Brownfields Project No. 22016-18-060) for your review and
approval.
Should you have any questions or need additional information, please do not hesitate to contact us at [phone].
Sincerely,
Hart & Hickman, PC
Ralph McGee, PG Gregory Kanellis, PE Project Manager Project Manager

Enclosure cc: Mr. J. Kevin Slaughter, DEQ (Via Email) Mr. Nikolaus Lischerong, LEH NC Mint (Via Email)
#C-1269 Engineering
#C-245 Geology

Mercury Vapor Assessment Report

Quality Products
1513, 1515, and 1521 S. Mint Street
Charlotte, North Carolina
Brownfields Project No. 22016-18-060

H&H Job No. LEH-004 October 27, 2020

i \\hhfs01\masterfiles\aaa-master projects\lischerong enterprises and holdings (leh)\s. mint street\mercury assessment\report\mercury assessment report_quality products co. (bpn 22016-18-060)_20201027.doc
Mercury Vapor Assessment Report Quality Products
1513, 1515, and 1521 S. Mint Street Charlotte, North Carolina H&H Job No. LEH-004 Table of Contents
1.0 Introduction .............................................................................................................................1
2.0 Mercury Vapor Assessment Activities ..................................................................................2
2.1 Sub-Slab Mercury Vapor Sampling Methodology ................................................................2
2.2 Sub-Slab Mercury Vapor Analytical Results ........................................................................3
3.0 Summary and Conclusions.....................................................................................................4

List of Tables

Table 1 Summary of Sub-Slab Mercury Vapor Analytical Results
List of Figures

Figure 1 Site Location Map
Figure 2 Sample Location Map

List of Appendices

Appendix A Sub-Slab/Soil Gas Vapor QA/QC Field Form
Appendix B Analytical Laboratory Report
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Mercury Vapor Assessment Report Quality Products
1513, 1515, and 1521 S. Mint Street Charlotte, North Carolina H&H Job No. LEH-004
1.0 Introduction

Hart & Hickman, PC (H&H) has prepared this Mercury Vapor Assessment Report for the
Quality Products Brownfields property (Brownfields Project No. 22016-18-060) located at
1513, 1515, and 1521 S. Mint Street in Charlotte, Mecklenburg County, North Carolina (Site or
subject Site). A Site location map is provided as Figure 1.

The Site is comprised of three tax parcels (Mecklenburg County Parcel ID Nos. 11908315,
11908316, and 11908317) totaling approximately 0.53-acres and is currently developed with
a single-story multi-tenant commercial building with an associated gravel-covered parking area.
A Brownfields Agreement (BFA) for the Site between the North Carolina Department of
Environmental Quality (DEQ) and LEH NC Mint, LLC was recorded on August 28, 2020.

Proposed redevelopment plans for the Site include upfit and renovations for adaptive re-use of
the existing building. Redevelopment plans include the installation of a vapor intrusion
mitigation system for the existing building as detailed in the Vapor Intrusion Mitigation Plan
dated October 20, 2020. The remainder of the Site will be improved with impervious
surfaces including parking areas, sidewalks and exterior patios.

The DEQ Brownfields Program requested collection of sub-slab soil gas samples within the
Site building to establish pre-mitigation baseline mercury vapor concentrations. The
methods and results of the sub-slab mercury vapor sampling activities are summarized in the
following sections.

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2.0 Mercury Vapor Assessment Activities

On September 22, 2020, H&H collected four (4) sub-slab mercury vapor samples for laboratory
analysis within the Site building to establish pre-mitigation baseline mercury vapor
concentrations associated with potential soil impacts attributed to historical on-Site operations.
As shown in Figure 2, two (2) sub-slab soil mercury vapor samples were collected from each
tenant space within the Site building.

2.1 Sub-Slab Mercury Vapor Sampling Methodology

The sampling points were installed using a rotary hammer drill and 5/8-inch diameter drill bit to
advance a boring through the concrete slab to approximately 6 inches into the underlying soil
beneath the slab. Following borehole advancement, loose cuttings were removed, and a
Cox-Colvin Vapor PinTM (vapor pin) assembly (stainless steel sampling point and silicone
sleeve) were seated in the borehole using an installation/extraction tool and dead blow hammer
to form an air tight seal.

Prior to sampling, a leak check was performed on the sample point (Vapor Pin) annular seal prior
to assembling the sample train and sample collection. A shroud was placed over the sample
point, filled with helium gas, and a helium gas detector was used to maintain helium gas
concentrations within the shroud. With helium concentrations maintained within the shroud,
sample points were purged using a syringe and disposable fittings to collect purged vapor into a
Tedlar® bag. The purged soil gas was analyzed using the calibrated helium gas detector to
ensure that helium concentrations in the sample were less than 10% of the helium concentrations
measured within the shroud. A summary of helium leak checks is presented in Appendix A.

Following a successful leak check, a sampling train was assembled using Tygon® tubing with an
in-line laboratory supplied sorbent tube filled with hopcalite. An air sampling pump and a flow
meter was used to collect the sample through the sample train at a constant rate of approximately
200 liters per minute over a laboratory specified timeframe of approximately 60 minutes to
achieve the suitable laboratory method detection limits. Following sample collection, each
sub-slab sample point was abandoned, patched with concrete, and restored to pre-drilling
conditions.
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Due to the potential presence of background mercury in the sorbent media, two (2) field blanks
were prepared during the sampling event. Field blanks were prepared by opening the sample
media (sorbent tube) and sealing it without collection of soil gas through the media.

Samples were shipped under standard chain-of-custody protocols to Con-Test Analytical
Laboratory (Con-Test) of East Longmeadow, Massachusetts for analysis of elemental mercury
by the National Institute for Occupational Safety and Health (NIOSH) Method 6009.

2.2 Sub-Slab Mercury Vapor Analytical Results

A tabular summary of the sub-slab mercury vapor analytical results is provided as Table 1. The
laboratory analytical report and chain of custody record are provided in Appendix B. The
laboratory analytical results were compared to the DEQ Division of Waste Management (DWM)
Non-Residential Sub-slab and Exterior Soil Gas Screening Levels (SGSLs) dated July 2020. The
SGSLs are based upon a lifetime incremental target carcinogenic risk (TCR) of 1 x 10-6 and a
target hazard quotient (THQ) exposure level of 0.2 for potential non-carcinogenic effects.

Laboratory analysis indicates the presence of mercury vapors at an estimated concentration of
0.52 micrograms per cubic meter (µg/m3) in sample SSV-3 collected in the southern portion of
1513 S. Mint Street and historical machine shop area. The concentration was flagged with a “J”
and is considered a laboratory estimated concentration because mercury was detected above the
laboratory method detection limit, but below the laboratory reporting limit. The estimated
mercury concentration reported for sub-slab mercury vapor sample SSV-3 is well below the
DEQ DWM Non-Residential Vapor Intrusion SGSL of 26 µg/m3. Mercury was not detected
above the laboratory method detection limits in the remaining sub-slab vapor samples.

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3.0 Summary and Conclusions

H&H has completed the sub-slab mercury vapor assessment for the Quality Products
Brownfields property located at 1513, 1515, and 1521 S. Mint Street in Charlotte, North
Carolina. The assessment activities were conducted to establish pre-mitigation baseline
concentrations of mercury vapors. Mercury vapor was not detected in three of the four sub-slab
soil gas samples. Mercury vapor was detected at an estimated concentration in one sample
location (SSV-3, 0.52 J µg/m3) well below the DEQ DWM Non-Residential Vapor Intrusion
SGSL of 26 µg/m3 for mercury. As such, H&H recommends no further assessment of mercury
vapor at the Site.
Table 1
Summary of Sub-Slab Mercury Vapor Analytical Results
Quality Products Brownfields Property
1513, 1515, 1521 S. Mint Street
Charlotte, North Carolina
H&H Job No. LEH-004
Mercuryµg/m3
SSV-1 9/22/2020 60 North 1515 S. Mint St Former Finished Product Area <0.22
SSV-2 9/22/2020 60 North 1513 S. Mint St Former Stamping Area <0.22
SSV-3 9/22/2020 60 South 1513 S. Mint St Former Machine Shop 0.52 J
SSV-4 9/22/2020 60 South 1515 S. Mint St Former Tin and Finishing Room <0.21
BLANK-1 9/22/2020 N/A Ambient Ambient <2.6
BLANK-2 9/22/2020 N/A Ambient Ambient <2.6
26
Notes:
1) North Carolina Department of Environmental Quality (DEQ) Division of Waste Management (DWM) Non-Residential Sub-slab and Exterior Soil Gas
Screening Levels (SGSLs) (July 2020)
2) Sub-slab mercury vapor samples collected using hopcalite sorbent tubes and air pump calibrated to 0.2 L/min.
3) Compounds reported to laboratory method detection limit
µg/m3 = micrograms per cubic meter
J = detected above the method detection limit, but below the reporting limit (lowest calibration standard); therefore, the value is considered an estimated concentration.
N/A = not applicableSample IDNon-Residential Screening Level
NIOSH 6009Analytical MethodLocation DescriptionPortion of SiteSampling Duration (min)Sampling Date\\hhfs01\MasterFiles\AAA-Master Projects\Lischerong Enterprises and Holdings (LEH)\S. Mint Street\Mercury Assessment\Table\Mercury Data
10/23/2020
Table 1 (Page 1 of 1)
Hart & Hickman, PC
TITLE
PROJECT
SITE LOCATION MAP
QUALITY PRODUCTS1513, 1515, AND 1521 S. MINT STREET
CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE:
10-14-20 0
1LEH-004
SITE
0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAP
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
CHARLOTTE EAST, NORTH CAROLINA, 1991
PIRTEK SOUTHEND
SSV-1
SSV-4
SSV-2
V
A
C
A
N
T
V
A
C
A
N
T
SSV-3
REVISION NO. 0DATE: 10-22-20
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
JOB NO. LEH-004 FIGURE NO. 2
QUALITY PRODUCTS 1513, 1515, AND 1521 S. MINT STREET
CHARLOTTE, NORTH CAROLINA
SAMPLE LOCATION MAP
LEGEND
BROWNFIELDS PROPERTY BOUNDARY
FORMER BUILDING FOOTPRINT
SUB-SLAB MERCURY VAPOR SAMPLELOCATIONS
NOTES:
1. AERIAL IMAGERY OBTAINED FROM MECKLENBURG CO. GIS(2019).
2. SUB-SLAB MERCURY VAPOR SAMPLING CONDUCTED ONSEPTEMBER 22, 2020.WESTWOOD AVENUE
S. MI
N
T
S
T
R
E
E
T
S:\AAA-Master Projects\Lischerong Enterprises and Holdings (LEH)\S. Mint Street\Mercury Assessment\Site Map.dwg, SV MAP, 10/22/2020 10:50:24 AM, SVincent

Appendix A Sub-Slab/Soil Gas Vapor QA/QC Field Form
N/A
N/A
N/A
N/A

Appendix B Analytical Laboratory Report
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
October 1, 2020
Greg Kanellis
Hart & Hickman - Charlotte, NC
2923 South Tryon Street, Suite 100
Charlotte, NC 28203
Project Location: Charlotte, NC
Client Job Number:
Project Number: LEH-004
Laboratory Work Order Number: 20I1233
Enclosed are results of analyses for samples received by the laboratory on September 24, 2020. 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 16
39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL SUMMARY
10/1/2020Hart & Hickman - Charlotte, NC
2923 South Tryon Street, Suite 100
Charlotte, NC 28203
ATTN: Greg Kanellis
LEH-004
20I1233
The results of analyses performed on the following samples submitted to the CON-TEST 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
Charlotte, NC
SSV-1 20I1233-01 Sub Slab NIOSH 6009
SSV-2 20I1233-02 Sub Slab NIOSH 6009
SSV-3 20I1233-03 Sub Slab NIOSH 6009
SSV-4 20I1233-04 Sub Slab NIOSH 6009
Blank-1 20I1233-05 Air NIOSH 6009
Blank-2 20I1233-06 Air NIOSH 6009
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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.
NIOSH 6009
Reported results for air samples are calculated based on client sampling and sampling information provided by the laboratory.
The results of analyses reported only relate to samples submitted to the Con-Test 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
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ANALYTICAL RESULTS
Project Location: Charlotte, NC
Date Received: 9/24/2020
Work Order: 20I1233Sample Description/Location:
Field Sample #: SSV-1
Sample ID: 20I1233-01
Sample Matrix: Sub Slab
Sampled: 9/22/2020 13:18
Flow Controller ID:
Air Volume L: 11.94
Sub Description/Location:
Sample Type:
NIOSH 6009
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/TimeTotal g ug/m3
MDL MDL
Mercury ND 0.010 10/1/20 10:52 CJV1ND0.840.0026 0.22
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39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Charlotte, NC
Date Received: 9/24/2020
Work Order: 20I1233Sample Description/Location:
Field Sample #: SSV-2
Sample ID: 20I1233-02
Sample Matrix: Sub Slab
Sampled: 9/22/2020 11:01
Flow Controller ID:
Air Volume L: 11.76
Sub Description/Location:
Sample Type:
NIOSH 6009
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/TimeTotal g ug/m3
MDL MDL
Mercury ND 0.010 10/1/20 10:54 CJV1ND0.850.0026 0.22
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39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Charlotte, NC
Date Received: 9/24/2020
Work Order: 20I1233Sample Description/Location:
Field Sample #: SSV-3
Sample ID: 20I1233-03
Sample Matrix: Sub Slab
Sampled: 9/22/2020 12:10
Flow Controller ID:
Air Volume L: 11.82
Sub Description/Location:
Sample Type:
NIOSH 6009
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/TimeTotal g ug/m3
MDL MDL
Mercury 0.0061 0.010 10/1/20 10:55 CJVJ10.52 0.850.0026 0.22
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39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
ANALYTICAL RESULTS
Project Location: Charlotte, NC
Date Received: 9/24/2020
Work Order: 20I1233Sample Description/Location:
Field Sample #: SSV-4
Sample ID: 20I1233-04
Sample Matrix: Sub Slab
Sampled: 9/22/2020 14:30
Flow Controller ID:
Air Volume L: 12.24
Sub Description/Location:
Sample Type:
NIOSH 6009
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/TimeTotal g ug/m3
MDL MDL
Mercury ND 0.010 10/1/20 10:57 CJV1ND0.820.0026 0.21
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ANALYTICAL RESULTS
Project Location: Charlotte, NC
Date Received: 9/24/2020
Work Order: 20I1233Sample Description/Location:
Field Sample #: Blank-1
Sample ID: 20I1233-05
Sample Matrix: Air
Sampled: 9/22/2020 13:10
Flow Controller ID:
Sub Description/Location:
Sample Type:
NIOSH 6009
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/TimeTotal g ug/m3
MDL MDL
Mercury ND 0.010 10/1/20 10:59 CJV10.0026 2.6
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ANALYTICAL RESULTS
Project Location: Charlotte, NC
Date Received: 9/24/2020
Work Order: 20I1233Sample Description/Location:
Field Sample #: Blank-2
Sample ID: 20I1233-06
Sample Matrix: Air
Sampled: 9/22/2020 13:15
Flow Controller ID:
Sub Description/Location:
Sample Type:
NIOSH 6009
RLResults AnalystAnalyzedDilutionFlag/QualRLResultsAnalyte
Date/TimeTotal g ug/m3
MDL MDL
Mercury ND 0.010 10/1/20 11:00 CJV10.0026 2.6
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39 Spruce Street * East Longmeadow, MA 01028 * FAX [phone] * TEL. [phone]
Sample Extraction Data
Prep Method: NIOSH-NIOSH 6009
Lab Number [Field ID]Batch DateInitial [Filter]Final [mL]
B267701 10/01/201.00 10020I1233-01 [SSV-1]
B267701 10/01/201.00 10020I1233-02 [SSV-2]
B267701 10/01/201.00 10020I1233-03 [SSV-3]
B267701 10/01/201.00 10020I1233-04 [SSV-4]
B267701 10/01/201.00 10020I1233-05 [Blank-1]
B267701 10/01/201.00 10020I1233-06 [Blank-2]
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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
Miscellaneous Air Analyses - Quality Control
QUALITY CONTROL
RL
Total g
Results RL Results Total g
Batch B267701 - NIOSH
Blank (B267701-BLK1)Prepared & Analyzed: 10/01/20
0.010NDMercury
LCS (B267701-BS1)Prepared & Analyzed: 10/01/20
0.010 0.100 74.8-12897.70.0977Mercury
LCS Dup (B267701-BSD1)Prepared & Analyzed: 10/01/20
0.010 0.100 2074.8-12898.2 0.5040.0982Mercury
MRL Check (B267701-MRL1)Prepared & Analyzed: 10/01/20
0.010 0.0100 J80-12086.40.00864Mercury
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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
Raisa A. PetraitisRAP
PDF Management StationSTATION
Lionel RiosLR
Kerry K. McGeeKKM
Corey J. VincentCJV
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CertificationsAnalyte
CERTIFICATIONS
Certified Analyses included in this Report
NIOSH 6009 in Air
NY,AIHAMercury
The CON-TEST Environmental Laboratory operates under the following certifications and accreditations:
Code Description Number Expires
100033AIHA-LAP, LLC - ISO17025:2017AIHA 03/1/2022
M-MA100Massachusetts DEPMA 06/30/2021
PH-0567Connecticut Department of Publilc HealthCT 09/30/2021
10899 NELAPNew York State Department of HealthNY 04/1/2021
2516 NELAPNew Hampshire Environmental LabNH-S 02/5/2021
LAO00112Rhode Island Department of HealthRI 12/30/2020
652North Carolina Div. of Water QualityNC 12/31/2020
MA007 NELAPNew Jersey DEPNJ 06/30/2021
E871027 NELAPFlorida Department of HealthFL 06/30/2021
LL015036Vermont Department of Health Lead LaboratoryVT 07/30/2021
2011028State of MaineME 06/9/2021
460217Commonwealth of VirginiaVA 12/14/2020
2557 NELAPNew Hampshire Environmental LabNH-P 09/6/2021
VT-255716Vermont Department of Health Drinking WaterVT-DW 06/12/2021
25703North Carolina Department of HealthNC-DW 07/31/2021
68-05812Commonwealth of Pennsylvania DEPPA 06/30/2021
9100Dept. of Env, Great Lakes, and EnergyMI 09/6/2021
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