25067_Dynatech III_SIR_20220929

DWM Brownfields Inspection Report
Submitted By: jkslaughter_ncdenr
Submitted Time: 09/30/2022 7:46 AM

I. Inspection Information
Date & Time: 09/29/2022 9:13 AM Inspection Type: Meeting

Brownfields Staff:
Kevin Slaughter
Other Personnel:
David Kahn, Erin Lash, Andrew Besu - Hart &
Hickman (H&H) & Elite Radon personnel.
Location:
Lat: 35.21111248, Long: -80.8707626

Brownfields Inspection Report: Dynatech III, 25067-21-060
09/29/2022 9:13 AM
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II. Project Information
Number: 25067-21-060 Name: Dynatech III
Address: 2207, 2213, 2301,
2325 Toomey Av; 704, 728 W.
Tremont

City: Charlotte

County: Mecklenburg

III. Environmental

Current Use of Property: Residential
Structures on Property: New Structures Violation: No

Vapor Mitigation Systems: Observed Vapor Mitigation Violation: No

Use of Surface Water or Groundwater: Not Observed Water Use Violation: No

Exposed Soils: Observed Exposed Soils Violation: No
Summary: Subgrade soil contact walls were being treated with Geo-Seal CORE material
and Geo-Seal FILM 11 (HDPE) barrier. CORE material had already been applied to the
vertical concrete soil contact walls on arrival, and installers were in the process of sealing
the HDPE barrier seams and adhering it to the concrete footer at the time of the Site
inspection. NCBP issued verbal approval on August 27, 2022 via email granting approval
for MMS as it relates to this inspection.

Summary: N/A

Summary: New apartment complex currently under construction. Foundations are being
prepared and the draft Methane Mitigation System (MMS) Design Rev 1 dated July 2022
prepared by GeoSyntec is being implemented until final document available. Hart &
Hickman is the engineering firm completing field inspections and site oversight as of the
time of this inspection.

Summary: Grading of soil taking place on-site at the time of the Site Inspection. Work is
consistent with EMP for the property.

Brownfields Inspection Report: Dynatech III, 25067-21-060
09/29/2022 9:13 AM
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Use of Basements: Observed Basement Violation: No

Storage of Chemicals: Observed Chemical Violation: No

Groundwater Monitoring Wells: Not Observed Monitoring Well Violation: No

Current Exposure to Public/Public Risk:

Summary: Soil contact interior walls are proposed for portions of the apartment complex
(Photos 1 – 4). VIMS treatment of soil contact walls covered previously, and in Inspector
Comments.

Summary: Geo-Seal spray CORE material being used during the installation of vertical
VIMS barrier at the time of the Site Inspection (Photo 5).

Condition:
Summary: N/A

No risk to the public observed at the time of the Site Inspection.

Brownfields Inspection Report: Dynatech III, 25067-21-060
09/29/2022 9:13 AM
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IV. Inspector Comments

V. PHOTOGRAPHS

Photo 1: View of VIMS barrier installation on western vertical soil contact walls during Site
Inspection facing
The purpose of the Site Inspection was to attend a 9 AM vertical soil contact walls VIMS barrier
inspection. The section of wall is located on the western corner of the property. At the time of
the Site Inspection, the vapor barrier installation had not been completed, and the installers were
working on completing the installation of the green HDPE barrier over the spray core material
(Photos 1-4). The DEQ inspector and H&H personnel departed the site prior to the completion of
the VIMS barrier installation which was postponed. Later in the day, the DEQ inspector received a
call from H&H that the completed section of VIMS barrier would be re-inspected by H&H that
afternoon. The vapor barrier re-inspection was not attended by DEQ personnel.

Brownfields Inspection Report: Dynatech III, 25067-21-060
09/29/2022 9:13 AM
Page 5 of 7

Photo 2: View of concrete soil contact wall sprayed with Geo-Seal CORE material prior to
installation of green Geo-Seal FILM 11 (HDPE) barrier.

Photo 3: Close-up of CORE material spray applied to soil contact walls. Core material applied to
soil contact walls at 100-mil thickness as it is being used as a vapor and moisture barrier.
Brownfields Inspection Report: Dynatech III, 25067-21-060
09/29/2022 9:13 AM
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Photo 4: Spraying CORE material along Geo-Seal HDPE barrier seams and sealing barrier to
concrete footer.

Photo 5: Spray barrier equipment and product set-up. Rolls of drainage mat visible on right
side of photo. Drainage mat to be applied to exterior of vapor barrier.
Brownfields Inspection Report: Dynatech III, 25067-21-060
09/29/2022 9:13 AM
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Photo 6: Cupolex aerated floor modules staged for future horizontal installation.

Photo 7: Several large tree stumps were observed onsite with varying amounts of soil adhered
to them.