05016_Southern Mfg PSA Rpt_Mecklenburg County Garage_Parcel 40

Preliminary Site Assessment
Mecklenburg County Maintenance
Garage-Parcel 40

900 West 12th Street
Charlotte
Mecklenburg County, North Carolina

H&H Job No. ROW-413
State Project P-5002
WBS Element #51800.1.STR03T1B
April 22, 2013

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Preliminary Site Assessment Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Project ROW-413 Table of Contents

Section Page No.
1.0 Introduction and Background .............................................................................................. 1
2.0 Soil Assessment....................................................................................................................... 5
2.1 Soil Sampling ....................................................................................................................... 5
2.2 Soil Analytical Results ......................................................................................................... 8
3.0 Groundwater Assessment .................................................................................................... 13
3.1 Temporary Monitoring Well Sampling .............................................................................. 13
3.2 Groundwater Analytical Results ......................................................................................... 14
4.0 Investigative Derived Waste................................................................................................ 15
5.0 Summary and Regulatory Considerations ........................................................................ 15
6.0 Signature Page ...................................................................................................................... 17

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List of Tables
Table 1 Soil Boring GPS Coordinate Data
Table 2 Summary of Asbestos Soil Analytical Results
Table 3 Summary of Soil Analytical Results
Table 4 Summary of Groundwater Analytical Results
List of Figures
Figure 1 Site Location Map
Figure 2 Site Map
Figure 3A Soil Asbestos Analytical Results Map (PG 1 of 3)
Figure 3B Soil Asbestos Analytical Results Map (PG 2 of 3)
Figure 3C Soil Asbestos Analytical Results Map (PG 3 of 3)
Figure 4 Soil PCB Analytical Results Map
Figure 5 Soil Pesticide/VOCs Analytical Results Map
Figure 6 Soil TPH DRO and GRO Analytical Results Map
Figure 7 Soil TPH DRO/GRO/VOCs Analytical Results Map
Figure 8 Groundwater Analytical Results Map

List of Appendices Appendix A NC DOT Preliminary Plan
Appendix B DENR Incident Files
Appendix C GEL Engineering of NC, Inc. Geophysical Survey Report
Appendix D Soil Boring Logs
Appendix E Laboratory Analytical Reports
Appendix F Subsurface Investigation Permit
Appendix G Groundwater Sampling Form
Appendix H Well Abandonment Record
Appendix I Non-Hazardous Materials Manifests

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Preliminary Site Assessment Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Project ROW-413
1.0 Introduction and Background

Hart & Hickman, PC (H&H) has prepared this Preliminary Site Assessment (PSA) report
documenting assessment activities performed at the Mecklenburg County Maintenance Garage
property (Parcel 40) located at 900 West 12th Street in Charlotte, Mecklenburg County,
North Carolina. This assessment was conducted for the North Carolina Department of
Transportation (NC DOT) in accordance with H&H’s January 16, 2013 proposal.

The purpose of this assessment was to collect data and evaluate the presence or absence of impacted
soil in the proposed right-of-way and construction areas related to the proposed Maxwell Court
extension for the Charlotte Railroad Improvement and Safety Project (CRISP) (State Project
P-5002). The Mecklenburg County Maintenance Garage (MCG) property currently operates as an
auto repair maintenance facility. A site location map is included as Figure 1, and a site map is
provided as Figure 2. The NC DOT preliminary plan of the Maxwell Court extension area near the
MCG property is attached as Appendix A.

NC DOT plans indicate that a portion of the maintenance facility building and the adjacent
vector (pest) control storage building will be demolished prior to road construction activities.
Subgrade hydraulic lifts and a floor trench drain were identified by NC DOT and H&H inside the
maintenance facility within the proposed DOT work areas. An outside equipment wash pad with
a sump containing oily water is also present within the proposed DOT work area. The vector
control building is used for pesticide storage. An existing oil-water separator (OWS) and
petroleum UST systems are located outside of DOT proposed work areas and will not be
removed as part of demolition activities. Therefore, the OWS and petroleum UST systems were
not assessed as part of this scope of work.
The former Southern Manufacturing property (located adjacent to the proposed road extension
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and maintenance garage) is currently occupied by the NC Music Factory. The NC Music
Factory occupies the former Southern Manufacturing building where asbestos fibers were used in
their manufacturing process. Dust and waste materials containing asbestos were generated
during the manufacturing of flame resistant textiles, floor tiles, etc. Previous assessment
activities indicate that soil is impacted with asbestos (up to 12 ft below grade) on the former
Southern Manufacturing property which extends to the area beneath the proposed Maxwell Court
extension. The NC Music Factory site is a Brownfields site. With the exception of the northeast
corner of the NC Music Factory property, the area covered by the Brownfields Agreement does
not extend below the Maxwell Court Extension project.

H&H reviewed incident files for the Southern Manufacturing property at the North Carolina
Department of Environment and Natural Resources (DENR) Raleigh Central Office to better find
locations of previously reported impacts. In addition, H&H reviewed underground storage tank
(UST) incident files for the MCG property at the DENR Mooresville Regional Office to better
target UST system areas and to find locations of previously reported petroleum impacts.
Historical environmental assessment information is discussed below.

Former Southern Manufacturing Property
Several environmental assessments have been conducted on the former Southern Manufacturing
property. According to Mecklenburg County Department of Environmental Protection
Memorandum dated June 22, 1988, asbestos impacted soils were identified in six soil borings
advanced at the site. Asbestos impacted soil was identified up to 12.5 ft below ground surface
(bgs). The soil borings appear to have been advanced in the parking area to the west of the
maintenance garage on the MCG property. According to Rust Environment and Infrastructure
(REI) Phase II Environmental Site Assessment (ESA) dated May 1998, low level concentrations
of volatile organic compounds (VOCs) and semi-VOCs (SVOCs) were detected in groundwater
samples collected at the Southern Manufacturing site. Tetrachloroethylene (PCE) was detected
above the 15A NCAC 2L .0202 Groundwater Quality Standard (2L Standard) in one
groundwater sample collected from the eastern portion of the Southern Manufacturing site. Low
level concentrations of total petroleum hydrocarbons (TPH) as diesel range organics (DRO) were
detected in soil samples collected in three locations on the property including a drum storage
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area in the northeast corner of the property. The ESA report also indicates that asbestos
containing waste was previously disposed in the northern portion of the site.

The RMT, Inc Site Assessment Plan (SAP) dated April 2000 provides a summary of
environmental investigation and regulatory involvement at the Southern Manufacturing site
through 1998. The SAP also includes a summary of REI Phase II ESA activities from 1998.
According to RMT, Inc. Site Assessment Report dated August 2000, additional assessment
activities were conducted on the Southern Manufacturing property to evaluate asbestos impacts
and the presence of volatile organic compounds previously detected in groundwater. Asbestos
impacts were identified in shallow soils throughout the property. A concentration of 1,1-
dichloroethane was detected in groundwater below the 2L Standard in the eastern portion of the
property.

Mecklenburg County Maintenance Garage Property
According to Matrix Environmental Technologies, Inc. Tank Closure Assessment Report dated
September 23, 1994, one 10,000-gallon diesel UST and three 10,000-gallon gasoline USTs were
removed from the MCG property in August 1994. Concentrations of TPH as gasoline range
organics (GRO) were detected in several samples collected beneath the USTs above DENR
target screening levels. Approximately 840 tons of impacted soil was excavated and removed
from the tank basin and properly disposed off site. The USTs were located on the southern side
of the maintenance facility outside of proposed NC DOT work areas.

According to Mecklenburg County Department of Environmental Protection Site Assessment
Report dated November 14, 1995, assessment activities, including the installation of eight soil
borings, five Type II shallow monitoring wells, and one Type III monitoring, were conducted
near the removed USTs mentioned above (Incident Number 14170). Petroleum constituents
were detected in soil and groundwater samples collected during the assessment activities above
DENR target screening levels. The soil boring and monitoring wells were installed on the
southern side of the maintenance facility outside of proposed NC DOT work areas. The soil and
groundwater impacts do not appear to extend into proposed NC DOT work areas.

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According to the Terraine, Inc. Underground Storage Tank Closure Report dated February 1997,
one 6,000-gallon mosquito larvicide (98.2 % petroleum distillate) UST was removed from the
MCG property in January 1997. The UST was located near the northwest corner of the vector
control building outside of proposed NC DOT work areas near the proposed construction
easement line. Analytical results of soil samples collected beneath the UST indicate that there
were no concentrations of petroleum constituents above the laboratory method detection limits.
Based on the UST closure analytical results, DENR issued a no further action (NFA) status for
the 6,000-gallon mosquito larvicide UST on March 6, 1997.

According to the Geological and Environmental Services letter dated May 4, 2009, one
8,000-gallon motor oil UST and one 6,000-gallon anti-freeze UST were removed from the MCG
property in March 2009 (Incident Number 36669). The USTs were located near the center of the
northern side of the maintenance facility outside of proposed NC DOT work areas near the
proposed construction easement line. Low level concentrations of ethylene glycol were detected
in two soil samples collected beneath the 6,000-gallon anti-freeze UST below DENR target
screening levels. A low level concentration of TPH DRO was detected in one sample collected
beneath the 8,000-gallon motor oil UST. No target constituents were detected in subsequent
risk-based analyses of an additional soil sample collected at this location. DENR issued a NFA
status for this incident on May 22, 2009.

According to the DENR Registered UST Database, two 1,000-gallon used oil USTs and one
8,000-gallon motor oil UST were removed from the site in 1990. No DENR files were available
for review for these removed USTs. The database also indicates that one 1,000-gallon used oil
UST and four 10,000-gallon gasoline USTs are currently in use on the MCG property. These
USTs are believed to be located outside of proposed NC DOT work areas.

According to the S&ME, Inc. Report of Subsurface Asbestos Investigation dated September 6, 2005,
21 soil borings were advanced in the parking areas in the western portion of the MCG property to
investigate the potential for asbestos impacts in soil. The parking areas are located to the north and
east of the former Southern Manufacturing property. Analytical results of soil samples collected by
S&ME indicate the presence of asbestos impacted soil up to 12 ft bgs in multiple borings advanced
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in each parking area. These asbestos impacted soil areas are located within proposed NC DOT
work areas. The S&ME analytical results are included on Figure 3A. Pertinent information from
the assessment reports mentioned above and copies of the NFA letters are included in Appendix B.

According to City of Charlotte personnel, polychlorinated biphenyls (PCBs) were reportedly
discharged in the streambed near a Duke Energy substation located to the east of the proposed
Maxwell Court Extension. The PCB impacts were reportedly cleaned up by Duke Energy.
Based on a discussion between H&H and Mr. Sam Whitley of Duke Energy, Mr. Whitley stated
that he was not aware of the reported PCB impacts. In addition, no DENR files associated with
the PCB impacts were available for review. The City has restored the stream, but it is not known
if the streambed was tested for PCBs downstream near the proposed road construction area. In
addition, historical Southern Manufacturing reports indicate that a C&D Landfill may have been
located near the northwest end of the proposed road extension.

The PSA activities recently conducted by H&H in the NC DOT proposed right-of-way and
construction easement areas on the MCG property are discussed below.

2.0 Soil Assessment
2.1 Soil Sampling

H&H mobilized to the MCG property on February 14 through February 20, 2013 and advanced 47
soil borings (MCG-1 through MCG-47) by hand auger and direct push technology (DPT). Prior to
advancing the soil borings, H&H reviewed the results of a geophysical survey performed at the site
by GEL Engineering of NC, Inc. (GEL) in February 2013. GEL utilized electromagnetic (EM)
induction technology and ground penetrating radar (GPR) to identify potential geophysical
anomalies and potential USTs at the site. Please note that due to subsurface soil conditions, the
GPR signal penetration was limited to approximately 2.5 ft bgs.

The EM/GPR results indicated the presence of several anomalies within proposed NC DOT work
areas. The anomalies were attributed to known metallic surface objects that were not characteristic
of typical UST signatures. One anomaly was identified as buried metallic debris. Based on the
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GEL EM and GPR results, no potential USTs were identified in the survey area. GEL’s report,
including a site map depicting the results of the EM and GPR survey is provided in Appendix C.
GEL’s report also includes the geophysical survey results from a separate investigation for NC
DOT. During PSA activities, one existing monitoring well was identified in the parking area to the
north of the vector control building. The well location is shown on Figure 3B.

Prior to conducting soil borings, utilities were marked by NC One Call and GEL. Borings were
also cleared to a five foot depth by hand auger. H&H utilized Probe Technology, Inc. (PTI) of
Concord, North Carolina to advance the soil borings. The soil borings were advanced to various
depths ranging from 1 ft to 12 ft bgs.

To facilitate the selection of soil samples for laboratory analysis, soil from each boring was
screened continuously for the presence of VOCs with an organic vapor analyzer (OVA).
Additionally, H&H observed the soil for visual and olfactory indications of petroleum impacts.
During soil screening, with the exception of boring MCG-34 there were no obvious indications
of impacts in soil borings advanced at the site. There were indications of potential impacts in
boring MCG-34 (10 ft to 12 ft). There were potential indications of impacts between the surface
and 3 ft in boring MCG-4 and between 6 ft and 12 ft in boring MCG-30. Soil samples were
collected at depths ranging from 0 to 1 ft bgs to 10 ft to 12 ft bgs. Soil boring logs are included
in Appendix D.

Soil borings MCG-1 and MCG-2 were advanced near the reported former C&D landfill area.
Soil borings MCG-3 through MCG-13, MCG-17, MCG-19, MCG-20, MCG-22 through MCG-
24, MCG-27, MCG-38 through MCG-40, and MCG-41 through MCG-46 were advanced along
the proposed Maxwell Court extension and proposed drainage features. Soil borings MCG-14
through MCG-16, MCG-21 and MCG-47 were advanced in the streambed in the center of the
property. Soil boring MCG-18 was advanced near the wash pad area and soil borings MCG-25
through MCG-33 were advanced near the maintenance garage hydraulic lifts and trench drain.
Soil borings MCG-34 through MCG-37 were advanced near the vector control building. GPS
coordinate data for each soil boring is summarized in Table 1. Soil boring locations are shown
on Figures 3A through 3C and Figures 4 through 7.
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After sample collection, the soil samples were placed into laboratory supplied sample containers
using nitrile glove-covered hands. The containers were then labeled as to content, analyses
requested, sample date and time, and sampler’s name. The samples were placed in an iced
cooler upon collection and were subsequently submitted to Pace Analytical Services, Inc. under
standard chain-of-custody protocol. Soil samples collected for asbestos analysis were placed
into Ziploc baggies upon collection and were subsequently submitted to EMSL Analytical, Inc.
for laboratory analysis.

Up to two soil samples (shallow and deeper) collected from borings advanced near the reported
C&D landfill area, along the proposed Maxwell Court extension and proposed drainage features,
and in the streambed in the center of the property were analyzed for asbestos containing material
(ACM) using EPA Method 600/R-93/116. The laboratory reported whether soil samples were
positive for asbestos using Polarized Light Microscopy (PLM) methods. Sample depths and
asbestos analytical results are summarized in Table 2.

Shallow samples collected from borings MCG-14, MCG-15, MCG-21, and MCG-47 in the
streambed were submitted for analysis of PCBs by EPA Method 8082. Soil samples collected from
borings MCG-34 through MCG-37 advanced near the vector control building were analyzed for
organochlorine pesticides and organophosphorous pesticides using EPA Methods 8081 and 8141,
and for VOCs using EPA Method 8260.

Soil samples collected from borings MCG-1 and MCG-2 collected near the former C&D landfill
area were also submitted for analysis of TPH DRO and GRO by EPA Method 8015. Due to
elevated OVA readings, the shallow sample collected from MCG-4 was analyzed for TPH DRO
and GRO. Shallow soil samples collected from borings MCG-38 through MCG-40 were analyzed
for TPH DRO and GRO to delineate potential impacts in MCG-4. The soil sample collected from
soil boring MCG-20 advanced near the former 8,000-gallon motor oil UST and 6,000-gallon anti-
freeze UST was also analyzed or TPH DRO and GRO. The soil sample collected from soil boring
MCG-18 advanced near the wash pad was analyzed for TPH DRO and GRO and for VOCs. Soil
samples collected from borings MCG-25 through MCG-31 and MCG-33 advanced near the
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hydraulic lifts in the maintenance building were analyzed for TPR DRO. The soil sample collected
from boring MCG-32 advanced near the trench drain in the maintenance garage was analyzed for
TPH DRO and GRO and for VOCs. Sample depths and analytical results are summarized in
Table 3. Laboratory analytical data sheets for the MCG property soil samples and chain-of-custody
documentation are provided in Appendix E. The analytical results are discussed below.
2.2 Soil Analytical Results
Laboratory analytical results indicate the presence of chrysotile asbestos in 10 soil borings advanced
in the project area. Chrysotile asbestos was detected in borings MCG-14 (0 to 1 ft), MCG-15 (0 to
1 ft), and MCG-47 (0 to 1ft) collected in the streambed. Chrysotile asbestos was detected in borings
MCG-3 (0 to 1ft), MCG-4 (4 to 6 ft), MCG-9 (0 to 1 ft) and (4 to 6 ft), MCG-10 (4 to 6 ft), MCG-
12 (0 to 1 ft), MCG-13 (0 to 1 ft) and (2 to 4 ft), and MCG-45 (4 to 6 ft) collected along the
proposed Maxwell Court extension. ACM was detected in MCG-45 (4 to 6 ft) which is in a
separate area (near the entrance to Maxwell Court) compared to the other ACM detections. Because
ACM was detected in boring MCG-45, H&H instructed the laboratory to analyze MCG-45 (4 to
6 ft) using Transmission Electron Microscopy (TEM) Method which is a more sophisticated method
than PLM. Utilizing TEM, the laboratory confirmed the presence of trace levels of chrysotile
asbestos (less than 0.1%) in MCG-45.

A low level concentration of PCB aroclor 1254 (0.531 mg/kg) was detected in the shallow soil
sample collected from boring MCG-15 (0 to 1 ft) below the IHSB Health-Based Soil Remediation
Goal (SRG) and above the IHSB Protection of Groundwater (POG) SRG for total PCBs. No other
concentrations of PCBs were detected in samples MCG 14, MCG-21, and MCG-47 collected in the
streambed.

Low level concentrations of pesticides and/or VOCs were detected in four soil samples collected
near the vector control building. A concentration of heptachlor (0.0032 mg/kg) which is below the
SRGs was detected in soil sample MCG-34 (10 ft to 12 ft). 4,4’-DDE (0.0028 mg/kg) and 4,4’-
DDT (0.0057 mg/kg) were detected in soil sample MCG-36 (0 to 1 ft). The DDE and DDT
concentrations are below the SRGs. Concentrations of VOCs including n-butylbenzene, sec-
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butlybenzene, isopropylbenzene, p-isopropyltoluene, n-propylbenzene, 1,2,4-trimethylbenzene, and
1,3,5-trimethylbenzene were detected in soil sample MCG-34 (10 ft to 12 ft ). These VOC
concentrations are below the SRGs. Naphthalene (1.23 mg/kg) detected in MCG-34 (10 ft to 12 ft)
was below the Health-based SRG and above the POGSRG. Concentrations of acetone were
detected in the shallow soil samples (0 to 1 ft) collected from borings MCG-34 through MCG-36
below the SRGs. Acetone is a common laboratory contaminant and is not likely associated with a
release at the site. No pesticides or VOCs were detected above the laboratory method detection
limit in the shallow sample collected from boring MCG-37.

TPH DRO (54.7 mg/kg and 36.4 mg/kg) were detected above the DENR Action Level (10 mg/kg)
in soil samples MCG-1 (4 ft to 6 ft) and MCG-2 (4 ft to 6 ft) collected near the former C&D
landfill. Concentrations of TPH DRO (up to 295 mg/kg) above the DENR Action Level were
detected in soil samples MCG-4 (0.5 ft to 1 ft), MCG-38 (1 ft to 2 ft), and MCG-39 (1 ft to 2 ft)
collected in the western parking area on the MCG property. TPH GRO (12.5 mg/kg) was also
detected in MCG-4 above the DENR Action Level. TPH DRO (7.3 mg/kg) below the DENR
Action Level was detected in soil sample MCG-40 (1 ft to 2 ft). Sample MCG-40 was also collected
in the western parking area.

A low level concentration of TPH DRO (8.1 mg/kg) below the DENR Action Level was detected in
soil sample MCG-18 (2 ft to 4 ft) collected near the wash pad. A low level concentration of
methylene chloride below the SRGs was also detected in MCG-18 (2 ft to 4 ft). Methylene chloride
is also a common laboratory contaminant and is not likely associated with a release at the site. A
concentration of TPH DRO (122 mg/kg) above the DENR Action Level was detected in soil sample
MCG-30 (6 ft to 8 ft) collected near a hydraulic lift inside the maintenance facility. No other
constituents were reported above laboratory method detection limits.

Based on PSA analytical results and previous assessment activities conducted by S&ME on the
MCG property, widespread asbestos impacted soils are located beneath the western portion of the
property between Hamilton Street to the west and the wash pad area to the east. The asbestos
impacted soils extend beyond the construction easement line to the north and onto the NC Music
Factory property (Parcel 1) to the south. Asbestos impacted soils are also located near the northeast
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corner of Maxwell Court and NC Music Factory Boulevard. Asbestos impacted soils may extend
into the Duke Energy property (Parcel 2) in this area. Based on laboratory analytical results,
asbestos impacted soils are present in two locations on the MCG property within the proposed NC
DOT work areas.

• H&H estimates that there are roughly 45,000 cubic yards (67,500 tons) of impacted soil
between the surface and 12 ft in the western portion of the MCG property within proposed
NC DOT work areas.
• There are roughly 1,000 cubic yards (1,500 tons) of impacted soil between 2 and 8 ft near
the corner of Maxwell Court and NC Music Factory Boulevard near boring MCG-45.

The estimated depth of asbestos impacted soils is based on the low level laboratory results. Impacts
may extend beyond the depths indicated above. The approximate areas of asbestos impacted soil are
shown on Figures 3A through 3C.

PCB impacted soils are located near the surface in the streambed near the center of the MCG
property. Based on laboratory analytical results, PCB impacted soils are present in one location on
the MCG property within the proposed NC DOT work areas.

• H&H estimates that there are roughly 150 cubic yards (225 tons) of impacted soil between
the surface and 2 ft in the streambed area within the proposed piping trench near soil boring
MCG-15.

The estimated depth of impacted soils is based on the low level laboratory result and low mobility
of PCBs. PCB impacted soil may extend beyond 2 ft in this area. Additional delineation of
impacted soil would be required to better define PCB impacts at the site. Asbestos impacted soils
are also present in this location. The approximate area PCB of impacted soil is shown on Figure 4.

Low level pesticide and VOCs impacted soil are located near the vector control building in the
eastern portion of the MCG property within proposed NC DOT work areas.

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• H&H estimates that there are roughly 180 cubic yards (270 tons) of impacted soil between
10 ft and 12 ft near the northwest side of the vector control building near soil boring MCG-
34 and between the surface and 2 ft inside the southern portion of the vector control building
near soil boring MCG-36.

The estimated depth of impacted soils is based on laboratory analytical data and field screening
results. Based on field screening, impacts may extend beyond 12 ft near boring MCG-34. Field
screening did not provide information that defines the impacted soil interval in boring MCG-36.
Therefore, impacts may extend beyond 2 ft in this area. Although the pesticide impacts are below
target screening levels, these soils should also be managed as impacted if they are disturbed or
excavated by site work. The approximate area of impacted soil is shown on Figure 5.

TPH DRO and/or GRO impacted soils are located near Hamilton Street (near the former C&D
landfill area) and in the parking area in the western portion of the property. Based on laboratory
analytical results and OVA readings, petroleum impacted soils are present in two locations in the
western portion of the MCG property within the proposed NC DOT work areas.

• H&H estimates that there are roughly 900 cubic yards (1,400 tons) of impacted soil between
the surface and 8 ft near Hamilton Street based on borings MCG-1 and MCG-2.
• There are roughly 700 cubic yards (1,000 tons) of impacted soil between the surface and 3 ft
beneath the parking area near borings MCG-4, MCG-38 and MCG-39.
• There are roughly 200 cubic yards (300 tons) of impacted soil below the DENR Action
Level between the surface and 3 ft beneath parking area near boring MCG-40.

The estimated depth of petroleum impacted soils is based on field screening results. However, field
screening did not provide information that defines the impacted soil interval in all boring locations.
Therefore, impacts may extend beyond the depths indicated above. Although the TPH DRO impacts
are below the Action Level near boring MCG-40, these soils should also be managed as impacted if
they are disturbed or excavated by site work. Asbestos impacted soils are also present in these
locations. The approximate areas of TPH impacted soil in the western portion of the site are shown
on Figure 6.
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Large quantities of fill are located on the MCG parcel. Potential C&D landfilled materials (wood,
brick, concrete, etc.) were detected in borings advanced in the western portion of the site.

TPH DRO impacted soils are also located near the wash pad at the center of the MCG property and
near a hydraulic lift inside the maintenance building. These impacted areas are located within the
proposed NC DOT work areas.

 H&H estimates that there are roughly 200 cubic yards (300 tons) of impacted soil below the
DENR Action Level between the surface and 6 ft beneath the wash pad near soil boring
MCG-18.
 There are roughly 100 cubic yards (150 tons) of impacted soil between 4 ft and 12 ft in the
maintenance garage near boring MCG-30.

The estimated depth of petroleum impacted soils is based on laboratory analytical data and field
screening results. However, field screening did not provide information that defines the impacted
soil interval in all boring locations. Therefore, impacts may extend beyond the depths indicated
above. Although the TPH DRO impacts are below the Action Level near boring MCG-18, these
soils should also be managed as impacted if they are disturbed or excavated by site work. Asbestos
impacted soils are also present near MCG-18. The approximate areas of TPH impacted soil near the
MCG building are shown on Figure 7.

NC DOT plans indicate proposed cut areas for drainage piping installations and road
construction activities for the proposed extension of Maxwell Court. Based on NC DOT cut
volume estimates and the impacted soil areas described above, NC DOT anticipates the
following quantities of impacted soil will need to be excavated for construction activities:

 Mecklenburg County Maintenance Garage (Parcel 40) will require excavation of
approximately 1,050 cubic yards of asbestos impacted soil which includes approximately
41.9 cubic yards of TPH impacted soil and approximately 124 cubic yards of PCB
impacted soil in the streambed area. Approximately one cubic yard (or more) of TPH
impacted soil will require excavation near a hydraulic lift in the maintenance building.
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 NC Music Factory (Parcel 1) will require excavation of approximately 23.1 cubic yards
of asbestos impacted soil.

 Duke Energy (Parcel 2) will require excavation of approximately 351 cubic yards of
asbestos impacted soil.

3.0 Groundwater Assessment

3.1 Temporary Monitoring Well Sampling
Because previous assessment activities indicate that groundwater is impacted with chlorinated
solvents and petroleum constituents on the adjacent Southern Manufacturing property one
temporary monitoring well (TMW-1 MCG) was installed along the proposed piping near the
streambed near the center of the MCG property. The monitoring well location is shown on
Figure 8.

Prior to conducting the well installation, a Subsurface Investigation Permit (SIP) was obtained
for the temporary well as required by Mecklenburg County. The one-inch diameter well was
installed by PTI using the DPT drilling rig. The temporary monitoring well was installed to
bracket the water table with 10 feet of 0.010-inch slotted screen and a total depth of 15 ft bgs.
The annulus around the well screen was filled with sand to approximately two ft above the well
screen. The annulus around the well casing above the sand was filled with approximately two ft
of hydrated bentonite. The temporary well boring log is included in Appendix D. The SIP is
included in Appendix F.

Upon completion of the monitoring well installation, H&H developed the well using a bailer to
remove residual fines. Once development was complete and the water table equilibrated, H&H
measured depth to water using an electronic meter. The depth to water was measured at
8.31 ft bgs in TMW-1 MCG. The elevation of the top of well casing was not measured. The
well was then purged by low flow purging techniques using a peristaltic pump. Purging of the
well was conducted until field measurements of pH, specific conductivity, oxidation reduction
14
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potential (ORP), and temperature stabilized. The groundwater sampling form is included in
Appendix G.

After purging, a groundwater sample was collected. The groundwater sample was collected using
nitrile glove-covered hands at the outflow tubing of the peristaltic pump and placed into laboratory-
supplied sample containers for analysis of VOCs using EPA Method 8260 and for SVOCs using
EPA Method 8270. For VOC analysis, the groundwater sample was purged and trapped prior to the
pump head, and then poured into the sample containers. The containers were then labeled as to
content, analyses requested, sample date and time, and sampler’s name. The samples were placed
in an iced cooler upon collection and were subsequently submitted to Pace Analytical Services, Inc.
under standard chain-of-custody protocol. Analytical results are summarized in Table 4.
Laboratory analytical data sheets for the MCG property groundwater sample and chain-of-custody
documentation are provided in Appendix E.

After completion of groundwater sampling activities, temporary monitoring well TMW-1 MCG
was properly abandoned in accordance with DENR regulations by PTI. The well abandonment
record was provided to Mecklenburg County to close out the SIP. The well abandonment record
is included in Appendix H.

3.2 Groundwater Analytical Results
A concentration of methyl-tert-butyl ether (MTBE) (0.001 mg/L) was detected in the
groundwater sample collected from temporary monitoring well TMW-1 MCG below the 2L
Standard (0.02 mg/L). No other target constituents were detected in the groundwater sample
collected from TMW-1 MCG. The groundwater analytical results are shown on Figure 8.

NC DOT plans indicate that soil will likely be excavated below the water table during installation of
the proposed drainage pipes in this area. The depth to groundwater is approximately 8.5 ft near
TMW-1 MCG and near existing grade in the streambed. Dewatering of groundwater will likely be
required during site work. Because groundwater is impacted, consultation with DENR with regard
15
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to the potential need for a NPDES permit for dewatering activities should be conducted prior to
construction activities.

4.0 Investigative Derived Waste
Decontamination/purge water and soil cuttings generated during the soil boring and well installation
activities were containerized in 55-gallon drums and stored at the Mecklenburg County
Maintenance Garage pending analysis. A composite sample of the purge water was analyzed for
PCBs using EPA Method 8082, VOCs using EPA Method 8260, SVOCs using EPA Method 8270
and pesticides using EPA Methods 8081 and 8141. A composite sample from the soil cuttings
drums was analyzed for PCBs using EPA Method 8082, TCLP VOCs using EPA Method 8260,
TCLP SVOCS using EPA Method 8270, TCLP pesticides using EPA Methods 8081 and 8141 and
for asbestos using EPA Method 600/R-93/116. Laboratory analytical data sheets and chain-of-
custody documentation for investigative derived waste are provided in Appendix E. The analytical
results are discussed below.

A low level concentration of dibromochloromethane was detected in the composite sample
collected from the water drum. No target constituents were detected in the composite sample
collected from the soil drum. The non-hazardous water and soil were properly disposed off site by
EVO Corporation of Winston-Salem, NC. The non-hazardous materials manifests are provided in
Appendix I.

5.0 Summary and Regulatory Considerations

H&H has reviewed DENR incident files, geophysical survey results, and historical soil and
groundwater analytical results for the MCG property. Previous assessment activities indicate that
soil is impacted with asbestos on the former Southern Manufacturing property which extends to the
areas beneath the proposed Maxwell Court extension. USTs (with associated releases) were
previously removed from the MCG property outside of proposed NC DOT work areas. Based on
GPR survey, no potential USTs were identified in the proposed NC DOT work areas. One existing
monitoring well was identified within proposed DOT work areas. If it will be disturbed by DOT
activities, the monitoring well should be abandoned in accordance with DENR regulations.
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Analytical results of soil samples collected by H&H indicate widespread asbestos impacts on the
MCG property. H&H estimates that there are roughly 45,000 cubic yards (67,500 tons) of asbestos
impacted soil between the surface and 12 ft in the western portion of the property and roughly 1,000
cubic yards (1,500 tons) of asbestos impacted soil between 2 ft and 8 ft near the corner of Maxwell
Court and NC Music Factory Boulevard near boring MCG-45. Asbestos impacted soils are mixed
with TPH and/or PCB impacted soils in certain areas on the property.

Analytical results also indicate pesticides, VOCs, and/or TPH DRO impacted soils in two other
locations on the MCG property. H&H estimates that there are roughly 180 cubic yards (270 tons)
of pesticide and VOCs impacted soil near the vector control building and roughly 100 cubic yards
(150 tons) of TPH DRO impacted soil in the maintenance garage near a hydraulic lift.

NC DOT plans indicate proposed cut areas for drainage piping installations and road
construction activities. NC DOT anticipates that roughly 1,050 cubic yards of asbestos/PCB/TPH
impacted soil and one cubic yard (or more) of TPH impacted soil near the maintenance building
will be excavated from the MCG property (Parcel 40), roughly 23.1 cubic yards of asbestos
impacted soil will be excavated from the NC Music Factory (Parcel 1), and roughly 351 cubic
yards of asbestos impacted soil will be excavated from the Duke Energy property (Parcel 2)
during road construction activities. Impacted soil that is disturbed or removed during the road
construction activities should be properly managed by trained personnel and disposed at a
permitted facility. Additional characterization of TPH impacted soils may be needed to meet the
soil disposal facility requirements.

Analytical results of a groundwater sample collected from one temporary monitoring well installed
near the center of the MCG property indicate a concentration of MTBE below the 2L Standard. NC
DOT plans indicate that soil will likely be excavated below the water table during installation of the
proposed drainage piping in this area. Dewatering of groundwater will likely be required during site
work. Because groundwater is impacted, consultation with DENR with regard to the potential need
for a NPDES permit for dewatering activities should be conducted prior to construction activities.
Table 1 (Page 1 of 2)
Soil Boring GPS Coordinate Data
Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Job No. ROW-413
S:\AAA-Master Projects\NC DOT Right-of-Way -ROW\ROW-413 Meck Southern Mfg Asbestos\Reports\Meck Garage\Tables
4/22/2013
Table 1 (Page 1 of 2)
Hart & Hickman
Sample ID Latitude Longitude
MCG-1 35.23757897083 -80.84189678333
MCG-2 35.23761804583 -80.84183754167
MCG-3 35.23761372917 -80.84175533750
MCG-4 35.23752605417 -80.84162521250
MCG-5 35.23746774167 -80.84138572083
MCG-6 35.23749605000 -80.84146921250
MCG-7 35.23745010417 -80.84131858333
MCG-8 35.23743855000 -80.84121330833
MCG-9 35.23737031667 -80.84092288750
MCG-10 35.24100703750 -80.84430484583
MCG-11 35.24084311667 -80.84414054583
MCG-12 35.24077144167 -80.84416285417
MCG-13 35.24061367500 -80.84421659167
MCG-14 35.24078186250 -80.84444967917
MCG-15 35.24064066667 -80.84399854167
MCG-16 35.24048967500 -80.84374433750
MCG-17 35.24036238333 -80.84392717083
MCG-18 35.24029453333 -80.84389937500
MCG-19 35.24017749583 -80.84377809583
MCG-20 35.24005388750 -80.84375779583
MCG-21 35.24038530833 -80.84346332083
MCG-22 35.24025307500 -80.84367295417
MCG-23 35.24016030833 -80.84360420417
MCG-24 35.23954837083 -80.84339512083
MCG-25 NA NA
MCG-26 NA NA
MCG-27 NA NA
MCG-28 NA NA
MCG-29 NA NA
MCG-30 NA NA
MCG-31 NA NA
MCG-32 NA NA
MCG-33 NA NA
Table 1 (Page 2 of 2)
Soil Boring GPS Coordinate Data
Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Job No. ROW-413
S:\AAA-Master Projects\NC DOT Right-of-Way -ROW\ROW-413 Meck Southern Mfg Asbestos\Reports\Meck Garage\Tables
4/22/2013
Table 1 (Page 2 of 2)
Hart & Hickman
Sample ID Latitude Longitude
MCG-34 35.23962581667 -80.84338018750
MCG-35 35.23954038333 -80.84342569583
MCG-36 NA NA
MCG-37 35.23941116667 -80.84348267500
MCG-38 35.24114750833 -80.84486114583
MCG-39 35.24117115000 -80.84475764583
MCG-40 35.24109155833 -80.84469437083
MCG-41 35.23920455417 -80.84370510833
MCG-42 35.23897880417 -80.84369504583
MCG-43 35.23891440000 -80.84392335833
MCG-44 35.23860069583 -80.84396965000
MCG-45 35.23852982083 -80.84387532917
MCG-46 35.23848717083 -80.84375842917
MCG-47 35.24050987083 -80.84384798333
TMW-1 35.24077144167 -80.84416285417
Notes:
GPS coordinate data points collected using a Magellan Mobile Mapper CX
with sub-meter accuracy.
NA = Sample collected indoors. Coordinate data unavailable.
Table 2 (Page 1 of 1)
Summary of Asbestos Soil Analytical Results
Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Job No. ROW-413
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Table 2 (Page 1 of 1)
Hart & Hickman, PC
Sample ID MCG-14 MCG-15 MCG-21 MCG-47 MCG-3
Sample Depth (ft)1-2 4-6 1-2 4-6 0-1 0-1 0-1 10-12 0-1 0-1 0-1 0-1 4-6 0-1 2-4 0-1 2-4 0-2 4-6
Sample Date 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013 2/20/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013
Asbestos (600/R-93/116)ND ND ND ND Chrysotile Chrysotile ND ND ND Chrysotile Chrysotile ND Chrysotile ND ND ND ND ND ND
Sample ID MCG-17
Sample Depth (ft)0-1 2-4 0-1 4-6 0-1 4-6 0-1 4-6 0-1 6-8 0-1 2-4 0-1 0-1 4-6 0-1 2-4 0-1 4-6
Sample Date 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/14/2013 2/15/2013 2/15/2013 2/19/2013 2/19/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013 2/15/2013
Asbestos (600/R-93/116)ND ND Chrysotile Chrysotile ND Chrysotile ND ND Chrysotile ND Chrysotile Chrysotile ND ND ND ND ND ND ND
Sample ID MCG-24 MCG-27
Sample Depth (ft)0-1 2-4 0-1 0-1 0-1 4-6 0-1 2-4 0-1 4-6 0-1 4-6 0-1 4-6 0-1 4-6
Sample Date 2/15/2013 2/15/2013 2/15/2013 2/18/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013 2/19/2013
Asbestos (600/R-93/116)ND ND ND ND ND ND ND ND ND ND ND ND ND Chrysotile
<0.1 % *ND ND
Notes:
EPA Method follows parameter in parenthesis; ND = Not detected.
Bold Chrysotile indicates presence of asbestos containing material (ACM).
* = Soil sample also analyzed for percentage of ACM by TEM CARB 435 Prep.
Former C&D Landfill Area
MCG-2MCG-1
MCG-19
MCG-7
Streambed Maxwell Court Extension and Drainage Features
MCG-16
Maxwell Court Extension and Drainage Features
MCG-22
MCG-4 MCG-5
MCG-20
MCG-6
MCG-11 MCG-13
MCG-45 MCG-46
MCG-12MCG-8 MCG-9 MCG-10
Maxwell Court Extension and Drainage Features
MCG-41 MCG-42 MCG-43 MCG-44MCG-23
Table 3 (Page 1 of 2)
Summary of Soil Analytical Results
Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Job No. ROW-413
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Table 3 (Page 1 of 2)
Hart & Hickman, PC
Sample ID MCG-1 MCG-2 MCG-14 MCG-15 MCG-21 MCG-47 MCG-4 MCG-20 MCG-38 MCG-39 MCG-40
Sample Depth (ft)4-6 4-6 0-1 0-1 0-1 0-1 0.5-1 4-6 1-2 1-2 1-2
Sample Date 2/14/2013 2/14/2013 2/15/2013 2/15/2013 2/15/2013 2/20/2013 2/14/2013 2/19/2013 2/18/2013 2/18/2013 2/18/2013
PCBs (8082) (mg/kg)
Aroclor 1254 NA NA <0.286 0.531 <0.209 <0.0481 NA NA NA NA NA NE NE
Total PCBs NA NA BRL 0.531 BRL BRL NA NA NA NA NA 1.0 0.14
VOCs (8260) (mg/kg)
Acetone NA NA NA NA NA NA NA NA NA NA NA 12,000 24
n-Butylbenzene NA NA NA NA NA NA NA NA NA NA NA 110 2.4
sec-Butylbenzene NA NA NA NA NA NA NA NA NA NA NA NE 2.2
Isopropylbenzene NA NA NA NA NA NA NA NA NA NA NA 270 1.3
p-Isopropyltoluene NA NA NA NA NA NA NA NA NA NA NA NE 0.68
Methylene Chloride NA NA NA NA NA NA NA NA NA NA NA 56 0.023
Naphthalene NA NA NA NA NA NA NA NA NA NA NA 3.6 0.21
n-Propylbenzene NA NA NA NA NA NA NA NA NA NA NA 260 1.5
1,2,4-Trimethylbenzene NA NA NA NA NA NA NA NA NA NA NA 12 6.7
1,3,5-Trimethylbenzene NA NA NA NA NA NA NA NA NA NA NA 160 6.7
Xylenes, total NA NA NA NA NA NA NA NA NA NA NA 130 5.8
Pesticides (8081/8141) (mg/kg)
4,4' - DDE NA NA NA NA NA NA NA NA NA NA NA 1.4 0.24
4,4' - DDT NA NA NA NA NA NA NA NA NA NA NA 1.7 0.34
Heptachlor NA NA NA NA NA NA NA NA NA NA NA 0.11 0.0066
TPH-DRO/GRO (8015)
(mg/kg)
Diesel-Range Organics (DRO)54.7 36.4 NA NA NA NA 295 <6.2 73 14.9 7.3
Gasoline-Range Organics (GRO)<5.9 <6.0 NA NA NA NA 12.5 <7.6 <5.6 <6.0 <5.5
Notes:
1. NC DENR Inactive Hazardous Sites Branch (IHSB) Residential Health-Based Soil Remediation Goals (SRGs) - February 2013
2. NC DENR IHSB Protection of Groundwater (POG) SRG - February 2013
EPA Method follows parameter in parenthesis; NA = Not analyzed; NE = Not established
BRL = Below laboratory reporting limit; VOCs = volatile organic compounds
PCBs = Polychlorinated Biphenyls; SVOCs = semi-volatile organic compounds; TPH = total petroleum hydrocarbons
Bold exceeds POGSRG or NC DENR Action Level
Former C&D Landfill Streambed Maxwell Court Extension and Drainage Features
NC DENR Action Level
(mg/kg)
10
10
Screening Criteria
IHSB POG2
(mg/kg)
IHSB SRG1
(mg/kg)
Table 3 (Page 2 of 2)
Summary of Soil Analytical Results
Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Job No. ROW-413
S:\AAA-Master Projects\NC DOT Right-of-Way -ROW\ROW-413 Meck Southern Mfg Asbestos\Reports\Meck Garage\Tables
Table 3 (Page 2 of 2)
Hart & Hickman, PC
Sample ID
Sample Depth (ft)
Sample Date
PCBs (8082) (mg/kg)
Aroclor 1254
Total PCBs
VOCs (8260) (mg/kg)
Acetone
n-Butylbenzene
sec-Butylbenzene
Isopropylbenzene
p-Isopropyltoluene
Methylene Chloride
Naphthalene
n-Propylbenzene
1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
Xylenes, total
Pesticides (8081/8141) (mg/kg)
4,4' - DDE
4,4' - DDT
Heptachlor
TPH-DRO/GRO (8015)
(mg/kg)
Diesel-Range Organics (DRO)
Gasoline-Range Organics (GRO)
MCG-18 MCG-25 MCG-26 MCG-27 MCG-28 MCG-29 MCG-30 MCG-31 MCG-32 MCG-33 MCG-35 MCG-36 MCG-37
2-4 10-12 8-10 8-10 8-10 1-2 6-8 6-8 2-4 6-8 0-1 10-12 0-1 0-1 0-1
2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013 2/18/2013
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NE NE
NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1.0 0.14
<0.103 NA NA NA NA NA NA NA 0.125 NA 0.116 <2.58 0.0949 0.17 <0.0993 12,000 24
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 0.907 <0.0047 <0.0051 <0.0050 110 2.4
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 0.411 <0.0047 <0.0051 <0.0050 NE 2.2
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 0.135 <0.0047 <0.0051 <0.0050 270 1.3
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 0.608 <0.0047 <0.0051 <0.0050 NE 0.68
0.0207 NA NA NA NA NA NA NA <0.0205 NA <0.019 <0.516 <0.0188 <0.0204 <0.0199 56 0.023
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 1.23 <0.0047 <0.0051 <0.0050 3.6 0.21
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 0.32 <0.0047 <0.0051 <0.0050 260 1.5
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 1.99 <0.0047 <0.0051 <0.0050 12 6.7
<0.0051 NA NA NA NA NA NA NA <0.0051 NA <0.0047 1.25 <0.0047 <0.0051 <0.0050 160 6.7
<0.0103 NA NA NA NA NA NA NA <0.0103 NA <0.0095 0.281 <0.0094 <0.0102 <0.0099 130 5.8
NA NA NA NA NA NA NA NA NA NA <0.0263 <0.0026 <0.120 0.0028 <0.0027 1.4 0.24
NA NA NA NA NA NA NA NA NA NA <0.0263 <0.0026 <0.120 0.0057 <0.0027 1.7 0.34
NA NA NA NA NA NA NA NA NA NA <0.0263 0.0032 <0.120 <0.0025 <0.0027 0.11 0.0066
8.1 <6.0 <6.1 <6.6 <6.7 <5.4 122 <5.9 <5.6 <6.7 NA NA NA NA NA
<6.4 NA NA NA NA NA NA NA <6.9 NA NA NA NA NA NA
Notes:
1. NC DENR Inactive Hazardous Sites Branch (IHSB) Residential Health-Based Soil Remediation Goals (SRGs) - February 2013
2. NC DENR IHSB Protection of Groundwater (POG) SRG - February 2013
EPA Method follows parameter in parenthesis; NA = Not analyzed; NE = Not established
BRL = Below laboratory reporting limit; VOCs = volatile organic compounds
PCBs = Polychlorinated Biphenyls; SVOCs = semi-volatile organic compounds; TPH = total petroleum hydrocarbons
Bold exceeds POGSRG or NC DENR Action Level
10
10
MCG-34
Maintenance Garage Hydraulic Lifts, Trench Drain, and Wash Pad Area Vector Control Building Screening Criteria
IHSB SRG1
(mg/kg)
IHSB POG2
(mg/kg)
NC DENR Action Level
(mg/kg)
Table 4 (Page 1 of 1)
Summary of Groundwater Analytical Results
Mecklenburg County Maintenance Garage
Charlotte, Mecklenburg County, North Carolina
H&H Job No. ROW-413
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Table 4 (Page 1 of 1)
Hart & Hickman, PC
Sample ID TMW-1 MCG
Screen Interval (ft)5-15
Sample Date 2/20/2013
VOCs (8260) (mg/L)
Methyl-tert -butyl ether 0.001
SVOCs (8270) (mg/L)BRL
Notes:
1. 15A NCAC 2L .0202 Groundwater Quality Standards
EPA Method follows parameter in parenthesis;
BRL=Below laboratory reporting limit; VOCs=volatile organic compounds
SVOCs=semi-volatile organic compounds
Screening Criteria
NC 2L Standard1
(mg/L)
0.02
Varies

Appendix A NC DOT Preliminary Plan

Appendix B DENR Incident Files

Appendix C GEL Engineering of NC, Inc. Geophysical Survey Report

March 8, 2013
Mr. David Graham
Hart & Hickman, PC
2923 South Tryon Street, Suite 100
Charlotte, NC 28203

Re: Report for Geophysical Survey to Identify Underground
Utilities and Potential Underground Storage Tanks  620 West 10th Street (ADM Milling Site)  900 West 12th Street Charlotte, North Carolina
Dear Mr. Graham,
GEL Engineering of NC, Inc. appreciates the opportunity to provide Hart & Hickman with
this report of our geophysical investigation at the referenced sites. This investigation was
designed to determine the potential presence of underground storage tanks (USTs) at the sites,
as well as underground utilities that could obstruct drilling activities at the site. The
geophysical field investigation was successfully performed on February 11-14, 2013.

1.0 Summary of Results

Multiple subsurface anomalies were identified in the geophysical data. Figure 1 (620 West
10th Street) and Figure 2 (900 West 12th Street) depict the approximate location and size of the
anomalies, as well as the known metallic surface objects present at the time of the investigation.
The findings for each site are summarized below.

620 West 10th Street (ADM Milling Site)
Four anomalies were identified during the field investigation at the ADM Milling site, as
shown in Figure 1. The approximate locations of these anomalies were marked in the field
with marking paint. One anomaly was denoted as a “Possible UST” but the remaining
anomalies were not characteristic of USTs. The anomalies not denoted as USTs in post-
processed data in Figure 1 are consistent with known metallic surface objects and cultural
interference and are not characteristic of typical UST signatures. Photos of the site and
selected field markings are included in Attachment I.

900 West 12th Street
No anomalies thought to be USTs were identified during the field investigation at this site,
which is shown in Figure 2. One anomaly, identified as “Buried Metallic Debris,” was
identified in the post-processed TDEM data following the investigation. The remaining
anomalies shown on Figure 2 are consistent with known metallic surface objects and
cultural interference and are not characteristic of typical UST signatures. Photos of the site
and selected field markings are included in Attachment I.
Mr. David Graham
March 8, 2013
Page 2

Although geophysical methods provide a high level of assurance for the location of
subsurface objects, the possibility exists that not all features can or will be identified. Therefore,
due caution should be used when performing any subsurface excavation, and GEL Engineering
of NC, Inc. will not be liable for any damages that may occur.

2.0 Overview of Geophysical Investigation

The geophysical evaluation included the deployment of radio-frequency electromagnetic
pipe and cable locators (EM), ground penetrating radar (GPR) and time-domain electromagnetic
(TDEM) technologies to the site. These technologies were used in concert with one another in
order to identify the presence and approximate horizontal positions of detectable underground
utilities and potential USTs at the site. A brief description of each technology is presented in
Attachment II.
3.0 Field Procedures and Results

The geophysical field investigation was successfully performed on February 11-14, 2013,
at 620 West 10th Street and 900 West 12th Street in Charlotte, NC. Based on subsurface soil
conditions, GPR signal penetration at each site was limited to a depth of approximately 2.5 feet
below land surface. Interpretation of the GPR data was conducted in the field and any potential
anomalies detected with GPR were marked in the field. GPR data processing included band pass
filtering, background removal, horizontal smoothing, and gain adjustments.

TDEM was also used to scan the project sites. Any significant electromagnetic anomalies
indicative of buried metallic objects were marked in the field. Additional TDEM responses were
present in the data following post-processing, but correlated to surface metallic debris and/or
above ground metal structures and therefore were not considered to be indicative of USTs.

Multiple subsurface anomalies were identified in the geophysical data collected at 620
West 10th Street, as shown on Figure 1. Figure 1 depicts the approximate location and size of
the anomalies as well as the known metallic surface objects present at the time of the
investigation. Three geophysical anomalies detected with TDEM were designated in the field
with marking paint, along with one anomaly designated with GPR. Two of the TDEM
anomalies, denoted in Figure 1, were not consistent with signatures typical of USTs. The GPR
anomaly was also not thought to be a UST. However, based upon historical data, the TDEM
data, and an interview with the site owner, one TDEM anomaly, denoted in Figure 1, was labeled
a “Possible UST.”

Of the geophysical anomalies identified in the TDEM data at 900 West 12th Street, as
shown on Figure 2, none were considered were not consistent with the signatures typical of
USTs. Therefore, no evidence of potential USTs was detected at this site.

The locations of underground utilities were designated using EM and GPR equipment, and
their locations were marked with paint on the land surface as shown in Figure 1 and Figure 2.
The locations of data points and selected site features were obtained using a Trimble S Series
Mr. David Graham
March 8, 2013
Page 3

robotic total station and a Trimble 5800 GPS antenna, which obtained sub-meter accuracy using
corrections provided by the North Carolina VRS network.

4.0 Closing

GEL Geophysics appreciates the opportunity to assist Hart & Hickman with this project. If
you have any questions or need further information regarding the project, please do not hesitate
to call me at [phone].

Yours very truly,

William S. Dovell
Project Manager

attachments

fc: hahi00113_Charlotte.report.doc
ATTACHMENT I
SITE PHOTOS

Above: 620 West 10th Street site (ADM Milling) looking west from southeast corner, showing railroad
tracks, and other metallic structures on surface.

Below: 620 West 10th Street site (ADM Milling), showing TDEM anomaly marked in the field.

ATTACHMENT I
SITE PHOTOS

Above: 620 West 10th Street site (ADM Milling), showing TDEM anomaly marked in the field.

Below: 620 West 10th Street site (ADM Milling), showing TDEM and GPR anomalies marked in the
field.

ATTACHMENT I
SITE PHOTOS

Above: 620 West 10th Street site (ADM Milling) looking east from NC Music Factory Dr.

Below: 900 West 12th Street site(Mecklenburg County garage) looking northeast from Maxwell Court.

ATTACHMENT I
SITE PHOTOS

Above: 900 West 12th Street (Mecklenburg County Garage) looking southwest along entrance.

Below: 900 West 12th Street (Mecklenburg County Garage) showing metallic surface objects.

ATTACHMENT I
SITE PHOTOS

Above: 900 West 12th Street site(Mecklenburg County Garage), looking east along north side of building.

Below: 900 West 12th Street (Mecklenburg County Garage) showing ASTs and metallic surface objects.

ATTACHMENT I
SITE PHOTOS

Above: 900 West 12th Street site (Mecklenburg County Garage), showing reinforced concrete slab and
out-building.
ATTACHMENT II
EQUIPMENT AND METHODOLOGIES

The information below is an overview of the methodologies typically employed in SUE
investigations. The intent of this overview is to give the reader a better understanding of
geophysical methods and background information as to what is actually measured, the resolution
of the method, and the limitations imposed by site-specific subsurface conditions.

Radio-Frequency Electromagnetic

Radio-Frequency Electromagnetic (EM) utility locating equipment consists of a transmitter
and a dual-function receiver. The receiver can be operated in a “passive” mode or in an “active”
mode. The two modes of operation provide various levels of detection capabilities depending on
the specific target or application.

The EM system is operated in the “active” mode by either inducting or conducting a signal
into the underground utility to be traced. A transmitter is placed over and in line with a
suspected buried utility. The transmitter induces a signal, which propagates along the buried
utility. As the receiver is moved back and forth across the suspected path of the utility, the trace
signal induces a signal into the receivers coil sensor. A visual and audio response indicates when
the receiver is directly over the buried utility.

Another means of detecting in the “active” mode utilizes a method to “conduct” a signal
within the buried utility. To accomplish this, a cable from the transmitter is clamped onto an
exposed section of the buried utility and a signal propagates along the buried line. This
technique minimizes any interference caused by parasitic emissions from adjacent cables in
congested areas. When the system is utilized in the “passive” mode, the receiver is responding to
a 60 Hertz cycle current energized by underground utilities.

Interference can and may occur when buried utilities intersect or are adjacent to each
other. This effect referred to as “bleed-off” may provide a false response to the identification of
the tracked utility. “Bleed-off” is caused by utilities that may be energized in the “active” or
“passive” mode.

Ground Penetrating Radar Methodology

A RAMAC digital radar control system configured with a 250 Megahertz (MHz) antenna
array was used in this investigation. GPR is an electromagnetic geophysical method that detects
interfaces between subsurface materials with differing dielectric constants. The GPR system
consists of an antenna which houses the transmitter and receiver, a digital control unit which
both generates and digitally records the GPR data, and a color video monitor to view data as it is
collected in the field.

The transmitter radiates repetitive short-duration electromagnetic waves (at radar
frequencies) into the earth from an antenna moving across the ground surface. These radar
waves are reflected back to the receiver from the interface of materials with different dielectric
constants. The intensity of the reflected signal is a function of the contrast in the dielectric
ATTACHMENT II
EQUIPMENT AND METHODOLOGIES

constant between the materials, the conductivity of the material through which the wave is
traveling, and the frequency of the signal.

Subsurface features that commonly cause such reflections are: 1) natural geologic
conditions, such as changes in sediment composition, bedding, and cementation horizons and
voids; or 2) unnatural changes to the subsurface such as disturbed soils, soil backfill, buried
debris, tanks, pipelines, and utilities. The digital control unit processes the signal from the
receiver and produces a continuous cross-section of the subsurface interface reflection events.

GPR data profiles were collected along transects covering the entire rights of ways. Depth
of investigation of the GPR signal is highly site-specific and is limited by signal attenuation
(absorption) in the subsurface materials. Signal attenuation is dependent upon the electrical
conductivity of the subsurface materials. Signal attenuation is greatest in materials with
relatively high electrical conductivities such as clays, brackish groundwater, or groundwater with
a high dissolved solid content from natural or manmade sources. Signal attenuation is lowest in
relatively low conductivity materials such as dry sand or rock. Depth of investigation is also
dependent on the antenna's transmitting frequency. Depth of investigation generally increases as
transmitting frequency decreases; however, the ability to resolve smaller subsurface features is
diminished as frequency is decreased. The average depth of penetration at this site was limited
to approximately two and a half feet below the surface which rendered GPR of very limited
value for this project.

The GPR antenna used at this site is internally shielded from aboveground interference
sources. Accordingly, the GPR response is not affected by overhead power lines, metallic
buildings, or nearby objects.

Time Domain Electromagnetic Methodology

TDEM methods measure the electrical conductivity of subsurface materials. The
conductivity is determined by inducing (from a transmitter) a time or frequency-varying
magnetic field and measuring (with a receiver) the amplitude and phase shift of an induced
secondary magnetic field. The secondary magnetic field is created by subsurface conductive
materials behaving as an inductor as the primary magnetic field is passed through them.

The Geonics EM-61 system used in this investigation operates within these principles.
However, the EM-61 TDEM system can discriminate between moderately conductive earth
materials and very conductive metallic targets. The EM-61 consists of a portable coincident loop
time domain transmitter and receiver with a 1.0-meter x 0.5-meter coil system. The EM-61
generates 150 pulses per second and measures the response from the ground after transmission or
between pulses. The secondary EM responses from metallic targets are of longer duration than
those created by conductive earth materials. By recording the later time EM arrivals, only the
response from metallic targets is measured, rather than the field generated by the earth material.

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1) UNDERGROUND FEATURES WERE LOCATED USING VISUAL EVIDENCE, GROUND PENETRATING
RADAR (GPR), AND TIME DOMAIN ELECTROMAGNETIC (TDEM) METHODS. OTHER BURIED UTILITIES
AND STRUCTURES MAY EXIST BUT WERE NOT DETECTED DUE TO LIMITATIONS OF THE
GEOPHYSICAL METHODS, SITE ACCESS, AND/OR HIGH TARGET CONGESTION. THEREFORE, DUE
CAUTION SHOULD BE USED WHEN PERFORMING SUBSURFACE EXCAVATION ACTIVITIES WHERE
POTENTIAL CONFLICTS EXIST. GEL ENGINEERING OF NC, INC. IS NOT RESPONSIBLE FOR DAMAGES
THAT MAY OCCUR. IDENTIFYING THE LOCATION OF SOME UTILITIES MAY ONLY BE POSSIBLE WITH
VACUUM OR OTHER EXCAVATION METHODS.
2) FIELD SURVEY CONDUCTED ON 2.11-14.13.
3) DATA FROM GEONICS, LTD. EM-61 MKII AND MALA GEOSCIENCE GROUND PENETRATING RADAR.
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RESULTS OF GEOPHYSICAL INVESTIGATION
620 WEST 10TH STREET
CHARLOTTE, NORTH CAROLINA
Hart & Hickman
Charlotte, North Carolina
STSAPPROVED BY:
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HAHI00113
March 8, 2013DATE:
PROJECT:
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Mecklenburg CountyBuildingSurface MetalReinforced ConcreteBuried Metallic Debris Surface MetalSurface MetalBuildingBuildingan Affiliate of THE GEL GROUP, INC.GELgrouplogo.jpg1) UNDERGROUND FEATURES WERE LOCATED USING VISUAL EVIDENCE, GROUND PENETRATINGRADAR (GPR), AND TIME DOMAIN ELECTROMAGNETIC (TDEM) METHODS. OTHER BURIED UTILITIESAND STRUCTURES MAY EXIST BUT WERE NOT DETECTED DUE TO LIMITATIONS OF THEGEOPHYSICAL METHODS, SITE ACCESS, AND/OR HIGH TARGET CONGESTION. THEREFORE, DUECAUTION SHOULD BE USED WHEN PERFORMING SUBSURFACE EXCAVATION ACTIVITIES WHEREPOTENTIAL CONFLICTS EXIST. GEL ENGINEERING OF NC, INC. IS NOT RESPONSIBLE FOR DAMAGESTHAT MAY OCCUR. IDENTIFYING THE LOCATION OF SOME UTILITIES MAY ONLY BE POSSIBLE WITHVACUUM OR OTHER EXCAVATION METHODS.2) FIELD SURVEY CONDUCTED ON 2.11-14.13.3) DATA FROM GEONICS, LTD. EM-61 MKII AND MALA GEOSCIENCE GROUND PENETRATING RADAR.EFOTSSWUKSDTGRESULTS OF GEOPHYSICAL INVESTIGATION900 WEST 12TH STREETCHARLOTTE, NORTH CAROLINAHart & HickmanCharlotte, North CarolinaSTSAPPROVED BY:FIGURE2DRAWN BY:HAHI00113March 8, 2013DATE:PROJECT:WSD

Appendix D Soil Boring Logs

Appendix E Laboratory Analytical Reports