26073_Charlotte Aircraft II_AWP_20240202

03083-001/00513705 [phone]
www.PARTNEResi.com

February 2, 2024

Carolyn Minnich
Brownfields Project Manager
Division of Waste Management
1646 Mail Service Center
Raleigh, NC 27699-1646

Subject: Brownfields Assessment Work Plan
Charlotte Aircraft II
7705 East W.T. Harris Boulevard
Charlotte, North Carolina 28227
NC Brownfields Project No.: 26073-22-060
Partner Project No.: ES22-383966
Dear Ms. Minnich:
On behalf of Northway Multifamily, LLC, Partner Engineering North Carolina, PLLC is pleased to provide a
Brownfields Assessment Workplan for your review regarding the subject property.
If you have any questions concerning the plan, please contact Dave Hunter at [phone].
Sincerely,
Partner Engineering North Carolina, PLLC

Dave Hunter Kristine M. MacWilliams, PE
Regional Technical Director Managing Director – Subsurface Investigation

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TABLE OF CONTENTS
1.0 INTRODUCTION ............................................................................................................................... 1
1.1 Purpose ................................................................................................................................................................................ 1
1.2 Project History ................................................................................................................................................................... 1
2.0 SCOPE OF WORK AND SAMPLING METHODOLOGY .................................................................... 4
3.0 LABORATORY ANALYSES ................................................................................................................ 8
4.0 QUALITY ASSURANCE/QUALITY CONTROL .................................................................................. 9
5.0 INVESTIGATION DERIVED WASTE (IDW) MANAGEMENT ......................................................... 10
6.0 REPORTING .................................................................................................................................... 11

Attachments

Table 1. Summary of Brownfields Assessment Scope

Figures 1. Site Location Map
2. Proposed Development with Assessment Locations

Appendix A Prior Phase II Tables and Figures with Historical Data
Appendix B Attachment 1 Work Plan Approval Signature Page

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1.0 INTRODUCTION
1.1 Purpose
Partner Engineering North Carolina, PLLC (Partner) developed the Brownfields Assessment Work Plan (Work
Plan) on behalf of Northway Multifamily, LLC (Northway), who will be the Prospective Developer (PD), for
the Charlotte Aircraft II project. The Work Plan is designed to fulfil environmental assessment requirements
of the North Carolina Department of Environmental Quality (NCDEQ), Brownfields Redevelopment Section
(NC Brownfields). The Work Plan provides for investigation of subsurface conditions from historical property
use as previously identified and assessed by a Phase I Environmental Site Assessment (Phase I), a Phase II
Subsurface Investigation (Phase II), and from nearby assessment data from the adjacent Former Charlotte
Aircraft #3 site, which was also a NC Brownfields project.
Figure 1 indicates Former Charlotte Aircraft II project location on part of a United States Geological Survey
(USGS) topographic quadrangle map. Figure 2 shows the parcel and proposed assessment locations on a
map with aerial photograph overlays and proposed redevelopment infrastructure.
1.2 Project History
Partner completed a Phase I for the subject property, dated September 9, 2022, on behalf of Northway.
According to the historical sources, the subject property was developed for agricultural use as a commercial
orchard as of 1938 through the early 1960s and used for parts and materials storage associated with the
adjoining aircraft salvage operation from the mid-1960s until at least the 1990s. Storage and use of
hazardous substances relating to these operations, as well as the disposal of related wastes on the subject
property, are unknown. The subject property has consisted of vacant and largely wooded land since storage
use ceased. With the exception of former storage and use by the adjoining aircraft operations, no tenants
have reportedly occupied the subject property.
The following recognized environmental condition (REC) was identified in the Phase I:
• The northeast adjacent property formerly operated with an aircraft salvage operation and wholesale
parts distributor by at least the early 1950s. Prior to the early 1950s, the site was occupied by the
"Delta Airbase," which operated as a flight training school and aircraft maintenance facility. Portions
of the subject property appeared to be used for parts and materials storage associated with the
adjoining aircraft salvage operation from the mid-1960s until at least the 1990s. Storage and use
of hazardous substances relating to these operations, as well as the disposal of related wastes on
the subject property, are unknown. Prior assessments indicated groundwater samples collected
from the former aircraft salvage operation property, the subject property, and adjoining parcels to
the south and west contained detections of volatile organic compounds (VOCs), including
trichloroethene (TCE) and tetrachloroethene (PCE), above the NCDEQ regulatory standards.
Additionally, PCE soil impacts were identified in one sample at an estimated concentration of 4.1
micrograms per kilogram (µg/kg), which is below the applicable Preliminary Soil Remediation Goals
(PSRGs). A Notice of Brownfields Property (NBP) was approved and certified by the NCDEQ on June
26, 2019, and filed with Mecklenburg County on July 9, 2019, for the former aircraft salvage site
(Former Charlotte Aircraft #3 7705 East WT Harris Boulevard Charlotte as NC Brownfields Project
No. 22008-18-060). Thus, a NBP has been recorded for the adjoining site to Northway’s Charlotte

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Aircraft II, and that PD, K Sade, is protected from NCDEQ cleanup liability based on NC Brownfields
liability protections.
Based on Partner’s review of the NC Brownfields documents for the east adjacent aircraft site, groundwater
flow direction was shown to be toward the northwest and potentially cross-gradient to the subject property.
Given the former aircraft and other miscellaneous storage on the subject property associated with the
former aircraft site, including being adjacent to the main part of the aircraft site, the potential exists at
Charlotte Aircraft II for an on-site source area for the previously identified on-site soil and groundwater
impacts. Potential impact at the Charlotte Aircraft II property was supported by a prior soil gas evaluation
on the adjacent Former Charlotte Aircraft #3 property, along the common property boundary. That soil gas
evaluation identified PCE in two soil gas samples at concentrations exceeding the NCDEQ Residential Soil
Gas Screening Levels (SGSLs).
Based on the nearby impact associated with the Former Charlotte Aircraft #3 property, in November 2022
and March 2023, Partner conducted a Phase II at the subject property to evaluate the potential impact of
VOCs, semivolatile organic compounds (SVOCs), and/or metals to soil, groundwater, and/or soil gas as a
consequence of the known release(s) from the northeast adjacent Former Charlotte Aircraft #3 site. The
Phase II was also performed to evaluate the potential for an on-site source for the nearby previously
identified soil, soil gas, and groundwater impacts. The scope of the Phase II included the advancement of
five borings (B1 through B5), installation of five soil gas probes (SG1 though SG5) in November 2022, and
the installation of five temporary monitoring wells (TMW-1 through TMW-5) in March 2023 for soil, soil gas,
and groundwater collection and analysis. During field activities, a permanent groundwater monitoring well
was observed on the western subject property boundary, and an additional groundwater sample was
collected for laboratory analysis. In November 2022, five soil samples and one groundwater sample were
collected analyzed for VOCs, SVOCs, Resource Conservation and Recovery Act (RCRA) metals, and
hexavalent chromium, and six soil gas samples were analyzed for VOCs. In March 2023, two soil samples
and six groundwater samples were analyzed for VOCs, SVOCs, RCRA metals, and hexavalent chromium.
The November 4, 2022, investigation detected PCE in the soil samples collected in the northern part of the
subject property, indicating a limited source area of PCE may exist in that area. Benzene was also detected
in soils on the northern part of the subject property. The reported concentration of cadmium in soil sample
B4 exceeded the NCDEQ Residential Preliminary Soil Remediation Goal (PSRG). The reported concentrations
of hexavalent chromium in each soil sample exceeded the Residential PSRG. However, the concentrations
of cadmium and hexavalent chromium are within the published background ranges (Elements of North
American Soils, Second Edition, Dragun, J. and Chekiri, K, Amherst Scientific Publishers, Amherst,
Massachusetts, 2005), indicating these detections are likely naturally occurring rather than the result of a
release or releases from the subject property. Methylene chloride was detected in each soil sample collected
on November 4, 2022. However, given the analytical qualifier as a “Common Laboratory Contaminant” and
the consistency of the methylene chloride detections for the soil samples, these exceedances were likely
due to laboratory cross-contamination.
From the March 2023 investigation, PCE was detected above the NCDEQ groundwater standards at Title
15A, North Carolina Administrative Code (NCAC) Subchapter 02L, Section .0202 (2L Groundwater Standards)
in samples from TMW-1, TMW-2, and TMW-2 (DUP). Furthermore, 1,2-dichloroethane, PCE, and TCE were

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detected above the 2L Groundwater Standards in the sample from TMW-4. Iron in groundwater sample
MW (a pre-existing monitor well), hexavalent chromium in groundwater samples TMW-1 and TWM-5, and
lead in groundwater sample TMW-1 were also detected above the 2L Groundwater Standards.
SGSL exceedances of benzene, chloroform, ethylbenzene, and PCE were detected in the soil gas samples
predominantly in the northern part of the subject property, with the exception of one benzene SGSL
exceedance in the central part of the subject property. Risk calculator results indicate unacceptable non-
carcinogenic risks in the residential use scenario for the subject property.
Subsurface lithology encountered during the subsurface investigation consisted of sandy silt, silty to sandy
clay, clayey silt, and clay from the ground surface to approximately 40 feet below ground surface (bgs),
which was the maximum depth explored. Groundwater was measured in temporary monitoring wells TMW-
1 through TMW-5 between 19.5 and 23 feet bgs. Based on the calculated groundwater elevations, the site
lies across a groundwater divide so that groundwater flow direction is to the northwest in the northern part
of the subject property and west-southwest in the southern area of the subject property.
Based on the findings of the Phase II, evidence of a potential release was identified in the northern part of
the subject property. Furthermore, evidence of migration of impacted groundwater from the northeast
adjacent property was identified. The findings indicate mitigation of the direct contact and ingestion
exposure pathways and the soil gas-to-indoor air pathway for vapor intrusion should occur during
redevelopment. Management would be based on NC Brownfields Environmental Management Plan (EMP)
requirements. Appendix A provides historical data tables and figures from the prior Phase IIs.
To address potential environmental conditions associated with historical on-site and off-site operations,
Northway submitted a Brownfields Property Application to NC Brownfields on October 12, 2022. NC
Brownfields provided a Letter of Eligibility dated May 2, 2023, and designated the project as NC Brownfields
project number 26073-22-060.

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2.0 SCOPE OF WORK AND SAMPLING METHODOLOGY
Northway and Partner intend for the Brownfields Assessment Work Plan to evaluate potential data gaps
from previous investigations and establish requirements related to site redevelopment and potential
environmental impact at the Former Charlotte Aircraft II property. The Work Plan addresses Brownfields
Redevelopment Section subsurface investigation of environmental conditions from historical on- and off-
site uses as identified during Phase I, Phase II, and prior reporting on the adjacent Former Charlotte Aircraft
#3 site.
Figure 2 shows the proposed Brownfields Assessment soil and soil gas sample locations for the following
investigation, and Table 1 provides a Summary of Investigation Scope:
• Composite and individual grab soil sampling throughout the subject property for exposure
assessment and potential waste characterization, including areas of proposed apartment buildings,
parking areas, and stormwater management features.
• Soil gas sampling within the footprints of proposed apartment buildings.
The project redevelopment is not expected to encounter groundwater, and no groundwater use is
anticipated at the property. These planned use conditions indicate that inclusion of prior site and vicinity
groundwater environmental information in the Brownfields Assessment Report will be appropriate, and no
further assessment of groundwater will be conducted for the project.
Partner will assess the soil and soil gas using standard NC Brownfields assessment protocol. The work will
be conducted in general conformance with applicable regulatory guidance documents:
• NC Brownfields Environmental Site Assessment Work Plan Minimum Requirements Checklist
(November 2018);
• NCDEQ Division of Waste Management (DWM) Vapor Intrusion Guidance (VI Guidance; March
2018);
• The NCDEQ Inactive Hazardous Sites Branch (IHSB) Guidelines for Assessment and Cleanup of
Contaminated Sites (September 2023); and
• The current United States Environmental Protection Agency (EPA) Region IV Science and Ecosystem
Support Division (SESD) Field Branches Quality System and Technical Procedures.
The performance of a vapor intrusion mitigation design in tandem with the Brownfields EMP is anticipated
prior to redevelopment and after completion of the NC Brownfields Assessment Report.
Appendix B contains Attachment 1, the NC Brownfields Assessment Work Plan Approval Signature Page.
Health and Safety Plan
The proposed work may involve hazardous conditions and potential contact with hazardous substances. To
mitigate risk and meet safety regulations, Partner will develop a Health and Safety Plan (HASP) that is
specific to the subject property. The HASP will conform to the Occupational Safety and Health
Administration (OSHA) requirements, under Hazardous Waste Operations & Emergency Response in Title
29 Code of Federal Regulations, Section 1910.120. The HASP is designed to reduce the risk and impact of
physical or chemical exposure that may affect workers at the property. The HASP will include information

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about chemicals expected on the site, health and safety procedures for working on site, and emergency
response procedures.
Utility Locate
As required by law, Partner will contact the North Carolina one call center for underground utilities location
at least three working days prior to beginning intrusive subsurface activities. Additionally, Partner will retain
a private utility locator to evaluate the assessment locations for underground utilities. Partner will review
relevant available site plans provided by the owner or others to further understand locations and other
conditions related to buried utilities. Given the precautions, Partner will not accept liability from damages
arising from any harm to or disruption of utilities caused by the site work.
Soil Assessment
Thirty-five soil borings, grouped in seven separate evaluation areas (Areas 1 through 7), will be installed
using a direct push drill rig as shown on Figure 2. Macro-core or equivalent samplers will be driven to the
total depth of soil sampling, which is expected to be approximately 4 feet bgs or until direct push boring
refusal across the entire property. An exception will be made so that three of the 35 soil borings (B4B, B4D,
and B4E – in the area of a proposed stormwater basin that may be excavated as part of site redevelopment)
will be extended to 10 feet bgs. Soil samples will be collected in acetate liners using tooling with the direct
push rig. Each approximate two-foot depth interval will be described in field notes using environmental
industry standards and screened for human sensory observations and field instrument indications of
potential impact. The field instrument will be a properly maintained Mini-Rae, or equivalent, photoionization
detector (PID), which will be field calibrated to a 100 parts per million vapor (ppmv) standard for isobutylene
gas.
For each of the seven separate evaluation areas, soil from each boring will be depth-interval composited
from the upper four feet and combined with the other samples in that area to produce a 0 to 4-foot
composite sample for the individual area. A separate grab sample from 0-4 feet in one of the borings from
each evaluation area will be gathered based on field indications for analysis of VOCs (e.g., visual, olfactory,
and/or PID readings). Aliquots of 0 to 2 feet bgs in each boring will be collected and placed on hold from
each of the 35 borings as well. For three borings in the area of the stormwater retention pond (B4B, B4D,
and B4E), individual soil grab samples, one per boring, will be collected from borings within the proposed
stormwater retention basin at depths anticipated to be below the 4-foot composite depth interval for Area
4 and above the maximum anticipated depth of excavation for the stormwater basin.
Seven composite samples and ten grab samples with an assumed two duplicates (one for each day of field
operations) will be analyzed for a total of 19 soil samples. An additional 35 aliquots, or one each from the
upper two feet in each boring, will be placed on hold, pending initial analytical results. The composite soil
samples will be analyzed for the standard NC Brownfields analytical suite (SVOCs, RCRA metals, and
hexavalent chromium) by methods discussed in Section 3.0. One grab sample per evaluation area from 0 to
4 feet bgs from a single boring in each area will be analyzed for VOCs-only based on field determination of
most likely location for impact, and the VOC grab sample from each evaluation area will be gathered in a
separate container from composite samples. The results are intended to provide data for management of
the spoils from the planned stormwater basin excavation and from general grading as part of EMP
compliance.

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The selected samples will be packed in labeled, commercial laboratory-supplied containers with appropriate
preservative; placed on-ice in a cooler; entered into formal chain-of-custody; and shipped to the North
Carolina-accredited laboratory for analysis by methods discussed in Section 3.0. The laboratory will initially
analyze the 12 soil samples for VOCs, 12 samples for SVOCs, 12 samples for RCRA metals, and 12 samples
for hexavalent chromium (including duplicates). The 35 shallow, on-hold soil aliquots will be evaluated for
potential compositing and analysis based on the initial analyses. Soil cuttings from the boreholes will be
collected and held pending characterization if field indications of impact are encountered.
Soil Gas Assessment
Partner and a drilling subcontractor will advance nine shallow soil gas monitoring points (SGMPs)
throughout the proposed area development, with three borings located within each individual building
footprint. Each proposed building has a ground-floor footprint of approximately 9,000 square feet, so that
each SGMP will roughly evaluate a building footprint of 3,000 square feet. Figure 2 indicates the location
of the planned buildings and the proposed SGMPs (SGMP6 through SGMP14).
Each SGMP will be installed to a total depth of at least 6 feet bgs and will include a basal interval of less
than 1-foot containing a stainless steel collection point bracketed with sand pack and a bentonite seal. The
gas collection screens will be connected to ground surface with a ¼-inch diameter section of polyethylene
tubing terminated at a petcock in a manhole, similar to monitor well surface finish in 18-inch square
concrete well pads.
After allowing at least 24 hours for stabilization after installation, a soil gas sampling event will be conducted
for the SGMPs using the following protocol. Prior to sampling, seal efficacy and leak checks will be
conducted at each SGMP using a shroud, helium gas, tubing, and sample tube valving. The efficacy check
is a form of quality control to minimize inclusion of ambient atmosphere into soil gas that is being assessed.
The shroud will be affixed around the SGMP surface, and the ¼-inch tubing leading to the subsurface
interval will be connected to a three way valve, which accesses the shroud interior, the subsurface, and a
collection point. The shroud interior will be filled with helium, and the subsurface will be purged of more
than three annular volumes, using a syringe at 200 milliliters per minute (ml/min) or less. At each location,
at least three volumes of sampling train and probe will be purged during the efficacy testing, and the tubing
connected downhole will be collected into a Tedlar bag at the sampling discharge. The valve will be toggled
to the shroud location, the shorter line will be purged, and a sample of shroud atmosphere will be collected
in a syringe or a separate Tedlar bag. Measurements of helium concentrations with a calibrated helium
detection instrument will be collected from the Tedlar bags. If the purged gas from the subsurface contains
less than 10 percent of the helium concentration in the shroud, the interval will be deemed suitably sealed
and available for soil gas collection. Locations that fail efficacy tests will be noted, re-purged, and re-tested.
If a point continues to fail efficacy testing, the point will not be used for sample collection and analysis.
To assure summa canister viability prior to sampling and after delivery from the laboratory, a field check
will be conducted to assure less than a 10 percent loss from assumed maximum vacuum (30 inches of
mercury), so that a vacuum of at least 27-inches of mercury is confirmed after delivery from the laboratory
and prior to collection. Any canisters that fail the viability check will not be used for sampling. After
successful seal efficacy and summa viability check, Partner will attach a laboratory provided, batch-certified,
stainless-steel summa canister to the sample tubing. The canister will be equipped with a choke that assures

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that the sample will be collected at a flow rate of less than 200 ml/min. Summa canister pressures will be
collected using a vacuum gauge attached to the choke. The vacuum readings will be recorded upon receipt;
prior to sampling; upon closing the valve at the end of sampling with vacuum of at least 5-inches of mercury
preserved for transport; and by the laboratory upon their receipt to assure that the sample is not
compromised during transport. Lack of vacuum if found by the laboratory could result in sample rejection.
One location will be selected for collection of a field duplicate sample to satisfy a NC Brownfields quality
assurance metric using at T-valve arrangement. Once complete, the 10 closed canisters will be entered into
chain-of-custody and shipped to a National Environmental Laboratory Accreditation Program (NELAP)-
accredited laboratory to analyze for VOC constituents by the method discussed in Section 3.0.

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3.0 LABORATORY ANALYSES
The analyses for the Brownfields Assessment will be performed by a reputable environmental laboratory,
which has applicable North Carolina accreditations. The following analytical will be conducted for the
various samples:
• Twelve soil samples for VOCs by EPA Method 8260, 12 samples for SVOCs by EPA 8270, 12 samples
for hexavalent chromium by EPA Method 7199, and 12 samples for RCRA metals by various EPA
Methods (including duplicates). The 35 shallow, on-hold aliquots will be retained and evaluated for
potential compositing and analysis based on the initial analyses. Initial analyses should be complete
within the hold-time for the 35 aliquots so that they have acceptable quality conditions if analysis
is necessary.
• Ten soil gas samples (including duplicate) will be analyzed for full list VOCs, including naphthalene,
via EPA Method TO-15.
No short holding time limits or other conditions that could adversely affect the analysis are anticipated.
Particular attention will be given to packing coolers with sufficient ice, and we will plan shipping to avoid
long travel time that could result in samples warming above 4 degrees Celsius. Analytical reporting limits
will be specified to match screening or regulatory criteria for NC Brownfields, and if technical feasibility for
reporting limits cannot be met, method detection limits with estimated concentrations (J-flags) will be used
for criteria comparisons. The analyses will be conducted and reported under Level II quality assurance and
quality control (QA/QC). Chain-of-custody protocol will be observed as discussed in Section 2.0, and sample
coolers will be shipped with ice and temperature blanks for laboratory confirmation of chilled samples. The
coolers will also be affixed with custody seals to assure tamper free shipping.

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4.0 QUALITY ASSURANCE/QUALITY CONTROL
Partner will conduct QA/QC using industry standard methods and regulatory/guidance-specified means
indicated in Section 2.0 above. Basic quality related activities will occur such as properly documenting work;
assuring operation at correct locations; donning and changing Nitrile gloves by field personnel including
subcontractors between locations and tasks; appropriate calibration of field instruments; proper sample
management; and decontamination of tools and equipment between tasks and locations. Duplicates will be
collected at a rate of one duplicate per 20 samples, per method, per day of sampling according to NC
Brownfields requirements. Certain QA/QC intrinsic to the Scope, Methodology and Laboratory are discussed
above. A detailed QA/QC Plan has been created under separate cover.

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5.0 INVESTIGATION DERIVED WASTE (IDW) MANAGEMENT
Most soil sampling locations will generate minor amounts of investigation derived waste (IDW). For
locations where the waste is soil with no field indications of impact, the IDW will be spread in a thin layer
across the ground surface near the sampling point. If debris from the subsurface or other indications of
impact are encountered with the IDW, the material will be collected into labeled 55-gallon drums and staged
at the subject property. The IDW will be sampled and analyzed as appropriate for waste characterization. If
impact above screening or regulatory levels is present, the IDW will be disposed at a suitable facility;
otherwise, the soils will be thin spread near the assessment locations.

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6.0 REPORTING
Partner will produce a Brownfields Assessment Report documenting the findings from the planned
investigation. The report will contain a description of site activities, a discussion of findings, conclusions,
and recommendations in relation to NC Brownfields guidance and procedures as derived from field data. If
deviations from the work plan occur during field activities, a discussion of rationale for the changes will be
provided. The report will also contain figures indicating sample locations for each media with graphic scale
and north arrow, schematics of the installations, and tables documenting the data gathered during the field
activities, analytical data per sampled and analyzed media, and comparison to applicable screening or
regulatory levels. The report will include use of the Division of Waste Management risk calculator for
evaluation of worst-case soil gas conditions. The report will append field notes and instrument calibration,
service records, and other appropriate documentation. The report will include the Partner professional
engineering corporate license number and the seal and signature of the licensed professional in responsible
charge of the project.

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TABLE
Sample Locations Sample Type Sample Objectives Sample Depth Intervals
(ft bgs)
Number
of
Samples
Analysis
Soil - Composite (Five Aliquots)0-4'1 SVOCs, RCRA Metals, Cr+6
Soil - Grab (One Sample from
Evaluation Area Pending Field
Observations)
0-4'1 VOCs
Soil - Grab
(Aliquots from individual borings)0-2'5
Possible VOCs, SVOCs, RCRA Metals, Cr+6
(Held by Laboratory Pending Composite
Analysis)
Soil - Composite (Five Aliquots)0-4'1 SVOCs, RCRA Metals, Cr+6
Soil - Grab (One Sample of Evaluation
Area Pending Field Observations)0-4'1 VOCs
Soil - Grab
(Aliquots from individual borings)0-2'5
Possible VOCs, SVOCs, RCRA Metals, Cr+6
(Held by Laboratory Pending Composite
Analysis)
Soil - Composite (Five Aliquots)0-4'1 SVOCs, RCRA Metals, Cr+6
Soil - Grab (One Sample of Evaluation
Area Pending Field Observations)0-4'1 VOCs
Soil - Grab
(Aliquots from individual borings)0-2'5
Possible VOCs, SVOCs, RCRA Metals, Cr+6
(Held by Laboratory Pending Composite
Analysis)
Soil - Composite (Five Aliquots)0-4'1 SVOCs, RCRA Metals, Cr+6
Soil - Grab (One Sample of Evaluation
Area Pending Field Observations)0-4'1 VOCs
Soil - Grab
(Aliquots from individual borings)0-2'5
Possible VOCs, SVOCs, RCRA Metals, Cr+6
(Held by Laboratory Pending Composite
Analysis)
Soil - Grab (Area of Retention Pond;
Proposed Sub-Borings B, D, & E))>4'3 RCRA Metals, Cr+6, VOCs, SVOCs
Soil - Composite (Five Aliquots)0-4'1 SVOCs, RCRA Metals, Cr+6
Soil - Grab (One Sample of Evaluation
Area Pending Field Observations)0-4'1 VOCs
Soil - Grab
(Individual Aliquots of Composite)0-2'5
Possible VOCs, SVOCs, RCRA Metals, Cr+6
(Held by Laboratory Pending Composite
Analysis)
Soil - Composite (Five Aliquots)0-4'1 SVOCs, RCRA Metals, Cr+6
Soil - Grab (One Sample of Evaluation
Area Pending Field Observations)0-4'1 VOCs
Soil - Grab
(Individual Aliquots of Composite)0-2'5
Possible VOCs, SVOCs, RCRA Metals, Cr+6
(Held by Laboratory Pending Composite
Analysis)
Table 1
Summary of Brownfields Assessment Scope
Brownfields Assessment Work Plan
Charlotte Aircraft II - NC Brownfields Number 26073-22-060
7705 East W.T. Harris Boulevard
Charlotte, North Carolina
Partner Project Number ES22-383966
North Part of Site
(Sub-Borings A-E)Evaluation Area 1
Evaluation Area 2 West-Central Part of Site
(Sub-Borings A-E)
Evaluation Area 6 Southwest Part of Site
(Sub-Borings A-E)
Evaluation Area 3 East-Central Part of Site
(Sub-Borings A-E)
Evaluation Area 5 East-Southeast Part of Site
(Sub-Borings A-E)
West-Southwest Part of Site
(Sub-Borings A-E)Evaluation Area 4
Sample Locations Sample Type Sample Objectives Sample Depth Intervals
(ft bgs)
Number
of
Samples
Analysis
Table 1
Summary of Brownfields Assessment Scope
Brownfields Assessment Work Plan
Charlotte Aircraft II - NC Brownfields Number 26073-22-060
7705 East W.T. Harris Boulevard
Charlotte, North Carolina
Partner Project Number ES22-383966
North Part of Site
(Sub-Borings A-E)Evaluation Area 1
Soil - Composite (Five Aliquots)0-4'1 SVOCs, RCRA Metals, Cr+6
Soil - Grab (One Sample from
Evaluation Area Pending Field
Observations)
0-4'1 VOCs
Soil - Grab
(Individual Aliquots of Composite)0-2'5
Possible VOCs, SVOCs, RCRA Metals, Cr+6
(Held by Laboratory Pending Composite
Analysis)
SGMP6 through SGMP14 Soil Gas
Vapor Intrusion Risk
Evaluation at Proposed
Structures
5-6'9 VOCs via EPA Method TO-15
Duplicate - Field
Determination Soil QA/QC TBD 2
VOCs, SVOCs, RCRA Metals, Cr+6
(Evaluation Area[s] and possible grab for
>4' in Area 4
Duplicate - Field
Determination Soil Gas QA/QC TBD 1 VOCs via EPA Method TO-15
Notes:
ft bgs = feet below ground surface
RCRA Metals = Resource Conservation and Recovery Act Metals by EPA Method 6020 and 7424
Cr+6 = Hexavalent Chromium by EPA Method 7199
VOCs = Volatile Organic Compounds by EPA Method 8260B for soil and groundwater, by EPA Method TO-15 for soil Gas
SVOCs = Semivolatile Organic Compounds by EPA Method 8270D
Vapor sample intervals at 5 and 10 ft bgs are 1 foot in thickness
TBD = To Be Determined, generally based on field decision
N/A = Not Applicable
SGMP = Soil Gas Monitoring Point
Evaluation Area 7 Southeast Part of Site
(Sub-Borings A-E)

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FIGURES
SITE
Title:
Figure:Prepared By:Date:Project Number:
Address:
Site Location Map
1 AD January 2024 ES23-383966
Charlotte Aircraft II
7705 East W.T. Harris Boulevard
Charlotte, North Carolina 28227
Legend and Notes:
0'500'500'1,000'
Approximate Scale
Site Boundary Reference: USGS 7.5-Minute Map, Mint Hill, North Carolina. Dated
2022.
Contour Interval 10 Feet
© 2023 Microsoft Corporation © 2023 Maxar ©CNES (2023) Distribution Airbus DS
Title:
Figure:Prepared By:Date:Project Number:
Address:
Development Plan with Proposed
Assessment Locations
2 AD January 2024 ES22-383966
Charlotte Aircraft II
7705 East W.T. Harris Boulevard
Charlotte, North Carolina 28227
Legend and Notes:
0'75'75'150'
Approximate Scale
Site Boundary
Proposed Soil Gas Sample Location
Proposed Soil Sample Location
- Site Conceptual layout provided by V3 Southeast.E W.T. Harris Boulevard1
2 3
4
5
6
7
Soil Composite Areas#
A
A
A
A
A
A
A
B
B B
B
B
B B
C
C
C
C
C
C
C
D
D
D
D
D
D
D
E
E
E
E
E
E E
SGMP6
SGMP7
SGMP8
SGMP9
SGMP10
SGMP11
SGMP12
SGMP13
SGMP14

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APPENDIX A: PRIOR PHASE II TABLES AND FIGURES WITH HISTORICAL DATA

03083-001/00513705

APPENDIX B: ATTACHMENT 1 WORK PLAN APPROVAL SIGNATURE PAGE

02/02/2024
704-661-0330