17042 1 hr Mart WP_20180614_Approval 20180620

State of North Carolina | Environmental Quality | Waste Management
1646 Mail Service Center | 217 West Jones Street | Raleigh, NC 27699-1646
919 707 8200 T

June 20, 2018

Sent Via E-mail

Christopher L. Corbitt, PG
Terracon Consultants, Inc
2701 Westport Road I Charlotte, NC 28208 [e-mail]

Subject: Work Plan Approval
Former One-Hour Martinizing Site
911 East Morehead Street Charlotte, Mecklenburg County
Brownfields Project Number 17042-13-60

Dear Mr. Corbitt,
On June 14, 2018, the Department of Environmental Quality (DEQ) Brownfields Program
received the Brownfield Assessment Work Plan dated May 3, 2018 and revised on June 14, 2018
(Work Plan) for the above referenced Brownfields Property. DEQ Brownfields reviewed this
document, and determined that comments made by DEQ Brownfields to previous versions of this
work plan have been incorporated as requested. Therefore, DEQ Brownfields approves the Work Plan.

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. Please contact Rob MacWilliams with AECOM to arrange using DSCA monitoring wells. He can be reached at 704/716-0730 or at [e-mail].
If you have questions about this correspondence or require additional information, please feel free
to contact me by phone at 704/661-0330 or by email at [e-mail].

Sincerely, Carolyn Minnich
Carolyn Minnich
Brownfields Project Manager
ec: Coppala, John [e-mail]
Franchina, Dave [e-mail]
Walker, Chris [e-mail]

BROWNFIELDS ASSESSMENT
WORK PLAN

One Hour Martinizing Brownfields Site
NCBP #17042-13-060
911 East Morehead Street
Charlotte, Mecklenburg County, North Carolina

May 3, 2018
Revised June 14, 2018
Terracon Project No. 71187043

Prepared for:
GG-Morehead, LLC
Charlotte, North Carolina

Prepared by:
Terracon Consultants, Inc.
Charlotte, North Carolina
TABLE OF CONTENTS

ii

1.0 SITE DESCRIPTION ....................................................................................................... 1
1.1 GENERAL SITE DESCRIPTION .......................................................................... 1
1.2 OFF SITE CONCERNS ....................................................................................... 1
2.0 PROPOSED ADDITIONAL ASSESSMENT .................................................................... 2
2.1 GROUNDWATER ................................................................................................ 2
2.2 SOIL .................................................................................................................... 3
2.3 SOIL VAPOR SAMPLING .................................................................................... 4
2.4 QUALITY ASSURANCE / QUALITY CONTROL .................................................. 5
2.5 BROWNFIELDS RECEPTOR SURVEY .............................................................. 5
3.0 BROWNFIELDS ASSESSMENT REPORT ..................................................................... 6

Figures

Figure 1 – Site Location Map
Figure 2 – Site Diagram and Proposed Sample Locations
Figure 3 – Site Diagram and Existing Sample Locations and Results

Table

Table 1 – Sampling and Analysis Plan

Responsive ■ Resourceful ■ Reliable 1
BROWNFIELDS ASSESSMENT WORK PLAN
ONE HOUR MARTINIZING BORWNFIELDS SITE
911 E. MOREHEAD STREET
CHARLOTTE, NORTH CAROLINA

Terracon Project No. 71187043
May 3, 2018
Revised June 14, 2018

1.0 SITE DESCRIPTION

1.1 GENERAL SITE DESCRIPTION

The One Hour Martinizing Brownfields site is located at 911 E. Morehead Street in Charlotte,
North Carolina. The site consists of a 1.623-acre parcel improved with a two-story (ground floor
and basement) commercial building, totaling 47,498 square feet (ft2). Currently, the building is
occupied by multiple tenants including a fitness gym, a restaurant, an event planning business,
a wine shop, and a nail salon. One Hour Martinizing (a dry-cleaning operation) reportedly
occupied a portion of the site as a tenant from approximately 1964 to 1969. Exterior portions of
the site consist mostly of asphalt-paved vehicle access and parking areas with limited
landscaped areas. The property is identified in Mecklenburg County tax records as Parcel No.
12520104. The site was accepted into the North Carolina Brownfields Program in December
2013 with GG-Morehead, LLC identified as the prospective developer (PD). The site location is
shown on Figure 1.

Surrounding land use consists of commercial properties to the north, east and south. The site is
bound to the west by E. Morehead Street with residential properties and a pick-up/drop-off dry
cleaning facility located across E. Morehead Street. The site generally slopes downward to the
southeast. Groundwater at the site is between 10 and 20 feet below ground surface (bgs)
based on historical reports.

1.2 OFF SITE CONCERNS

The former Domestic Laundry facility, located generally north and up-gradient of the One Hour
Martinizing Brownfields Site, is maintained within the North Carolina Dry-Cleaning Solvent
Cleanup Act (DSCA) Program, and is identified as Site No. DC600012. Various soil,
groundwater, and soil gas studies associated with the former Domestic Laundry facility have
documented impacts by volatile organic compounds (VOCs) to groundwater and soil gas media
at the former facility and surrounding properties.

Brownfields Assessment Work Plan
One Hour Martinizing Brownfields Site ■ Charlotte, NC
May 3, 2018 and Revised June 14, 2018 ■ Terracon Project No. 71187043

Responsive ■ Resourceful ■ Reliable 2
2.0 PROPOSED ADDITIONAL ASSESSMENT

It is Terracon’s understanding that the primary concern of the NC Brownfields Program is how
human health could be affected during and after redevelopment activities at the site. In order to
assess health-based risks, Terracon proposes the collection of soil, groundwater, and soil vapor
samples on the site to evaluate potential impacts from former on-site dry-cleaning operations
and to further evaluate potential impacts from off-site sources (including the former Domestic
Laundry facility). Proposed sample locations are based primarily on areas of potential concern
due to site history, potential data gaps, and discussions with the NC Brownfields Program. The
most recent IHSB Program Guidelines for Assessment and Cleanup will be used as a protocol
for additional assessment activities. The rationale for selecting specific sample
intervals/locations is discussed for the different sample media below.

2.1 GROUNDWATER

Groundwater sampling events are currently conducted by AECOM for the Domestic Laundry
site on behalf of the DSCA Program. Two on-site monitoring wells (MW-11 and MW-13) were
last sampled in May 2014 as part of DSCA groundwater monitoring activities.

As a result of the historical groundwater sampling activities that have occurred at and near the
site, Terracon proposes to sample monitoring well MW-11, located in the northern portion of the
site, and to install temporary groundwater monitoring well (TW-01) in the southern corner of the
site to evaluate the current groundwater quality conditions. Terracon also proposes to obtain
groundwater level measurements from on-site well MW-13 and off-site well MW-6 (if access to
MW-6 can be obtained) to evaluate the groundwater flow direction and hydraulic gradient at the
site. Historically, well MW-11 has been the most impacted well on the site. Well MW-13 is
located in the northwestern portion of the site and well MW-6 is located on the adjacent down-
gradient property to the east. Monitoring well locations are shown on Figure 2. The historical
groundwater data from 2013 and 2014 are depicted on Figure 3.

At the location of well TW-01, the soil boring will be advanced to the water table using a direct
push technology (DPT) drilling rig. Prior to advancing the boring, the drill tooling will be cleaned
to prevent cross-contamination of samples. Temporary 1-inch diameter PVC well casing and a
10-foot section of 1-inch diameter 20-slot PVC well screen will be inserted into the borehole.
The screened interval will be selected based on observations of recovered soil. Sand and
hydrated bentonite will be used to fill the annulus of the temporary well. Terracon will obtain a
Subsurface Investigation Permit (SIP) from Mecklenburg County prior to installing the well.

After allowing sufficient time for equilibration in wells TW-01 and MW-11, depth to groundwater
measurements will be obtained using an electronic water level meter. If depth to groundwater
conditions allow, a peristaltic pump will be used for low-flow sample collection. Purge water will
be placed into a 55-gallon drum with a “Non-Hazardous Waste” label for off-site disposal by
Brownfields Assessment Work Plan
One Hour Martinizing Brownfields Site ■ Charlotte, NC
May 3, 2018 and Revised June 14, 2018 ■ Terracon Project No. 71187043

Responsive ■ Resourceful ■ Reliable 3
Concord Industrial Services Co. (CISCO). The samples will be submitted for laboratory analysis
of volatile organic compounds (VOCs) by EPA Method 8260, semi-volatile organic compounds
(SVOCs) by EPA Method 8270, and RCRA metals by EPA Method 6020/7471. Groundwater
samples will be collected and placed in laboratory provided containers, labeled, and placed on
ice in a cooler which will be secured with a custody seal. The samples and completed chain-of-
custody forms will be transported to Pace Analytical in Huntersville, NC, a North Carolina
certified analytical laboratory on a standard analytical schedule. One trip blank (VOCs only) will
be submitted with the two groundwater samples as discussed in Section 2.4.

Prior to drilling activities, Terracon will contact NC-One Call, a public utility locating company, to
locate on-site underground utilities at the sample locations.

Groundwater analytical results will be compared to the NCAC Subchapter 2L Groundwater
Quality Standards. Additionally, constituent concentrations in groundwater will be evaluated
using the IHSB’s Residential and Non-Residential Groundwater Screening Levels for Vapor
Intrusion and the NC Brownfields Program’s Vapor Intrusion Risk Calculator under a Residential
and Non-Residential exposure scenario.

2.2 SOIL

Soil conditions have not been assessed for the site. The NCBP requested three soil samples at
the site. Two shallow soil samples (SS-01 and SS-02) will be obtained within landscaped areas
in the northwestern and northeastern portions of the site and a third soil sample (SS-03) will be
obtained from the soil boring advanced at the location of temporary well TW-01. The proposed
soil sample locations are shown on Figure 2.

Soil borings SS-01 and SS-02 will be advanced to a depth of approximately 0 to 2 feet below
ground surface using a hand auger. Soil type, relative moisture content, and other lithologic
characteristics will be documented in the field. Terracon will screen the soils in the field using a
photo-ionization detector (PID) that detects vapors from volatile organic compounds (VOCs).
Soil sample SS-03 will be screened at 5-foot intervals in the field using a PID. A soil sample will
be collected from the interval with the greatest evidence of potential impact for analysis. Soil
cuttings from soil sample SS-03 will be placed into the borehole after monitoring well TW-01 is
abandoned. Soil cuttings from surface samples SS-01 and SS-02 will be spread in the
landscaped areas of the site.

The soil samples will be placed in laboratory-prepared glass containers, labeled with pertinent
sample information and stored in an ice-packed cooler pending submittal to a North Carolina
certified laboratory for analysis of volatile organic compounds (VOCs) by EPA Method 8260,
semi-volatile organic compounds (SVOCs) by EPA Method 8270, the eight RCRA metals by
EPA Method 6020/7471 and hexavalent chromium by EPA Method 7196 in accordance with
Brownfields Assessment Work Plan
One Hour Martinizing Brownfields Site ■ Charlotte, NC
May 3, 2018 and Revised June 14, 2018 ■ Terracon Project No. 71187043

Responsive ■ Resourceful ■ Reliable 4
requirements by the NCBP. Chain of custody documentation will accompany the samples to the
laboratory.

Soil sample results will be compared to the IHSB’s Preliminary Soil Remediation Goals
(PSRGs) for unrestricted use and industrial/commercial use. Additionally, constituent
concentrations in the soils will be evaluated using the NC Brownfields Program’s Soil Risk
Calculator under a Residential and Non-Residential exposure scenario.

2.3 SOIL VAPOR SAMPLING

Soil gas studies have been completed on the site and surrounding properties to assess the
potential vapor intrusion concerns and subsurface impacts related to historical site activities on
the up-gradient properties. Since redevelopment plans for the site are currently not known,
Terracon proposes collecting two sub-slab soil vapor samples from within the on-site building to
evaluate potential vapor intrusion concerns and potential subsurface impacts until
redevelopment plans are established. Figure 2 shows the proposed sample locations.
Historical soil gas sampling data from 2012 are depicted on Figure 3.

Installation and Sampling Methodology
Technical approaches and methods outlined for the soil vapor investigation are in general
accordance with NCDEQ vapor intrusion guidance. Two sub-slab soil vapor (SV) sampling
points (SV-01 and SV-02) will be installed and sampled inside the on-site facility (Figure 2).
Each SV sampling point will be installed by drilling a 5/8-inch diameter borehole through the
floor slab using a hammer drill to approximately 1 inch into the underlying soils. The SV
sampling points will be completed with a Vapor Pin™ assembly consisting of a brass or
stainless steel barb fitting with a silicone sleeve to seal the 5/8-inch diameter hole.

Sub-slab soil vapor points will be allowed to equilibrate for a minimum of two hours after
installation. In order to test the integrity of the sampling point seal, both a shut-in test and a
helium tracer test will be conducted at each sample point. 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 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. Three volumes
of the vapor point annulus and attached Teflon® lined tubing will be purged. Purge samples will
be field-screened for helium to assess the presence of leaks in the seal and fittings and with a
photo-ionization detector to assess for VOCs. Sample collection will begin if the tracer testing
indicated helium concentrations in the vapor point are less than 10 percent of the helium
concentration in the shroud, indicating a sealed vapor point annulus.

Samples will be collected with 1.0-liter Summa® canisters equipped with 170 ml/min flow
controllers and analyzed for VOCs per EPA Method TO-15. Vacuum pressure readings will be
Brownfields Assessment Work Plan
One Hour Martinizing Brownfields Site ■ Charlotte, NC
May 3, 2018 and Revised June 14, 2018 ■ Terracon Project No. 71187043

Responsive ■ Resourceful ■ Reliable 5
collected prior to initiating sample collection, at regular intervals throughout the sampling period
and after sample collection is complete. The target vacuum pressure after sample collection will
be 5 mmHg. Technical approaches and methods outlined above are in general accordance with
the Interstate Technical and Regulatory Council’s Vapor Intrusion: A Practical Guideline (2007)
and DWMs Vapor Intrusion Guidance (March 2018).

Following completion of the field activities, the Summa canisters, along with chain-of-custody
documentation, will be shipped to Contest, Inc. in East Longmeadow, Massachusetts for
laboratory analysis of volatile organic compounds (VOCs) by EPA Method TO-15. Terracon will
request the laboratory record the vacuum pressure of the canisters when they are received and
include the readings in the laboratory analytical report.

Soil vapor sample results will be compared to the IHSB’s Residential and Non-Residential Sub-
slab Soil Gas Screening Levels. Additionally, constituent concentrations will be evaluated using
the NC Brownfields Program’s Vapor Intrusion Risk Calculator under a Residential and Non-
Residential exposure scenario.

2.4 QUALITY ASSURANCE / QUALITY CONTROL

Blind duplicate samples will be collected as part of this investigation for Quality Assurance /
Quality Control (QA/QC) purposes. Specifically, one duplicate sample will be collected per
sample media (soil, groundwater, and soil gas), for a total of three duplicate samples. The soil
and groundwater duplicate samples will be submitted for laboratory analysis of VOCs by EPA
Method 8260, SVOCs by EPA Method 8270, and RCRA metals by EPA Method 6020/7471. The
sub-slab duplicate sample will be submitted to the analytical laboratory for analysis of VOCs by
EPA Method TO-15.

In addition to the duplicate samples, one trip blank will be submitted with the groundwater
samples. A level 2 QA/QC data package will be requested from the analytical laboratories for
soil, groundwater, and air samples. Terracon will also request “J-Flag” values to be included in
the laboratory analytical reports.

2.5 BROWNFIELDS RECEPTOR SURVEY

A Brownfields Receptor Survey will be completed as part of the additional assessment for the
site. The “Brownfields Property Receptor Survey” form will be used to conduct the field and
office-based portions of the receptor survey. The completed form and a summary of findings will
be included in the Brownfields Assessment Report.

Brownfields Assessment Work Plan
One Hour Martinizing Brownfields Site ■ Charlotte, NC
May 3, 2018 and Revised June 14, 2018 ■ Terracon Project No. 71187043

Responsive ■ Resourceful ■ Reliable 6
3.0 BROWNFIELDS ASSESSMENT REPORT

Upon completion of the above assessment activities and receipt of the laboratory analytical
results, a Brownfields Assessment Report will be prepared that will include the following items:

 Documentation of field activities;
 Site plan showing pertinent site features;
 Soil boring logs and groundwater and air sampling logs;
 Estimation of groundwater flow direction based on field measurements;
 Receptor survey form and results;
 Analytical laboratory results;
 Data evaluation and presentation of findings including comparison of data to applicable
regulatory standards; and
 Recommendations concerning further assessment, 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.

Figures

SITE LOCATION MAP
One Hour Martinizing Brownfields
(NCBP # 17042-13-060)
911 E. Morehead Street
Charlotte, Mecklenburg County, NC
TOPOGRAPHIC MAP IMAGE COURTESY OF THE U.S. GEOLOGICAL SURVEY
QUADRANGLES INCLUDE: CHARLOTTE EAST, NC (1/1/1988).
2701 Westport Rd
Charlotte, NC 28208-3608
71187043
Project Manager:
Drawn by:
Checked by:
Approved by:
HEH
CLC
CLC
1”=2,000’
71187043.1
April 2018
Project No.
Scale:
File Name:
Date: 1
Figure HEH
APPROXIMATE
SITE BOUNDARY
71187043
Site Diagram and Proposed Sample Locations
One-Hour Martinizing Brownfields Site
(NCBP # 17042-13-060)
911 E. Morehead Street
Charlotte, Mecklenburg County, NC
2701 Westport Road
Charlotte, NC
71187043
HEH
CLC
CLC
N.T.S.
April 2018
Scale:
2
FigureProject Manager:
Drawn by:
Checked by:
Approved by:
Project No.
File Name:
Date:
HEH
denotes approximate site boundary
Proposed location of a temporary
monitoring well and soil sample
approximate location of existing
groundwater monitoring well
Proposed sub-slab soil gas sample
location
MW-11
SV-01
SS-01
LEGEND:
TW-01/SS-03
SS-02
SV-02
Proposed soil sample location
MW-13
MW-6
3
FIGURE
2701 Westport Road
Charlotte, NC
Site Diagram and Existing Sample
Locations and Results
Project Manager:
Drawn by:
Checked by:
Approved by:
HEH Project No.
File Name:
Date:
Scale:
71187043
HEH
April 2018CLC
CLC
Not to Scale
71187043
One-Hour Martinizing Brownfields Site
(NCBP # 17042-13-060)
911 E. Morehead Street
Charlotte, Mecklenburg County, NC
MW-13 (5/20/2014)2
PCE: <0.001 µg/L
cis-1,2 DCE: <0.001µg/L
8/03/20131
Chloroform: 21 µg/L
MW-11 (5/20/2014)2
PCE: 49.7 µg/L
TCE: 12.6 µg/L 12.6
cis-1,2 DCE: 26.8 µg/L
trans-1,2 DCE: <0.001 µg/L
Vinyl Chloride: <0.001 µg/L
8/03/20131
Chloroform: 6.6 µg/L
Cis-1,2-Dichloroethene: 33 µg/L
Naphthalene: 0.033J µg/L
PCE: 55 µg/L
Trans-1,2-Dichloroethene: 0.57J µg/L
TCE: 18 µg/L
**SG-1 (2-11-2012)3
PCE: 5.1 µg/m3
TCE: 14.5 µg/m3
NOTES:1 Groundwater analytical data is from a Limited Well Sampling Report for 911 East Morehead Street, report dated October 14, 2013. 2 Groundwater analytical data is from an Updated Groundwater Monitoring Report Submittal for the Former Domestic Laundry DSCA Site ID #60-0012, report dated August 27, 2014. Only the most recent sampling data is presented. 3 Soil gas analytical results are from a Risk-Based Corrective Action Report for the Former Domestic Laundry Site, report dated September 25, 2015.DIAGRAM IS FOR GENERAL LOCATION ONLY, AND IS NOT INTENDED FOR CONSTRUCTION PURPOSES
**SG-5 (2-11-2012)3
BDL
**SG-3 (2-11-2012)3
PCE: 1.8 µg/m3
**SG-4 (2-11-2012)3
PCE: 12 µg/m3
**SG-8 (2-11-2012)3
PCE: 6.4 µg/m3
TCE: 0.59 µg/m3
**SG-4 (2-11-2012)3
PCE: 3,100 µg/m3
approximate location of a soil gas sampling location
LEGEND:
approximate location of existing groundwater monitoring well
denotes approximate site boundary

Table

Table 1
Sampling and Analysis Plan
One Hour Martinizing Brownfields Site
911 E. Morehead Street
Charlotte, Mecklenburg County, NC
Terracon Project No. 71187043
SAMPLE ID SAMPLE MEDIUM GENERAL AREA SAMPLE INTERVAL (ft bgs)ANALYTICAL METHODS
MW-6 Groundwater Northeast of On-Site Building 12-25*No Sample Collection - Water Level Measurement
MW-11 Groundwater North of On-Site Building 17-25*EPA 8260 (VOCs); EPA 8270 (SVOCs); 6020/7471 (RCRA Metals)
MW-13 Groundwater Northwest of On-Site Building 13-25*No Sample Collection - Water Level Measurement
TW-01 Groundwater Southern Corner of Property 15-25*EPA 8260 (VOCs); EPA 8270 (SVOCs); 6020/7471 (RCRA Metals)
SS-01 Soil Northwest Parking Area 0-2 EPA 8260 (VOCs); EPA 8270 (SVOCs); 6020/7471 (RCRA Metals); EPA Method 7196 (Hex. Chrome)
SS-02 Soil Northeast Parking Area 0-2 EPA 8260 (VOCs); EPA 8270 (SVOCs); 6020/7471 (RCRA Metals); EPA Method 7196 (Hex. Chrome)
SS-03 Soil Southern Corner of Property Highest PID Reading EPA 8260 (VOCs); EPA 8270 (SVOCs); 6020/7471 (RCRA Metals); EPA Method 7196 (Hex. Chrome)
SV-01 Sub-Slab Soil Vapor (Gas)Northern Corner of On-Site Building Sub-Slab EPA TO-15
SV-02 Sub-Slab Soil Vapor (Gas)Southern Corner of On-Site Building Sub-Slab EPA TO-15
Notes:
N/A - Not Applicable * Depth to groundwater ranged between ft bgs based on historical data from the former adjacent dry-cleaner.
ft bgs - feet below ground surface