23070_Red Carpet Inn_Assessment Work Plan_20210312

01671-003/00287144 01675-001/00215831
Terracon Consultants, Inc. 2701 Westport Road Charlotte, North Carolina 28208
P [704] 509 1777 F [704] 509 1888 terracon.com

March 12, 2021

North Carolina Department of Environmental Quality
Division of Waste Management – Brownfields Program
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Attn: Mr. William Schmithorst
P: [phone]
E: [e-mail]

Re: Work Plan for Data Gap Assessment
Red Carpet Inn Brownfields Site (AKA Morehead Overlook)
615 East Morehead Street
Charlotte, Mecklenburg County, North Carolina
NCBP #23070-19-060
Terracon Project No. 71197661

Dear Mr. Schmithorst:

On behalf of MOD CLT Property, LLC (Prospective Developer), Terracon Consultants, Inc.
(Terracon) is pleased to submit this Work Plan to conduct additional sampling at the above-
referenced proposed Brownfields property (the “site”) in Charlotte, North Carolina. The site
was accepted into the North Carolina Brownfields Program (NCBP) as Project No. 23070-
19-060. The purpose of the additional sampling is to confirm the prior soil gas sampling
results and to confirm that vapor mitigation is not necessary for the project.

Terracon Consultants, Inc. is licensed to practice geology and engineering in North Carolina.
The certification numbers of the Corporation are C-367 and F-0869, respectively.

A. PROJECT INFORMATION

The site consists of two adjoining parcels totaling 2.83 acres located at 615 E. Morehead
Street in Charlotte, North Carolina (Exhibit 1). The northeastern portion of the site is
developed as an asphalt-paved parking area. The southwestern portion of the site is
presently undeveloped land but was formerly developed with a four-story Red Carpet Inn
and a two-story parking garage. The Mecklenburg County GIS website identifies the site as
Parcel Nos. 125-175-06 and 125-175-19.

Numerous subsurface investigations have been conducted at the site since 2000 to
investigate impacts related to a release from a former underground storage tank (UST)
system located on the adjacent property to the northwest of the site. The locations of
historical soil, groundwater, and soil vapor samples collected on the site are shown in
Exhibits 2 and 3, while a summary of analytical results (for compounds detected in at least
Work Plan for Data Gap Assessment
Red Carpet Inn Brownfields Site ■ Charlotte, North Carolina
March 12, 2021 ■ Terracon Project No. 71197661

Responsive ■ Resourceful ■ Reliable 2

one historical sample) are provided in Tables 1 through 5. These data were previously
compiled and submitted to the NCBP Project Manager, Mr. Bill Schmithorst, on February 17,
2021. Based on review of the data, the NCBP has requested that five additional shallow soil
vapor samples be collected at the locations shown on Exhibit 3.

B. ADDITIONAL SOIL VAPOR SAMPLING

Pre-Task Planning and Utility Locating
Terracon has a 100% commitment to the safety of all its employees. As such, and in
accordance with our Incident and Injury Free® safety culture, Terracon will develop a safety
plan to be used by our personnel during field services. Prior to commencement of on-site
activities, Terracon will hold a meeting to review health and safety needs for this specific
project. At this time, we anticipate performing fieldwork in a USEPA Level D work uniform
consisting of a hard hat, safety glasses, safety vest, protective gloves, and steel-toed boots.
It may become necessary to upgrade this level of protection while sampling activities are
being conducted should contaminants be encountered in soils or groundwater that present
an increased risk for personal exposure.

Prior to drilling activities, Terracon will contact NC-One Call, a public utility locating company,
to locate on-site underground utilities. In addition, Terracon will engage a private utility
locator to identify underground utilities that could be present at the boring locations.

Soil Vapor Point Installation and Sampling
Technical approaches and methods outlined in this proposed soil vapor investigation are in
general accordance with the Interstate Technical and Regulatory Council’s Vapor Intrusion:
A Practical Guideline (2007) and Vapor Intrusion Pathway: Investigative Approaches for
Typical Scenarios (2007), as well as the North Carolina Division of Waste Management
(DWM) Vapor Intrusion Guidance (2018).

Terracon will install five shallow exterior soil vapor sample points (2021-SV-01 through
2021-SV-05). Soil vapor points will be installed within direct push technology (DPT)
boreholes advanced to approximately 8 feet below land surface (bls). If shallow groundwater
is encountered (not anticipated based on historical data), or if moisture or soil lithologies that
appear likely to limit air flow enough to interfere with sample collection are observed, the
total depth of the boring may be adjusted accordingly. However, the stainless-steel screen
implant will not be located shallower than 5 feet bls, per NCBP requirements.

The points will be constructed by placing a six-inch stainless-steel screen implant at the
base of the boring within a one-foot thick layer of sand. A one-foot thick layer of dry granular
bentonite will be placed above the sand pack. Hydrated bentonite will be used to complete
the borehole to the surface. Teflon-lined tubing will extend from the implant to the surface,
where it will be capped. The point will be allowed to equilibrate for at least two hours prior to
Work Plan for Data Gap Assessment
Red Carpet Inn Brownfields Site ■ Charlotte, North Carolina
March 12, 2021 ■ Terracon Project No. 71197661

Responsive ■ Resourceful ■ Reliable 3

purging and sampling in accordance with standard industry practice for soil vapor points
installed by DPT methods.

To test the integrity of the sampling train and the vapor sampling point seals, a shut-in test
and a helium tracer test will be conducted at each sample point. The shut-in test will be
conducted by attaching the laboratory-supplied Summa® canister and flow controller
manifold to be used at each point to Teflon® lined tubing and a syringe. The syringe will be
used to induce a vacuum within the flow controller manifold, at which point, the manifold’s
shut-off valve will be closed. The Summa® canister and manifold will be allowed to sit sealed
from the atmosphere for a minimum of five minutes and the pressure within the manifold at
the beginning and the end of the shut-in period will be recorded and compared. If there is no
observable loss of pressure during the shut-in test period, the Summa® canister and
manifold will be deemed suitable for sample collection.

The tracer gas serves as a quality assurance/quality control (QA/QC) method to verify the
integrity of the soil vapor probe seal. A field instrument capable of detecting helium will be
used to verify the presence and concentration of the tracer gas. The protocol for using a
tracer gas is to enclose the tubing and ground interface with a shroud and enrich the shroud
atmosphere with helium (typically to approximately 15%). Three volumes of the vapor point
annulus and attached Teflon® lined tubing will be purged. Purge samples will be field-
screened for helium after each purge volume to assess for the presence of leaks in the seal
and fittings using an MGD-2002 helium/hydrogen meter (or equivalent device) and for
volatile vapors using a photo-ionization detector (PID). Sample collection will begin if the
tracer testing indicates helium concentrations in the vapor point are less than 10 percent of
the helium concentration in the shroud, indicating a sealed vapor point annulus.

After purging, soil vapor samples will be collected in a laboratory supplied, batch-certified
1-liter Summa® canister with a flow controller set for to draw air at less than 200 milliliters
per minute (mL/min). The vacuum pressure of the sample canister will be monitored and
recorded at regular intervals throughout the sampling period. Terracon will cease sample
collection prior to the vacuum pressure reaching 0 mmHg. One blind duplicate sample will
be collected in the field and submitted for analysis to assess laboratory precision.

Following completion of the field activities, the Summa® canisters, along with chain-of-
custody documentation, will be shipped to Con-Test Analytical Laboratory in East
Longmeadow, Massachusetts (now part of the Pace Analytical family of laboratories) for
laboratory analysis of volatile organic compounds (VOCs) by EPA Method TO-15. North
Carolina does not certify laboratories for air analysis; however, Con-Test is certified to
perform air analyses in the following States: Florida (#E871027 NELAP); Virginia (#1381);
New Jersey (#MA007 NELAP) and Maine (#2011028). Con-Test will be contacted in
advance of the soil vapor sampling event to ensure that the method detection limits will be
lower than the applicable screening level concentrations (to the degree technologically
Work Plan for Data Gap Assessment
Red Carpet Inn Brownfields Site ■ Charlotte, North Carolina
March 12, 2021 ■ Terracon Project No. 71197661

Responsive ■ Resourceful ■ Reliable 4

feasible). Terracon will note estimated concentrations between the laboratory reporting limits
and method detection limits (“J-flagged” concentrations), if any, in the report. In addition,
Terracon will request Con-Test record the sample canister vacuums on the chain-of-custody
documentation upon their receipt. A level 2 QA/QC data package will be requested for the
soil vapor samples.

C. BROWNFIELDS ASSESSMENT REPORT

Upon completion of the soil vapor sampling activities and receipt of the laboratory analytical
results, a report will be prepared that will include the following items:

◼ Documentation of field activities;
◼ Site plan showing pertinent site features;
◼ Soil boring logs;
◼ Laboratory analytical results;
◼ Data evaluation including comparison of soil data to applicable regulatory standards
and modeling risk to future site occupants using the NCDEQ Risk Calculator; and,
◼ Recommendations concerning further action, if necessary

The report will be completed in a format suitable for submittal to the North Carolina
Brownfields Program. Work associated with this scope of services will be performed under
the direction of a Licensed Geologist registered in the State of North Carolina.

D. CLOSING

We appreciate the opportunity to provide this work plan and look forward to working with you
on this project. If you have any questions or comments regarding this proposal or require
additional services, please contact us at [phone].

Sincerely,
TERRACON CONSULTANTS, INC.

William O. Frazier, P.G. Christopher L. Corbitt, P.G.
Project Geologist Senior Geologist

Attachments: Figure 1 – Topographic Map
Figure 2 – Historical Soil Sample Locations
Figure 3 – Historical/Proposed Groundwater and Soil Vapor Sample Locations
Tables 1 through 5 – Summary of Historical Analytical Results

APPROXIMATE
SITE BOUNDARY
TOPOGRAPHIC MAP
Red Carpet Inn Brownfields Site(AKA Morehead Overlook)NCBP #23070-19-060
615 East Morehead Street
Charlotte, Mecklenburg County, North Carolina
TOPOGRAPHIC MAP IMAGE COURTESY OF THE U.S. GEOLOGICAL SURVEY QUADRANGLES INCLUDE: CHARLOTTE EAST, NC (1/1/1988).
2701 Westport Road
Charlotte, NC 28208-3608
71197661 Project Manager:
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Checked by:
Approved by:
WOF
CLC
CLC
1”=2,000’
71197661.1
Mar. 2021
Project No.
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File Name:
Date: 1
WOF Exhibit
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EXHIBIT NO.
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WOF
WOF
CLC
CLC 2701 Westport Road Charlotte, North Carolina 28208Phone: [phone] Fax: [phone]
Historical Soil Sample Locations
Red Carpet Inn Brownfields Site(AKA Morehead Overlook)NCBP #23070-19-060615 East Morehead Street2/10/2021 Charlotte, Mecklenburg County, North Carolina
71197661
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0 200100Feet
Legend
Site BoundaryTax Parcels
&>Soil Sample
East M
orehead Street Euclid AvenueRoyal Court
B-11/MW-10
B-6/MW-6
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B-7
P-2/TW-1
P-5
P-1
P-3
P-8
P-4
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P-9
B-5/MW-3
B-8/MW-1
B-9/MW-2
B-10/MW-4
GP-9GP-8
GP-7
BG-1
BG-2
S-1
S-2/TW-2
S-3/TW-3
S-4/TW-4
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EXHIBIT NO.
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1 in = 100 ft
Project No.
Scale:
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WOF
WOF
CLC
CLC 2701 Westport Road Charlotte, North Carolina 28208Phone: [phone] Fax: [phone]
Historical and Proposed Groundwater and SoilVapor Sample Locations
Red Carpet Inn Brownfields Site(AKA Morehead Overlook)NCBP #23070-19-060615 East Morehead StreetCharlotte, Mecklenburg County, North Carolina3/10/2021
71197661
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0 200100Feet
Legend
Site Boundary
@A Historical Vapor Intrusion GWSL Exceedance
@A Historical Groundwater Sample
#*Historical Soil Vapor Sample
#*Proposed Soil Vapor Sample
East M
orehead Street Euclid AvenueRoyal Court
B-11/MW-10
B-6/MW-6
B-8/MW-7
MW-11
P-2/TW-1
P-10/TW-2
B-5/MW-3
B-8/MW-1
B-9/MW-2
B-10/MW-4
HHTW-4
HHTW-5
S-2/TW-2
S-3/TW-3
S-4/TW-4
SV-03
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SV-01
Garage
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etail ResidentialResidentialResidential
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2021-SV-05
Table 1
Summary of Historical Soil Analytical Results
Red Carpet Inn Brownfields Site
Brownfields Site No. 23070-19-060
615 East Morehead Street
Charlotte, Mecklenburg County, North Carolina
Terracon Project No. 71197661
Sample ID:B-6 (MW-6)B-7 B-8 (MW-7)B-11 (MW-10)P-2 P-4
Sample Interval (ft bgs):19-21 24-26 9-11 14-16 4-8 12-16 12-16 8-12 12-16 12-16
Sample Date:2/26/1996 2/26/1996 2/26/1996 2/26/1996 9/28/2000 9/28/2000 9/28/2000 9/28/2000 9/28/2000 9/28/2000
Gasoline Range Organics ND ND ND ND NS NS NS NS NS NS NE NE NE
MADEP VPH
C5-C8 Aliphatics NS NS NS NS ND ND 120 ND ND ND NE NE NE
C9-C12 Aliphatics NS NS NS NS ND 31 1,300 39 95 240 NE NE NE
C9-C22 Aromatics NS NS NS NS ND ND 250 ND ND 53 NE NE NE
Residential
PSRGs
Non-Residential
PSRGs
Total Petroleum Hydrocarbons (TPH)
PoG PSRG
Volatile Organic Compounds by EPA Method 8260
P-1 P-3
Benzene NS NS NS NS ND ND ND ND ND ND 0.01 1.2 5.4
Toluene NS NS NS NS ND 0.4 ND ND 0.049 ND 8.3 990 9,700
Ethylbenzene NS NS NS NS ND 0.64 ND ND 0.056 0.048 13 6.1 27
Xylenes NS NS NS NS ND 3.2 ND ND 0.31 0.251 9.8 120 500
Isopropylbenzene NS NS NS NS ND 0.19 ND ND ND 0.036 2.3 410.0 2,100
n-Propylbenzene NS NS NS NS ND 0.73 ND ND 0.048 0.16 2.6 780.0 5,100
1,2,4-Trimethylbenzene NS NS NS NS 0.031 4.5 9.1 0.028 0.38 1.1 12 63 370
1,3,5-Trimethylbenzene NS NS NS NS ND 1.3 2.6 0.0063 0.096 0.33 11 56 320
n-Butylbenzene NS NS NS NS ND 0.44 0.77 ND ND 0.13 4.5 780 12,000
sec-Butylbenzene NS NS NS NS ND 0.15 ND ND ND 0.045 4.1 1,600 23,000
tert-Butylbenzene NS NS NS NS ND ND 0.61 ND ND ND 3.1 1,600 23,000
p-Isopropyltoluene NS NS NS NS ND 0.081 0.15 ND ND ND NE NE NE
Naphthalene NS NS NS NS ND 1.0 2.1 0.0066 0.14 0.38 0.39 2.1 8.8
Methylene Chloride NS NS NS NS 0.0091 ND ND ND ND ND 0.025 58 650
Acetone NS NS NS NS ND ND ND ND ND ND 25 12000 250,000
Notes:
Results are shown in milligrams per kilogram (mg/kg).
ft bgs - Feet Below Ground Surface
ppm - parts per million
Only compounds detected within one or more sample are shown except for TPH- Gasoline Range Organics
NA - Not Analyzed
ND - Not Detected above laboratory method detection limit
NE - Not Established
Detections are indicated in bold.
J - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
PSRG - NCDEQ Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals (July 2020)
Shaded cells indicate the detected concentrations exceed the regulatory threshold of the corresponding color.
Table 1
Summary of Historical Soil Analytical Results
Red Carpet Inn Brownfields Site
Brownfields Site No. 23070-19-060
615 East Morehead Street
Charlotte, Mecklenburg County, North Carolina
Terracon Project No. 71197661
Sample ID:P-6 P-7 P-9
Sample Interval (ft bgs):8-12 12-16 8-12 8-12 12-16 13.5-15 16-17.5 16-17.5 18.5-20
Sample Date:9/28/2000 9/28/2000 9/28/2000 9/28/2000 9/28/2000 6/29/2005 6/29/2005 6/29/2005 6/29/2005
Gasoline Range Organics NS NS NS NS NS NS NS NS NS NE NE NE
MADEP VPH
C5-C8 Aliphatics ND 21 ND ND ND 0.78 J 0.56 J ND 1.0 J NE NE NE
C9-C12 Aliphatics ND 99 ND ND 59 ND ND ND ND NE NE NE
C9-C22 Aromatics ND 21 ND ND 12 1.5 3.2 ND 2.6 NE NE NE
Benzene ND 0.0063 ND ND ND 0.0053 0.003 J ND ND 0.01 1.2 5.4
Toluene ND 0.0064 ND ND 0.27 0.017 0.0093 0.00074 J 0.0025 J 8.3 990 9,700
Ethylbenzene ND 0.014 ND ND 0.62 0.011 0.018 0.00071 0.0014 13 6.1 27
Xylenes 0.032 0.09 ND ND 2.92 0.041 0.051 0.003 J 0.007 J 9.8 120 500
Isopropylbenzene ND 0.0078 ND ND 0.22 NS NS NS NS 2.3 410.0 2,100
n-Propylbenzene ND 0.031 ND ND 0.79 NS NS NS NS 2.6 780.0 5,100
1,2,4-Trimethylbenzene ND 0.25 ND ND 2.6 NS NS NS NS 12 63 370
1,3,5-Trimethylbenzene 0.033 0.077 ND ND 1.3 NS NS NS NS 11 56 320
n-Butylbenzene ND 0.043 ND ND 0.47 NS NS NS NS 4.5 780 12,000
sec-Butylbenzene ND 0.011 ND ND 0.18 NS NS NS NS 4.1 1,600 23,000
tert-Butylbenzene ND ND ND ND ND NS NS NS NS 3.1 1,600 23,000
p-Isopropyltoluene ND 0.0073 ND ND 0.094 NS NS NS NS NE NE NE
Naphthalene ND 0.12 ND ND 1.1 0.0038 J 0.0068 ND 0.0014 J 0.39 2.1 8.8
Methylene Chloride ND ND ND ND ND NS NS NS NS 0.025 58 650
Acetone ND ND ND ND ND ND ND ND ND 25 12000 250,000
Notes:
Results are shown in milligrams per kilogram (mg/kg).
ft bgs - Feet Below Ground Surface
ppm - parts per million
Only compounds detected within one or more sample are shown except for TPH- Gasoline Range Organics
NA - Not Analyzed
ND - Not Detected above laboratory method detection limit
NE - Not Established
Detections are indicated in bold.
J - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
PSRG - NCDEQ Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals (July 2020)
Shaded cells indicate the detected concentrations exceed the regulatory threshold of the corresponding color.
Total Petroleum Hydrocarbons (TPH)
Volatile Organic Compounds by EPA Method 8260
P-5 B-8 (MW-1)B-9 (MW-2)
PoG PSRG Residential
PSRGs
Non-Residential
PSRGs
Table 1
Summary of Historical Soil Analytical Results
Red Carpet Inn Brownfields Site
Brownfields Site No. 23070-19-060
615 East Morehead Street
Charlotte, Mecklenburg County, North Carolina
Terracon Project No. 71197661
Sample ID:GP-7
Sample Interval (ft bgs):13.5-15 16-17.5 16-17.5 18.5-20 16-18 10-12 14-16 8-10 11-13
Sample Date:6/29/2005 6/29/2005 6/29/2005 6/29/2005 1/21/2014 1/21/2014 1/21/2014 1/21/2014 1/21/2014
Gasoline Range Organics NS NS NS NS NS NS NS NS NS NE NE NE
MADEP VPH
C5-C8 Aliphatics ND ND 0.79 J 0.69 J ND ND ND ND 32 NE NE NE
C9-C12 Aliphatics ND ND ND ND ND ND ND ND ND NE NE NE
C9-C22 Aromatics 0.31 ND 0.69 J 0.69 J ND ND 17 ND 62 NE NE NE
Benzene ND ND ND ND ND ND ND ND ND 0.01 1.2 5.4
Toluene 0.0012 J 0.00054 J 0.00075 J 0.0024 J ND ND ND ND ND 8.3 990 9,700
Ethylbenzene 0.00078 J 0.0005 J 0.00075J 0.0012 J ND ND 0.019 ND 16 13 6.1 27
Xylenes 0.0049 J 0.0031 J 0.004 J 0.0068 J ND ND 0.10 ND 37 9.8 120 500
Isopropylbenzene NS NS NS NS ND ND 0.020 ND 6.5 2.3 410 2,100
n-Propylbenzene NS NS NS NS ND ND ND ND 29 2.6 780 5,100
1,2,4-Trimethylbenzene NS NS NS NS ND ND 0.22 ND 110 12 63 370
1,3,5-Trimethylbenzene NS NS NS NS ND ND 0.057 ND 35 11 56 320
n-Butylbenzene NS NS NS NS ND ND 0.096 ND 19 4.5 780 12,000
sec-Butylbenzene NS NS NS NS ND ND 0.022 ND 5.0 4.1 1,600 23,000
tert-Butylbenzene NS NS NS NS ND ND ND ND ND 3.1 1,600 23,000
p-Isopropyltoluene NS NS NS NS ND ND 0.013 ND 2.5 NE NE NE
Naphthalene ND ND ND ND ND ND ND ND 18 0.39 2.1 8.8
Methylene Chloride NS NS NS NS 0.0061 0.0079 ND ND ND 0.025 58 650
Acetone ND ND ND ND ND 0.019 ND ND ND 25 12000 250,000
Notes:
Results are shown in milligrams per kilogram (mg/kg).
ft bgs - Feet Below Ground Surface
ppm - parts per million
Only compounds detected within one or more sample are shown except for TPH- Gasoline Range Organics
NA - Not Analyzed
ND - Not Detected above laboratory method detection limit
NE - Not Established
Detections are indicated in bold.
J - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
PSRG - NCDEQ Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals (July 2020)
Shaded cells indicate the detected concentrations exceed the regulatory threshold of the corresponding color.
Non-Residential
PSRGs
Total Petroleum Hydrocarbons (TPH)
Volatile Organic Compounds by EPA Method 8260
B-10 (MW-4)B-5 (MW-3)GP-8 GP-9
PoG PSRG Residential
PSRGs
Table 2
Summary of Historical Groundwater Analytical Results
Red Carpet Inn Brownfields Site
Brownfields Site No. 23070-19-060
615 East Morehead Street
Charlotte, Mecklenburg County, North Carolina
Terracon Project No. 71197661
Sample ID:
Sample Date:3/1/1996 5/19/2000 1/2/2004 10/12/2005 1/26/2012 4/5/2012 1/17/2014 7/21/2014 3/1/1996 5/19/2000 3/22/1996 5/19/2000 6/30/2005
C5-C8 Aliphatics NA NA 8,700 20,000 NA 10,100 11,000 6,000 NA NA NA NA ND 400 NE NE NE
C9-C18 Aliphatics NA NA 1,100 7,800 NA 2,550 NA 1,300 NA NA NA NA ND 700 NE NE NE
C9-C22 Aromatics NA NA 5,500 8,100 NA 5,340 4,600 4,300 NA NA NA NA ND 200 NE NE NE
Benzene 1,800 600 280 170 38.6 NA 25 80 ND ND ND ND ND 1 5,000 16 69
Toluene 8,700 1,800 2,000 2,300 197 NA 240 1,300 ND ND ND ND ND 600 260,000 3,800 16,000
Ethylbenzene 2,400 1,100 1,100 1,600 402 NA 370 1,500 ND ND ND ND ND 600 84,500 35 150
Xylene 7,200 2,000 2,900 3,800 856 NA 1,090 5,700 ND ND ND ND 0.59 J 500 85,500 77 320
MTBE 120 ND ND ND ND NA ND ND 2.8 ND ND ND 140 20 20,000 4,500 2,000
IPE ND 340 ND NA ND NA ND ND ND ND ND ND NA 70 70,000 1,400 5,900
EDB 0.022 ND ND NA ND NA ND ND ND ND ND ND NA 0.02 50 1.8 7.7
Chloroform NA NA NA NA ND NA ND ND ND ND ND ND NA 70 70,000 8.1 36
Trichloroethene ND ND NA NA ND NA ND ND ND ND ND ND NA 3 3,000 1.0 4.4
Naphthalene 270 NA NA NA 210 NA 98 310 ND NA NA NA 1.3 J 6 6,000 35 150
Isopropylbenzene NA NA NA NA 53.3 NA 45 73 NA NA NA NA NA 70 25,000 180 750
p-Isopropyltoluene NA NA NA NA ND NA 8.4 8.0 NA NA NA NA NA 25 11,700 NE NE
2-Butanone NA NA NA NA ND NA ND ND NA NA NA NA NA 4,000 4,000,000 450,000 1,900,000
n-Butylbenzene NA NA NA NA ND NA 43 20 NA NA NA NA NA 70 6,900 NE NE
sec-Butylbenzene NA NA NA NA ND NA 14 12 NA NA NA NA NA 70 8,500 NE NE
tert-Butylbenzene NA NA NA NA ND NA NA NA NA NA NA NA NA 70 15,000 NE NE
n-Propylbenzene NA NA NA NA 86.7 NA 98 160 NA NA NA NA NA 70 30,000 490 2,000
1,2,4-Trimethylbenzene NA NA NA NA 337 NA 620 1,700 NA NA NA NA NA 400 28,500 50 210
1,3,5-Trimethylbenzene NA NA NA NA 96.9 NA 200 460 NA NA NA NA NA 400 25,000 35 150
Bis(2-ethylhexyl)phthalate ND NA NA NA NA NA NA NA 4.3 NA NA NA NA 3 170 NE NE
Phenol ND NA NA NA NA NA NA NA 1.6 NA NA NA NA 30 30,000 NE NE
Lead 0.0093 J ND NA NA NA ND 4.5 ND 0.0089 J ND ND ND NA 15 15,000 NE NE
Notes:
Data obtained from the following prior reports prepared by others: LAW Engineering Comprehensive Site Assessment (1996); LAW Report of Groundwater Monitoring (2000); ECS Assessment of Petroleum Impacted Soils (2000); S&ME Soil and Groundwater Assessment Report (2004);
Schnabel Environmental Assessment (2004); Hart & Hickman Pre-CAP Monitoring Plan (2014); and Hart & Hickmman Groundwater Monitoring Report (2014).
NA - Not Analyzed
ND - Not Detected above laboratory method detection limits
NE - Not Established
All results are shown in micrograms per liter (µg/L).
Only compounds detected in one or more sample are shown.
Detections are indicated in bold.
J - Estimated concentration between method detection limit and reporting limit.
Concentrations highlighted in yellow exceed their respective NCDEQ 2L groundwater standards (or Interim Maximum Contaminant Levels if a 2L standard has not been established).
Concentrations highlighted in orange exceed their respective Gross Contaminant Levels.
Concentrations shaded in green exceed their respective NCDEQ Residential Groundwater Screening Levels for Vapor Intrusion (February 2018).
Concentrations shaded in blue exceed their respective NCDEQ Non-Residential Groundwater Screening Levels for Vapor Intrusion (February 2018).
In cases where a concentration exceeds multiple standards, the shading for the exceedance of a vapor standard is given preference.
Gross
Contaminant Level
VI-GWSL
Residential
VI-GWSL Non-
Residential
NCDEQ 2L
Groundwater
Standard
Analyte
Semi-Volatile Organic Compounds by EPA Method 8270
MADEP VPH
Lead by EPA Method 6010
Volatile Organic Compounds by EPA Method 8260, 601/602, and/or 504-1
MW-7 MW-10MW-6
Table 2
Summary of Historical Groundwater Analytical Results
Red Carpet Inn Brownfields Site
Brownfields Site No. 23070-19-060
615 East Morehead Street
Charlotte, Mecklenburg County, North Carolina
Terracon Project No. 71197661
Sample ID:MW-11 TW-1 (P-2)*TW-2 (P-10)MW-2 MW-3 MW-4 HTTW-4 HTTW-5
Sample Date:10/5/2000 10/5/2000 10/5/2000 6/30/2005 6/30/2005 6/30/2005 1/22/2014 1/22/2014
MADEP VPH
C5-C8 Aliphatics ND 3,700 6,200 ND ND ND 620 66 400 NE NE NE
C9-C18 Aliphatics ND 26,000 42,000 ND ND ND 71 100 700 NE NE NE
C9-C22 Aromatics ND 2,400 3,900 ND ND ND 720 75 200 NE NE NE
Volatile Organic Compounds by EPA Method 8260, 601/602, and/or 504-1
Benzene ND ND 16,000 190 1.2 NA 6.6 ND 1 5,000 16 69
Toluene ND ND 77,000 1,300 NA 0.26 J 0.82 ND 600 260,000 3,800 16,000
Ethylbenzene ND ND 25,000 1,800 NA NA 4.3 ND 600 84,500 35 150
Xylene ND ND 121,000 7,400 NA 0.41 J 2 ND 500 85,500 77 320
MTBE ND ND ND ND ND 4.5 J ND 1.9 20 20,000 4,500 2,000
IPE ND ND ND NA NA NA 8.5 ND 70 70,000 1,400 5,900
EDB NA NA NA NA NA NA ND 0.033 0.02 50 1.8 7.7
Chloroform ND 5.3 ND NA NA NA 0.29 1.7 70 70,000 8.1 36
Trichloroethene ND ND ND NA NA NA ND 1.1 3 3,000 1.0 4.4
Naphthalene NA NA NA 730 2.9 ND 2.7 ND 6 6,000 35 150
Isopropylbenzene NA NA NA NA NA NA ND ND 70 25,000 180 750
p-Isopropyltoluene NA NA NA NA NA NA ND ND 25 11,700 NE NE
2-Butanone NA NA NA NA NA NA 6.1 ND 4,000 4,000,000 450,000 1,900,000
n-Butylbenzene NA NA NA NA NA NA 2.9 ND 70 6,900 NE NE
sec-Butylbenzene NA NA NA NA NA NA 3.5 ND 70 8,500 NE NE
tert-Butylbenzene NA NA NA NA NA NA 0.3 ND 70 15,000 NE NE
n-Propylbenzene NA NA NA NA NA NA 1.8 ND 70 30,000 490 2,000
1,2,4-Trimethylbenzene NA NA NA NA NA NA 1.5 ND 400 28,500 50 210
1,3,5-Trimethylbenzene NA NA NA NA NA NA 0.44 ND 400 25,000 35 150
Semi-Volatile Organic Compounds by EPA Method 8270
Bis(2-ethylhexyl)phthalate NA NA NA NA NA NA NA NA 3 170 NE NE
Phenol NA NA NA NA NA NA NA NA 30 30,000 NE NE
Lead by EPA Method 6010
Lead NA NA NA NA NA NA 5.5 34 15 15,000 NE NE
Notes:
Data obtained from the following prior reports prepared by others: LAW Engineering Comprehensive Site Assessment (1996); LAW Report of Groundwater Monitoring (2000); ECS Assessment of Petroleum Impacted Soils (2000); S&ME Soil and Groundwater Assessment Report (2004);
Schnabel Environmental Assessment (2004); Hart & Hickman Pre-CAP Monitoring Plan (2014); and Hart & Hickmman Groundwater Monitoring Report (2014).
NA - Not Analyzed
ND - Not Detected above laboratory method detection limits
NE - Not Established
All results are shown in micrograms per liter (µg/L).
Only compounds detected in one or more sample are shown.
Detections are indicated in bold.
J - Estimated concentration between method detection limit and reporting limit.
Concentrations highlighted in yellow exceed their respective NCDEQ 2L groundwater standards (or Interim Maximum Contaminant Levels if a 2L standard has not been established).
Concentrations highlighted in orange exceed their respective Gross Contaminant Levels.
Concentrations shaded in green exceed their respective NCDEQ Residential Groundwater Screening Levels for Vapor Intrusion (February 2018).
Concentrations shaded in blue exceed their respective NCDEQ Non-Residential Groundwater Screening Levels for Vapor Intrusion (February 2018).
In cases where a concentration exceeds multiple standards, the shading for the exceedance of a vapor standard is given preference.
Analyte
NCDEQ 2L
Groundwater
Standard
Gross
Contaminant Level
VI-GWSL
Residential
VI-GWSL Non-
Residential
Table 3
2020 Soil Analytical Results
Proposed Morehead Overlook
615 E. Morehead StreetCharlotte, Mecklenburg County,NC Terracon Project No.
71197661
Sample ID:S-1 S-2 S-3 S-4 BG-1 BG-2
Sample Date:02/21/20 02/21/20 02/21/20 02/21/20 02/21/20 02/21/20
Sample Interval
(ft bgs):10-15 10-14 5-10 0-5
25 12,000 140,000 0.0108J 0.0128J 0.019J <0.0069 NA NA
4.5 780 12,000 0.0124 <0.0022 <0.0023 <0.0021 NA NA
4.1 1,600 23,000 0.0026J <0.0017 <0.0017 <0.0016 NA NA
2.3 410 2,100 0.0013J <0.0011 <0.0012 <0.0011 NA NA
1.24 NS NS 0.0059 <0.0019 <0.002 <0.0018 NA NA
0.39 4.1 18 0.027 <0.0033 <00034 <0.0031 NA NA
2.6 780 5,100 0.0058 <0.0013 <0.0014 <0.0012 NA NA
12 63 370 0.052 <0.0015 <0.0016 <0.0014 NA NA
11 56 320 0.0131 <0.0013 <0.0014 <0.0012 NA NA
9.9 120 530 0.0021J <0.0027 <0.0028 <0.0026 NA NA
5.8 0.68 3 0.67J 1.4 2.2 0.72 2.6 1.3
580 3,100 47,000 194 18.2 30 65.7 113 31
360,000 23,000 350,000 22.3 7.6 104 42 19.8 5.9
270 400 800 2.1 2 6.3 2.3 7.2 7.1
1 2.3 9.7 <0.0027 0.008 0.043 0.011 0.015 0.043
Notes:
All results are shown in milligrams per kilogram (mg/kg).
ft bgs - Feet Below Ground Surface
NS - No Standard
ND - Not detected
NA- Not analyzed
J - estimated concentration above the method detection limit but below the laboratory reporting limit
Total chromium is assumed to consist exclusively of trivalent chromium since hexavalent chromium was not detected in the soils.
PSRG - NCDEQ Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals, updated December, 2019.
Concentrations highlighted in yellow exceed their respective residential PSRG.
Concentrations highlighted in orange exceed their respective non-residential PSRG.
No semi-volatile organic compounds were detected.
Semi-Volatile Organic Compounds by EPA Method 8270
Naphthalene
n-Propylbenzene
1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
Total Xylenes
Volatile Organic Compounds by EPA Method 8260
Analyte
Acetone
Mercury
RCRA Metals by EPA Method 6010, 7196, and 7471
Arsenic
Barium
Chromium
Lead
Residential
PSRGs
Non-
Residential
PSRGs
Protection of
Groundwater
PSRGs
n-Butylbenzene
sec-Butylbenzene
Isopropylbenzene (Cumene)
p-Isopropyltoluene
Table 4
2020 Groundwater Analytical Results
Proposed Morehead Overlook
615 E. Morehead Street
Charlotte, Mecklenburg County, NC
Terracon Project No. 71197661
Sample ID:TW-2 TW-3 TW-4
Sample Date:02/21/20 2/21/2020 2/21/2020
Screen Interval (ft bgs):9-24 16-31 25-40
Benzene 1 45.1 <0.15 <0.15
Diisopropyl ether 70 <1.1 <0.22 0.22J
Ethylbenzene 600 636 <0.26 <0.26
p-Isopropyltoluene 25 17.5 <0.21 <0.21
Methyl tert-butyl ether 20 <1.4 0.31J 0.31J
Naphthalene 6 186 0.65J <0.35
Toluene 600 421 <0.24 <0.24
Total Xylenes 500 810 1.7 <0.63
Benzo(a)anthracene 0.05 <1.5 <1.5 3.7J
Benzo(a)pyrene 0.005 <1.8 <1.8 4.1J
Benzo(b)fluoranthene 0.05 <1.7 <1.7 3.8J
Benzo(g,h,i)perylene 200 <1.6 <1.6 4.7J
Benzo(k)fluoranthene 0.5 <1.5 <1.5 4.2J
Butylbenzylphthalate 1000 <1.9 <1.9 3.8J
Chrysene 5 <1.4 <1.4 4.2J
Dibenz(a,h)anthracene 0.005 <1.6 <1.6 4.5J
Di-n-butylphthalate 700 <1.6 <1.6 2.9J
Di-n-octylphthalate 100 <2.2 <2.2 4.6J
bis(2-Ethylhexyl)phthalate 3 <2.0 <2.0 4.6J
Fluoranthene 300 <1.6 <1.6 2.7J
Hexachlorobenzene 0.02 <1.3 <1.3 1.4J
Indeno(1,2,3-cd)pyrene 0.05 <1.7 <1.7 4.5J
1-Methylnaphthalene 1 16.5 <1.4 <1.4
2-Methylnaphthalene 30 24 <1.4 <1.4
Naphthalene 6 63 <1.6 <1.6
Phenanthrene 200 <1.4 <1.4 1.6J
Pyrene 200 <1.5 <1.5 2.8J
Barium 700 92.9 133 66.7
Lead 15 <1.6 1.8J <1.6
Notes:
Concentrations are reported in micrograms per liter (µg/L).
Only detected compounds are shown.
J - estimated concentration above the method detection limit but below the laboratory reporting limit
NCAC 2L GWQS - North Carolina Administrative Code Subchapter 2L Groundwater Quality Standards (April 1, 2013).
Concentrations highlighted in yellow exceed their respective NCAC 2L GWQS
RCRA Metals by EPA Method 6010
Mercury not detected in any of the samples.
Analyte NCAC 2L
GWQS
Volatile Organic Compounds by EPA Method 8260
Mercury by EPA Method 7470
Semi-Volatile Organic Compounds by EPA Method 8270
Table 5
2020 Soil Vapor Analytical Results
Proposed Morehead Overlook 615
E. Morehead Street
Charlotte, Mecklenburg County, NC
Terracon Project No. 71197661
Sample ID:SV-01 SV-02 DUP-01
(SV-02)SV-03 SV-04 SV-05
Sample Depth:4.5-5 3-3.5 3-4 4.75-5.25 4.5-5 4.5-5
Helium NS <0.1 %NS NS NS NS NE NE
12.6 6.56 6.2 6.68 60.6 7.51 220,000 2,700,000
Benzene <0.639 <0.639 <0.639 <0.639 3.51 <0.639 120 1,600
Carbon Disulfide 11.2 <0.622 <0.622 13.4 220 16.8 4,900 61,000
Chloroform <0.973 1.24 0.988 1.02 8.37 1.14 8.1 530
Chloromethane 0.551 <0.413 0.477 <0.413 6.92 1.13 630 7,900
Cyclohexane <0.689 <0.689 <0.689 <0.689 1.17 <0.689 42,000 530,000
1,3-Dichlorobenzene 3.23 5.31 3.14 6.13 <1.20 6.43 NE NE
Ethanol 82.8 45.6 49.4 25.8 21.7 39 NE NE
Ethylbenzene <0.867 <0.867 <0.867 1.19 8.71 <0.867 370 4,900
4-Ethyltoluene <0.982 <0.982 <0.982 1.65 9.91 <0.982 NE NE
Trichlorofluoromethane (Freon 11)<1.12 1.12 1.16 1.54 1.78 8.04 NE NE
Dichlorodifluoromethane (Freon 12)1.61 1.67 1.77 1.69 2.03 4.64 700 8,800
Heptane <0.818 <0.818 <0.818 <0.818 3.19 <0.818 2,800 35,000
Hexane <0.705 <0.705 <0.705 <0.705 2.98 <0.705 4,900 61,000
Methyl Ethyl Ketone (2-Butanone)<3.69 <3.69 <3.69 <3.69 8.14 <3.69 35,000 440,000
Methyl tert-Butyl Ether (MTBE)<0.721 <0.721 <0.721 <0.721 3.96 <0.721 3,600 47,000
Methylene Chloride 1.26 <0.694 0.802 <0.694 <0.694 <0.694 4,200 1,800,000
2-Propanol 5.73 4.52 <3.07 18.2 4.62 4.01 1,400 18,000
Tetrachloroethylene <1.36 <1.36 3.93 <1.36 <1.36 <1.36 280 3,500
Tetrahydrofuran 2.59 4.19 2.95 3.89 50.1 2.06 14,000 180,000
Toluene 2.99 <0.753 1.14 4.11 32.8 1.23 35,000 440,000
1,2,4-Trimethylbenzene 2.02 <0.982 <0.982 2.54 13.3 <0.982 420 5,300
1,3,5-Trimethylbenzene <0.982 <0.982 <0.982 <0.982 3.57 <0.982 420 5,300
2,2,4-Trimethylpentane <0.934 <0.934 <0.934 <0.934 1 <0.934 NE NE
m&p-xylene 2.25 <1.73 <1.73 4.81 33.9 <1.73 700 8,800
o-Xylene 1.28 <0.867 <0.867 1.94 12.1 <0.867 700 8,800
Notes:
Vapor samples were collected on Apri 14, 2020.
Concentrations are reported in micrograms per cubic meter (μg/m3) unless otherwise noted.
Only compounds detected in one or more samples are shown.
Concentrations detected above the laboratory reporting limit are shown in bold.
NS - Not Sampled/Analyzed
NE - Not Established
DWM - North Carolina Department of Environmental Quality, Division of Waste Management
SGSL - DWM Sub-slab and Exterior Soil Gas Screening Level, updated February 2018.
Concentrations highlighted in yellow exceed their respective Residential SGSL.
Residential
SGSL Non-Residential SGSL
EPA Method 3C
EPA Method TO-15
Acetone