25001_Dynatech_ WP&Approval_ 20210609

June 9, 2021
Sent Via E-mail Mr. David Hunter Partner Engineering North Carolina, PLLC
8270 Red Oak Blvd, Suite 528 Charlotte, NC 28217 [e-mail] Subject: Work Plan Approval
Dynatech II Brownfields Property Charlotte, Mecklenburg County Brownfields Project No. 25001-21-060 Dear Mr. Hunter:
The North Carolina Department of Environmental Quality (DEQ) Brownfields Program received the Brownfields Assessment Work Plan Rev 1 dated June 8, 2021(Work Plan). DEQ Brownfields comments to previous revision dated May 17, 2021 of this Work Plan have been addressed;
therefore, the Work Plan is approved.
Please be advised that this approval from DEQ Brownfields does not waive any applicable requirement to obtain any necessary permits, licenses or certifications which may be required from other state or local entities. If you have any questions, please feel free to contact me at 704-661-
0330, or via e-mail at [e-mail]
Sincerely,

Carolyn Minnich Brownfields Project Manager ec: Wes McAdams [e-mail]
Mason Ellerbe [e-mail]
Chang, Michael [e-mail] Chris Walker [e-mail]

01699-007/00300953

800-419-4923 www.PARTNEResi.com

June 8, 2021

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

Subject: Brownfields Assessment Work Plan
Former Dynatech Parcel and Multifamily Parcels
Dynatech II Brownfields Project
2207, 2213, 2301, 2315, 2320, and 2325 Toomey Avenue
and 704 West Tremont Avenue
Charlotte, North Carolina 28203
Partner Project Number: 21-370620
Brownfields Project Number 25001-21-060
Dear Ms. Minnich:
On behalf of Abacus Acquisitions, LLC (Abacus), Partner Engineering North Carolina, PLLC (Partner) is
pleased to provide a Brownfields Assessment Work Plan regarding the referenced property for your review.
The Brownfields Assessment follows the previously proposed methane assessment for the former Dynatech
and multifamily portions of the project on the overall Dynatech II mixed use project.
If you have any questions concerning the plan, please contact Dave Hunter at [phone].
Sincerely,
Partner Engineering North Carolina, PLLC

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

Michael Chang
Relationship Manager
Brownfields Assessment Work Plan Partner Project Number: 21-370620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021

01699-007/00300953
TABLE OF CONTENTS
1.0 INTRODUCTION ............................................................................................................................... 1
1.1 Project Information and Recent Activity ................................................................................................................. 2
1.2 Background ........................................................................................................................................................................ 2
2.0 SCOPE OF WORK ........................................................................................................................... 6
3.0 SAMPLING METHODOLOGY .......................................................................................................... 8
4.0 LABORATORY ANALYSES .......................................................................................................... 11
5.0 QUALITY ASSURANCE/QUALITY CONTROL ............................................................................. 12
6.0 INVESTIGATION DERIVED WASTE (IDW) MANAGEMENT ....................................................... 13
7.0 REPORTING ................................................................................................................................... 14

ATTACHMENTS

Tables 1. Sample Summary Table

Figures 1. Property Location Map
2. Proposed Sample Location Map and Historical Sample Locations
3. Proposed Environmental Management Sample Locations

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 1

1.0 INTRODUCTION
Partner developed the Brownfields Assessment Work Plan on behalf of Abacus to evaluate the Dynatech II
Brownfields project – consisting of the former Dynatech parcel, multifamily parcels adjoining and near the
former Dynatech parcel, and an adjacent commercial property – for recognized environmental conditions
and other potential environmental impact. The Dynatech II project lies adjacent to the north and northeast
of the intersection of Toomey Avenue and West Tremont Avenue in the South End area of Charlotte, North
Carolina.
The work plan addresses Brownfields Program subsurface investigation of environmental conditions from
historical property use as identified during Phase I Environmental Site Assessments (Phase Is), Phase II
Subsurface Investigations, and a geotechnical investigation. Potential methane impact from buried debris
at the project is being assessed through a separate North Carolina Department of Environmental Quality
(NC DEQ) Brownfields Program-approved Methane Assessment Work Plan. The Methane Assessment will
be completed prior to performance of the Brownfields Assessment Work Plan.
Abacus and Partner intend for the Brownfields Assessment Work Plan to complete potential data gaps from
previous investigations and establish requirements related to site redevelopment and environmental
impact, other than methane, at the Dynatech II Brownfields property:
• Assessment of shallow groundwater conditions near and downgradient from the former Dynatech
facility and plating waste disposal at an adjacent property septic system using permanent monitor
wells;
• Soil investigation near the former septic system disposal location and near the Dynatech facility to
evaluate extent of soil impact;
• Evaluation of soil gas volatile organic compounds (VOCs) near a prior location on the northern part
of the property. The methane soil gas points would be used for the shallow and medium depth
soil gas samples; and
• Evaluation of soil and debris conditions in areas of civil and grading redevelopment to assure
proper management of construction and demolition (C&D) material and other potential
environmental impact. The assessment is designed to match preliminary cut and fill volume
estimates in relation to redevelopment areas and locations with pre-defined debris.
Partner will assess the soil, groundwater, and soil gas using standard North Carolina Brownfields Program
assessment protocol, including analysis for Resource, Conservation and Recovery Act (RCRA) metals, VOCs,
and semi-VOCs (SVOCs). The assessment of soil and debris conditions will provide characterization in
compliance with North Carolina Brownfields and North Carolina Waste Management guidelines and
regulations. Figure 1 indicates the Dynatech II project location. Figure 2 shows the individual parcels,
including the planned recombination configuration and work plan sampling locations, with aerial photo and
planned redevelopment overlays.

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 2

1.1 Project Information and Recent Activity
Dynatech II Brownfields project lies near and to the northeast of the intersection of I-77 and Remount Road,
near the southern extent of the redeveloped area of South End. The area contains commercial, light
industrial, residential, and vacant land, which was previously developed. The project may include the
aggregation of properties for mixed use redevelopment with potential amendment to the current
Brownfields application for property assemblage and Prospective Developers. The current project makeup
includes:
• Five properties with addresses of 2207, 2301, 2315 (728 W Tremont), and 2325 Toomey Avenue and
704 West Tremont Avenue, which are slated for redevelopment with multifamily housing in five
buildings. The properties currently contain three buildings totaling 15,664 square feet on 6.712
acres and is known as the multifamily parcels.
• An affiliate of the Prospective Developer joined the project with addition of the Dynatech
Brownfields Property at 2213 Toomey Avenue for commercial mixed use. The former Dynatech
facility contains a 34,427 square foot industrial building on 2.089 acres and is subject to an existing
Brownfields Agreement.
• Addition of 2320 Toomey Avenue is planned for commercial mixed use. The property contains a
74,336 square foot light industrial building on 4.198 acres.
The Dynatech II project received a Letter of Eligibility (LOE) from the Brownfields Program dated February
5, 2021. The letter verifies that the intended redevelopment may include multi-family residential, industrial,
office, parking, retail, warehousing, commercial, recreational, and institutional uses. The LOE noted prior
Partner Phase Is dated June 8, 2020 for the 2213 Toomey Avenue parcel (former Dynatech facility) and
December 11, 2020 for the multifamily parcels. The LOE also noted that prior Brownfields Property
information from the NC DEQ may be used during the evaluation process and requested additional
information on the properties that Abacus could provide. Abacus submitted the following prior reports to
the Brownfields Program on February 26, 2021:
• Methane analytical data from August 2020 for 2213 Toomey Avenue;
• Phase I Environmental Site Assessment dated November 2, 2020 – 2320 Toomey Avenue;
• Phase II Subsurface Investigation dated December 17, 2020 – 2320 Toomey Avenue;
• Phase II Subsurface Investigation dated February 12, 2021 – Multifamily Assemblage
• Geotechnical Report dated January 19, 2021 – Multifamily Assemblage
• Geotechnical Report Addendum 1 dated February 22, 2021 – Multifamily Assemblage

The Brownfields Program approved the Methane Assessment Work Plan on April 26, 2021, and the field
work has been completed, with a report pending.
1.2 Background
The following discussion outlines the environmental conditions likely to affect the three main parts of
project property:

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 3

Multifamily Parcels
The December 2020 Phase I provided history of the multifamily assemblage that indicated use from 1931
through 2014 as single family residential properties and a commercial building (2315 Toomey/728 West
Tremont) and former use as row houses for multifamily residential (704 West Tremont) by 1943. The row
houses, one of the single family residences, and the former commercial building were razed by 1993. The
existing warehouse was constructed on the south parcel in 1994. Prior and current tenants for the
multifamily parcels did not include businesses suggestive of recognized environmental conditions (RECs).
The site reconnaissance of the 2207 Toomey Avenue parcel found above-ground storage tanks (ASTs) and
55-gallon steel drums in an area with heavy vegetation that prevented observations of soil conditions that
might have indicated releases. The presence of drums and ASTs therefore constituted a REC.
The multifamily parcels had a REC in relation to potential migration of methane impact from the
southeastern-adjacent Adams Property at 510 West Tremont Avenue. The Adams Property has limited
subsurface impact by metals, petroleum hydrocarbons, semivolatile organic compounds (SVOCs), and
volatile organic compounds (VOCs) which do not appear to have migrated off-property, based on a
separate Brownfields assessment. The Adams Property has a Brownfields LOE but has not yet filed a Notice
of Brownfields Property. The southeast-adjacent Powers Site at 536 West Tremont Avenue operated in the
early 20th Century as a quarry, which was later filled with casting sand, concrete, wood debris, gravel, and
soil from unknown sources. Later operations including manufacturing, as an automotive salvage yard, and
for dumping occurred prior to the site entering the Brownfields Program with a Notice of Brownfields
Property being filed on October 6, 2017. Subsurface impact by metals, petroleum, and SVOCs do not
appear to have left the property, but methane had sufficiently elevated conditions for the resulting
condition to be characterized as REC for the multifamily parcels. The former Dynatech facility discharged
hazardous plating waste to a septic system on the southeastern part of the multifamily parcel, as discussed
below, and the discharge is also considered a controlled REC (CREC).
To address the RECs and CREC related to the multifamily parcels and conditions related to possible buried
debris, Partner conducted a Phase II Subsurface Investigation and a Geotechnical Report with Addendum
for test pits. The environmental analytical included a standard Brownfield Program suite of VOCs, SVOCs,
and Resource Conservation and Recovery Act (RCRA) metals, with the following detections and conclusions
applying to the multifamily parcels:
• Three SVOCs were found in soil at a boring near the septic system on the southwestern part of
the site at concentrations exceeding Residential Preliminary Soil Remediation Goals (PSRGs).
• Arsenic was detected in soil at concentrations exceeding Residential PSRGs near the septic
system and at another boring on the southwestern part of the property. Total chromium was
detected in soil above Residential and Industrial / Commercial PSRGs for each of the soil samples
collected across the property, and hexavalent chromium was detected in the soil sample at the
septic system and in soil at a boring on the northern part of the site above Residential PSRGs.
• Total chromium in groundwater exceeded the North Carolina 2L Groundwater Standard near
the septic system, and total chromium and lead in groundwater exceeded the 2L Groundwater
Standard at a boring on the northwestern part of the property.
Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 4

• Soil gas contained vinyl chloride and benzene above Residential and Non-Residential Sub-Slab
and Exterior Soil Gas Screening Limits (SGSL) and ethylbenzene above Residential SGSLs in a
boring on the northern part of the multifamily parcels. A common ambient air constituent in
urban areas, 1,3-butadeine, was encountered in six of seven samples across the property but is
likely unrelated to site environmental impact.
• Methane was below detections limits for nine of 10 samples and was found at 0.672 percent by
volume (Less than the Brownfields Program threshold criteria of 1.25 percent by volume as a
residential passive mitigation threshold) at a monitoring point on the southwestern part of the
parcels. For reference, methane is considered combustible between a Lower Explosive Limit of 5
percent and an Upper Explosive Limit of approximately 15 percent by volume. Static pressure
was found as an apparent anomaly with uncertain origins at one location; otherwise, the
readings were negligible across the dataset.
• Geotechnical exploration found unsuitable soils for standard construction due to debris (wood,
masonry, etc) to depths between approximately 2 and 8 feet below ground surface (bgs) across
much of the northern part of the parcels and to a depth of 16 feet bgs on the south-central part
of the parcels.
The results of investigations indicate a limited area of SVOC impact associated with the former septic
system; metals impact to soil near the septic system and potentially at other locations surrounding the
former Dynatech facility; and possible groundwater impact by metals. An evaluation of risk for individuals
found pathways not complete for soil and groundwater exposures, and vapor intrusion calculations found
hazard index for residents were below 1.0 . The unsuitable soils with debris constitute a potential source of
methane and an adverse condition in relation to geotechnical considerations.
Dynatech Parcel
According to available historical sources, the Dynatech parcel was formerly undeveloped as early as 1905
and was developed with the existing improvements in 1969. Tenants on the subject property have included
Eastern Transit Storage, a hauling business of household goods (1968-1973); Frank G.W. McKittrick Textile
Machinery, a retail operation of textile machinery (1973-1985); Dynatech Industries, Inc. (1985-1990); RG
Automation/Carolina Custom Tank (1996-Present). Most notably, Dynatech conducted chrome plating of
compressor parts from approximately 1985 to 1990. The facility generated hazardous waste and conducted
illicit discharge of plating waste to a septic system located on the 728 West Tremont Avenue parcel of the
multifamily parcels. Various assessment activities at the Dynatech parcel in the 1990s confirmed metals and
methyl ethyl ketone (MEK) impact to the subsurface. Removal actions by the United States Environmental
Protection Agency (EPA) were conducted for soil, groundwater, and wastewater as one-time remedial
remedies during the early 1990s. Further assessment found that the site warranted a No Further Remedial
Action Planned (NFRAP) status under the federal Superfund Program, with subsequent investigation under
the (NC DEQ), including a Brownfields Assessment, confirming modest subsurface impact above standards.
The site entered the North Carolina Brownfields Program with a Notice of Brownfields Property and
Environmental Land Use Restrictions (ELUR), dated October 23, 2003. Subsequent compliance certifications
show that the restrictions set forth in the ELUR continue to be met. Based on the ELURs and Brownfields
Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 5

property status, the septic system for disposal of hazardous waste on the multifamily parcels constitutes a
CREC for the Dynatech parcel.
Partner conducted methane monitoring at the Dynatech parcel during August 2020 and found no methane
above the method detection limits, which were lower than 5 percent of the LEL for methane. Appendix A
contains prior data tables including methane information from prior assessment at the Dynatech II project,
and Figure 2 indicates the locations of prior testing.
2320 Toomey Avenue Parcel
According to available historical sources, the subject property was formerly undeveloped from as early as
1905; developed with a single-family residence from at least 1938 to circa 1965; and then remained vacant
land from 1967 until the current improvements were constructed in 1971. Tenants on the subject property
have included Delta Knitting Mills Inc. (1974); Service First Inc. (1979); Donl Inc. Athletic Clothing
Manufacturer (1989); Smart Products Incorporated (1999-2004); and Service Metal Inc. (2005-Present).
Current and prior tenants for the 2320 Toomey Avenue parcel did not include business operations likely to
result in RECs; however, the nearby apparently upgradient location of the former Dynatech facility and its
illicit discharge to a septic system on the multifamily parcels constitute a CREC. To evaluate the potentially
adverse environmental condition for 2320 Toomey Avenue, Partner performed a Phase II Subsurface
Investigation. The standard Brownfields Program suite of analytical (VOCs, SVOCs, and RCRA metals) was
performed, with limited detections above standards, and the following conclusions:
• Arsenic, total chromium, and selenium in soil exceeded NC DEQ Residential PSRGs (arsenic and
total chromium), Industrial / Commercial PSRGs (arsenic and total chromium), and the Protection
of Groundwater PSRG (Selenium) at each of the assessment locations, which were located on the
northern end of the parcel.
• Groundwater contained chromium and lead above the 2L Groundwater Standards in unfiltered
samples, only at the location closest to the former Dynatech facility. A filtered sample contained
only total chromium above the 2L Groundwater Standard.
• Soil gas assessment for VOCs, also at the northeastern end of the parcel, found only 1,3-butadiene
above applicable SGSLs. No methane assessment was conducted on the 2320 Toomey Avenue
Parcel; however, no debris has been encountered at the parcel, and areas containing debris and
other Brownfields properties with methane impact (Adams and Powers sites) are distant from the
parcel.
Thus, in addition to the CREC, business environmental risk exists for 2320 Toomey Avenue, because known
metal impacts remain associated with the Dynatech facility.
More detailed discussions of the project and vicinity environmental conditions across the Dynatech II project
properties are provided in previous reports, and Appendix A contains summary tables of prior analytical
data.

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 6

2.0 SCOPE OF WORK
Partner will conduct project mobilization activities including development of a site Health and Safety Plan
for site project personnel in accordance with Occupational Safety and Health Administration (OSHA)
regulations, most specifically United States Code 1910.120 for Hazardous Waste Operations. We will contact
the public utility location service at least three days prior to field activities, and we will also contract with a
private utility locator to clear each assessment location for utilities and potential site subgrade infrastructure
before assessment activities. As a final precaution, the drilling subcontractor will manually clear each
location to a depth of approximately 5 feet (bgs) prior to drilling equipment use.
The Brownfields Assessment will provide evaluation of the following conditions that were previously
identified and partially assessed:
• Shallow groundwater conditions near and downgradient from the former Dynatech facility and on
the southwestern side of the 2320 Toomey Avenue parcel will be investigated with three permanent
monitor wells (MW-1 through MW-4) as indicated on Figure 2. Monitor well MW-1 will be placed
near the adjacent Southern Truck facility to the south of the 2320 Toomey Avenue parcel to evaluate
whether operations at Southern Truck or on the 2320 Toomey Avenue parcel have affected the
subsurface. For MW-2 through MW-4, the intended use will be assessment related to plating impact
from the former Dynatech facility. The monitor wells will be fully developed with low flow sampling
and proper sample management to reduce suspended sediment load and evaluate dissolved
aquifer impact. The wells will access the shallow aquifer at expected depths between 10 and 20 feet
bgs, with the well installation occurring so that approximately seven to 10 feet of the upper aquifer
will be accessed by the well screen. Samples will be analyzed for the eight RCRA metals plus
hexavalent chromium, VOCs, and SVOCs, as indicated on Table 1.
• Soil in the area near the former septic system that was used to dispose of plating waste (B-8 through
B-10) will be assessed to evaluate extent of previously detected metals and SVOCs. At each of the
other monitor wells, B-5/MW-1 through B-7/MW-3, soils at the monitoring well locations will be
assessed at locations shown on Figure 2. The borings will extend to the water table at expected
depths between 10 and 20 feet bgs, and samples will be selected based on field indications of
impact, with each boring contributing at least one sample for analysis and one of the borings being
sampled at two intervals, with analysis for RCRA metals plus hexavalent chromium, VOCs, and
SVOCs as indicated on Table 1. The B-8 through B-10 borings will also be included with the debris
fill and cut investigation samples for later Brownfields Environmental Management purposes, so
that additional sample materials from these locations will be composited for those evaluations.
• Evaluation of soil gas VOCs will occur near a prior location, MSVG-6 on the northern part of the
property, where impact by petroleum and chlorinated solvents was detected above the Division of
Waste Management (DWM) Soil Gas Screening Levels (SGSLs) during the Phase II Subsurface
Investigation. The methane soil gas points at five ft bgs and 10 feet bgs in the vicinity (MSG-15A &
15B, MSG-16A & 16B, MSG-17A & 17B, and MSG-19A & 19B) will be used for to collect shallow
and medium depth soil gas in the vicinity of proposed multifamily residential construction as shown
Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 7

on Figure 2. The vapor samples will be collected in accordance with DWM protocol and analyzed
for VOCs as indicated by Table 1.
• Evaluation of soil and debris conditions will be conducted to assure that the management of
material is planned for construction and demolition (C&D) debris and other potential
environmental impact. The preliminary cut and fill volume estimates as well as known areas and
depths of pre-defined debris have been used to place debris fill or cut (FC) characterization
locations. as shown on Figure 2. Figure 3 shows the site grading plan with the existing topography,
planned final grades, and expected areas of debris fill (marked with a green outline), and Figure 3
depicts the 32 boring locations for the Brownfields Assessment that will be used for prospective
environmental management purposes.
The locations will be sampled continuously from ground surface to depth extent of planned cuts or
to the total depth of debris fill, whichever is greater. The FC boring depths will range from
approximately five to 20 feet bgs, and samples will be collected so that aliquots from similar depth
intervals in groups of three to five borings will be composited with analysis of RCRA metals and
SVOCs. An individual grab sample will be analyzed for VOCs from a relevant worst-case
location/depth interval from each grouping as indicated on Table 1. Partner anticipates sampling
approximately eight groupings of adjoining borings, with composites collected from two depth
intervals in six of the groupings for a total of 14 composite samples for metals and SVOCs and
approximately 14 individual VOC analysis.
The proposed characterization will be conducted so that the Brownfields Assessment will provide
direct data for environmental management of the cut and fill balance from the grading plan. Thus,
we are planning for approximately 9,200 cubic yards (cy) of cut as indicated from the grading plan
and an excess of approximately 5,000 cy of debris fill, for a total of 14,000 cy of potential material
for reuse on-site or proper disposal as C&D or solid waste off-site. The current rough estimated of
potential materials requiring Brownfields Environmental Management (14,000 cy) will match the
DWM and Brownfields Program protocol for composite sampling for management of each 1,000
cy of cut material or debris fill. Additional consultation with project stakeholders and the Division
of Waste Management will be conducted to assure proper characterization and disposal of debris
fill.

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 8

3.0 SAMPLING METHODOLOGY
The Brownfields Assessment activities will provide subsurface soil, groundwater, and soil gas conditions for
the Dynatech II project. The work will be conducted in general conformance with applicable regulatory
guidance documents:
• NCDEQ Brownfields Program 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 (January 2020);
• The current EPA Region IV Science and Ecosystem Support Division (SESD) Field Branches Quality
System and Technical Procedures; and
• North Carolina Well Construction Standards. North Carolina Administrative Code, Subchapter 2C,
Section .100 (October 2009).
The Brownfields Assessment will be conducted by installing soil borings, monitor wells, and soil gas points
as indicated on Figure 2 and Figure 3.
Soil Borings
Soil borings will be installed using rotary auger-capable, track mounted, direct push drill rigs. Macro-core
or equivalent samplers will be driven to the total depth of soil sampling, with samples collected in acetate
liners using four or five-foot tooling. 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) isobutylene calibration gas standard. At the completion of each boring, sample(s) will be selected
based on field and work plan criteria as specified in Table 1; packed in labeled, commercial laboratory-
supplied containers relevant to specific analyses with appropriate preservative; placed on-ice in a cooler;
and entered into formal chain-of-custody with specified analytical requirements.
Soil from borings B-6, B-7, B-8, and B-9 will be collected as grab samples from the interval above the water
table that is deemed most likely to contain impact based on field criteria, and the FC-series borings will be
sampled for environmental management using the depth and compositing criteria discussed above. Depth
specific intervals from B-7, B-8, and B-9 will be composited with soil from similar depths from nearby FC-
series borings for the task that is being performed to aid environmental management during
redevelopment. The samples will be shipped to a North Carolina-accredited laboratory for analysis of RCRA
metals plus hexavalent chromium, SVOCs, and VOCs. Further analytical discussion is provided in Section 4
below.

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 9

Groundwater Monitor Wells
For borings which will also be converted into permanent monitor wells, the boreholes may be over-reamed
with rotary hollow stem augers, so that 2-inch diameter, schedule 40, polyvinyl chloride (PVC) well screen
and casing are installed, with the anticipated design using approximately 10 to 15 feet of 0.010-inch, factory-
slotted well screen at the base of the boring, roughly 7 to 10 feet into the water table, with casing riser to
land surface. Total depths may range from approximately 15 to 25 feet bgs. Number 2 filter sand will be
installed in the borehole annulus surrounding, and approximately 1-foot above, the well screen. One to two
feet of hydrated bentonite seal will be placed in the annulus above the sand pack, and a sodium-bentonite
grout will be installed above the seal to approximately 1-foot bgs. The surface at each permanent monitor
well will completed with an approximately 18-inch square concrete well pad of one-foot thickness
containing a flush-mounted, bolt-down manhole enclosing the monitor well top of casing, which will be
capped with a locking compression fitting.
The wells will be developed by surging and pumping with a portable submersible pump until visibly clearer
water is produced, and the wells will remain undisturbed for a minimum of approximately 4 hours before
purging is conducted. The wells will be purged using a peristaltic pump and new polyethylene tubing. Field
water quality parameters will be collected at approximate five-minute intervals or upon evacuation of each
casing volume of water, whichever occurs sooner, using a properly maintained and calibrated Horiba, or
equivalent, water quality meter, with measurements of temperature, pH, and specific conductivity collected
at the inception and after each time/volume interval. The purging will continue until the field parameters
vary by less than 10 percent between each time/volume interval or until a minimum of five intervals have
occurred. Excess water from development and purging will be disposed on the ground near the well-head
unless overt indications of groundwater impact are observed in the field.
The wells will remain undisturbed for a minimum of 12 hours but not more than 24 hours after purging,
and sampling will be conducted using a peristaltic pump and new polyethylene tubing. Another set of
readings for field parameters, additionally including dissolved oxygen, oxidizing/reducing potential, total
dissolved solids, and turbidity will be collected immediately prior to sampling . Samples for VOCs and SVOCs
will be collected into appropriate, labeled, commercial laboratory-prepared containers with preservative, as
appropriate. Metals samples will be collected into unpreserved commercial laboratory prepared containers.
The containers will be placed under chain-of-custody in a chilled container or refrigerator at less than 4
degrees Celsius for at least 12 hours, then the metals samples will be decanted to separate clear water from
any settled sediment into another labeled, laboratory-prepared container, prior to delivery to the laboratory
as a means for further reduction of suspended solids. Because metals are considered properly preserved by
chilling for up to 14 days, no nitric acid preservative will added to the samples. Samples will be shipped to
a North Carolina-accredited laboratory for RCRA metals plus hexavalent chromium, VOCs, and SVOCs.
Further analytical discussion is provided in Section 4 below.
Soil Gas Samples
Soil gas samples will be collected from MSG points, which will be installed during the Methane Assessment,
under a Brownfields Program-approved work plan. Previous soil gas assessment found impact exceeding
Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 10

the DWM VI SGSLs for benzene, ethylbenzene, and vinyl chloride at former SVGS-6 on the northern part of
the multifamily assemblage. To evaluate the VOC soil vapor conditions in the vicinity of former SVGS-6,
Partner will collect soil gas from MSG-15, MSG-16, MSG-17, and MSG-19 on the northwestern parts of the
property in conformance with the DWM VI Guidance. The installation of the MSG points will include one-
foot intervals containing a permeable polypropylene collection point bracketed with sand pack and
bentonite seals, centered at 5 and 10 feet below ground surface. The gas collection screens will be
connected to ground surface with ¼-inch diameter sections of polyethylene tubing terminated at a petcock
in a manhole, similar to monitor well surface finish. Discussion of the installation details for the MSG points
can be found in the Methane Assessment Work Plan.
Prior to sampling, seal efficacy and leak checks will be conducted at each MSG point slated for VOC analysis
using a shroud, helium gas, 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 MSG point surface, and the ¼-inch tubing lead to the subsurface interval will be connected to
a three way valve, which accesses the shroud interior and subsurface. The shroud interior will be filled with
helium, and the subsurface will be purged of more than three annular volumes from each monitoring zone,
using a syringe or equivalent relatively low flow method. By toggling each valve from closed, to purged
subsurface interval, to shroud interior, gas will be collected into a Tedlar bag for the shroud at the five and
10 feet bgs intervals. Measurements of helium concentrations with a calibrated helium detection instrument
will then be collected from the Tedlar bags while purging each sample point for comparison. At least three
volumes of sampling train and probe will be purged during the efficacy testing with a flow rate of 200
milliliters per minute (ml/min) or less. If the purged gas 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.
After successful seal efficacy and leak check testing, Partner will attach a laboratory provided, batch-
certified, 1-liter, stainless steel summa cannister to the sample tubing. The cannister will be equipped with
a choke that assures that the sample will be collected at a flow rate of less than 200 ml/min. Summa
cannister 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, and by the
laboratory upon their receipt to assure that the sample is not compromised by incursion of ambient
atmospheric gas. Once complete, the closed cannisters will be entered into chain of custody, and shipped
to a reputable and National Environmental Laboratory Accreditation Program (NELAP)-certified laboratory
to analyze for VOCs in gas by EPA Method TO-15. Further analytical discussion is provided in Section 4
below.

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 11

4.0 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:
• Soils, whether grabs or composites, will be analyzed RCRA metals via EPA Method 6020, with the
exception of mercury, which will be analyzed via EPA Method 7424; hexavalent chromium by EPA
Method 7199; VOCs using EPA Method 5035B for preparation and EPA Method 8260B for analysis;
and SVOCs via EPA Method 8270D.
Partner will collect sufficient aliquots for analysis of soil metals via applicable EPA Methods using
the Toxicity Characteristic Leaching Procedure (TCLP) preparation, if findings of metals above 20
times the hazardous waste threshold limit value occur for the FC-series samples that will be used
for environmental management. In this case the extraction will begin prior to the holding time
expiration.
• Groundwater will be analyzed for RCRA metals by EPA Method 6020, with the exception of mercury,
which will be analyzed by EPA Method 7424; hexavalent chromium by EPA Method 7199; VOCs by
EPA Method 8260B; and SVOCs by EPA Method 8270D.
• Soil gas samples will be analyzed for VOCs using EPA Method TO-15. The State of North Carolina
does not certify gas samples; however, the laboratory will have a NELAP certification.
No short holding time limits or other conditions that could adversely affect the analytical 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. Prior assessment has been
conducted that found very limited soil gas impact, hence analysis of eight soil vapor samples from four
samples near the previous impact detection will be the extent of soil vapor assessment. Likewise,
groundwater impact encountered in previous assessment has been found only for metals in locations
associated with the former Dynatech operation. Permanent monitor wells for the Brownfields Assessment
are focused on that area, for the standard Brownfields Assessment suite including RCRA metals, hexavalent
chromium, VOCs and SVOCs. Analytical reporting limits will be specified to match screening or regulatory
criteria for applicable NCDEQ programs, 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 3, 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.
Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 12

5.0 QUALITY ASSURANCE/QUALITY CONTROL
Partner will conduct QA/QC using industry standard methods and regulatory/guidance-specified means
indicated in Section 3 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. Certain QA/QC
intrinsic to the Scope, Methodology and Laboratory are discussed above.
To match Brownfields Program requirements, Partner will also perform one duplicate sample for every 20
samples collected, per media and per method, or at least on a daily basis per media and per method if less
than 20 samples are collected in a day. Trip blanks will be sent with each cooler and analyzed for VOCs upon
return to the laboratory, and sample volume will be sufficient for the laboratory performance of matrix spike
and matrix spike duplicates to assure no media interference effects on the analyses. The laboratory also at
a minimum will perform method blank analyses as a qualifier to spot instrument carryover if an analytical
batch includes a heavily contaminated sample. The laboratory will perform other QA/QC testing to meet
Level II QA/QC. The data will be evaluated by qualified professionals to assure industry standard and
regulatory/guidelines-specified usability for the Brownfields Assessment prior to reporting.
Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 13

6.0 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. In particular, IDW from monitor well borings and soil borings B-7, B-8, and B-9 will
be collected in 55-gallon drums due to potential impact with plating waste. Purge and development water
from the monitor wells will also be collected in a 55-gallon drum. 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,
and the water will be disposed near the monitor wells.

Brownfields Assessment Work Plan Partner Project Number: 21-307620
Dynatech II Brownfields Property Brownfields Project Number 25001-21-060
Charlotte, North Carolina June 8, 2021
Page 14

7.0 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 DEQ 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 a table documenting the data gathered during the
field activities, analytical per sampled and analyzed media, and comparison to applicable screening or
regulatory levels. Groundwater elevation data will be evaluated to produce a potentiometric map of
apparent groundwater flow. 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.

TABLE
Sample Locations Sample Type Sample Objectives Sample Depth Intervals Number of
Samples Analysis
B-5 through B-10 Soil - Grab Plating Waste & 2320
Toomey Avenue Assessments
Field Determination (0 to 20
ft bgs; one boring will have
two depth intervals)
6 RCRA Metals, Cr+6, VOCs, SVOCs
MW-1 through MW-4 Groundwater Plating Waste & 2320
Toomey Avenue Assessments
5 to 20 ft bgs, depending on
groundwater depth 4 RCRA Metals, Cr+6, VOCs, SVOCs
MSG-15, MSG-16, MSG-17. MSG-19 Soil Gas Vapor Intrusion Risk
Evaluation 5 and 10 ft bgs 8 VOCs via EPA Method TO-15
FC-1 through FC-32
Soil (Composite and
Grab from groupings of
3 to 5 borings each)
Environmental Management
Planning
Varies depending on grading
cut and debris fill removal
requirements
14 RCRA Metals, Cr+6, & SVOCs from
Composite; VOCs as Grab
Duplicate - Field Determination Soil QA/QC TBD - Same as Duplicate
Interval 4 RCRA Metals, Cr+6, VOCs, SVOCs
Duplicate - Field Determination Groundwater QA/QC TBD 1 RCRA Metals, Cr+6, VOCs, SVOCs
Duplicate - Field Determination Soil Gas QA/QC TBD - Same as Duplicate
Interval 1 VOCs via EPA Method TO-15
Trip Blanks Water QA/QC N/A - Per Cooler 5 VOCS
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
MSG = Methane Soil Gas boring being installed as part of Methane Assessment with dual use for VOC soil gas assessment
FC = Debris Fill and Grading Plan Cut Borings
FC Boring Groups will be determined in the field, with eight groupings currently expected and up to six groupings with two depth intervals for up to 14 sample sets
Table 1
Proposed Sample Summary
Brownfields Assessment Work Plan
Dynatech II Brownfields Project
Charlotte, North Carolina
Partner Project Number 21-370620 / Brownfields Project Number 25001-21-060

FIGURES
Dynatech II Brownfields
Project Properties
Charlotte, North Carolina 28217
8720 Red Oak Boulevard, Suite 528
www.partneresi.com
Fax.: [phone]
Tel.: [phone]
Date Project No.
Reference Dwg.
Project:
PM Drafter
Sketch No.Designer Checked By
Title:
Dynatech II Brownfields Project (25001-21-060)
Toomey Avenue and West Tremont Avenue
Figure 1
Site Location Map
21-3706204.16.21
DH AD F1
AD DH 1
Charlotte, North Carolina
Brownfields Assessment Work Plan
EXPLANATION
Reference: USGS 7.5 Minute Map, Charlotte East (Site)
& Charlotte West (West Adjacent Map), North
Carolina. Dated 2019. Contour Interval 10 Feet.
Parcel Boundaries
INTERSTATE 77W TREMONT AVENUEMVSG-1/1AAVENUEVILLAGE COURTParcel ID 119064242207 Toomey AvenueFormer Dynatech Parcel(Current Configuration)Parcel ID 119064282213 Toomey AvenueParcel ID 11906417728 W Tremont AvenueParcel ID 119064292301 Toomey AvenueParcel ID 119064262325 Toomey AvenueParcel ID 11906420704 W Tremont AvenuePlanned PropertyRecombination2213 Toomey AvenueMVSG-3/3AMSG-7MSG-9Parcel ID 119046262320 Toomey AvenueB-6/MW-2B-8/MW-4B-7/MW-3B-10B-9FC-9FC-1FC-10FC-2FC-3FC-5FC-6FC-12FC-11FC-7FC-8FC-13FC-15FC-16FC-14FC-20FC-21FC-22FC-24FC-23FC-19FC-25FC-4FC-18FC-26FC-17FC-27FC-28FC-29FC-30FC-31FC-32B-3**B-1**B-2**SG-2**SG-1**SG-3**MSG-4SG1SG2SG3MVSG-2/2AMVSG-6/6AMVSG-4/4AMVSG-5/5AB-2B-4MSG-3/3ATP-3TP-5TP-2MSG-19*MSG-15*MSG-16*MSG-17*MSG-12MSG-5MSG-6MSG-8MSG-13MSG-18MSG-14MSG-11MSG-20MVSG-7/7ATP-4TP-6TP-1MSG-21TOOMEY AVENUEB-3MSG-22MSG-10WOODCRESTMSG-2/2AMSG-1/1AB-1B-5/MW-1APPROXIMATE SCALE IN FEET028014070IMAGE SOURCE: NC ONEMAPTest PitNCharlotte, North Carolina 282178720 Red Oak Boulevard, Suite 528www.partneresi.comFax.: 704-353-7050Tel.: [phone]DateProject No.Reference Dwg.Project:PMDrafterSketch No.DesignerChecked ByTitle:Dynatech II Brownfields Project (25001-21-060)Toomey Avenue and West Tremont AvenueFigure 2Brownfields Assessment Work Plan21-3706206.7.21DHADF2ADDH2Charlotte, North CarolinaSite Plan with Assessment LocationsSoil Boring Fill withDebris DepthsB-1: 0 Ft BgsB-2: 0 Ft BgsB-3: 6 Ft BgsB-4: 3 Ft BgsPrevious Phase IIAssessment LocationsEXPLANATIONTest Pit Fill withDebris DepthsTP-1: ~8 Ft BgsTP-2: ~2 Ft BgsTP-3: ~2.5 Ft BgsTP-4: ~6.0 Ft BgsTP-5: ~4 Ft BgsTP-6: ~16 Ft BgsSoil Boring LocationDynatech II Brownfields Project ParcelsMethane SoilVapor SampleMethane and VOC SoilVapor SampleBrownfields AssessmentWork Plan LocationsSoil Gas Sample Location (VOCs)Soil Sample Location(Metals, VOCs, SVOCs)Soil and Groundwater SampleLocation(Metals, VOCs, SVOCs)Methane AssessmentLocationsSoil Gas Sample Location(Methane)Soil Gas Sample Location(Methane all nestedzones; VOCs for BFAssessment shallow zone[5'] only)Fill Characterization SampleSoil Gas SampleNotes:1.* - Indicates a methane soil gas (MSG) point that will also besampled during the Brownfields Assessment for VOC analysis.Numbering continues from prior MSG assessment.2.** - Soil borings B-1, B-2, and B-3 and soil gas samples SG-1, SG-2,and SG-3 located on 2320 Toomey Avenue installed as part ofseparate assessment than additional soil borings B-1, B-2, and B-3and soil gas samples SG1, SG2, SG3 which were installed as part ofPhase II Environmental Site Assessments on parcels southeast ofToomey Avenue.
B-1B-4B-3TP-4TP-3TP-5TP-6TP-2TP-1B-7/MW-2B-10FC-9FC-1FC-10FC-5FC-6FC-11FC-7FC-8FC-13FC-15FC-16FC-14FC-20FC-21FC-22FC-24FC-23FC-19FC-25FC-4FC-18FC-26FC-17FC-27FC-28FC-30FC-31FC-32B-2B-8/MW-3B-9FC-2FC-3FC-12FC-29APPROXIMATE SCALE IN FEET028014070IMAGE SOURCE: NC ONEMAPTest PitNCharlotte, North Carolina 282178720 Red Oak Boulevard, Suite 528www.partneresi.comFax.: 704-353-7050Tel.: [phone]DateProject No.Reference Dwg.Project:PMDrafterSketch No.DesignerChecked ByTitle:Dynatech II Brownfields Project (25001-21-060)Toomey Avenue and West Tremont AvenueFigure 3Brownfields Assessment Work Plan21-3706205.11.21DHADF3ADDH3Charlotte, North CarolinaFill Characterization InformationSoil Boring Fill withDebris DepthsB-1: 0 Ft BgsB-2: 0 Ft BgsB-3: 6 Ft BgsB-4: 3 Ft BgsPrevious Phase IIAssessment LocationsEXPLANATIONTest Pit Fill withDebris DepthsTP-1: ~8 Ft BgsTP-2: ~2 Ft BgsTP-3: ~2.5 Ft BgsTP-4: ~6.0 Ft BgsTP-5: ~4 Ft BgsTP-6: ~16 Ft BgsSoil Boring LocationDynatech II Brownfields Project ParcelsBrownfields AssessmentWork Plan LocationsSoil Sample Location(Metals, VOCs, SVOCs)Soil and Groundwater SampleLocation(Metals, VOCs, SVOCs)Fill Characterization SampleRoughly Estimated Extentof Fill Containing Debris

APPENDIX A: ANALYTICAL SUMMARY TABLES FROM PRIOR
REPORTS

TABLES - Phase II Subsurface Investigation - December 17, 2020
Table 1: Summary of Investigation Scope
2320 Toomey Avenue
Charlotte, North Carolina 28203
Partner Project Number 20-295196.2
December 1-3, 2020
Boring
Identification RECS/Issues Location
Terminal
Depth
(feet bgs)
Matrix
Sampled
Sampling
Depths
(feet bgs)
Target
Contaminants
Soil 8
Groundwater¹10.71
Soil 8
Groundwater¹10.73
Soil 8
Groundwater¹18.35
Notes:
bgs = below ground surface
PAHs = Polycyclic Aromatic Hydrocarbons
RCRA = Resource Conservation and Recovery Act
VOCs = Volatile Organic Compounds
¹ = Groundwater samples additionally analyzed for dissolved hexavalent chromium
VOCs
SG-1
Off-site northeast-
adjacent Gas-Fired
Products, Inc. (2250
Toomey Avenue) facility
Exterior north side of on-site building
within asphalt-paved access drive
area
5 Soil Gas
Exterior northeast side of on-site
building within asphalt-paved parking
lot area
VOCs, PAHs, RCRA
Metals
Off-site east-adjacent
RG Automation (2213
Toomey Avenue) facility
Exterior northeast side of on-site
building within asphalt-paved parking
lot area
5 Soil Gas 4
4 VOCsSG-3
Off-site west-adjacent
vacant commercial
facility (920 West
Tremont Avenue)
Exterior northwest side of on-site
building within gravel-paved parking
lot area
5 Soil Gas
VOCs, PAHs, RCRA
Metals
VOCs, PAHs, RCRA
MetalsB-1
Exterior north side of on-site building
within asphalt-paved access drive
area
16
Off-site northeast-
adjacent Gas-Fired
Products, Inc. (2250
Toomey Avenue) facility
Off-site east-adjacent
RG Automation (2213
Toomey Avenue) facility
B-2 18
B-3
Off-site west-adjacent
vacant commercial
facility (920 West
Tremont Avenue)
Exterior northwest side of on-site
building within gravel-paved parking
lot area
20
4 VOCs
SG-2
Table 2: Summary of Soil Sample Analytical Results
2320 Toomey Avenue
Charlotte, North Carolina 28203
Partner Project Number 20-295196.2
December 1-3, 2020
Chemical of Concern
NCDEQ
Residential
PSRGs
NCDEQ
Industrial /
Commercial
PSRGs
Protection of
Groundwater
PSRGs
Regional
Background
Concentrations*
B-1(8') B-2(8') B-3(8')
VOCs Various Various Various Various <MDL <MDL <MDL
Acenaphthylene NE NE NE NA <0.58 <0.58 0.0011 J
Anthracene 3,600 45,000 1,300 NA <0.53 <0.53 0.00074 J
Benzo(a)anthracene 1.1 21.0 0.35 NA <0.94 <0.94 0.0035 J
Benzo(a)pyrene 0.11 2.1 0.21 NA <0.64 <0.64 0.0032 J
Benzo(b)fluoranthene 1.1 21.0 1.2 NA <0.92 <0.92 0.0056 J
Benzo(g,h,i)perylene NE NE NE NA <1.4 <1.4 0.0028 J
Benzo(k)fluoranthene 11.0 210 12.0 NA <0.52 <0.52 0.0024 J
Chrysene 110 2,100 36.0 NA <0.63 <0.63 0.0039 J
Flouranthene 480 6,000 670 NA <1.6 <1.6 0.0064 J
Indeno(1,2,3-cd)pyrene 1.1 21.0 3.9 NA <1.1 <1.1 0.0023 J
2-Methylnaphthalene 48.0 600 3.1 NA <0.79 <0.79 0.00081 J
Phenanthrene NE NE NE NA <1.4 <1.4 0.0028 J
Pyrene 360 4,500 440 NA <1.3 <1.3 0.0067 J
Other PAHs Various Various Various Various <MDL <MDL <MDL
Arsenic 0.68 3.0 5.8 0.1 - 73.0 2.7 4.4 3.6
Barium 3,100 47,000 580 10 - 1,500 94.5 453 154
Cadmium 14.0 200 3.0 NE <0.12 0.17 0.061 J
Chromium (Total)0.31 6.5 NE 1.0 - 1,000 52.7 22.1 113
Lead 400 800 NE <10 - 300 6.9 11.9 4.7
Selenium 78.0 1,200 2.1 <0.1 - 3.9 2.1 2.6 2.7
Silver 78.0 1,200 3.4 NE 0.29 J 0.31 J 0.31 J
Mercury 2.3 9.7 1.0 0.01 - 3.4 0.032 0.019 0.012
Notes:
NA = Not Applicable
NCDEQ = North Carolina Department of Environmental Quality
NE = Not Established
PAHs = Polycyclic Aromatic Hydrocarbons
PSRGs = Preliminary Soil Remediation Goals
RCRA = Resource Conservation and Recovery Act
VOCs = Volatile Organic Compounds
mg/kg = micrograms per kilogram
<MDL = not detected above the laboratory method detection limit (MDL)
J = estimated concentration detected below the MDL and above the laboratory reporting limit (RL)
* Regional Background Concentrations published in Element Concentrations in Soils and Other Surficial Materials of the Conterminous
United States (Shacklette, et al., 1971)
Values highlighted and bolded where exceedances of regulatory standards
VOCs via 8260D (mg/kg)
PAHs via 8270E (mg/kg)
RCRA Metals via 6010/7471 (mg/kg)
Table 3: Summary of Groundwater Sample Analytical Results
2320 Toomey Avenue
Charlotte, North Carolina 28203
Partner Project Number 20-295196.2
December 1-3, 2020
Chemical of Concern 2L Standard GCLs
Non-Residential
GWSLs (TCR=1E-
06 or THQ=0.2)
B-1GW B-2GW B-3GW
Acetone 6,000 60,000,000 19,000,000 679 <6.2 57.2
2-Butanone 4,000 4,000,000 1,900,000 <3.3 <3.3 6.1
Benzene 1 5,000 69 <0.15 <0.15 <0.15
Ethylbenzene 600 84,500 150 0.82 J <0.26 <0.26
2-Hexanone 40 40,000 6,900 1.9 J <0.57 <0.57
Toluene 70 70,000 16,000 7.5 <0.24 0.26 J
Xylenes (total)500 85,500 320 4.9 J <0.63 <0.63
Other VOCs Various Various Various <MDL <MDL <MDL
Acenaphthene 80 1,950 NE 0.30 J <0.0084 0.017 J
Fluoranthene 300 300 NE <0.015 0.037 J <0.015
Fluorene 300 845 NE <0.012 0.020 J <0.012
1-Methylnaphthalene 1.0 1,000 NE 0.013 J 0.017 J 0.023 J
2-Methylnaphthalene 30 12,000 NE 0.030 J 0.029 J 0.052 J
Naphthalene 6.0 6,000 20 0.051 J 0.051 J 0.30 J
Phenanthrene 200 550 NE <0.030 0.082 J <0.030
Other PAHs Various Various Various <MDL <MDL <MDL
Barium 700 700,000 NE 92.0 420 17.7
Cadmium NE NE NE <0.40 0.48 J <0.40
Chromium (Total)10 10,000 NE 4.6 J 23.1 <3.7
Lead 15 15,000 NE 5.5 17.3 <4.5
Other Metals Various Various Various <MDL <MDL <MDL
Barium 700 700,000 NE 56.5 87.4 17.4
Cadmium NE NE NE <0.40 0.40 J 1.4
Chromium (Total)10 10,000 NE <3.7 12.9 <3.7
Other Metals Various Various Various <MDL <MDL <MDL
Hexavalent Chromium NE NE NE <6.0 12.5 <6.0
Notes:
2L = 15A NCAC 2L Groundwater Standards
GCLs = Gross Contaminant Levels
GWSLs = Groundwater Screening Levels
NE = Not Established
VOCs = Volatile Organic Compounds
µg/L = micrograms per liter
<MDL = not detected above the laboratory method detection limit (MDL)
J = estimated concentration detected below the MDL and above the laboratory reporting limit (RL)
Values highlighted and bolded where exceedances of regulatory standards
VOCs via 8260D (µg/l)
PAHs via 8270E (µg/l)
Dissolved RCRA Metals via 6010D (µg/l)
Dissolved Hexavalent Chromium via 7196A (mg/kg)
RCRA Metals via 6010D (µg/l)
Table 4: Summary of Soil Gas Sample Analytical Results
2320 Toomey Avenue
Charlotte, North Carolina 28203
Partner Project Number 20-295196.2
December 1-3, 2020
NCDEQ Residential Sub-
Slab and Exterior SGSLs
(TCR=1E-06 or THQ=0.2)
NCDEQ Non-Residential
Sub-Slab and Exterior
SGSLs
(TCR=1E-06 or THQ=0.2)
Propylene 482 360 83.8 21,000 260,000
Dichlorodifluoromethane 2.05 1.96 1.88 700 8,800
Chloromethane 4.61 1.68 1.32 630 7,900
Vinyl Chloride 0.544 <0.511 <0.511 5.6 280
1,3-Butadiene 83.6 19.4 7.08 3.1 41.0
Chloroethane 0.625 <0.528 <0.528 70,000 880,000
Ethyl Alcohol 56.9 19.2 <9.42 NE NE
Acetone 16.5 5.99 29.7 220,000 2,700,000
Trichlorofluoromethane <1.12 1.21 <1.12 NE NE
Iso-propyl Alcohol 10.3 2.56 <1.23 1,400 18,000
Carbon Disulfide 37.1 6.91 4.86 4,900 61,000
2-Butanone 13.0 12.5 10.6 35,000 440,000
Ethyl Acetate 8.79 21.9 <1.80 490 6,100
Tetrahydrofuran 5.66 5.04 <1.47 14,000 180,000
n-Hexane 160 36.7 10.2 4,900 61,000
Benzene 39.0 10.3 6.39 120 160
Cyclohexane 6.4 4.03 2.35 NE NE
Xylenes (Total)60.8 67.8 53.0 700 8,800
1,4-Dioxane 0.840 <0.721 <0.721 19.0 250
2,2,4-Trimethylpentane 5.23 8.36 4.76 NE NE
Heptane 23.5 11.5 5.49 2,800 35,000
4-Methyl-2-Pentanone 15.4 19.2 17.3 21,000 260,000
Toluene 130 65.2 46.7 35,000 440,000
2-Hexanone 21.6 23.8 25.9 210 2,600
Tetrachloroethene <1.36 1.45 1.55 280 3,500
Ethylbenzene 14.3 13.3 10.3 37.0 490
Styrene 4.16 1.41 <0.852 7,000 88,000
4-Ethyltoluene 3.87 6.49 5.56 NE NE
1,3,5-Trimethylbenzene 3.45 6.15 5.70 420 5,300
1,2,4-Trimethylbenzene 14.5 26.3 24.4 420 5,300
Naphthalene <1.05 <1.05 1.67 2.8 36.0
Notes:
NCDEQ = North Carolina Department of Environmental Quality
NC = Not Calculated
NE = Not Established
SGSLs = Soil Gas Screening Levels (dated July 2020)
TCR = Target Cancer Risk
THQ = Target Hazardous Quotient
VISLs = Vapor Intrusion Screening Levels
VOCs = Volatile Organic Compounds
µg/m3 = micrograms per cubic meter
< = not detected above indicated laboratory reporting limit (RL)
Values highlighted andbolded where exceedances of initial screening NCDEQ Residential Sub-Slab and Exterior SGSLs. Subject to secondary screening
using the NCDEQ Risk Calculator (July 2020 version)
VOCs via TO-15 (µg/m 3 )
Initial Screening Tier
SG-3SG-1Analyte SG-2

TABLES - Phase II Subsurface Investigation - January 29, 2021
Table 1: Summary of Investigation Scope
Toomey Avenue Multifamily Project
2207, 2301, 2315 Toomey Ave / 704 West Tremont Ave
Charlotte, North Carolina 28203
Partner Project Number 20-296889.3
January 13-14, 2021
Boring
Identification RECS/Issues Location
Terminal
Depth
(feet bgs)
Matrix
Sampled
Sampling
Depths
(feet bgs)
Target
Contaminants
Soil 4
Groundwater¹16.95
Soil 10
Groundwater¹24.15
Soil 10
Groundwater¹13.95
Soil 4
Groundwater¹5.33
Notes:
bgs = below ground surface
RCRA = Resource Conservation and Recovery Act
SVOCs = Semi-Volatile Organic Compounds
VOCs = Volatile Organic Compounds
* = Encountered probe refusal
Methane
MSG-1 704 West Tremont
Avenue parcel
Exterior northeast portion of the 704
Tremont Avenue parcel within
proposed building footprint
8 Soil Gas
Exterior northeast portion of 2207
Toomey Avenue parcel within a
grassed area
Methane
2207 Toomey Avenue
parcel
Exterior southwest portion of 2207
Toomey Avenue parcel within a
grassed area
5 Soil Gas 5
Soil Gas 5
5 VOCsMVSG-7 2207 Toomey Avenue
parcel
Northern portion of the 2207 Toomey
Avenue parcel within a grassed area 5 Soil Gas
VOCs
VOCs, SVOCs, RCRA
8 Metals,
Hexavalent
Chromium
B-1 704 West Tremont Avenue parcel
within proposed building footprint 24*
Proposed Building
Footprint (704 West
Tremont Avenue)
2207 Toomey Avenue
parcelMSG-2 5
MVSG-2 704 West Tremont
Avenue parcel
Exterior south side of existing on-site
704 West Tremont Avenue building
within a gravel-paved parking lot area
5
5 Methane
MSG-3
B-2 Former septic system
(2301 Toomey Avenue)
2301 Toomey Avenue parcel in an
assumed hydrologically down-
gradient area in relation to the former
on-site septic system
30*
VOCs, SVOCs, RCRA
8 Metals,
Hexavalent
Chromium
B-3 AST/Drum Storage Area
(2207 Toomey Avenue)
2207 Toomey Avenue parcel in
vicinity of former AST /drum storage
areas
22*
VOCs, SVOCs, RCRA
8 Metals,
Hexavalent
Chromium
B-4 AST/Drum Storage Area
(2207 Toomey Avenue)
2207 Toomey Avenue parcel in
vicinity of former AST /drum storage areas 10*
VOCs, SVOCs, RCRA
8 Metals,
Hexavalent
Chromium
5 VOCs
Soil Gas 5
MVSG-3 2315 Toomey Avenue
parcel
Exterior northeast side of the existing
on-site building within a grassed area 5 Soil Gas 5 VOCs
MVSG-1 704 West Tremont Avenue parcel
Exterior northeast side of existing on-
site 704 West Tremont Avenue
building within a grassed area
5 Soil Gas
5 VOCs
MVSG-5 2207 Toomey Avenue
parcel
Western portion of 2207 Toomey Avenue parcel comprising subject
property within a grassed area
5 Soil Gas 5 VOCs
MVSG-4 2301 Toomey Avenue
parcel
Central portion of 2301 Toomey
Avenue parcel in an assumed
hydrologically down-gradient area in
relation to the former on-site septic
system
5 Soil Gas
5 VOCsMVSG-6 2207 Toomey Avenue
parcel
Northwest portion of 2207 Toomey
Avenue parcel within a grassed area 5 Soil Gas
Table 2: Summary of Soil Sample Analytical Results
Toomey Avenue Multifamily Project
2207, 2301, 2315 Toomey Ave / 704 West Tremont Ave
Charlotte, North Carolina 28203
Partner Project Number 20-296889.3
January 13-14, 2021
Chemical of Concern
NCDEQ
Residential
PSRGs
NCDEQ
Industrial /
Commercial
PSRGs
Protection of
Groundwater
PSRGs
Regional
Background
Concentrations*
B-1(4')B-2(10')B-3(10')B-4(4')
Acetone 12,000 140,000 25.0 NA 0.10 J <0.046 <0.030 <0.030
Ethylbenzene 6.1 27.0 13.0 NA 0.0068 J <0.0033 <0.0022 <0.0022
Naphthalene 2.1 8.8 0.39 NA 0.028 <0.0037 <0.0024 <0.0025
Toluene 990 9,700 8.3 NA 0.014 <0.0020 <0.0013 <0.0013
1,2,4-Trimethylbenzene 63.0 370 12.0 NA 0.020 <0.0019 <0.0013 <0.0013
Xylenes (Total)120 530 9.9 NA 0.035 <0.0041 <0.0026 <0.0027
Other VOCs Various Various Various Various <MDL <MDL <MDL <MDL
Acenaphthene 720 9,000 16.0 NA <0.11 0.27 J <0.085 <0.087
Anthracene 3,600 45,000 1,300 NA <0.53 0.43 J <0.086 <0.087
Benzo(a)anthracene 1.1 21.0 0.35 NA <0.94 1.5 <0.11 <0.11
Benzo(a)pyrene 0.11 2.1 0.21 NA <0.64 1.2 <0.14 <0.15
Benzo(b)fluoranthene 1.1 21.0 1.2 NA <0.92 1.9 <0.13 <0.14
Benzo(g,h,i)perylene NE NE NE NA <1.4 0.71 <0.13 <0.13
Benzo(k)fluoranthene 11.0 210 12.0 NA <0.52 0.77 <0.14 <0.14
Chrysene 110 2,100 36.0 NA <0.63 1.6 <0.096 <0.098
Dibenz(a,h)anthracene 0.11 2.1 0.38 NA <0.16 0.21 J <0.13 <0.13
Flouranthene 480 6,000 670 NA <1.6 2.9 <0.10 <0.10
Fluorene 480 6,000 110 NA <0.11 0.18 J <0.089 <0.090
Indeno(1,2,3-cd)pyrene 1.1 21.0 3.9 NA <1.1 0.66 <0.15 <0.15
Phenanthrene NE NE NE NA <1.4 1.9 <0.083 <0.085
Pyrene 360 4,500 440 NA <1.3 2.5 <0.091 <0.093
Other PAHs Various Various Various Various <MDL <MDL <MDL <MDL
Arsenic 0.68 3.0 5.8 0.1 - 73.0 1.1 J 1.7 J <0.40 0.64 J
Barium 3,100 47,000 580 10 - 1,500 91.4 88.5 39.9 144
Cadmium 14.0 200 3.0 NE 0.085 J 0.062 J <0.040 0.049 J
Chromium (Total)0.31 6.5 NE 1.0 - 1,000 20.5 108 166 49.4
Lead 400 800 NE <10 - 300 12.3 22.4 1.6 5.7
Selenium 78.0 1,200 2.1 <0.1 - 3.9 <0.48 0.74 J 0.47 J <0.37
Silver 78.0 1,200 3.4 NE <0.24 0.21 J <0.20 0.21 J
Mercury 2.3 9.7 1.0 0.01 - 3.4 0.066 0.059 0.0053 0.0088
Chromium, Hexavalent 0.31 6.5 3.8 NE <6.8 <6.2 <5.1 <5.0
Notes:
NA = Not Applicable
NCDEQ = North Carolina Department of Environmental Quality
NE = Not Established
PSRGs = Preliminary Soil Remediation Goals
RCRA = Resource Conservation and Recovery Act
SVOCs = Semi-Volatile Organics
VOCs = Volatile Organic Compounds
mg/kg = micrograms per kilogram
<MDL = not detected above the laboratory method detection limit (MDL)
J = estimated concentration detected below the MDL and above the laboratory reporting limit (RL)
* Regional Background Concentrations published in Element Concentrations in Soils and Other Surficial Materials of the Conterminous
United States (Shacklette, et al., 1971)
Values highlighted and bolded where exceedances of regulatory standards
VOCs via 8260D (mg/kg)
SVOCs via 8270E (mg/kg)
RCRA Metals via 6010/7471 (mg/kg)
Hexavalent Chromium via 7196A (mg/kg)
Table 3: Summary of Groundwater Sample Analytical Results
Toomey Avenue Multifamily Project
2207, 2301, 2315 Toomey Ave / 704 West Tremont Ave
Charlotte, North Carolina 28203
Partner Project Number 20-296889.3
January 13-14, 2021
Chemical of Concern 2L Standard GCLs
Residential
GWSLs (TCR=1E-
06 or THQ=0.2)
B-1GW B-2GW B-3GW B-4GW
Acetone 6,000 60,000,000 19,000,000 36.5 <6.2 <6.2 <6.2
2-Hexanone 40 40,000 6,900 0.72 J <0.57 <0.57 <0.57
Toluene 70 70,000 16,000 <0.24 0.28 J <0.24 <0.24
Other VOCs Various Various Various <MDL <MDL <MDL <MDL
Benzyl Alcohol 700 700,000 NE 7.2 J <2.9 <3.4 <2.9
Fluoranthene 300 300 NE <2.2 3.3 J <2.2 <2.2
Pyrene 200 200 NE <2.2 2.7 J <2.2 <2.2
Other PAHs Various Various Various <MDL <MDL <MDL <MDL
Arsenic NE NE NE <4.7 <4.7 <4.7 8.0 J
Barium 700 700,000 NE 300 317 55.5 230
Chromium (Total)10 10,000 NE 7.2 18.3 4.2 J 38.2
Lead 15 15,000 NE 7.4 <4.5 <4.5 18.3
Other Metals Various Various Various <MDL <MDL <MDL <MDL
Hexavalent Chromium NE NE NE <6.0 <6.0 <6.0 <6.0
Notes:
2L = 15A NCAC 2L Groundwater Standards
GCLs = Gross Contaminant Levels
GWSLs = Groundwater Screening Levels
NE = Not Established
SVOCs = Semi-Volatile Organic Compounds
VOCs = Volatile Organic Compounds
µg/L = micrograms per liter
<MDL = not detected above the laboratory method detection limit (MDL)
J = estimated concentration detected below the MDL and above the laboratory reporting limit (RL)
Values highlighted and bolded where exceedances of regulatory standards
VOCs via 8260D (µg/l)
SVOCs via 8270E (µg/l)
Dissolved Hexavalent Chromium via 7196A (mg/kg)
RCRA Metals via 6010D (µg/l)
Table 4: Summary of Soil Gas Sample Analytical Results
Toomey Avenue Multifamily Project
2207, 2301, 2315 Toomey Ave / 704 West Tremont Ave
Charlotte, North Carolina 28203
Partner Project Number 20-296889.3
January 13-14, 2021
Propylene NA NA NA 238 293 236 164 957 <1.60 446 21,000 260,000
Dichlorodifluoromethane NA NA NA <0.678 <0.678 2.19 2.33 2.19 2.34 1.82 700 8,800
Chloromethane NA NA NA 0.469 1.45 1.92 3.37 8.45 98.7 0.653 630 7,900
Vinyl Chloride NA NA NA 0.394 J <0.243 0.458 J 0.849 1.83 10.8 <0.243 5.6 280
1,3-Butadiene NA NA NA <0.230 19.0 19.2 13.7 77.9 75.5 22.6 3.1 41.0
Chloroethane NA NA NA <0.263 <0.263 <0.263 <0.263 <0.263 29.5 <0.263 70,000 880,000
Acetone NA NA NA 55.6 34.5 17.1 23.0 26.9 903 21.1 220,000 2,700,000
Trichlorofluoromethane NA NA NA <0.460 <0.460 1.75 2.13 1.88 66.9 11.6 NE NE
Iso-propyl Alcohol NA NA NA <0.649 3.20 <0.649 2.11 J 2.17 J 38.3 1.04 J 1,400 18,000
Carbon Disulfide NA NA NA 21.4 6.47 5.14 4.36 7.87 73.1 14.0 4,900 61,000
Carbon Tetrachloride NA NA NA <0.641 0.569 J 0.502 J 0.800 J 0.539 J <0.641 <0.641 16.0 200
2-Butanone NA NA NA 20.1 13.4 5.10 9.85 13.4 1,030 6.22 35,000 440,000
n-Hexane NA NA NA 101 12.7 22.9 31.7 31.6 159 15.5 4,900 61,000
Benzene NA NA NA 7.41 7.57 9.33 14.0 18.8 189 4.57 120 160
Cyclohexane NA NA NA 47.2 2.53 2.71 4.44 <0.259 27.9 1.77 NE NE
cis-1,2-Dichloroethene NA NA NA 0.828 <0.311 <0.311 <0.311 <0.311 <0.311 <0.311 NE NE
Ethanol NA NA NA 15.3 <0.500 13.8 12.7 56.0 20.6 12.05 NE NEXylenes (Total)NA NA NA 15.31 15.88 16.32 41.8 20.12 93.9 10.85 700 8,800
1,4-Dioxane NA NA NA <0.300 0.352 J <0.300 0.407 J <0.300 <0.300 <0.300 19.0 250
1,1,2-Trichlorotrifluoroethane NA NA NA <0.608 0.701 J 0.651 J 0.843 J 0.812 J <0.608 <0.608 NE NE
2,2,4-Trimethylpentane NA NA NA 12.7 2.91 4.86 7.57 4.26 42.4 3.06 NE NE
Heptane NA NA NA 56.0 4.29 9.61 12.5 12.2 58.9 7.28 2,800 35,000
4-Methyl-2-Pentanone NA NA NA 1.27 J 2.03 J 1.46 J 3.43 J 12.3 21.5 5.04 J 21,000 260,000
Methylene Chloride NA NA NA <0.340 <0.340 <0.340 1.08 <0.340 <0.340 <0.340 3,400 53,000
Methyl Methacrylate NA NA NA <0.359 <0.359 1.69 <0.359 20.5 40.4 1.29 4,900 61,000
Toluene NA NA NA 22.8 26.1 26.7 37.7 34.8 71.6 12.0 35,000 440,000
2-Hexanone NA NA NA <0.544 <0.544 2.93 J 10.1 3.10 J <0.544 <0.544 210 2,600
Tetrachloroethene NA NA NA <0.553 <0.553 0.571 J 0.643 J 0.678 J 1.35 J <0.553 280 3,500
Ethylbenzene NA NA NA 7.80 3.60 <0.362 8.67 5.38 37.6 2.40 37.0 490
Styrene NA NA NA 1.64 2.08 2.14 <0.335 3.96 <0.335 1.52 7,000 88,000
4-Ethyltoluene NA NA NA 3.32 3.96 <0.384 <0.384 5.35 24.7 3.94 NE NE
1,2-Dichlorotetrafluoroethane NA NA NA 3.99 <0.622 <0.622 <0.622 <0.622 <0.622 <0.622 NE NE
1,3,5-Trimethylbenzene NA NA NA 1.56 1.31 1.44 2.86 1.72 9.62 1.60 420 5,300
1,2,4-Trimethylbenzene NA NA NA 4.59 5.15 5.50 25.1 6.53 15.5 5.06 420 5,300
Notes:
NCDEQ = North Carolina Department of Environmental Quality
NA = Not Analyzed
NC = Not Calculated
NE = Not Established
SGSLs = Soil Gas Screening Levels (dated July 2020)
TCR = Target Cancer Risk
THQ = Target Hazardous Quotient
VISLs = Vapor Intrusion Screening Levels
VOCs = Volatile Organic Compounds
µg/m3 = micrograms per cubic meter
%bv = Percent by volume
< = not detected above indicated laboratory reporting limit (RL)
Values highlighted and bolded where exceedances of initial screening NCDEQ Residential Sub-Slab and Exterior SGSLs. Subject to secondary screening
using the NCDEQ Risk Calculator (July 2020 version)
VOCs via TO-15 (µg/m3)
MSG-3MSG-1Analyte MSG-2 MVSG-1 MVSG-2 MVSG-3 MVSG-4 MVSG-5 MVSG-6 MVSG-7
NCDEQ Residential Sub-
Slab and Exterior SGSLs
(TCR=1E-06 or THQ=0.2)
NCDEQ Non-Residential
Sub-Slab and Exterior
SGSLs
(TCR=1E-06 or THQ=0.2)

TABLES - Methane Assessment Work Plan - April 23, 2021
Table 1A
Summary of Methane Soil Gas Results
Multifamily Parcels
Dynatech II Brownfields Project
Charlotte, North Carolina 28203
Partner Project Number 21-370620
Brownfields Project Number 25001-21-060
January 13 and 14, 2021
Methane NA NA NA NA NA NA NA NA NA NA 1.25
Methane 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.25
Static Pressure 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 N/A
Differential Pressure -0.021 -0.025 -0.020 -0.023 -0.023 -0.027 -0.027 -0.026 -0.035 -0.030 N/A
Notes:
NCDEQ = North Carolina Department of Environmental Quality
%bv = Percent by volume
< = not detected above indicated laboratory reporting limit (RL)
NA = Not analyzed
N/A = Not applicable
Methane via TO-15 (%bv)
Methane via LandTec Gem 2000 Field Instrument (%bv)
Pressure via LandTec Gem 2000 Field Instrument (Inches of Water)
MVSG-3 MVSG-4 MSVG-5 MVSG-6 MVSG-7
NCDEQ Methane
Threshold Criteria for
Residential Re-Use
Analyte MSG-1 MSG-2 MSG-3 MSVG-1 MVSG-2
Table 1B
Summary of Methane Soil Gas Results
Multifamily Parcels
Dynatech II Brownfields Project
Charlotte, North Carolina 28203
Partner Project Number 21-370620
Brownfields Project Number 25001-21-060
February 2, 2021
Methane <0.0584 <0.0584 <0.0584 0.672 <0.0584 <0.0584 <0.0584 <0.0584 <0.0584 <0.0584 1.25
Methane 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.25
Static Pressure 0.1 0.1 0.1 0.1 0.1 0.0 0.1 0.0 0.1 7.8 N/A
Differential Pressure -0.050 -0.050 -0.400 -0.098 -0.050 -0.098 -0.050 -0.044 -0.045 0.000 N/A
Notes:
NCDEQ = North Carolina Department of Environmental Quality
%bv = Percent by volume
< = not detected above indicated laboratory reporting limit (RL)
N/A = Not applicable
Methane via LandTec Gem 2000 Field Instrument (%bv)
Pressure via LandTec Gem 2000 Field Instrument (Inches of Water)
Methane via TO-15 (%bv)
MVSG-3A MVSG-4A MSVG-5A MVSG-6A MVSG-7A
NCDEQ Methane
Threshold Criteria for
Residential Re-Use
Analyte MSG-1A MSG-2A MSG-3A MSVG-1A MVSG-2A
Table 2
Summary of Methane Soil Gas Results
Foremer Dynatech Parcel
Dynatech II Brownfields Project
Charlotte, North Carolina 28203
Partner Project Number 21-370620
Brownfields Project Number 25001-21-060
August 18, 2020
Methane <0.11 <0.12 <0.12 1.25
Methane 0.00 0.00 0.02 1.25
Notes:
NCDEQ = North Carolina Department of Environmental Quality
%bv = Percent by volume
< = not detected above indicated laboratory reporting limit (RL)
Static and differnetial pressures not available for this event
Methane via TO-15 (%bv)
Methane via LandTec Gem 2000 Field Instrument (%bv)
NCDEQ Methane
Threshold Criteria for
Residential Re-Use
Analyte SG 1 SG 2 SG 3
Sample Locations Sample Type Sample Objectives Sample Depth Intervals Number of
Samples Analysis
MSG-4, MSG-5, MSG-6, MSG-12, MSG-
14, MSG-15 Soil Gas Vapor Intrusion Risk
Evaluation Centered on 5 and 10 ft bgs 48 Methane, carbon dioxide, oxygen,
hydrogen sulfide (Field Meter)
MSG-7, MSG-8, MSG-9, MSG-10, MSG-
11, MSG-13, MSG-16, MSG-17, MSG-
18, MSG-19, MSG-20, MSG-21, MSG-
22
Soil Gas Vapor Intrusion Risk
Evaluation
Centered on 5 and 10 ft bgs
and from 15 to 20 ft bgs 156 Methane, carbon dioxide, oxygen,
hydrogen sulfide (Field Meter)
Notes:
ft bgs = feet below ground surface
Sample intervals at 5 and 10 ft bgs are 1 foot in thickness
Sample numbers include two samples/measurements for each single day event, with two single day events 48 hours apart (4 separate samples/measurements at each point).
Six nested locations have two points (6 x 2 x 4 = 56 samples), and 13 nested locations have three points (13 x 3 x 4 =156 samples).
Table 3
Proposed Sample Summary
Methane Assessment Work Plan
Multifamily Parcels - Dynatech II Brownfields Project
Charlotte, North Carolina
Partner Project Number 21-370620 / Brownfields Project Number 25001-21-060