23018_Corey Transmission_SIR_20220617

DWM Brownfields Inspection Report
Submitted By: jkslaughter_ncdenr
Submitted Time: 06/20/2022 7:40 AM

I. Inspection Information
Date & Time: 06/17/2022 10:10 AM Inspection Type: Meeting

Brownfields Staff:
Kevin Slaughter
Other Personnel:
Juliana Lima, Matt Vawder – Hart & Hickman
Location:
Lat: 35.2104714, Long: -80.8690329,

Brownfields Inspection Report: Corey Transmission Service (511 West Tremont), 23018-19-060
06/17/2022 10:10 AM
Page 2 of 8

II. Project Information
Number: 23018-19-060 Name: Corey Transmission Service (511 West
Tremont)
Address: 511, 527 W. Tremont
Avenue

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

Use of Basements: Not Observed Basement Violation: No
Summary: Inspected active VIMS fans mounted on the exterior of the townhome units
along W. Tremont (Photo 1). Each of the active fans checked during the Site Inspection
were operating. Inspected townhome foundations where VIMS barrier had been started
on prior Site Inspection (Photo 2), where no issues were observed. In addition, sub-slab
monitoring points and the plastic vaults which they are located within were also observed
during sub-slab sampling activities (Photos 5-9).
Summary: N/A

Summary: New construction townhomes in varying stages of completion. Sub-slab and
indoor air sampling performed on units bordering W. Tremont which are close to
occupancy

Summary: Exposed soils are present and are consistent with the EMP and site
development activities taking place.

Summary: N/A

Brownfields Inspection Report: Corey Transmission Service (511 West Tremont), 23018-19-060
06/17/2022 10:10 AM
Page 3 of 8

Storage of Chemicals: Not Observed Chemical Violation: No

Groundwater Monitoring Wells: Not Observed Monitoring Well Violation: No

Current Exposure to Public/Public Risk:

Summary: N/A

Condition:
Summary: N/A

No risk to the public was observed during the Site Inspection.
Brownfields Inspection Report: Corey Transmission Service (511 West Tremont), 23018-19-060
06/17/2022 10:10 AM
Page 4 of 8

IV. Inspector Comments

V. PHOTOGRAPHS

Photo 1: Low profile Fantech active VIMS fan on rear of townhome. Fan is plumbed into dark
brown gutter material being used as a VIMS Riser which exits on top of roof. Signage visible on
garage door warning contractors to keep door closed during IA air sampling event.

Observed sub-slab soil gas collection into 1.4-liter summa (and duplicate), in addition to a separate
sub-slab sampling event in which sorbent tubes were used for mercury sampling (Photos 5-9).
Confirmed that 2” dia. PVC monitoring points were properly purged prior to collecting sub-slab air
samples which they were, with H&H having a sheet of precalculated purge volumes and lengths of
time based on sampling pump flow rate. Observed helium leak checks, etc.

Brownfields Inspection Report: Corey Transmission Service (511 West Tremont), 23018-19-060
06/17/2022 10:10 AM
Page 5 of 8

Photo 2: VIMS barrier installed over stone and sub-slab piping observed during prior inspection.

Photo 3: Signage used on garage and front doors during sub-slab and indoor air sampling.

Brownfields Inspection Report: Corey Transmission Service (511 West Tremont), 23018-19-060
06/17/2022 10:10 AM
Page 6 of 8

Photo 4: Indoor air sampling Summa cannister.

Photo 5: Measuring sub-slab vacuum prior to air sample collection. Active VIMS was in
operation during the sampling event.
Brownfields Inspection Report: Corey Transmission Service (511 West Tremont), 23018-19-060
06/17/2022 10:10 AM
Page 7 of 8

Photo 6: Helium leak testing of sub-slab soil gas sampling train during sub-slab sample and
duplicate collection.

Photo 7: Calibrating mercury pump flow rate by measuring pump air flow rate with air flow
meter. Following flow calibration, mercury sampling sorbent tube installed on suction side of
pump tubing for sample collection.
Brownfields Inspection Report: Corey Transmission Service (511 West Tremont), 23018-19-060
06/17/2022 10:10 AM
Page 8 of 8

Photo 8: Mercury sampling apparatus. Sample to be taken over approximately two-hour period
to reach desired detection limits.

Photo 9: Close up of sealed “Field Blank” mercury sorbent tube.