09058_Midtown Mall_In_Situ Soil Temp Well_WP_20240411

April 11, 2024

Ms. Carolyn Minnich, Brownfields Project Manager
North Carolina Department of Environmental Quality
Division of Waste Management, Brownfield Redevelopment Section
Mail Service Center 1646
Raleigh, North Carolina 27699-1646

Subject: In-Situ Soil Characterization Work Plan – Revision 1
Midtown Square Mall
1200 Metropolitan Avenue
Charlotte, North Carolina
Brownfields Project #09058-05-060
Mid-Atlantic Project #H1824.00 – Task 50000

Dear Ms. Minnich:

On behalf of NR Met Property Owner LP (the Prospective Developer or PD) Mid-Atlantic
Associates, Inc. (Mid-Atlantic) has prepared this In-Situ Soil Characterization Work Plan
– Revision 1 (Work Plan) for a portion of the Midtown Square Mall Brownfields property
(Brownfields Project #09058-05-060) for your review, comment, and approval. The
Brownfields property is located at 1200 Metropolitan Avenue in Charlotte, Mecklenburg
County, North Carolina (subject site). The subject site consists of one (1) parcel of land
encompassing approximately 1.3 acres (Parcel #12522705).

1.0 INTRODUCTION

The subject site is comprised of one (1) approximate 1.3-acre parcel of land that is zoned
Mixed Use Development District (MUDD) and located 0.5 miles southeast of Uptown
Charlotte. The subject site does not have any permanent structures but is currently
utilized as green space adjacent to the Little Sugar Creek Greenway. The Midtown
Square Mall Brownfields property includes the subject site parcel, a north adjacent parcel
which is developed with three (3) mixed use structures collectively known as the
Metropolitan, and an east adjacent parcel developed as a parking lot for a commercial
strip mall. A site layout map is provided as Drawing 1.

In-Situ Soil Characterization Work Plan – Rev 1 April 11, 2024 Midtown Square Mall – Charlotte, NC Page 2
NCDEQ Brownfield Project #09058-05-060
Mid-Atlantic Project #H1824.00 – Task 50000

2.0 BACKGROUND

The PD has recently begun initial clearing activities ahead of the planned redevelopment
of the subject site. Redevelopment activities include the construction of a mixed-use
building including retail, residential and parking. The foundation for the new building has
ground-floor slab-on-grade at two levels. The lowest level will be utilized as a mechanical
floor which has a small footprint for building support facilities. The first floor includes a
larger footprint that includes lobby/amenities, retail, building operations facilities and
parking uses and incorporates podium construction for the parking garage. The parking
structure is on the first through fifth floors. The building’s sixth through twenty-seventh
floors are residential apartments.

Mid-Atlantic submitted an Environmental Management Plan (EMP) for the planned
redevelopment and received North Carolina Department of Environmental Quality
(NCDEQ) approval on November 30, 2023. As part of redevelopment activities, the PD
and their construction team plan on excavating portions of subject site soils at depths
ranging from 0 to 6 feet below ground surface (ft bgs) prior to advancing their continuous
flight auger (CFA) piles. The areas of excavation will be necessary to bring the CFA pile
areas to grade and install the necessary concrete footer caps. Based on the limited area
for stockpiling on the subject site, the PD will need to export excavated material prior to
mobilizing the deep foundation drilling equipment to the site. As such, it will be necessary
to sample this material in-situ prior to excavation activities. Additionally, the PD
anticipates encountering a large volume of groundwater during advancement of the CFA
piles. Per stipulations in the EMP, groundwater encountered during redevelopment
activities will be allowed to naturally dissipate back into the subsurface. However, the
large volume of groundwater may not be feasible and thus will require alternative storage
methods.

Based on discussions with the PD and Ms. Carolyn Minnich of the Brownfields
Redevelopment Section (BRS), Mid-Atlantic proposes to collect in-situ composite soil
samples in the vicinity of soils proposed for export following excavation activities. Mid-
Atlantic also proposes to advance up to three (3) piezometer borings to determine the
relative depth to water and hydrogeologic characteristics in areas where the CFA piles
will be advanced. The following Work Plan documents proposed assessment activities
ahead of redevelopment of the Brownfields property.

In-Situ Soil Characterization Work Plan – Rev 1 April 11, 2024 Midtown Square Mall – Charlotte, NC Page 3
NCDEQ Brownfield Project #09058-05-060
Mid-Atlantic Project #H1824.00 – Task 50000

3.0 SCOPE OF WORK

Soil and piezometer boring locations will be documented in the field using a hand-held
global position system (GPS) unit. Coordinates will be documented in the field notes and
transferred to site drawings for sampling location documentation and subsequent
reporting. The proposed assessment activities will be performed in general accordance
with the NCDEQ Inactive Hazardous Sites Branch (IHSB) Guidelines for Assessment and
Cleanup dated September 2023 and most recent versions of the USEPA Region IV
Science and Ecosystem Support Division (SESD) Field Branches Quality System and
Technical Procedures guidelines. Mid-Atlantic proposes to conduct the following
assessment activities at the Brownfields property:

• Five (5) composite soil samples (ES-1 through ES-5) will be collected in areas
proposed for excavation and off-site disposal during redevelopment activities.
• Three (3) piezometer borings will be advanced for the installation of 2” temporary
monitoring wells (TMW-1 through TMW-3) and hydrogeologic characterization.

The proposed sampling locations and deep foundation plan overlay are depicted on
Drawing 2. The proposed in-situ soil characterization assessment methodology is
described in the sections below.

3.1 Soil Sampling Methodology

Mid-Atlantic will mobilize to the subject site to collect soil samples in areas proposed for
excavation and off-site disposal during redevelopment activities. According to the most
recent site plan, the PD anticipates needing to excavate and export approximately 5,000
cubic yards of soil prior to deep foundation drilling activities for the multi-story residential
structure. As such, Mid-Atlantic proposes to collect up to five (5) composite soil samples
(ES-1 through ES-5). Each composite sample will include the advancement of a minimum
of four (4) aliquot soil borings and the homogenization samples collected from the aliquot
soil borings. The composite soil sampling area will encompass no more than 1,000 cubic
yards of material. Based on the PD’s estimated excavation depths, aliquot soil borings for
each composite soil sample will be advanced to a maximum depth of 6 ft bgs utilizing a
track-mounted Geoprobe® drill rig and direct-push technology (DPT) drilling methods.

Mid-Atlantic will collect two (2) soil samples from each screening interval (every 1 foot)
per aliquot sampling location: one (1) will be logged for lithological description and field
screened for indication of potential impacts by observation for staining, unusual odors,
In-Situ Soil Characterization Work Plan – Rev 1 April 11, 2024 Midtown Square Mall – Charlotte, NC Page 4
NCDEQ Brownfield Project #09058-05-060
Mid-Atlantic Project #H1824.00 – Task 50000

and the presence of organic vapors using a calibrated photoionization detector (PID) and
one (1) will be placed on ice. The additional aliquot soil samples placed on ice for each
screening interval will be collected in this manner to prevent volatilization (i.e., not
homogenized and not screened by the PID). Following field screening results, the
additional aliquot soil samples will be collected as discrete grab samples for laboratory
analysis of volatile organic compounds (VOCs) from the aliquot soil sample intervals
exhibiting the highest likelihood for impact (i.e., will not be collected from the
bag/container used to screen for PID readings). If no obvious evidence of impact is
observed in samples collected from aliquot soil borings, a randomly selected aliquot soil
sample interval will be collected in the composite soil sampling area. Following VOC
sample collection, the remaining soil volume from the non-volatilized bag will be combined
and homogenized in a decontaminated stainless-steel bowl to form one composite soil
sample for analysis of semi-VOCs (SVOCs) and Resource Conservation and Recovery
Act (RCRA) metals plus hexavalent chromium.

The composite soil samples will be collected into laboratory-supplied glassware and
placed on ice for delivery under chain-of-custody protocol within 24 hours of collection to
a North Carolina accredited laboratory. Composite soil samples collected will be analyzed
for VOCs by EPA Method 8260, SVOCs by EPA Method 8270, and RCRA metals plus
hexavalent chromium by EPA Methods 6020/7471/7199. A table summarizing composite
soil sampling details is provided in Table 1.

3.2 Groundwater Assessment Methodology

In addition to the in-situ soil characterization, Mid-Atlantic will advance three (3) three
piezometer soil borings past the water table for the installation of temporary monitoring
wells TMW-1 through TMW-3. Previous assessment activities have indicated that depth
to water ranges from approximately 15 to 20 ft bgs. As such, the temporary monitoring
wells will be advanced using a track-mounted Geoprobe® drill rig to depths up to
approximately 25 to 30 ft bgs via hollow-stem auger (HSA) drilling methods. The
temporary monitoring wells will be constructed of 2-inch polyvinyl chloride riser pipe and
up to 15 feet of 0.010-inch slotted well screen. A sand filter pack will be placed from the
bottom of the borings to approximately 2 feet above the top of the well screens. The wells
will then be completed by placing a minimum of 2 feet hydrated bentonite seal above the
sand filter pack.

Once the temporary monitoring wells are installed, the wells will be developed by purging
at least three (3) volumes of water from each. Following development, the temporary
In-Situ Soil Characterization Work Plan – Rev 1 April 11, 2024 Midtown Square Mall – Charlotte, NC Page 5
NCDEQ Brownfield Project #09058-05-060
Mid-Atlantic Project #H1824.00 – Task 50000

monitoring wells will be allowed to equilibrate to static conditions for a minimum of 24
hours and a decontaminated electronic water level indicator will be used to measure the
depth to the water table relative to the ground surface and to the top of the well casing in
each well. The elevation of the top of casing for each well will be surveyed relative to an
arbitrary datum. Using the depth to water and top of casing survey measurements, Mid-
Atlantic will calculate the elevation of groundwater at each well location and estimate
groundwater flow direction at the subject site.

Following water level measurements, Mid-Atlantic will collect groundwater samples from
the temporary monitoring wells utilizing low flow/low stress purging techniques with a
peristaltic pump and dedicated polyethylene tubing. The intake point of the pump tubing
will be placed in the approximate mid-portion of the screened interval of the well purged
at a rate no greater than 200 milliliters per minute (mL/min). Mid-Atlantic will utilize a water
quality meter to collect measurements of pH, temperature, dissolved oxygen, oxidation
reduction potential, turbidity, and specific conductivity at approximate five-minute
intervals during the purging process. Pre-sampling purging will be considered complete
when the field parameters stabilize (pH ± 0.1 SU, conductivity varies no more than 5%,
and turbidity is less than 10 Nephelometric Turbidity Units [NTUs]). Groundwater samples
will be collected directly into laboratory supplied sample containers using the “soda straw”
method to minimize the potential for volatile compound loss through the peristaltic pump
head. The groundwater samples will be collected into laboratory-supplied glassware and
placed on ice for delivery under chain-of-custody protocol within 24 hours of collection to
a North Carolina accredited laboratory. The groundwater samples collected will be
analyzed for VOCs by EPA Method 8260, SVOCs by EPA Method 8270, and RCRA
metals by EPA Methods 6020/7471. A table summarizing composite groundwater
sampling details is provided in Table 2.

In addition to collecting groundwater samples, Mid-Atlantic will conduct slug tests at each
temporary monitoring well using the “slug-out” methodology. The “slug-out” method will
be conducted by removing a volume of water from the well casing via dedicated
polyethylene bailer and measuring the recharge time. Slug test data will be collected
using a Solinst® Levelogger and associated software. Additional well construction and
water level data will be collected in the field notes for calculating hydraulic conductivity
for each well. Slug test results will be summarized in the final report.

In-Situ Soil Characterization Work Plan – Rev 1 April 11, 2024 Midtown Square Mall – Charlotte, NC Page 6
NCDEQ Brownfield Project #09058-05-060
Mid-Atlantic Project #H1824.00 – Task 50000

3.3 Quality Assurance and Quality Control

For quality assurance/quality control (QA/QC) purposes, Mid-Atlantic will collect one (1)
duplicate soil sample and one (1) duplicate groundwater sample which will be submitted
for the same laboratory analysis as the parent samples. Samples submitted for laboratory
analysis will include an adequate sample volume for laboratory matrix spike (MS) and
matrix spike duplicate (MSD) analysis. Nondedicated sampling equipment used for
collecting the samples will be decontaminated prior to use at each sampling location.
Laboratory QA/QC procedures will be employed to ensure appropriate sample handling
and analysis and to aid in the review and validation of the analytical data. Mid-Atlantic will
request that the laboratory include estimated concentrations for compounds that are
detected at levels above the laboratory method detection limit, but below the laboratory
reporting limit (J flags). The laboratory analytical data report and QA package for each
group of samples submitted to and analyzed by the subcontracted laboratory will be
provided in an appendix to the final report. Laboratory QA data consistent with Level II
documentation will be provided for this project.

3.4 Investigative Derived Waste

Investigative derived waste (IDW) generated during the proposed assessment activities
will be managed in general accordance with NCDEQ IHSB Guidelines for Assessment
and Cleanup and General Status (G.S.) 15A NCAC 02T.1503 and 15A NCAC 02H. 0106.
Following completion of the sampling activities, the soil borings will be properly
abandoned with bentonite chips and hydrated to close the borings. Purge water
generated during groundwater assessment activities will be containerized pending
laboratory analytical results. Final IDW management methodologies will be included in
the final report.

4.0 REPORTING

The in-situ soil characterization and hydrogeological assessment activities and results will
be documented in an In-Situ Soil Characterization Report for NCDEQ review and
approval prior to transporting any material off-site. The report will include a description of
the sampling activities, field notes, boring logs, figures depicting sampling locations and
results, laboratory analytical data, a discussion of the analytical results in comparison to
applicable regulatory screening levels, risk calculator results, and conclusions and
recommendations concerning subject site activities.
In-Situ Soil Characterization Work Plan – Rev 1 April 11, 2024 Midtown Square Mall – Charlotte, NC Page 7
NCDEQ Brownfield Project #09058-05-060
Mid-Atlantic Project #H1824.00 – Task 50000

Mid-Atlantic appreciates the opportunity to provide this Work Plan for consideration.
Please contact the undersigned if there are questions concerning our proposed approach.

With best regards,

MID-ATLANTIC ASSOCIATES, INC.

Greg D. Icenhour, P.G., MBA Shane Sisco, P.G.
Principal Geologist Project Hydrogeologist

Attachments: Work Plan Approval Signature Page

Table
Table 1 – Proposed Soil Sampling Matrix
Table 2 – Proposed Groundwater Sampling Matrix

Drawings
Drawing 1 – Site Map
Drawing 2 – Proposed Sample Location Map

Mid-Atlantic is authorized to practice engineering by the North Carolina Board of Examiners for Engineers
and Surveyors, License F-0967 and Geology under the North Carolina Board for Licensing of Geologists,
License C-186.

ATTACHMENT 1 DEQ Brownfields Redevelopment Section Assessment Work Plan Approval Signature Page
To be completed by Development Team and returned to DEQ Brownfields for review & signature. Brownfields Project Name: Midtown Square Mall Brownfields Project Number: 09058-05-060 Work Plan Title: In-Situ Soil Characterization Work Plan
Date: 4/11/2024 Revision Number: 0 Be advised that this approval from DEQ Brownfields does not waive any applicable requirement to obtain any necessary permits, licenses, or certifications for the above listed activities nor does it waive any requirement to comply with applicable law for such activities.
Prospective Developer (PD): NR Met Property Owner LP Contact Person: Kyle Whitaker [phone] Click or tap here to enter text.Email: [e-mail] Property Owner (if different from above): Click or tap here to enter text. Contact Person: Click or tap here to enter text. Click or tap here to enter text.Click or tap here to enter text.Email: Click or tap here to enter text.
Environmental Consultant: Mid-Atlantic Associates, Inc. Contact Person: Shane Sisco, P.G. [phone] [phone]Email: [e-mail] Signature:

Brownfields Project Manager: Carolyn Minnich Phone Numbers: Office: Mobile:
Email: [e-mail] Signature:

04/11/2024

TABLE

VOCs SVOCs RCRA Metals
ES-1 6 feet 5 1,000 x x x --
ES-2 6 feet 5 1,000 x x x --
ES-3 6 feet 5 1,000 x x x DUP-1
ES-4 6 feet 5 1,000 x x x --
ES-5 6 feet 5 1,000 x x x --
Notes:
1)Composite samples will be homogenized from approximate 1 foot intervals from ground surface to proposed maximum depth below ground surface
VOCs = volatile organic compounds by EPA Method 8260
SVOCs = semi-VOCs by EPA Method 8270
RCRA = Resource Conservation and Recovery Act metals plus hexavalent chromium by EPA Methods 6020/7471/7199
QA/QA
SamplesSample Typeof Soil Aliquots Yards
Analytical Method
Midtown Square Mall
NCDEQ Brownfield Project #09058-05-060
Mid-Atlantic Project #H1824.00 - Task 50000
1200 Metropolitan Avenue, Charlotte, Mecklenburg County, North Carolina
Sample ID DepthSample Location
Totals
Proposed Deep Foundation
Excavation
Grab (VOCs)
Composite (SVOCs and Metals)
VOCs SVOCs RCRA Metals
TMW-1 x x x DUP-2
TMW-2 x x x --
TMW-3 x x x --
Notes:
VOCs = volatile organic compounds by EPA Method 8260
SVOCs = semi-VOCs by EPA Method 8270
RCRA = Resource Conservation and Recovery Act metals by EPA Methods 6020/7471
Sample ID Sample Location
Analytical Method QA/QA
Samples
Totals
Redevelopment Footprint
TABLE 2
Proposed Groundwater Sampling Matrix

DRAWINGS

´
DRAWN BY:
DRAFT CHECK BY:
ENGINEER CHECK BY:
APPROVED BY:
SITE MAP1200 METROPOLITAN AVENUE
CHARLOTTE, NORTH CAROLINA
REFERENCE: BOUNDARY DATA FROM MECKLENBURG COUNTY GIS. 2022 AERIAL IMAGERY FROM NCONE MAP. 1/16TH BUILDING SITE PLAN PROVIDED BY SK+I ARCHITECTURE DATED MAY 2023 .
DATE: MARCH 2024
JOB NO.: H1824.00
GIS NO.: 03G-H1824.00-02
DRAWING NO.: 1
Legend
Subject Property05010015020025Feet
1 inch = 50 feet
DHN
DHN
KRC
@A@A
@A
ES-1
ES-2
ES-3 ES-4
ES-5
TMW-3
TMW-2
TMW-1
´
DRAWN BY:
2
Legend
@A Proposed TemporaryMonitoring Well
Proposed In-SituAliquot Soil Boring
Proposed In-SituSampling Grid
Subject Property05010015020025Feet
1 inch = 50 feet
MSS
GCI
KRC
APPENDIX A
Deep Foundation Plans