22040_Brownfields Assessment Work Plan Metromont Concrete Facility (BPN 22040-18-060)_20190122

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Brownfields Assessment Work Plan
Metromont Concrete Facility
4101 Greensboro Street
Charlotte, North Carolina
H&H Job No. MTC-001

Table of Contents

1.0 Introduction .............................................................................................................................1 
1.1 Historical Underground Storage Tank Assessment Activities ..............................................2 
1.2 Recent Environmental Assessment Activities .......................................................................4 
2.0 Proposed UST Assessment Activities ....................................................................................7 
2.1 Receptor Survey ....................................................................................................................7 
2.2 UST Soil Sampling Activities ...............................................................................................8 
2.3 UST Groundwater Sampling Activities .................................................................................9 
2.4 Limited Site Assessment Reporting ....................................................................................11 
3.0 Brownfields Assessment Activities ......................................................................................12 
3.1 Soil Sampling Activities ......................................................................................................12 
3.2 Groundwater Sampling Activities .......................................................................................14 
3.3 Soil Gas Sampling Activities ...............................................................................................15 
3.4 Quality Assurance – Quality Control ..................................................................................17 
3.5 Investigation Derived Waste ...............................................................................................18 
3.6 Reporting .............................................................................................................................18 

List of Figures

Figure 1 Site Location Map
Figure 2 Site Map
Figure 3 Proposed Sample Location Map

List of Appendices

Appendix A Template Brownfields Property Receptor Survey Form
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Brownfields Assessment Work Plan
Metromont Concrete Facility
4101 Greensboro Street
Charlotte, North Carolina
H&H Job No. MTC-001

1.0 Introduction

On behalf of Sugar Creek Ventures, LLC (Prospective Developer or PD), Hart & Hickman, PC
(H&H) is providing this Work Plan to conduct Brownfields assessment activities at the
Metromont Concrete Facility Brownfields property (Brownfields Project No. 22040-18-060)
located at 4101 Greensboro Street in Charlotte, Mecklenburg County, North Carolina (Site or
subject Site). The Site consists of two contiguous parcels totaling approximately 18.5 acres of
land located in an industrial and commercial area northeast of Uptown Charlotte.

The Site is developed with three primary manufacturing buildings ranging from approximately
4,900 square foot (sq ft) to 48,000 sq ft. There are also multiple smaller ancillary structures
located on the subject Site. Remaining portions of the Site consist primarily of gravel-covered
storage areas. A Site location map is provided as Figure 1, and the Site and surrounding area are
shown in Figure 2.

The Site was predominantly undeveloped wooded land until the 1950s when the Site was
developed with concrete manufacturing buildings. The Site was operated as a concrete
manufacturing facility by multiple tenants including Exposaic Industries, Inc. from the early to
mid-1950s until approximately 1997. The Site has most recently been occupied by the
Metromont Corporation (Metromont) for structural pre-cast concrete manufacturing operations.
However, Metromont operations are currently being decommissioned and the Site is
predominantly unoccupied with only limited Metromont employees on-Site completing pre-
existing orders for pre-cast concrete building materials.

H&H has reviewed available reports documenting environmental assessment activities
previously completed at the Site by others. A summary of our review is provided in Section 1.1
and Section 1.2 below.
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1.1 Historical Underground Storage Tank Assessment Activities

H&H reviewed available environmental assessment reports documenting underground storage
tank (UST) closure and subsequent assessment activities previously completed at the Site by
others. A brief summary of the previous UST reports is provided below:
 A UST Closure Report prepared by Trigon Engineering Consultants, Inc. (Trigon) on
September 15, 1995 indicates that the previous occupant, Exposaic Industries, Inc.
operations included use of the following USTs:
o Tank No. 1 – 8,000-gallon diesel UST installed in April 1960
o Tank No. 2 – 8,000-gallon gasoline UST installed in April 1975
o Tank No.3 – 8,000-gallon fuel oil UST installed in April 1962
o Tank No. 4 – 6,000-gallon fuel oil UST installed in April 1954

Information provided in the UST Closure Report indicates that Trigon removed Tank No.
1, Tank No. 2, and Tank No. 3 in August 1995. Tank No. 4 was closed in-place by filling
the UST with concrete due to inaccessibility for heavy machinery needed to remove the
tank. Locations of the former USTs and the abandoned UST are shown on Figure 2.

Laboratory analytical results of UST closure soil samples indicated that total petroleum
hydrocarbons as diesel range organics (TPH-DRO) was detected above the laboratory
reporting limits in soil samples collected beneath the Tank No. 3 fuel oil UST (274
milligrams per kilogram [mg/kg]) and beneath the Tank No. 2 gasoline UST dispenser
system (761 mg/kg). TPH concentrations were not detected above the laboratory
reporting limits for closure soil samples collected for the remaining USTs. However, at
the time of the UST closure activities, Trigon excavated approximately 25 cubic yards of
potentially impacted soil from the Tank No. 1 diesel UST basin and approximately 5
cubic yards of potentially impacted soil from the Tank No. 2 gasoline UST dispenser
system area. The potentially impacted soil was stockpiled on-Site for off-Site disposal.

 H&H reviewed a Phase III Groundwater Assessment report prepared by J.L. Rodgers and
Callcott Engineers, Inc. (R&C) and dated in May 1996. The Phase III environmental
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assessment activities were completed to evaluate the potential for groundwater impacts in
areas of concern identified in previously completed Phase I and Phase II assessments.
H&H was not provided copies of the Phase I or Phase II reports for review. Information
provided in the Phase III report indicates that three permanent groundwater monitoring
wells (MW-1, MW-2, and MW-3) were installed at the Site in 1995 during Phase II
assessment activities. Subsequent Phase III assessment activities consisted of installation
of two additional permanent groundwater monitoring wells (MW-4 and MW-5) and
collection of groundwater samples for laboratory analysis from the five on-Site monitor
wells. Locations of the Phase II and Phase III monitoring wells are shown in Figure 2
and were installed in the following locations:
o Monitoring wells MW-1 and MW-2 were installed adjacent to the Tank No. 4 fuel
oil UST that was closed in-place with concrete;
o Monitoring well MW-3 was installed in the vicinity of the Tank No. 1 diesel
UST;
o Monitoring well MW-4 was installed in the area of historical acid wash
operations in the northeastern portion of the Site; and
o Monitoring well MW-5 was installed in the area of Tank No. 3 fuel oil UST.

On July 22, 1996, groundwater samples were collected from each of the five monitoring
wells and submitted for laboratory analysis of volatile organic compounds (VOCs) and
Acid/Base Neutral Extractables. Laboratory analytical results indicated that naphthalene
(22 micrograms per liter [µg/L]), 1,2,4-trimethylbenzene (11 µg/L), and 2-
methylnaphthalene (25 µg/L) were detected above the laboratory reporting limits in the
MW-1 groundwater sample. The naphthalene concentration exceeded the North Carolina
Department of Environmental Quality (DEQ) 2L Groundwater Quality Standard (2L
Standard) of 6 µg/L. No other compounds were detected above the 2L Standards in the
MW-1 groundwater sample. No compounds were detected above the 2L Standards in the
MW-2 through MW-5 groundwater samples.

Based on results of the UST closure activities completed at the Site by Trigon and the
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subsequent assessment activities completed at the Site by R&C, DEQ has not provided
regulatory closure for the Exposaic release incident (Incident No. 15459). Based on
conversations with DEQ UST Section personnel, a Phase I Limited Site Assessment (LSA) is
needed to evaluate risks and request regulatory closure for the releases identified at the Site in
the areas of the removed USTs (Tank No. 1 through Tank No. 3) and closed in-place UST (Tank
No. 4).

1.2 Recent Environmental Assessment Activities

H&H reviewed the Phase II Environmental Site Assessment (ESA) report prepared for the Site
by ECS Southeast, LLP (ECS) and dated February 12, 2018. ESC completed soil and
groundwater sampling activities at the Site to evaluate the potential for impacts associated with
environmental concerns identified during Phase I ESA activities. H&H was not provided a copy
of the ECS Phase I ESA report for review. However, information provided in the Phase II ESA
report indicates that results of the Phase I ESA identified several potential environmental
concerns in connection with the Site including the following:
 ESC identified on-Site potential environmental concerns associated with historical acid
wash runoff, the open UST release incident, and staining on concrete floors within the
manufacturing building located in the northern portion of the Site.

 ECS identified off-Site potential environmental concerns for the Site including the
nearby leaking UST (LUST) incident at the Tarmac Virginia Inc. property located south-
southwest of the Site, the reported USTs located on the west adjacent Concrete Supply
Co. property, and the former Tryon Mall Cleaning dry-cleaning operations located
southeast of the Site.

In April 2018, ECS collected four (4) soil samples (SB-1, SB-3, SB-5, and SB-6) and three (3)
groundwater samples (GW-1, GW-4, and GW-6) for laboratory analysis to evaluate the potential
for impact in areas of concern identified during the Phase I ESA activities. The soil samples
were submitted for laboratory analysis of TPH-DRO and TPH as gasoline range organics (TPH-
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GRO). The groundwater samples were submitted for laboratory analysis of volatile organic
compounds (VOCs) and semi-VOCs (SVOCs). In addition to the groundwater samples collected
for laboratory analysis, five (5) groundwater samples were collected in the area of the acid wash
operations (Figure 2) and analyzed in the field for pH. ECS Phase II ESA soil and groundwater
sample locations are shown on Figure 2. A summary of the Phase II ESA soil and groundwater
sampling results is provided below:

 Soil sample laboratory analytical results did not identify TPH at concentrations
exceeding the DEQ UST Section Action Levels in any of the Phase II ESA samples
collected at the Site.

 Groundwater sample laboratory analytical results indicate that several VOCs were
detected above the laboratory reporting limits in the GW-1 groundwater sample collected
in the northwestern portion of the Site (Figure 2). The compounds cis-1,2-dichloroethene
(170 µg/L), trichloroethene or TCE (24 µg/L), and vinyl chloride (3.3 µg/L) were
detected at concentrations exceeding the 2L Standards of 70 µg/L, 3.0 µg/L, and 0.03
µg/L, respectively. In addition, the TCE and vinyl chloride concentrations detected in
the GW-1 groundwater sample exceed the DEQ Division of Waste Management (DWM)
Residential Vapor Intrusion Groundwater Screening Levels (GWSLs) of 1.0 µg/L and 1.5
µg/L, respectively. The TCE concentration also exceeds the Non-Residential GWSL of
4.4 µg/L. No other VOCs were detected above the 2L Standards or GWSLs in the GW-1
groundwater sample. No VOCs were detected above the 2L Standards in any of the other
groundwater samples collected at the Site. No SVOCs were detected above the
laboratory reporting limits in any of the groundwater samples collected at the Site.

 pH field measurements of groundwater samples collected in the area of the acid wash
operations indicate that pH is within the expected range of 6.5 standard units (SU) and
8.5 SU for each groundwater sample with the exception of groundwater sample GW-13
collected northwest of the acid wash station. Field measurements indicate that pH (9.25
SU) in groundwater northwest of acid wash operation area is slightly higher than the
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expected range (i.e., more basic than acidic).

Based on results of the ECS groundwater assessment activities, groundwater in the northwestern
portion of the Site is impacted with chlorinated solvent compounds at concentrations above the
DEQ 2L Standards and the DWM Vapor Intrusion GWSLs.

The Site received eligibility into the DEQ Brownfields Program via a Letter of Eligibility dated
July 6, 2018. The PD elected to participate in the Brownfields Program Redevelopment Now
option. As part of this process, a kick-off/data gap meeting with PD, DEQ Brownfields
personnel, and H&H was held on September 20, 2018 to discuss historical uses of the Site,
available environmental information, proposed redevelopment plans, data gaps, and the proposed
schedule for completing the Brownfields Agreement. The PD plans to redevelop the Metromont
Concrete Facility Brownfields property for mixed retail and high-density residential uses. The
proposed redevelopment plan is shown in Figure 3.

Based on the redevelopment plan for the Site and conversations with DEQ Brownfields during
the recent data gap meeting, H&H proposes to conduct Brownfields soil, groundwater, and soil
gas assessment activities at the Site to further evaluate the potential for impacts. In addition,
H&H proposes to collect background soil samples to establish Site-specific ranges for naturally
occurring metals. H&H will also conduct receptor survey activities in the area surrounding the
Site as part of the proposed assessment.

In addition to Brownfields assessment activities, H&H will complete soil and groundwater
sampling activities in the areas of the former USTs and the abandoned fuel oil UST. The UST
soil and groundwater sampling will be completed in accordance with the DEQ UST Section
Guidelines for completion of a Phase I LSA. The purpose of the Phase I LSA activities is to
further evaluate subsurface conditions in the areas of the former USTs and the abandoned fuel oil
UST to obtain risk-based regulatory closure through the DEQ UST Section. The proposed scope
of work for the UST-related assessment activities are outlined in Section 2.0, and the proposed
scope of work for the Brownfields assessment activities is provided in Section 3.0.
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2.0 Proposed UST Assessment Activities

The proposed UST assessment activities will be performed in general accordance with the DEQ
UST Section Guidelines for Assessment and Corrective Action (UST Guidelines) and the most
recent versions of the U.S EPA Region IV Science and Ecosystem Support Division (SESD)
Field Branches Quality System and Technical Procedures.

Prior to conducting field activities, H&H will contact North Carolina 811, the public utility
locator, to mark subsurface utilities located on the Site. H&H will also contract with a private
utility locator to screen proposed sample locations for subgrade utilities that may not be marked
by the public locator. Additionally, soil boring locations will be hand cleared to approximately 5
feet (ft) below the ground surface (bgs) prior to use of mechanical drilling equipment to further
screen the boring locations for the presence of subsurface utilities.

In accordance with Mecklenburg County rules, H&H will also obtain a Subsurface Investigation
Permit (SIP) from Mecklenburg County prior to temporary monitoring well installation and
sampling. After completion of the activities, H&H will update the SIP on the Mecklenburg
County Well Information database with North Carolina licensed driller temporary monitoring
well abandonment records.

2.1 Receptor Survey

H&H will perform a receptor survey in accordance with UST Guidelines and DEQ Brownfields
Program guidance. The receptor survey will include information about land use in the Site area
including zoning. H&H will also conduct a field search for water supply wells, basements,
utility manways and chases, storm sewers, other underground utilities, drains, and surface water
within a 1,500 ft radius of the Brownfield property boundaries. In addition, H&H will review
the online Mecklenburg County Well Information System for potential wells in the area and, if
warranted, contact utility companies for information concerning underground utilities in the
immediate area of the Site. For Brownfields purposes, the receptor survey will be completed
using the most current version of the Brownfields Property Receptor Survey template form. A
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copy of Brownfields Property Receptor Survey template form is provided as Appendix A.

2.2 UST Soil Sampling Activities

Per the UST Guidelines, LSA requirements include the installation of a co-located soil boring
and groundwater monitoring well for evaluating subsurface conditions at each potential source
area. Each of the four UST locations is considered a separate source area. As such, H&H will
team with a qualified drilling subcontractor to advance one co-located soil boring/temporary
monitoring well at each of the four UST areas. Each soil boring will be advanced to depths of
approximately 20 to 25 ft bgs or until adequate groundwater for collection of groundwater
samples is encountered. The locations of the proposed Phase I LSA co-located soil borings and
temporary monitoring wells are shown in Figure 3.

As noted above, the initial 5 ft of each boring will be advanced with a hand auger to minimize
the potential for damage to subsurface utilities. Beyond the initial 5 ft, the borings will be
advanced with a track-mounted drill rig capable of utilizing direct push technology (DPT)
drilling techniques. During drilling, continuous soil samples will be collected at each soil boring
from the center of the hand auger bucket and acetate lined macrocore sleeves. The soil samples
will be logged for lithologic description and field screened for the presence of staining and
elevated organic vapors using a calibrated photoionization detector (PID).

In accordance with UST Guidelines, a soil sample will be collected at a depth corresponding to
the depth of the UST base at each UST location. Information provided in the September 15,
1995 UST Closure Report prepared by Trigon indicates that the base of each UST was measured
to be approximately 10 ft bgs. Based on groundwater assessment results completed at the Site by
others, depth to the water table is not expected to be greater than 15 ft bgs. Therefore, one soil
sample will be collected for laboratory analysis from each boring in accordance with UST
Guidelines for completing Phase I LSA soil sampling where groundwater is less than 25 ft bgs.

Soil samples selected for laboratory analysis will be collected directly into laboratory supplied
glassware, labeled with the sample identification, time, date, and requested analysis. The
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samples will be placed in a laboratory supplied cooler with ice and delivered to a North Carolina
certified laboratory under standard chain of custody protocols for the following analyses:

 the former diesel UST (Tank No. 1) soil sample will be submitted for analysis of VOCs
by EPA Method 8260, SVOCs by EPA Method 8270, and volatile petroleum
hydrocarbons (VPH) and extractable petroleum hydrocarbons (EPH) by Massachusetts
Department of Environmental Protection (MADEP) methods;

 the former gasoline UST (Tank No. 2) soil sample will be submitted for analysis of
VOCs by EPA Method 8260 and VPH by MADEP; and

 soil samples collected in the area of the two former fuel oil USTs (Tank No. 3 and Tank
No. 4) will be submitted for analysis of VOCs by EPA Method 8260, SVOCs by EPA
Method 8270, and VPH and EPH by MADEP. The soil samples collected in the area of
Tank No. 3 will also be submitted for laboratory analysis of Resource Conservation and
Recovery Act (RCRA) metals plus hexavalent chromium by EPA Methods
6020/7471/7199.

Upon collection of the soil samples, the four soil borings will be converted to temporary
monitoring wells and Phase I LSA groundwater samples will be collected as described below.

2.3 UST Groundwater Sampling Activities

H&H will direct the drilling subcontractor to convert the Phase I LSA soil borings into
temporary monitoring wells. The temporary monitoring wells will be constructed of 1-inch
diameter PVC with 10 to 15 ft of well screen set to bracket the water table and 1-inch diameter
PVC well casing to the ground surface. A sand filter pack will be placed from the bottom of the
borings to approximately 2 ft above the top of the well screens. The temporary wells will be
completed by placing a minimum 2 ft hydrated bentonite seal above the sand filter pack.

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Once the temporary monitoring wells are installed, the wells will be allowed to equilibrate to
static conditions, and a decontaminated electronic water level indicator will be used to measure
the depth to the water table relative to the ground surface in each well. The wells will then be
developed by removing a minimum of 3 to 5 volumes and until field parameters have stabilized
(pH± 0.1 SU and conductivity varies no more than 5%).

After development, groundwater samples will be collected utilizing low flow/low stress purging
techniques using a peristaltic pump and dedicated polyethylene tubing. The intake point of the
pump tubing will be placed in the approximate mid-portion of the screened interval of the well,
and groundwater will be removed at a rate no greater than 200 milliliters per minute. H&H will
utilize calibrated water quality meters to collect measurements of pH, temperature, dissolved
oxygen, oxidation reduction potential, turbidity, and specific conductivity at three to five-minute
intervals during the purging process. Purging will be considered complete when the field
parameters stabilize (pH ± 0.1 SU and conductivity varies no more than 5%).

Once groundwater parameters stabilize, groundwater samples for VOC and VPH analysis will be
collected directly into laboratory supplied sample containers using the “soda straw” method to
eliminate the potential for volatile compound loss through the pump head. Samples collected for
the remaining analyses will be collected directly into laboratory supplied sample containers from
the dedicated sample tubing discharge. The sample containers will be labeled with the sample
identification, date, and requested analysis, and placed in a laboratory supplied cooler with ice.
The groundwater samples will be delivered to a North Carolina certified laboratory under
standard chain of custody protocols for the following analyses:

 the former diesel UST (Tank No. 1) groundwater samples will be submitted for analysis
of purgeable aromatics plus xylenes by EPA Method 602, Base Neutrals and Acids plus
10 TICs by EPA Method 625, and VPH and EPH by MADEP;

 the former gasoline UST (Tank No. 2) groundwater sample will be submitted for analysis
of VOCs by EPA Method 6200, VPH by MADEP; and lead by EPA Method 6010;
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 groundwater samples collected in the area of the two former fuel oil USTs (Tank No. 3
and Tank No. 4) will be submitted for analysis of purgeable aromatics plus xylenes by
EPA Method 602, Base Neutrals and Acids plus 10 TICs by EPA Method 625, and VPH
and EPH by MADEP. A groundwater sample will also be collected in the area of Tank
No. 3 and submitted for laboratory analysis of RCRA metals by EPA Methods
6020/7471.

Following sampling activities, the temporary monitoring wells will be surveyed to estimate the
top of casing and ground surface elevations in order to develop a groundwater potentiometric
surface map for the Site. After the temporary monitoring well survey has been conducted, the
temporary monitoring wells will be properly abandoned and the surfaces will be repaired similar
to pre-drilling conditions. Additionally, the Phase I LSA sampling locations will be estimated
using a hand-held global positioning system (GPS) unit.

2.4 Limited Site Assessment Reporting

Upon completion of the proposed field activities and receipt of the analytical data, H&H will
prepare a Phase I LSA report for submittal to the DEQ UST Section to document the UST
assessment activities. The report will include the results of the soil and groundwater data in
comparison to regulatory levels, a brief description of geology, receptor and land use survey
information, boring logs, tabular summaries of the laboratory analytical data, figures depicting
sample locations, and conclusions and recommendations concerning our activities. Based on the
results of previous assessment activities and the anticipated limited extent of impacts and the
anticipated low risk determination for the Site, the report will likely recommend risk-based
closure for the release incident.
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3.0 Brownfields Assessment Activities

The proposed Brownfields assessment activities will be performed in general accordance with
the DEQ Inactive Hazardous Sites Branch (IHSB) Guidelines for Assessment and Cleanup
(Guidelines) dated October 2015, the DEQ DWM Vapor Intrusion Guidance (VI Guidance)
dated March 2018, and most recent versions of the U.S. EPA SESD Field Branches Quality
System and Technical Procedures. The proposed Brownfields assessment activities will be
completed concurrently with the Phase I LSA assessment activities outlined above. In addition
to the Phase I LSA report outlined above, results of the proposed former UST assessment
activities will also be reported as part of the proposed Brownfields assessment activities outlined
in the following sections.

As described in Section 2.0, H&H will contact North Carolina 811 and a private utility locator to
screen and mark subsurface utilities located on the Site. H&H will also utilize the SIP from
Mecklenburg County obtained for Phase I LSA activities as part of the proposed Brownfields
groundwater assessment activities. After completion of the activities, H&H will update the SIP
on the Mecklenburg County Well Information database with North Carolina licensed driller
temporary monitoring well abandonment records.

3.1 Soil Sampling Activities

H&H will contract a qualified drilling contractor to advance one (1) soil boring in the vicinity of
the former acid wash operations area (Figure 2). The soil boring will be co-located with the
proposed Phase I LSA boring for the Tank No. 3 fuel oil UST (Figure 3).

The former acid wash operations area soil boring will be advanced with a track-mounted drill rig
capable of utilizing DPT drilling techniques. During drilling, continuous soil samples will be
collected from the hand auger (initial 5 ft bgs) and from acetate lined macrocore sleeves (depths
greater than 5 ft bgs). Soil samples will be logged for lithologic description and field screened
for the presence of staining and elevated organic vapors using a calibrated PID. H&H will
collect a soil sample for laboratory analysis from shallow soils (no greater that 5 ft bgs) to
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represent soil that may be disturbed during redevelopment activities in the area of the former
acid wash operations.

The soil sample selected for laboratory analysis will be placed directly into dedicated laboratory
supplied sample containers, labeled with the sample identification, date, and requested analysis,
and placed in a laboratory supplied cooler with ice. The soil sample will be submitted to a North
Carolina certified laboratory under standard chain of custody protocols for analysis of VOCs by
EPA Method 8260, SVOCs by EPA Method 8270, and RCRA metals plus hexavalent chromium
by EPA Methods 6020/7471/7199.

H&H also proposes to advance two (2) soil borings for collection of a soil samples from areas at
the Site that do not appear to have been affected by historical uses to evaluate background
concentrations of naturally occurring metals. The locations of the background soil borings will
be determined based on field observations and review of available historical resources. The
background soil borings will be advanced to approximately 5 ft bgs utilizing a decontaminated
stainless steel hand auger. Continuous soil samples will be collected from the center of the hand
auger bucket at each boring. Soil samples will be logged for lithological description and field
screened for indication of potential impacts by observation for staining and the presence of
organic vapors using a calibrated PID. One shallow soil sample will be collected for laboratory
analysis from each boring.

Following collection, the background soil samples will be placed in dedicated laboratory
supplied sample containers, labeled with the sample identification, date, and requested analysis,
and placed in a laboratory supplied cooler with ice. Background soil samples will be submitted
to a North Carolina certified laboratory under standard chain of custody protocols for analysis of
RCRA metals plus hexavalent chromium by EPA Methods 6020/7471/7199.

Following sampling activities, the soil borings will be properly abandoned and the surface will
be repaired similar to pre-drilling conditions and the locations will be using a hand-held GPS
unit.
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3.2 Groundwater Sampling Activities

H&H will contract a qualified drilling contractor to advance borings for installation of five (5)
temporary groundwater monitoring wells at the Site. Four (4) temporary monitoring wells will
be installed along the eastern and southern Site boundaries to evaluate the potential for impact to
shallow groundwater from potential upgradient off-Site sources. One (1) temporary monitoring
well will be installed in the northwestern portion of the Site to evaluate shallow groundwater in
the vicinity of a previous ECS GW-1 groundwater sample where chlorinated solvent impacts
were reported. In addition, the temporary monitoring well installed in the vicinity of the former
fuel oil UST Tank No. 3 during Phase I LSA activities will also be utilized to evaluate the
potential for impacts to groundwater from historical acid wash operations. Proposed temporary
monitoring well locations are shown in Figure 3.

The temporary groundwater monitoring well borings will be advanced with a track-mounted drill
rig capable of utilizing DPT drilling techniques. If refusal is encountered prior to reaching the
water table in a proposed temporary groundwater monitoring well location, H&H will instruct
the driller to utilize alternative drilling techniques to advance the boring to depths corresponding
to the water table. H&H anticipates the depth to water at the Site to be approximately 10 to 15 ft
bgs.

During drilling, soil cuttings will be collected and logged for lithologic description and field
screened for the presence of staining and elevated organic vapors using a calibrated PID. The
temporary monitoring wells will be constructed of 1-inch diameter PVC with 10 to 15 ft of well
screen set to bracket the water table and 1-inch diameter PVC well casing to the ground surface.
A sand filter pack will be placed from the bottom of the borings to approximately 2 ft above the
top of the well screens. The temporary wells will be completed by placing a 2 ft hydrated
bentonite seal above the sand filter pack.

The wells will be developed and purged until water quality parameters have stabilized utilizing
low-flow/low-stress methods described in Section 2.2. Once groundwater parameters stabilize,
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groundwater samples for VOC analysis will be collected directly into laboratory supplied sample
containers using the “soda straw” method to eliminate the potential for volatile compound loss
through the pump head. Samples collected for the remaining analyses will be collected directly
into laboratory supplied sample containers from the dedicated sample tubing discharge. The
sample containers will be labeled with the sample identification, date, and requested analysis,
and placed in a laboratory supplied cooler and iced. The groundwater samples will be delivered
to a North Carolina certified laboratory under standard chain of custody protocols for analyses of
VOCs by EPA Method 8260 and SVOCs by EPA Method 8270. In addition to VOCs and
SVOCs, groundwater samples collected from one proposed upgradient temporary monitoring
well and from the temporary monitoring well proposed in the former acid wash operations area
will be submitted for analysis of RCRA metals by EPA Method 6010/7471.

Following installation and sampling activities, the temporary monitoring wells will be surveyed
to estimate the top of casing and ground surface elevations in order to develop a groundwater
potentiometric surface map for the Site. After the temporary monitoring well survey has been
conducted, the temporary monitoring wells will be properly abandoned by a licensed well driller
and the surfaces will be repaired similar to pre-drilling conditions. Each groundwater sample
location will be estimated using a hand-held GPS unit.

3.3 Soil Gas Sampling Activities

H&H proposes to collect eight (8) soil gas samples within the footprints of residential buildings
proposed in the western portion of the Site to evaluate the potential for structural vapor intrusion
in the vicinity of chlorinated solvent groundwater impacts reported by ECS. The proposed
building footprints and proposed soil gas sample locations are shown in Figure 3.

The soil gas monitoring points (SGMPs) will be installed utilizing the track-mounted DPT drill
rig to advance soil borings to approximately 5 to 10 ft bgs. The SGMP borings will be advanced
to approximately 5 ft above the estimated depth to the water table. After advancing the boring to
depth, a six-inch stainless-steel vapor implant screen point fitted with ¼-inch diameter Teflon®
tubing will be installed within each borehole. Filter sand will be placed from the base of the
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boring to six inches above the screened interval. The sampling points will be completed by
placing hydrated bentonite from the top of the filter sand to the ground surface.

Prior to sample collection, a leak check will be conducted at each SGMP by constructing a
shroud around the sampling point and flooding the air within the shroud with helium gas.
Helium within the shroud will be monitored using a helium gas detector to ensure concentrations
within the shroud remain at levels near saturated conditions. Using a syringe and three-way
valve, the sample screen, sand filter pack, and sample tubing will be purged of approximately
three volumes. Vapor from the soil gas sample tubing will then be collected outside of the
shroud into a Tedlar® bag and analyzed using the helium gas detector to ensure that helium
concentrations are less than 10% of the concentration measured within the shroud.

Following a successful leak check, the soil gas samples will be collected into laboratory supplied
stainless steel Summa sample canisters connected to in-line flow controllers with a laboratory
calibrated vacuum gauge. The flow controller will be connected to the sample tubing at each
soil gas sampling point using a brass nut and ferrule assembly to form an air-tight seal. The flow
regulator will be pre-set by the laboratory to regulate the intake rate to approximately 100
milliliters per minute. Once the sample train is assembled, the intake valve on the canister will
be fully opened to begin collection of the soil gas sample. Vacuum readings on the Summa
canister will be recorded prior to and following the sampling period to ensure adequate sample
volume was collected. A vacuum will be maintained within the canisters at the conclusion of the
sampling event.

After sample collection, the intake valve will be closed, and the regulator will be disconnected
from the canister. The starting and ending vacuum in each canister will be recorded on the chain-
of-custody and submitted to the laboratory along with the samples. The Summa canisters will then
be packaged and shipped to the laboratory under chain of custody for analysis of VOCs by EPA
Method TO-15. The final vacuum in each sample canister will be measured and recorded on the
chain of custody record by the laboratory upon receipt of the samples.
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3.4 Quality Assurance – Quality Control

Non-dedicated equipment and tools will be decontaminated prior to use at each boring or
sampling location or following exposure to soil or groundwater. For quality assurance/quality
control (QA/QC) purposes, the following samples will be collected:

 One duplicate groundwater sample will be collected and analyzed for the same
parameters as the parent sample.
 One duplicate soil sample will be collected and analyzed for the same parameters as the
parent sample.
 One trip blank will accompany the groundwater samples during field activities as well as
during sample shipment. The trip blank will be analyzed for VOCs by EPA
Method 8260.
 One duplicate soil gas sample will be collected and analyzed for VOCs by EPA Method
TO-15.

Laboratory QA/QC procedures will be employed to ensure appropriate sample handling and
analysis and to aid in review and validation of the analytical data. QA/QC procedures will be
conducted in accordance with the method protocols and will include regular equipment
maintenance, equipment calibrations, and adherence to specific sample custody and data
management procedures. Samples will be analyzed in conjunction with appropriate blanks,
laboratory duplicates, continuing calibration standards, surrogate standards, and matrix spiking
standards in accordance with approved methodologies to monitor both instrument and analyst
performance. Laboratory reporting limits for each analyte will be at or below applicable DEQ
Residential screening criteria, where possible. Additionally, H&H will request that the
laboratory include estimated concentrations for compounds that are detected at levels above the
laboratory detection limit, but below the laboratory reporting limit (J flags).

The laboratory analytical data report and QA package for the samples submitted to and analyzed
by the subcontracted laboratory will be provided in an appendix to the final report. Laboratory
QA data consistent with Level II documentation will be requested for this project. A copy of the
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completed chain-of-custody record and shipping receipt will be appended to the corresponding
laboratory analytical report included with the final report.

3.5 Investigation Derived Waste

Investigation derived waste (IDW) generated during the proposed assessment activities will be
managed in general accordance with DEQ IHSB Guidelines. IDW generated during the
assessment activities will be thin spread on-Site. However, if significant impacts are suspected
(i.e., elevated PID readings, free-product, etc.) the soil cuttings will be containerized in 55-gallon
drums and staged on-Site pending analytical results of a composite IDW sample. Based on
laboratory analytical results of IDW samples, the drums will be transported off-Site to a suitable
facility for disposal.

3.6 Reporting

Following completion of the assessment activities and receipt of the analytical data, H&H will
document our findings in a Brownfields assessment report. The report will include a description
of the sampling activities, a figure depicting sample locations, soil boring logs, temporary
monitoring well construction details, soil gas monitoring point construction details, laboratory
analytical data, a discussion of the data in comparison to regulatory screening levels,
Brownfields receptor survey results, IDW manifests (if applicable), and conclusions and
recommendations concerning our activities.

0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAP
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
DERITA, NORTH CAROLINA 1996

TITLE
PROJECT
SITE LOCATION MAP
METROMONT CONCRETE FACILITY
4101 GREENSBORO STREET
CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE:
1-15-2019 0
1 MTC-00 1
SITE
SB-3
SB-4
GW-1
SB-6
SB-5/GW-4
MW-1
MW-3
MW-5
MW-4
GW-6
MW-2
REVISION NO. 0
JOB NO. MTC-001
DATE: 1-15-19
FIGURE NO. 2
METROMONT CONCRETE FACILITY
4101 GREENSBORO STREET
CHARLOTTE, NORTH CAROLINA
SITE MAP
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
GREENSBORO S
T
R
E
E
T EAST SUGAR
CREEK
ROAD
PRE-S
T
R
E
S
S
CONC
R
E
T
E
F
O
R
M
STAGI
N
G
A
R
E
A
PRE-S
T
R
E
S
S
CONC
R
E
T
E
F
O
R
M
STAG
I
N
G
A
R
E
A
SAND

B
L
A
S
T
I
N
G
BUILDI
N
G
N. TR
Y
O
N
S
T
R
E
E
T
LEGEND
SITE PROPERTY BOUNDARY
LITTLE SUGAR CREEK
MONITORING WELL
TEMPORARY MONITORING WELL
SOIL BORING
CO-LOCATED SOIL BORING /
TEMPORARY MONITORING
ABANDONED UNDERGROUND
STORAGE TANK
FORMER UNDERGROUND
STORAGE TANK
TRYON MALL CLEANER
(451 E. SUGAR CREEK ROAD)
BINGO TIRE & AUTO
(4026 N. TRYON STREET)
PALACE AUTO SALES
(4104 N. TRYON STREET)
ZOEWEE'S
(4111 N. TRYON STREET)
SUGAR CREEK TIRE & AUTO
(126 E. SUGAR CREEK ROAD)
EL NOA NOA
(215 E. SUGAR CREEK ROAD)
DINO'S
(350 E. SUGAR CREEK ROAD)
ESTRAMONTE CHIROPRACTIC
(402 E. SUGAR CREEK ROAD)
CONCRETE SUPPLY COMPANY
(3940 GREENSBORO STREET)
CONSOLIDATED PRESS
(3900 GREENSBORO STREET)
CONCRETE SUPPLY COMPANY
(3823 RALEIGH STREET)
FORMER TARMAC FACILITY
(3934 RALEIGH STREET)
FORMER ACID WASH
OPERATIONS
NOTE:
1. AERIAL IMAGERY OBTAINED FROM MECKLENBURG
COUNTY GIS (2018)
2. LOCATIONS FOR MONITORING WELLS MW-1
THROUGH MW-5 ARE APPROXIMATE BASED ON
REVIEW OF THE PHASE III GROUNDWATER
ASSESSMENT REPORT PREPARED BY ROGER AND
COLLCOTT IN MAY 1996.
3. SOIL BORING AND TEMPORARY MONITORING WELL
LOCATIONS ARE APPROXIMATE BASED ON REVIEW
OF THE PHASE II ESA REPORT PREPARED BY ECS
IN MAY 2018.
FORMER GASOLINE
UST (TANK NO.2)
FORMER BOILER FUEL
UST (TANK NO.3)
FORMER DIESEL
UST (TANK NO.1)
FORMER BOILER FUEL
UST (TANK NO.4)S:\AAA-Master Projects\Metromont\Metromont\Figures\Site Map July2018.dwg, FIG 2, 10/29/2018 3:08:06 PM, erichardson
GW-1
SB-4
SB-3
SB-6
SB-5/GW-4
MW-1
MW-3
MW-5
MW-4
GW-6
MW-2
REVISION NO. 0
JOB NO. MTC-001
DATE: 1-15-19
FIGURE NO. 3
METROMONT CONCRETE FACILITY
4101 GREENSBORO STREET
CHARLOTTE, NORTH CAROLINA
PROPOSED SAMPLE LOCATION MAP
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
NOTE:
1. AERIAL IMAGERY OBTAINED FROM MECKLENBURG
COUNTY GIS (2018)
2. LOCATIONS FOR MONITORING WELLS MW-1
THROUGH MW-5 ARE APPROXIMATE BASED ON
REVIEW OF THE PHASE III GROUNDWATER
ASSESSMENT REPORT PREPARED BY ROGER AND
COLLCOTT IN MAY 1996.
3. SOIL BORING AND TEMPORARY MONITORING WELL
LOCATIONS ARE APPROXIMATE BASED ON REVIEW
OF THE PHASE II ESA REPORT PREPARED BY ECS
IN MAY 2018.
N. TR
Y
O
N
S
T
R
E
E
T
LEGEND
SITE PROPERTY BOUNDARY
LITTLE SUGAR CREEK
MONITORING WELL
TEMPORARY MONITORING WELL
CO-LOCATED SOIL BORING /
TEMPORARY MONITORING
SOIL BORING LOCATION
PROPOSED SOIL GAS SAMPLE
PROPOSED TEMPORARY
MONITORING WELL
PROPOSED CO-LOCATED SOIL
BORING / TEMPORARY
MONITORING
ABANDONED UNDERGROUND
STORAGE TANK
FORMER UNDERGROUND
STORAGE TANK
TRYON MALL CLEANER
(451 E. SUGAR CREEK ROAD)
BINGO TIRE & AUTO
(4026 N. TRYON STREET)
PALACE AUTO SALES
(4104 N. TRYON STREET)
ZOEWEE'S
(4111 N. TRYON STREET)
SUGAR CREEK TIRE & AUTO
(126 E. SUGAR CREEK ROAD)
EL NOA NOA
(215 E. SUGAR CREEK ROAD)
ESTRAMONTE CHIROPRACTIC
(402 E. SUGAR CREEK ROAD)
CONCRETE SUPPLY COMPANY
(3940 GREENSBORO STREET)
CONSOLIDATED PRESS
(3900 GREENSBORO STREET)
CONCRETE SUPPLY COMPANY
(3823 RALEIGH STREET)
FORMER TARMAC FACILITY(3934
RALEIGH STREET)
FLOO
D
W
A
Y
DI
S
T
RI
C
T
ENCR
O
A
C
H
M
E
N
T

LI
N
E
FORMER ACID WASH
OPERATIONS
FORMER GASOLINE
UST (TANK NO.2)
FORMER HEATING OIL
UST (TANK NO.3)
FORMER DIESEL
UST (TANK NO.1)
FORMER HEATING OIL
UST (TANK NO.4)\\HHFS01\MasterFiles\AAA-Master Projects\Metromont\Metromont\Figures\Site Map July2018.dwg, FIG 3, 12/5/2018 3:48:38 PM, erichardson

Appendix A

Template Brownfields Property Receptor Survey Form

North Carolina Department of Environmental Quality
Division of Waste Management
Brownfields Program
Site:
Address:
City:
County:
Brownfields Project Number:
Property and Building Characteristics
a. Provide occupancy and use information.
c. Describe the foundation construction. Include details on type, floor construction, and depth below grade.
e. Are any subslab ventilation systems or moisture barriers in place? If so, please provide details.
% of property that is wooded/brush
If an existing building is on-site, please respond to the following. Information can be provided on additional sheets as needed. If
numerous buildings are on-site, consult with your PM as only information on specific buildings may be needed.
b. Describe the construction of the builidng including materials (e.g. wood frame, block), type and size of openings (e.g.
windows, bay doors), and height (number of stories).
% of property that is covered by buildings
BROWNFIELDS PROPERTY RECEPTOR SURVEY
This form was created to clarify and simplify preparing a receptor survey for a brownfield site. Please provide the information
requested below. Distances are measured from the site property boundary unless otherwise indicated by the DEQ Brownfield’s
Project Manager (PM).
Current Usage Proposed UsageSurface Conditions
d. Describe the HVAC system in the building. Include available details on type, equipment location, source of air return, and
design considerations (e.g. positive pressure?).
% of property that is grassed areas (unpaved)
% of property that is agricultural crops
% of property that is paved
Size of Property (acres)
Rev. 09/2015 Page 1 of 3
North Carolina Department of Environmental Quality
Division of Waste Management
Brownfields Program
Surrounding Property Land Use
North-Northwest
South
East-Northeast
West-Southwest
Utilities
Is there a septic system on-site? (Y or N)
Please provide the utility providers for the subject property
a. Natural Gas
b. Sewer
c. Electricity
d. Other
For surrounding properties, please complete the following table with available information.
Is a water line main within 100 ft of Property boundary?
Is a natural gas line main within 100 ft of the Property boundary?
Is a buried telephone/ cable main within 100 ft of the Property boundary?
Is a septic system leach field within 500 ft of the Property boundary?
Direction
Is there a basement within 1,000 ft of the Property
Distance
(ft)Address
Zoning/Land Use Proposed Usage Current Use/Occupant
Is a school or daycare center within 1,000 ft of the Property?
DirectionUtility/Potential Receptor
Is a buried electrical cable main within 100 ft of Property boundary?
Is a storm water pipe within 100 ft of the Property boundary?
* If yes, please provide a map or detailed information (distance, direction, depth) of the utility in correlation with the subject
property.
Please provide information on the following land uses in the vicinity of the subject site, including a map of the surrounding areas.
If specific receptors are present, please provide addresses of the facilities.
For the subject property, please provide a map of known buried utilites. If available, include depth to top, construction material,
and diameter of the utilities. In addition, please provide the following information on utilty providers. If additional assessment
is required, the public utility locators should be contacted. This information can then be added to a site map.
Y/N *
Specific Land Uses of Interest Y/N *
Distance
(ft)
Is a sanitary sewer within 100 ft of the Property boundary?
Is there a residence within 1,000 ft of the Property?
Rev. 09/2015 Page 2 of 3
North Carolina Department of Environmental Quality
Division of Waste Management
Brownfields Program
Water Supply
What is the potable water supply for the property? Public Private ______
Surface Water & Wetlands
Y/NWater Supply Wells
Please provide the following information regarding water supply wells in the vicinity of the Property. At a minimum, a
windshield survey within 1,500 ft of the property boundaries should be completed to determine if water supply or irrigation
wells may be present. Information from applicable databases can and should be utilized; however, should not be utilized in lieu
of the windshield survey. If multiple wells are present within the requested radius, please provide a map of the well locations. If
needed, please attach a separate table to list all wells. Please note, the PM may opt for a more extensive water supply well survey
if needed.
The purpose of this section is to provide information on the water supply for the site and surrounding areas.
Address
Provide Information regarding Surface Water and Wetlands
Are there surface water features on the property? (If yes,
please complete a. to d.)
If Private, please provide details of the water supply source (i.e. well location, well construction, etc). If public, please include the
water providers name.
Distance
(ft)Direction
a. Is the water body naturally developed or man-made?
Is a public water supply well within 1 mile of the Property boundary?
Is a private water supply well within 1,500 ft of the Property boundary?
Is an irrigation well within 1,500 ft of the Property boundary?
Response/Comments
The purpose of this section is to provide information on the presence of surface waters and/or wetlands on, or in the vicinity of
the Property.
b. List the uses of the water body.
c. What is the source of the water for the water body?
d. What is the nature of the bottom of the water body
(e.g., rocky or concrete bottom, drainage ways or
impoundments)
If no on-site surface water features, what is the nearest
surface water body?
Are there any wetlands present on the property? If no
wetlands on-site, are wetlands suspected on adjoining
properties?
Rev. 09/2015 Page 3 of 3