25077_Raleigh Ice Center_Assessment WP with approval_20220525

From: Graham, Stephanie J
To: Bo Cappleman
Cc: Mary Katherine Stukes; ion(fteacondevelopment.com; Eckard, Sharon; Maggie Houston; Walker Gorham; Steve
Hess
Subject: Raleigh Ice Center (BF Project #25077-21-092) - Work Plan Approval
Date: Tuesday, June 21, 2022 3:52:00 PM
Attachments: ima.e�Dno
Hi Bo— The Brownfields Assessment Work Plan for Raleigh Ice Center (Hart & Hickman, 5/25/2022) is
approved.
Please let me know if you have any questions.
Thanks,
Stephanie
Stephanie Graham
Brownfields Project Manager
Division of Waste Management — Brownfields Program
INC Department of Environmental Quality
Office: 704-235-2195
Mobile: [phone]
610 East Center Avenue, Suite 301
Mooresville, NC 28115
EQO%

Via Email
May 25, 2022
North Carolina Department of Environmental Quality
Division of Waste Management — Brownfields Program
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Attn: Ms. Stephanie Graham
Re: Brownfields Assessment Work Plan
Raleigh Ice Center
912 Hodges Street
Raleigh, Wake County
Brownfields Project No. 25077-21-092
H&H Job No. BCP-159
Dear Stephanie:
hart 'ti• hickman
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SMARTER ENVIRONMENTAL SOLUTIONS
1.0 Introduction and Background
#C-1269 Engineering
#C-245 Geology
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On behalf of BIN -Hodges, LLC, Hart & Hickman, PC (H&H) is pleased to present this Work Plan
to conduct Brownfields assessment activities at the Raleigh Ice Center Brownfields property located
at 912 Hodges Street in Raleigh, Wake County, North Carolina (Site or subject Site). A Site
location map is provided as Figure 1.
The Site consists of one parcel of land (Parcel ID No. 1715117286) that is approximately 13.28
acres. The western portion of the Site is improved with an approximate 33,750-square foot (sq ft)
commercial building and associated parking lots and driveways. The building is primarily vacant
but includes a small area of leased offices. A portion of a gravel storage yard in the east -central
portion of the Site is used for trailer parking. The eastern portion of the Site consists of wooded
land. Hodges Street bisects the northwestern portion of the Site, which is a vacant parking lot. A
Site map is presented as Figure 2.
2923 South Tryon Street, Suite 100 3921 Sunset Ridge Rd, Suite 301
Charlotte, NC 28203 Raleigh, NC 27607 www.harthickman.com
704.586.0007 main 919.847.4241 main

Ms. Stephanie Graham
May 25, 2022
Page 2
The Site consisted of primarily undeveloped wooded/cleared land with Crabtree Creek located in the
northwestern portion of the Site as of at least 1938. In the early to mid-1970s, the central and
western portions of the Site were cleared, portions of the western portion of the Site including
Crabtree Creek were filled, and Crabtree Creek was straightened to its current configuration along
the northern Site boundary. In 1979, the current commercial building, associated parking lots, and
an access road were constructed in the western portion of the Site. The building was utilized as a
night club from at least 1979 until the late 1990s. In the early 2000s, the building was used as a
skating rink that was converted to an ice hockey/skating rink in 2005-2006. The ice rink operated
until 2020. In the 2000s, an outdoor hockey rink and a lacrosse field were developed in the east -
central portion of the Site and appear to have operated until the mid- to late 2010s. In the late 2010s,
the east -central portion of the Site was used as a construction equipment storage yard. The former
construction yard has been used as a semi -trailer parking lot since 2021.
In 2011, EnviroAssessments performed Phase II Environmental Site Assessment (ESA) soil and
groundwater sampling activities to evaluate potential impacts from undocumented fill material on
the Site. The results indicated that volatile organic compounds (VOCs), including 1,2-
dichloroethane (1,2-DCA) and methyl tert-butyl ether (MTBE), and metals were detected in
groundwater at concentrations above the North Carolina 2L Groundwater Standards (2L Standards).
The sample location map that was provided in the 2011 Phase II ESA report is unclear; however, it
appears that the groundwater samples were collected in the western and west -central portions of the
Site.
In March and April 2021, H&H performed Phase II ESA soil, groundwater, and soil gas sampling
and methane screening activities at the Site. Eight soil samples, four groundwater samples, and six
sub-slab/exterior soil gas samples were collected for laboratory analysis. In addition, 12 soil gas
monitoring points were installed to screen potential fill areas at the Site for the presence of methane.
A summary of the Phase II ESA results is provided as follows:
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Soil
• Wood debris was observed in soil boring SB-1 at a depth interval of approximately 13-15 ft
below ground surface (bgs). Asphalt debris was observed in boring B-12 at a depth interval
of approximately 6-8 ft bgs. No obvious debris was observed in borings SB-2 through SB-4
or B-1 through B-4.
• Soil analytical data did not indicate the presence of VOCs or semi-VOCs (SVOCs) at
concentrations above the North Carolina Department of Environmental Quality (DEQ)
Protection of Groundwater, Residential, or Industrial/Commercial Preliminary Soil
Remediation Goals (PSRGs). Metals detections in soil samples are consistent with published
regional background levels and/or below the PSRGs.
Groundwater
• Groundwater analytical data indicate that the VOCs 1,2-DCA (9.9 µg/L) and MTBE
(480 µg/L) were detected in sample TMW-4 at concentrations above the 2L Standards of
0.4 µg/L and 20 µg/L, respectively. Groundwater sample TMW-4 was collected in the
central portion of the Site.
• No SVOCs or metals were detected in groundwater samples TMW-1 through TMW-4 at
concentrations above the 2L Standards.
Sub -Slab and Exterior Soil Gas
• 1,1,2,2-tetrachloroethane (3.16 µg/m3) and benzene (12.4 µg/m3) were detected in exterior
soil gas sample SG-1 at concentrations above the DEQ Residential Sub -Slab Vapor and
Exterior Soil Gas Screening Levels (SGSLs) of 1.6 µg/m3 and 12 µg/m3, respectively. The
detected concentrations are below the respective Non -Residential SGSLs of 21 µg/m3 and
160 µg/m3.
• 1,3-Butadiene was detected in exterior soil gas sample SG-3 at a concentration of
80.4 µg/m3, which exceeds the Non -Residential SGSL of 41 µg/m3. Benzene (26.5 µg/m3)
was also detected in sample SG-3 at a concentration above the Residential SGSL of 12 µg/m3
but below the Non -Residential SGSL of 160 µg/m3.
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• 1,3-Butadiene (29.1 µg/m3) was detected in exterior soil gas sample SG-4 at a concentration
above the Residential SGSL of 3.1 µg/m3, and benzene (12 µg/m3) was detected in sample
SG-4 at a concentration equal to the Residential SGSL of 12 µg/m3. The detected
concentrations are below the respective Non -Residential SGSLs of 41 µg/m3 and 160 µg/m3.
• No VOCs were detected in exterior soil gas sample SG-2 or sub -slab vapor samples SSV-1
and SSV-2 at concentrations above the Residential or Non -Residential SGSLs.
• The results of cumulative risk calculations for sample SG-3 indicate a non -carcinogenic
Hazard Index (HI) for a residential scenario of 1.2, which exceeds the acceptable HI of 1.0.
The calculated Lifetime Incremental Cancer Risk (LICR) for a residential scenario using
sample SG-3 data is 2.8 x 10', which is below the acceptable risk level of 1 x 10-4. The
calculated carcinogenic and non -carcinogenic risk levels are below acceptable risk levels for
a non-residential exposure scenario.
• The calculated carcinogenic and non -carcinogenic risk levels for the remaining soil gas
samples (SG-1, SG-2, and SG-4) and sub -slab vapor samples SSV-1 and SSV-2 are below
the DEQ acceptable risk levels for residential and non-residential exposure scenarios. As
such, there does not appear to be a VOC vapor intrusion concern for the western portion of
the Site where fill material was placed in the early to mid-1970s and 2000s.
Methane Screening
• The results of the methane gas screening activities indicate that methane was measured at
monitoring point SG-2/SG-2A at levels ranging from 59% to 91.2% by volume air (bv),
which exceeds the Lower Explosive Limit (LEL) of 5%.
• Methane was not detected or was measured at levels within the margin of error of accuracy
for the Landtec GEM 5000 instrument of 0.5% at monitoring points SG-5, SG-7, SG-8, SG-
9, and SSV-2, which were located north, south, southwest, west, and northwest of SG-2/2A.
• Differential pressure readings collected from the two soil gas monitoring points with
detectable concentrations of methane (i.e., SG-2/2A and SG-6) indicated a maximum
differential pressure of 0.631 inches of water, which is within the margin of error for the
Landtec GEM 5000 instrument of 2.0 inches of water. Therefore, the localized area of
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methane gas located east of the Site building appears to be stable and not under significant
pressure.
On September 17, 2021, Moore & Van Allen, PLLC submitted a Brownfields Property Application
to the DEQ Brownfields Program on behalf of the Prospective Developer (PD), BIN-
HODGES LLC. Due to DEQ's backlog of Brownfields projects and to address potential data gaps
and assist with the PD's due diligence prior to development of the Brownfields property, H&H
conducted supplemental vapor intrusion assessment activities at the Site in November 2021. A
Letter of Eligibility was ultimately issued by DEQ on December 22, 2021 after the field work was
complete. A summary of the results of the November 2021 vapor intrusion assessment activities is
provided below.
Sub -Slab and Exterior Soil Gas
• H&H collected one sub -slab soil gas sample (SSV-3) within the existing building. Acrolein
was detected in sub -slab vapor sample SSV-3 at a concentration above the Residential SGSL
but below the Non -Residential SGSL. No other VOCs were detected above the SGSLs in
sub -slab vapor sample SSV-3.
• H&H installed five permanent exterior soil gas monitoring points (SG-3A, SG-4A, SG-25,
SG-26, and SG-28) for collection of samples for VOC analysis. Soil gas monitoring points
SG-3A and SG-4A were installed in the central area of the Site to confirm previous
detections of 1,3-butadiene in previous samples SG-3 and SG-4. Soil gas monitoring points
SG-25, SG-26, and SG-28 were installed near the proposed apartment building in the eastern
portion of the Site.
• Low levels of 1,3-butadiene, acrolein, benzene, and ethylbenzene were detected in at least
one exterior soil gas sample at concentrations that exceed the Residential SGSLs but are
below the Non -Residential SGSLs. The detected concentrations of 1,3-butadiene in exterior
soil gas samples SG-3A and SG-4A are notably lower than previous detections in SG-3 and
SG-4 during the March 2021 sampling event. No other VOCs were detected in the exterior
soil gas samples at concentrations exceeding the Residential SGSLs.
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• According to the article Problematic Compounds in Vapor Intrusion Investigations by Bart
Eklund, 1,3-butadiene is typically detected as a result of friction and off -gassing from o-rings
and other components of drilling equipment. Therefore, it is unlikely that 1,3-butadiene
would be found in a follow-up sample collected from the same monitoring point because it
does not persist in soil. Acrolein is often detected in samples with polar compounds such as
acetone and methyl ethyl ketone, both of which were detected in samples collected from the
Site. The article indicates that 1,3-butadiene and acrolein should be assumed to be false
positives. Based on this information, 1,3-butadiene and acrolein should not be considered as
part of vapor intrusion risk evaluation.
• Risk calculator results using combined soil gas data for the eastern samples indicate the
cumulative non -carcinogenic HI exceeds the acceptable risk level for a residential exposure
scenario but is below the acceptable risk level for a non-residential exposure scenario. The
cumulative carcinogenic risk using combined soil gas data for the eastern samples is below
acceptable levels for both residential and non-residential exposure scenarios. Excluding 1,3-
butadiene and acrolein detections, which are likely sampling artifacts, the results of risk
calculations using the eastern sample data show that carcinogenic and non -carcinogenic risk
levels are below acceptable risk levels for both residential and non-residential exposure
scenarios.
• Risk calculator results using combined data for the western samples indicate cumulative
carcinogenic and non -carcinogenic risk levels are below the acceptable levels for both
residential and non-residential exposure scenarios.
Methane Screening
• H&H performed methane screening activities at 22 exterior soil gas monitoring locations.
Methane was present at concentrations greater than the LEL of 5% by volume at eight of the
22 locations (SG-10, SG-12, SG-15, SG-16, SG-18, SG-20, SG-22, and SG-33) where
methane screening was performed during the November 2021 assessment. The methane
detections at screening locations SG-12, SG-15, SG-16, SG-18, SG-20, and SG-33 also
exceeded the DEQ Brownfields 30% by volume methane initial residential use guidance
level.
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• All of the locations at which methane was detected in excess of the LEL were located in the
vicinity of the proposed western apartment building.
• Debris or organics were identified in methane screening borings SG- 11 (14-15 ft), SG-15
(3.25-11 ft), SG-16 (11-11.5 ft), SG-19 (7.5-8 ft), SG-20 (7-7.5 ft), and SG-33 (3.5-11 ft).
The debris was generally limited to isolated depth intervals. The most significant debris was
observed in a suspected fill area located east-southeast of the current commercial building.
• No methane was detected at sub -slab vapor monitoring point SSV-3 or previous sub -slab
vapor monitoring points SSV-1 or SSV-2.
• The highest differential pressure measurement at the Site (0.61 inches of water) is within the
accuracy limits for the Landtec GEM 5000 instrument of 2.0 inches of water and is
considered negligible. As such, the negligible pressure at the Site is likely not sufficient to
move large volumes of methane in soil gas to the surface at potentially explosive levels at the
Site and should be considered acceptable for residential use.
• Although the results of the supplemental vapor intrusion assessment show a potential
methane vapor intrusion concern for the western portion of the Site, the negligible
differential pressure measured across the Site is likely not sufficient to allow methane to
migrate to a building foundation at potentially explosive levels. In addition, the results of
sub -slab vapor sampling indicate insignificant levels of VOCs and no methane in vapor
beneath the existing building slab.
Prior sample locations are shown on Figure 2.
The PD plans to redevelop the Site with two multi -family apartment buildings. On March 22, 2022,
a kick-off/data gap meeting was held with H&H, the PD, the PD's legal counsel, and DEQ
Brownfields Program personnel to discuss Site history, previous environmental assessment,
proposed redevelopment plans, data gaps, and a proposed schedule for completing the Brownfields
Agreement. This work plan describes proposed assessment activities to address data gaps identified
during the kick-off meeting and in an email from DEQ dated April 12, 2022. The proposed soil,
sediment, surface water, and vapor intrusion assessment activities are summarized in the following
sections. In addition to the data gaps that will be assessed under this work plan, DEQ Brownfields
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requested additional methane screening be performed at the base of excavations after structurally
unsuitable fill material is removed during grading. Methane screening locations are unclear at this
time and will be provided for DEQ Brownfields approval at a later date. The additional methane
screening will be performed in general accordance with methods previously used by H&H during
2021 methane assessment.
The proposed scope of work for Brownfields assessment activities is provided in the sections below.
2.0 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 July 2021, the DEQ Division of Waste Management (DWM) Vapor Intrusion Guidance dated
March 2018, and the most recent versions of the U.S. EPA Region IV Region IV Lab Services and
Applied Sciences Division (LSASD) Field Branches Quality System and Technical Procedures
guidance. The proposed sample locations and analyses are summarized in Table 1, and the proposed
sampling locations are shown on Figure 3.
Prior to conducting field activities, H&H will contact North Carolina 811 One -Call, the public utility
locator service, to mark subsurface utilities at the Site. H&H will also team with a private utility
locator to identify and mark locations of sub -grade utilities at the Site that may not be marked by the
public locator. Additionally, each boring location will be hand cleared to approximately 5 ft below
ground surface (bgs) to further screen the boring locations for the presence of subsurface utilities.
2.1 Soil Assessment Activities
H&H proposes to collect three grab soil samples (SB-5 through SB-7) to evaluate shallow soil
conditions on the northern portion of the Site across Hodges Street and one composite soil sample
(COMP-1) on the eastern wooded portion of the Site. The proposed shallow soil sample locations
are depicted on Figure 3.
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H&H will direct a drilling contractor to advance the soil borings to an estimated depth of 5 ft bgs
using a decontaminated stainless -steel hand auger. Continuous soil samples will be retrieved from
the borehole, logged for lithologic description, observed for visual and olfactory evidence of
impacts, and screened for the presence of volatile organic vapors with a calibrated photoionization
detector (PID). One grab soil sample from borings SB-5 through SB-7 will be collected from
approximately 1-3 ft bgs for laboratory analysis unless field screening indicates obvious soil impacts
between 3 and 5 ft bgs.
Sample COMP-1 will be collected as a composite sample consisting of three aliquots (one aliquot
from each of three proposed boring locations within the eastern portion of the Site) at a depth
interval of approximately 0 to 2 ft bgs. Soil sample aliquots from each boring will be homogenized
to form a composite soil sample representative of soil from 0 to 2 ft bgs.
Following collection, the 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 for shipment to a North Carolina -certified laboratory under
standard chain of custody protocols. Soil samples will be analyzed for VOCs by EPA Method 8260,
semi-VOCs (SVOCs) by EPA Method 8270, Resource Conservation and Recovery Act (RCRA)
metals by EPA Methods 6020/7471, and hexavalent chromium by EPA Method 7199.
Following sampling, the soil borings will be properly abandoned using hydrated bentonite, and the
ground surface will be restored to match approximate pre -drilling conditions.
2.2 Sediment and Surface Water Sampling
H&H proposes to collect two surface water samples from the unnamed pond located in the
southwestern portion of the Site. Both samples (SW-1 and SW-2) will be collected from the
northern portion of the pond, which is accessible from the developed portion of the Site.
Additionally, two surface water samples (SW-3 and SW-4) will be collected from the wetland
located in the eastern portion of the Site. Sample SW-3 will be collected from the downgradient
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(northwestern) portion of the wetland, and sample SW-4 will be collected from the upgradient
(southern) portion of the wetland. The locations of the proposed surface water samples are depicted
on Figure 3.
H&H will utilize water quality meters to collect measurements of pH, temperature, dissolved
oxygen, oxidation reduction potential, turbidity, and specific conductivity of surface water at the
sample locations. Following collection of field measurements, the surface water samples will be
collected directly into laboratory provided sample containers or via a decontaminated, stainless -steel
scoop.
H&H will collect four sediment samples (SED-1 through SED-4) co -located with the surface water
samples. Sediment samples will be collected using a decontaminated stainless -steel dredge sampler
or hand auger. Sediment samples will be collected in laboratory -supplied sample containers. The
locations of the proposed sediment samples are depicted on Figure 3.
The sample containers will be labeled with the sample identification, date, and requested analysis,
and placed in a laboratory supplied cooler with ice. The samples will be delivered 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, RCRA metals by EPA Method 6010/7471, and
hexavalent chromium by EPA Method 7199. In addition, surface water samples will be submitted
for analysis of hardness by Standard Method 2340B to calculate North Carolina surface water
standards for metals which are hardness dependent.
Upon completion of sampling, the surface water and sediment sample locations will be estimated
using a hand-held GPS unit.
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2.3 Soil Vapor Sampling Activities
To further evaluate the potential for vapor intrusion into the proposed eastern apartment building,
H&H proposes to install and collect samples from five temporary soil vapor monitoring points (SG-
34 through SG-38) that will be installed within the footprint of the proposed building. Three
additional temporary soil gas vapor monitoring points (SG-39 through SG-41) will be installed on
the portion of the Site located north of Hodges Street to evaluate the potential for vapor intrusion
into possible future buildings in the northwestern portion of the Site. Note that no buildings are
currently proposed for this portion of the Site. The proposed soil gas monitoring points are shown
on Figure 3. A discussion of the proposed sampling activities is provided below.
The proposed soil gas monitoring points will be installed to depths of approximately 5 to 5.5 ft bgs
using a stainless -steel decontaminated hand auger. During boring advancement, continuous soil
samples will be collected from each boring from the center of the hand auger bucket. The soil
samples will be logged for lithologic description, inspected for the presence of visual and olfactory
indication of potential impacts, and screened for the presence of volatile organic vapors with a
calibrated PID.
After advancing the boring to depth, a 6-inch stainless -steel screen point fitted with 1/4-inch diameter
Teflon® tubing will be placed at the bottom of each borehole. The annular space around the screen
will be filled with filter sand to a depth of approximately 6 inches above the vapor screen.
Following installation of the sand, hydrated bentonite will be installed in the boring from the top of
the sand to the ground surface.
During previous assessments, shallow perched water or groundwater was detected during attempts to
install soil gas monitoring points within the proposed eastern building footprint. Should water be
encountered prior to reaching a depth of 5 ft bgs in borings SG-34 through SG-38, groundwater
samples will be collected from two borings within the proposed eastern building footprint to provide
data for a vapor intrusion evaluation. Further details regarding groundwater sampling are included
in Section 2.4.
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Prior to sample collection, a "shut-in" test will be conducted on the sampling train and helium leak
checks will be conducted at each sampling point. The purpose of the shut-in test and helium leak
check described below are to minimize the potential for short circuiting with ambient air during
sampling. A description of the shut-in test and helium leak testing procedures is provided below.
The shut-in test will be conducted by connecting the flow regulator with the vacuum gauge to the
Summa® canister and sealing the flow regulator with the laboratory provided brass cap. Once the
sampling train is "closed", the sample valve on the Summa® canister will be opened and the reading
on the vacuum gauge will be recorded. The Summa® canister sample valve will then be closed, and
the vacuum gauge will be observed to ensure no vacuum loss occurs. If the vacuum reading remains
the same, the shut-in test will be considered successful. If vacuum loss occurs, the flow regulator
and/or brass cap will be reconnected, and the shut-in test will be repeated until the vacuum reading
remains stable.
Following a successful shut-in test, a leak check will be conducted by constructing a shroud around
the sample train at each sampling point and flooding the air with helium gas. Helium concentrations
inside the shroud will be measured using a calibrated helium gas detector and maintained at
concentrations of approximately 10% to 20% for the duration of the leak check. Using a syringe and
three-way valve, a minimum of three sample train volumes will be purged at a maximum flow rate
of 200 mL/min, and a sample will be collected from the sample tubing outside the shroud into a
Tedlar bag and analyzed using the helium gas detector to ensure that helium concentrations are less
than 10% of the helium concentrations measured within the shroud.
Following a successful field leak check, the vapor samples will be collected into laboratory -supplied
batch -certified 1-liter Summa 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
vapor monitoring 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. The intake valve on the canister will be fully opened to begin collection of the sub -slab
soil vapor sample. Vacuum readings on the Summa canister will be recorded prior to and following
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the sample period to ensure adequate sample volume was collected. A vacuum will be maintained
within the canisters at the conclusion of the sampling event.
After completion of sampling, the intake valve will be closed and the regulator will be disconnected
from the sample canister. The starting and ending vacuum in each canister will be recorded on the
chain -of -custody and submitted to a laboratory along with the samples. The Summa canisters will
then be packaged and shipped to a nationally accredited laboratory under standard chain of custody
protocols for analysis of VOCs by EPA Method TO-15.
2.4 Groundwater Sampling Activities
To evaluate potential impacts to groundwater from historical on -Site and off -Site operations, H&H
proposes to install two temporary groundwater monitoring wells (TMW-5 and TMW-6) on the
portion of the property north of Hodges Street and one temporary groundwater monitoring well
(TMW-7) on the eastern, wooded portion of the Site. TMW-5 and TMW-6 will be co -located with
soil boring locations SB-5 and S13-7, respectively. As discussed in Section 2.3, shallow perched
water or groundwater was encountered during previous soil gas sampling on the eastern portion of
the Site. Should water be encountered during the soil gas monitoring point installations in the
eastern portion of the Site, up to two additional temporary groundwater monitoring wells (TMW-8
and TMW-9) will be advanced in lieu of soil gas sampling. The approximate locations of the
proposed temporary wells are shown on the sample location map, which is presented as Figure 3.
The temporary monitoring wells will be advanced using a DPT rig to estimated depths of up to
approximately 20 ft bgs. Final well construction depths will be dependent on observed depth to
groundwater (estimated at approximately 5-10 ft bgs) in the field. The temporary monitoring wells
will be constructed of 1-inch diameter PVC with 10 or 15 ft of pre -packed well screen (due to
sampling for metals) set to bracket the water table and 1-inch diameter PVC well casing to the
ground surface. A sand filter pack will extend from the bottom of the borehole to approximately 2 ft
above the top of the pre -packed well screens, followed by at least 2 ft of hydrated bentonite.
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The temporary monitoring wells will be developed by removing a minimum of 3 to 5 well volumes
and observing stable field parameters (i.e., pH ± 0.1 SU and conductivity varies no more than 5%).
After development, a groundwater sample will be collected utilizing low flow/low stress purging
techniques using a peristaltic pump and disposable polyethylene tubing. The intake point of the
pump tubing will be placed approximately in the 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 a
water quality meter to measure pH, temperature, dissolved oxygen, oxidation reduction potential,
turbidity, and specific conductivity at 3 to 5-minute intervals during purging. Purging will be
considered complete when water quality parameters stabilize (i.e., pH ± 0.1 SU, conductivity varies
no more than 5%, and turbidity is less than 10 NTUs).
Once groundwater parameters stabilize, groundwater samples from the temporary monitoring wells
will be collected directly into laboratory supplied sample containers. VOC samples will be collected
using the "soda straw" method to minimize volatile loss through the peristaltic pump head. The
sample containers will be labeled with the sample identification, date, and requested analysis, and
then placed in a laboratory -supplied cooler with ice. The samples will be delivered 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 by EPA Methods 6020/7470.
Upon completion of groundwater sampling activities, the temporary monitoring wells will be
surveyed and depth to groundwater information will be collected. Groundwater sample locations
will be recorded in the field using a hand-held GPS unit. The temporary monitoring wells will then
be properly abandoned by a licensed well driller and surfaces will be repaired to generally match
pre -drilling conditions.
2.5 Quality Assurance/Quality Control Samples
The following samples will be collected for quality assurance/quality control (QA/QC) purposes:
• One duplicate soil sample will be collected and analyzed for the same parameters as the
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parent sample (i.e., VOCs by EPA Method 8260, SVOCs by EPA Method 8270, RCRA
metals by EPA Method 6020/7471, and hexavalent chromium by EPA Method 7199).
• One duplicate sediment sample will be collected and analyzed for the same parameters as the
parent sample (i.e., VOCs by EPA Method 8260, SVOCs by EPA Method 8270, RCRA
metals by EPA Method 6020/7471, and hexavalent chromium by EPA Method 7199).
• One duplicate surface water sample will be collected and analyzed for the same parameters
as the parent sample (i.e., VOCs by EPA Method 8260, SVOCs by EPA Method 8270, and
RCRA metals by EPA Method 6020/7470).
• One duplicate groundwater sample will be collected and analyzed for the same parameters as
the parent sample (i.e., VOCs by EPA Method 8260, SVOCs by EPA Method 8270, and
RCRA metals by EPA Method 6020/7470).
• One trip blank will accompany each shipment of water samples (e.g., groundwater and/or
surface water) submitted for VOC analysis during sampling and shipment. The trip blank
will be analyzed for VOCs by EPA Method 8260.
• H&H will collect one duplicate exterior soil gas sample using a "T" sample connection
which will allow for the collection of two soil gas samples from the same location
simultaneously. The duplicate soil gas sample will be analyzed for VOCs by EPA Method
TO-15.
Non -dedicated equipment and tools will be decontaminated prior to use at each boring or sampling
location, or following exposure to soil, sediment, groundwater, or surface water.
Laboratory QA/QC procedures will be employed to ensure appropriate sample handling and analysis
and to aid in the 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 appropriate screening criteria, where possible. Additionally, H&H
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will request that the laboratory include estimated concentrations for compounds that are detected at
levels above the laboratory method detection limit, but below the laboratory reporting limit (J Flags).
A copy of the laboratory analytical data report and QA package for each group of 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 completed chain -of -custody record and shipping receipt will be appended to the
corresponding laboratory analytical report included with the final report.
2.6 Investigation Derived Waste
Based on the prior data, investigation derived waste (IDW) generated during the assessment
activities will be thin spread on -Site in accordance with North Carolina regulation
15A NCAC 02T.1503 and 15A NCAC 02T.0113. However, if significant impacts are suspected, the
IDW will be containerized in 55-gallon drums and staged on -Site pending analytical results of
composite IDW samples. Based on laboratory analytical results of IDW samples, the drums will be
transported off -Site to a permitted facility for disposal, if needed.
2.7 Brownfields Receptor Survey
H&H will perform a Brownfields receptor survey in accordance with DEQ Brownfields Section
guidance. The receptor survey will include information about land use and zoning in the Site area.
In addition, H&H will 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 Site. In addition, H&H will review Wake County records to identify registered water supply
wells in the area and, if warranted, contact the utility companies for information concerning
underground utilities in the immediate area of the Site. The receptor survey will be completed using
the most current version of the Brownfields Property Receptor Survey form.
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2.8 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, a discussion of the data
in comparison to regulatory screening levels, risk calculations, laboratory analytical data, receptor
survey results, and conclusions and recommendations concerning our activities.
We look forward to your approval of this work plan. Should you have any questions or need
additional information please do not hesitate to call me at [phone].
Sincerely,
Hart & Hickman, PC
Bo Cappleman, PG
Due Diligence Manager
cc: Jon Morris, Walker Gorham, and Maggie Houston, BIN -Hodges, LLC (via email)
Mary Katherine Stukes, Moore & Van Allen, PLLC (via email)
Attachments
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Table 1
Proposed Sampling Plan
Raleigh Ice Center
912 Hodges Street
Raleigh, North Carolina
H&H Job No. BCP-159
Sample ID
Sample Depth (ft bgs)
Sample Objective/Location
Analyses
VOCs
SVOCs
RCRA Metals
Hexavalent Chromium
Hardness
EPA 8260D
F EPA TO-15
EPA 8270E
EPA 6020/7470/7471
EPA 7199
SM 2340B
Soil Samples
SB-5
1-3(l)
Evaluate soil conditions in the current parking area north of Hodges Street
X
X
X
X
SB-6
1-3(l)
X
X
X
X
SB-7
1-3(l)
X
X
X
X
SB-8
0-2(l)
Evaluate soil conditions in the eastern, wooded portion of the Site
X
X
X
X
Field Duplicate
1 1-3(l)
1 QA/QC
X
X
X
X
Surface Water Samples
SW-1
N/A
Evaluate surface water quality in the pond on the southwestern portion of the Site
X
X
X
X
X
SW-2
N/A
X
X
X
X
X
SW-3
N/A
Evaluate surface water quality in the downgradient portion of the wetland located on the
eastern portion of the Site
X
X
X
X
X
SW-4
N/A
Evaluate surface water quality in the upgradient portion of the wetland located on the
eastern portion of the Site
X
X
X
X
X
Field Duplicate
N/A
QA/QC
X
X
X
X
X
Sediment Samples
SED-1
0-1
Evaluate sediment conditions within the pond on the southwestern portion of the Site
X
X
X
X
SED-2
0-1
X
X
X
X
SED-3
0-1
Evaluate sediment conditions in the downgradient portion of the wetland located on the
eastern portion of the Site
X
X
X
X
SED-4
0-1
Evaluate sediment conditions in the upgradient portion of the wetland located on the
eastern portion of the Site
X
X
X
X
Field Duplicate
0-1
QA/QC
X
X
X
X
Soil Gas Samples
SG-33
5-5.5
Evaluate the potential for VOC vapor intrusion into the proposed eastern Site building
X
SG-34
5-5.5
X
SG-35
5-5.5
X
SG-36
5-5.5
X
SG-37
5-5.5
X
SG-38
5-5.5
Evaluate the potential for VOC vapor intrusion into potential future buildings in the
northwestern portion of the Site (none currently proposed)
X
SG 39
5-5.5
X
SG-40
5-5.5
X
Field Duplicate
5-5.5
QA/QC
I
X
Groundwater Samples
TMW-5
5-15
Evaluate groundwater conditions in the northwestern (downgradient) portion of the Site
across Hodges Street
X
X
X
TMW-6
5-15
X
X
X
TMW-7
5-15
Evaluate groundwater conditions in the eastern wooded portion of the Site
X
X
X
TMW-8 c2)
5-15
At SG-34 location should perched/shallow groundwater be encountered.
X
X
X
TMW-9 c2)
5-15
At SG-37 location should perched/shallow groundwater be encountered.
X
X
X
Field Duplicate
1 5-15
1 QA/QC
X
X
X
Notes:
VOCs = volatile organic compounds; SVOCs = semi -volatile organic compounds; RCRA = Resource Conservation and Recovery Act; QA/QC = quality assurance/quality control;
SB = soil boring; TMW = temporary monitoring well; SG = soil gas; ft bgs = feet below ground surface
(1) Soil sample depth could vary based on the results of field screening. If no obvious field evidence of soil impacts is identified, a sample will be collected from the depth interval shown on the table above.
(2) TMW-8 and TMW-9 will only be installed if perched or shallow groundwater is encountered during soil gas sampling activities on the eastern portion of the Site.
Table 1 (Page 1 of
11)
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TITLE
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0 2,000 4,000 SITE LOCATION MAP
PROJECT
n I V SCALE IN FEET RALEIGH ICE CENTER
912 HODGES STREET
U.S.G.S. QUADRANGLE MAP RALEIGH, NORTH CAROLINA
2923 South Tryon Street - Suite 100
RALEIGH WEST, NORTH CAROLINA2013 hart '1• hickman Charlotte, North Carolina28203
RALEIGH EAST, NORTH CAROLINA 2013 Livens # C-1 69 Boa--245 Geology
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SMARTER ENVIRONMENTAL SOLUTIONS License # C-1269 / # G245 G0o10gy
3 QUADRANGLE DATE: 2-22-21 REVISION NO: 0
7.5 MINUTE SERIES (TOPOGRAPHIC) JOB NO: BCP-159 FIGURE NO: 1