22025_WWAY_VIR_20220427

Geosyntec ° Geosyntec Consultants of NC, P.C.
314 Walnut Street, Suite 200
Wilmington, NC 28401
consultants PH 910.372.6402
www.geosyntec.com
Geosyntec Consultants of NC, PC
27 April 2022
Ms. Kathleen Markey
Brownfield Program Project Manager
North Carolina Department of Environmental Quality
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Subject: Soil Gas Screening Report
Site: WWAY
615 North Front Street
Wilmington, New Hanover County, North Carolina
Brownfields Project Number 22025-18-65
Dear Ms. Markey:
On behalf of 615 N Front Street LLC (the Prospective Developer [PD]), Geosyntec Consultants of
NC, P.C. (Geosyntec) has prepared this Soil Gas Screening Report for the above -referenced North
Carolina Brownfields Program (NCBP) property located at 615 North Front Street in Wilmington,
North Carolina (the "Site" or "Brownfields Property"). The North Carolina Department of
Environmental Quality (NCDEQ) approved the 20 April 2018 Brownfields Property Application
(BPA) in a 16 May 2018 Letter of Eligibility (LOE). This assessment report presents results from
the soil gas screening activities that were outlined in a 9 March 2022 Work Plan for Soil Gas
Screening (approved by NCBP on 21 March 2022) to support characterization of Site conditions
and redevelopment plans. We look forward to your review and approval of the recommendations
summarized in this report. Please do not hesitate to contact Kaitlyn Rhonehouse (910-372-6402 or
krhonehouse(cre,geosytnec.com) if you have any questions.
Sincerely,
01t�jkt
Abigail Wesley
Senior Staff Professional
Copies to:
Robert Stockel, 615 N Front Street LLC
Brian Eckel, Cape Fear Four
Michael Normandeau, Tom Watson & Co.
Kaitlyn Rhonehouse, PE (NC, VA, FL)
Principal

Prepared for
615 N Front Street LLC
1221 Arboretum Drive
Wilmington, NC 28405
SOIL GAS SCREENING REPORT
New Hanover County Parcel No. R04716-006-001-000
615 North Front Street
Wilmington, New Hanover County, North Carolina
Brownfields Project: WWAY
NCBP No. 22025-18-065
Prepared by
Geosynteccl
consultants
Geosyntec Consultants of NC, P.C.
Geosyntec Consultants of NC, P.C.
314 Walnut Street, Suite 200
Wilmington, North Carolina 28401
Project Number GN8210
April 2022

PROFESSIONAL ENGINEER SIGNATURE
I, Kaitlyn Rhonehouse, a Licensed Engineer for Geosyntec Consultants of NC, P.C., do certify
that the information in this report is correct and accurate to the best of my knowledge.
Geosyntec Consultants of NC, P.C. is licensed to practice engineering in North Carolina. The
certification number (Firm's License Number) is C-3500.
Geosyntec Consultants of NC, P.C. is licensed to practice geology in North Carolina. The
certification number (Firm's License Number) is C-295.
\CkA CAge� /r✓.�
a SEAL 7 '
043a48
1 att yn Rhonehouse, PE
Principal Engineer
North Carolina P.E. License No. 043548
Expiration Date: 31 December 2022
Geosyntec Consultants of NC, P.C.
314 Walnut Street, Suite 200
Wilmington, NC 28401
Telephone: [phone]

Geosyntec "'*
consultants
Geosyntec Consultants of NC, P.C.
TABLE OF CONTENTS
1. INTRODUCTION................................................................................................................................1
2. SITE ENVIRONMENTAL HISTORY................................................................................................1
3. SOIL GAS PROBE INSTALLATION.................................................................................................2
4. SOIL GAS SCREENING..................................................................................................................... 2
5. DISCUSSION AND CONCLUSIONS................................................................................................ 4
6. REFERENCES..................................................................................................................................... 5
LIST OF FIGURES
Figure 1 Site Location
Figure 2 Site Layout
Figure 3 March 2022 Soil Gas Screening Results
Figure 4 Proposed Redevelopment Drawings
LIST OF TABLES
Table I Soil Gas Screening Results
LIST OF APPENDICES
Appendix A Soil Boring Logs
Appendix B Soil Gas Screening Field Logs
GN8210 Soil Gas Screening Report i April 2022

Geosyntec
consultants
Geosyntec Consultants of NC, P.C.
1. INTRODUCTION
Geosyntec Consultants of NC, P.C. (Geosyntec), on behalf of 615 N Front Street, LLC (the
Prospective Developer [PD]), prepared this Soil Gas Screening Report ("the Report") for a parcel
of land located at 615 North Front Street (New Hanover County parcel ID: R04716-006-001-000),
Wilmington, North Carolina (the "Site" or `Brownfields Property" and shown on Figure 1 and
Figure 2). The total acreage of Brownfields Property is 1.6-acres. Figure 2 shows the location of
the Site and surrounding features.
The North Carolina Department of Environmental Quality (NCDEQ) approved a 19 April 2018
Brownfields Property Application (BPA) in a 16 May 2018 Letter of Eligibility (LOE; NCBP No.
2025-18-065). Geosyntec has been retained to help negotiate a Brownfields Agreement (BFA) for
the Site, including the evaluation of soil gas conditions to help in redevelopment planning. This
Report provides results and recommendations from the soil gas screening activities conducted at
the Site, which was performed in general accordance with the Work Plan for Soil Gas Screening,
submitted on 9 March 2022 and approved by NCBP on 21 March 2022. The objectives of the soil
gas screening were to supplement existing soil gas data and assess the presence of methane in the
areas of the proposed building footprint where soil will not be removed as part of redevelopment.
2. SITE ENVIRONMENTAL HISTORY
The Site is currently vacant and is zoned for commercial use. The Site was originally developed
and used by the railroad in the late 1880s through 1960s. According to previous reports, the
majority of the parcel was comprised of a repair building that contained a foundry, machine shop,
oil storage areas, and other activities associated with railroad car repair. In the 1960s the building
was demolished. In 1969, the former WWAY building was constructed at the Site and was used
as a television broadcasting station. The WWAY building was razed in 2018, and the Site has not
been redeveloped since.
Multiple site investigations and remedial activities have been previously conducted by several
parties. Previous testing at the Site by Geosyntec and others indicates that groundwater and soil
beneath portions of the Site are impacted with volatile organic compounds (VOCs), semi -volatile
organic compounds (SVOCs) and/or metals. Detections of VOCs in soil gas were reported in
previous site assessments; however, according to others, the Soil Gas to Indoor Air pathway risk
is not exceeded (ASE, 2021). The Site -related environmental impacts stem from either off -site or
previous on -site activities that are no longer ongoing and are unrelated to the PD. A more detailed
Site history and summary of assessment work completed to date at the Site is summarized in
separate reports prepared by Atlantic Shores Environmental Services, Ltd (ASE) and Geosyntec
and submitted to NCBP. ASE's Phase II Environmental Site Assessment soil gas sampling
locations are shown on Figure 2.
GN8210 Soil Gas Screening Report 1 April 2022

Geosyntec
consultants
Geosyntec Consultants of NC, P.C.
The WWAY Brownfield site is currently owned by 615 N Front Street, LLC. Geosyntec
understands the PD intends to redevelop the Site for future retail and multi -family development
and associated parking. Geosyntec and the PD understand that elevated methane concentrations
have been detected in the soil gas at nearby sites; therefore, the PD proactively elected to conduct
methane screening to evaluate if methane mitigation may be required as part of future building
construction. Note, no methane source or impacts were previously identified. Additionally, we also
note that a substantial portion of the Site is planned to be excavated up to depths of 25 feet below
ground surface (ft bgs); therefore, the assessment discussed herein was focused on areas where no
cut is planned and where potential methane sources, if present, could remain (Figures 2 and 3).
No development or construction has been completed by the PD to date.
3. SOIL GAS PROBE INSTALLATION
On 28 March 2022, Geosyntec and its subcontractor, Catlin Engineers and Scientists (Catlin),
installed 5 soil gas probes (SGP-1 through SGP-5) in the areas of the building footprint where soil
will not be excavated (Figure 2).
Prior to the start of work, Geosyntec prepared a site -specific Health and Safety Task Hazard
Analysis in general accordance with the Occupation Safety and Health Administration (OSHA)
rules (29 CFR 1910.120). To address potential underground utilities, Geosyntec contacted the
North Carolina 811 one -call system a minimum of 72 business hours before beginning the
assessment to notify member utilities of the subsurface work.
Soil gas probes were installed at approximately 4.5 ft bgs in borings advanced using direct push
technology (DPT) by a North Carolina -licensed driller. Each soil gas probe consisted of 1/4-inch
diameter Nylaflow® tubing connected with a compression fitting to a 1/4-inch-diameter, 6-inch-
long stainless -steel sampling probe. Geosyntec supplied both the Nylaflow tubing and soil gas
probes. Probes were installed inside each borehole and a sand filter pack was placed in the annulus
to a height approximately 6 inches above the top of the screen. Granular bentonite was then be
placed in 6 inches lifts and hydrated with distilled water after each lift to seal the remainder of the
borehole to ground surface. The top of the probe was fitted with a compression -fit brass ball valve
to maintain an air -tight seal between installation and sampling. The soil gas probes were allowed
to equilibrate for at least two hours prior to purging. Soil boring logs are provided in Appendix A.
4. SOIL GAS SCREENING
On 29 and 31 March 2022, Geosyntec performed soil gas purging and screening in general
accordance with the NCDEQ Brownfields Program Methane Assessment Protocol (NCDEQ,
2020). Prior to purging, a shut-in test was completed to confirm that the sampling train did not
have evidence of leaks. Static pressure of each soil gas probe was also collected using a Landtec
GN8210 Soil Gas Screening Report 2 April 2022

Geosyntec
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Geosyntec Consultants of NC, P.C.
GEM 5000. During soil gas screening, at least three liters of soil gas were purged and collected
into 1-liter Tedlar bags. The purged soil gas was screened for the presence of volatile organic
compounds (VOCs) using a MiniRAE 3000 photoionization detector (PID) and for carbon dioxide,
methane, and oxygen using a Landtec GEM 5000 multi -gas meter. A helium shroud was also used
during screening as a leak check for outdoor air being introduced into the samples. Additionally,
soil gas probe SGP-2 was rescreened approximately 2 hours after its initial purge, in lieu of a
"duplicate" sample, to confirm the precision of the field equipment. Soil gas screening field logs
are provided in Appendix B.
The results of the field screening are summarized on Table 1, illustrated on Figure 3, and
discussed below:
• Total VOCs (PID Readings)
o Total VOCs were detected by PID at all five soil gas probes. The highest detection
was recorded from SGP-5, at 41.2 parts per million (ppm), and the lowest was
recorded from SGP-1 at 0.8 ppm. VOCs in soil gas are discussed further in Sections
2 and 5.
• Fixed Gases
o Methane was not detected at any of the soil gas probe locations. Concentrations
above 0.0 percent by volume (% vol) were not reported during purging/screening
at SGP-1 through SGP-5.
o Carbon dioxide concentrations ranged from 0.1% vol (SGP-2 "duplicate") to 2.1%
vol (SGP-5). Carbon dioxide in atmospheric air is generally less than 0.1% vol;
therefore, the carbon dioxide concentrations, reported at 0.1 % by vol and above,
provide a line of evidence that the soil gas sampling probes were adequately sealed
from potential atmospheric air entrainment. Furthermore, shut in tests and a helium
shroud (discussed further below) were employed during purging which also
evidence that atmospheric air is not interfering with the integrity of the sample.
o Oxygen was detected below 20% vol, at probes SGP-4 and SGP-5 during screening
activities and between 20-21% vol at probes SGP-1 through SGP-3. Although
atmospheric oxygen levels are generally around 20-21 % vol, the oxygen
concentrations from SGP-1 through SGP-3 may be suggestive of oxygenated
shallow soil gas and are not necessarily indicative of atmospheric air entrainment.
Overall, the oxygen field screening data, when also considered in combination with
the carbon dioxide results, successful shut-in tests, and helium tracer gas results
(see below), provide confidence in the integrity of the soil gas sampling process.
• Static Pressure
o Static pressure (measured in inches of water) was measured, using a GEM 5000, at
all locations prior to purging each soil gas probe. Static pressure measurements
GN8210 Soil Gas Screening Report 3 April 2022

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Geosyntec Consultants of NC, P.C.
ranged from -0.03 inches of water (SGP-1) to 0.06 inches of water (SGP-5). These
subsurface static gas pressures are generally considered to be negligible.
• Helium Tracer Gas
o A helium shroud was used during screening as a leak check for atmospheric air
being introduced into the samples. The shroud was placed over the sample probe
and most of the sample train and filled with helium. The helium concentration
inside the shroud was measured using an MGD 2002 Helium Leak Detector. During
purging the helium concentration in the shroud ranged from approximately 2% vol
to approximately 25% vol. During screening, the helium concentration in the Tedlar
bag containing the purged soil gas was also measured. Helium in the Tedlar bag
was not detected above 0 ppm during purging at any of the soil gas probes,
indicating that atmospheric air was not entrained during purging. The absence of
helium in the purged soil gas provides confidence that the soil gas probes were
adequately sealed, and that atmospheric air was not entrained into the samples.
Field screening data are summarized on Table I and field forms are provided in Appendix A.
5. DISCUSSION AND CONCLUSIONS
Five soil gas probes were installed and screened in March 2022. Methane was not detected during
field screening. VOC concentrations were detected at all probe locations (SGP-1 through SGP-5).
However, as discussed in Section 2, soil gas samples were previously collected for laboratory
analysis of VOCs in 2021. The VOC concentrations reported via U.S. EPA Method TO-15 were
screened against NCDEQ Division of Waste Management Residential Sub Slab and Exterior Soil
Gas Screening Levels and run through the NCDEQ Risk Calculator (January 2021 version).
According to ASE, the Soil Gas to Indoor Air pathway risk was not exceeded based on the reported
VOC concentrations (ASE, 2021).
Additionally, excavation (ranging from 19 to 25 ft bgs) is proposed across most of the Site (Figure
2). Furthermore, as shown on Figure 4, the first floor of the redevelopment is proposed to comprise
of an open-air parking structure and commercial retail space. Residential apartments will be
located on the second or higher floors; therefore, the appropriate risk screening scenario is
commercial/industrial. This provides additional confidence related to the potential risk associated
with VOCs.
The presence of methane was not detected during this evaluation, and prior soil gas investigations
indicated VOC laboratory analytical results did not exceed risk for the Soil Gas to Indoor Air
pathway. Therefore, Geosyntec does not recommend further soil gas sampling or mitigation
associated with vapor intrusion risk to occupants. At this time, we propose to move forward with
GN8210 Soil Gas Screening Report 4 April 2022

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Geosyntec Consultants of NC, P.C.
drafting of the BFA for the property using previously collected soil and groundwater data
(submitted by others) and preparation of the Environmental Management Plan (EMP).
6. REFERENCES
Atlantic Shores Environmental Services, Ltd., 2021. Phase II Environmental Site Assessment.
Brownfields Project Number: 20025-18-65. August 10.
Geosyntec, 2022. Work Plan for Soil Gas Screening. New Hanover County Parcel No. R04716-
006-001-000. NCBP No. 22025-18-065. March 9.
GN8210 Soil Gas Screening Report 5 April 2022

FIGURES

mml

Hanover Street
s
t
4
SGP-1
Y
SG-1
O �
Y
SGP-2
Af .
1
SSG-2
- O 1i1
OL �'� SGP-3
r
go SG-2
SSG-1
SG-3 SGP-4
y Yw
fO..
SGP-5 Z
t
80 40 0 80 Feet
Site Boundary Proposed June 2021 Soil
Ground Floor Gas Sampling
Former UST Building Extent Location
Area
Proposed March 2022 Soil Site Layout
®Unexcavated Gas Probe
Area Locations 615 North Front Street Wilmington, NC
Notes:
1. Aerial imagery provided by ArcMap10.8, ESRI
2. Parcel Boundary obtained from New Hanover County, NC online GIs database. GeoS tec Geosyntec Consultants of NC, P.C.
3. UST indicates underground storage tank. NC License No.: C-3500 and C-295 Figure
4. The Former UST Area is approximate. consultants
5. June 2021 sampling locations were obtained from the Phase II Environmental 2
Site Assessment prepared by Atlantic Shores Environmental Services, Ltd, dated 10
August 2021. Wilmington, NC April 2022

SGP-1
Initial Methane Maxium VOCs
Pressure Concentration (by PID)
-0.03 0.0 17.6
�V
Val
111A alk
SGP-2
Initial
Methane
Maxium VOCs
Pressure
Concentration
(by PID)
0.01
0.0
18.3 *
SGP-3
Initial
Methane
Maxium VOCs
Pressure
Concentration
(by PID)
0.03
0.0
12.2
SGP-4
Maxiutn
Initial Pressure Methane VOCs
Concentration (by PID)
0.00 0.0 28.2
//i
1
SGP-5
Maxium
Initial Pressure Methane VOCs
Concentration (by PID)
0.06 0.0 41.2
2022 Soil Gas Ground Floor
Probe Location Building Extent
Site Boundary Unexcavated
® Area
Former UST
Area
Notes:
1. Aerial imagery provided by ArcMap10.8, ESRI
G 2. Parcel Boundary obtained from New Hanover County, NC online GIs database.
3. UST indicates underground storage tank.
8 4. The Former UST Area is approximate.
v 5. Initial pressure and methane readings were obtained using a GEM 5000
manufactured by Lantec.
p 6. VOC indicates volatile organic compound.
iz 7. Maximum VOC readings were obtained using a photoionization detector
(MiniRAE 3000).
8. * the maximum VOC concentration detected at SGP-2 was recorded during its
second purge.
1
O Hanover StrE
moo'
*,
Probe ID
Maxiurn
Initial Pressure Methane VOCs
Concentration (by PID)
inches ofwater % by vol une parts per
million
40 0 80 Feet
March 2022 Soil Gas Screening Results
615 North Front Street
Wilmington, NC
Ge o syntec Geosyntec Consultants of NC, P.C. consultants Figure
NC License No.: C-3500 and C-295
3
Wilmington, NC April 2022

Residential Apartments
VIEW NORTH ALONG FRONT ST.
I III �
�Parkin
First or Retail Space
VIEW SOUTH ALONG NUTT ST.
Notes:
1. The design development drawings are generated by
LS3P Associates, Ltd., dated 6 December 2021, and were
provided by Cape Fear Commercial.
2. The drawings are schematic and not to scale.
3. The proposed first floor is comprised of open air parking
and retail space.
4. Residential apartments are proposed to be on the
second floor or higher.
Residential Apartments
First Floor Retail Space
Proposed Redevelopment Drawings
615 North Front Street
Wilmington, NC
GeosMtec°
consultants
Wilmington, NC
Geosyntec Consultants of NC, P.C. Figure
NC License No.: C-3500 and C-295
4
April 2022

TABLE

Table 1
Soil Gas Screening Results
615 North Front Street
Wilmington, NC
Geosyntec
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Geosyntec Consultants of NC, P.C.
Stabilized
Stablized Carbon
Probe Depth
Methane
Dioxide
Stabilized Oxygen
Maximum
Initial Pressure
Probe ID
(feet BLS)
Date Screened
Concentration
Concentration
Concentration
VOCs (ppmv)
(inches H2O)
(% by volume)
(% by volume)
(% by volume)
SGP-1
4.5
3/29/2022
0.0
0.8
20.8
17.6
-0.03
SGP-2
4.5
3/31/2022
0.0
0.2
20.3
9.7
0.01
SGP-2*
4.5
3/31/2022
0.0
0.1
20.9
18.3
--
SGP-3
4.5
3/31/2022
0.0
0.4
20.2
12.2
0.03
SGP-4
4.5
3/31/2022
0.0
1.2
19.3
28.2
0.0
SGP-5
4.5
3/31/2022
0.0
2.1
18.2
41.2
0.06
Notes:
1. BLS indicates below land surface
2. Stabilized concentrations were obtained from the soil gas collected in a 1-liter Tedlar bag after at least 2 liters of soil gas had been purged (unless otherwise noted)
3. Methane, carbon dioxide, oxygen, and initial pressure measurements were obtained using a GEM5000 lanfill gas analyzer manufactured by Landtec
4. * indicates a "duplicate" screening; SGP-2 was re -screened approximately 2 hours after initial screening
5. VOCs indicates Volatile Organic Compounds
6. ppmv indicates parts per million by volume
7. VOCs concentrations were obtained using a MiniRAE 3000 photoionization detector (PID)
8. -- indicates not measured
1 of 1

APPENDIX A

Geosyntec Consultants
Boring Log
GeosMtec
consultants
DRILLING CO.: CATLIN
SITE: 615 N Front Street
Boring ID: SGP-1
DRILLER: Swain/Chambers
PROJECT NO.: GN8210
Sheet: 1 Of 1
DRILLING METHOD: DPT
DATE STARTED: 28 Mar 2022
Borehole Location Sketch Map / Reference
See attached map
RIG: Geoprobe
DATE FINISHED: 28 Mar 2022
BIT DIAMETER/TYPE: 2"
SUPERVISOR: A. Wesley
SAMPLE METHOD: Cont. PHOTO TAKEN: No
Lithology Log
Depth USCS / Rock
Run Rec SPT / Notes / Sample ID / Water
Time
ft (bls) [Secondary/PRIMARY soil type, color, moisture, trace content, Type
(No.) (%) RQD Level
density/consistency, plasticity, grain size]
0-0.5
0945
Fill, tan sand w/ gravel clasts (<1"), dry
1
0.5-4
Brown, poorly graded, medium and, moist
SP
1
4-5
Dark brown, well graded fine to coarse sand with
SW
2
gravel (<0.25") and silt, moist
Boring terminated at 5 ft bgs
Probe set at —4.5-5 ft bgs
Sand: 3.8-5 ft bgs
Seat: 0-3.8 ft bgs

Geosyntec Consultants
Boring Log
GeosMtec
consultants
DRILLING CO.: CATLIN
SITE: 615 N Front Street
Boring ID: SGP-2
DRILLER: Swain/Chambers
PROJECT NO.: GN8210
Sheet: 1 Of 1
DRILLING METHOD: DPT
DATE STARTED: 28 Mar 2022
Borehole Location Sketch Map / Reference
See attached map
RIG: Geoprobe
DATE FINISHED: 28 Mar 2022
BIT DIAMETER/TYPE: 2"
SUPERVISOR: A. Wesley
SAMPLE METHOD: Cont. PHOTO TAKEN: No
Lithology Log
Depth Time USCS / Rock
Run Rec SPT / Notes / Sample ID / Water
ft (bls) [Secondary/PRIMARY soil type, color, moisture, trace content, Type
(No.) (%) RQD Level
density/consistency, plasticity, grain size]
0-0.5
1010
Fill, tan sand w/ gravel clasts (<1"), dry
1
0.5-1
Dark brown, well graded fine to coarse sand with
SM
1
gravel (<0.25") and silt, moist
1-4
Beige and dark brown, poorly graded, medium
SP
]
sand, moist
4-5
Same as above
SP
2
Boring terminated at 5 ft bgs
Probe set at —4.5-5 ft bgs
Sand: 3.5-5 ft bgs
Seal: 0-3.5 ft bgs

Geosyntec Consultants
Boring Log
GeosMtec
consultants
DRILLING CO.: CATLIN
SITE: 615 N Front Street
Boring ID: SGP-3
DRILLER: Swain/Chambers
PROJECT NO.: GN8210
Sheet: I Of 1
DRILLING METHOD: DPT
DATE STARTED: 28 Mar 2022
Borehole Location Sketch Map / Reference
See attached map
RIG: Geoprobe
DATE FINISHED: 28 Mar 2022
BIT DIAMETER/TYPE: 2°
SUPERVISOR: A. Wesley
SAMPLE METHOD: Cont. PHOTO TAKEN: No
Lithology Log
Depth USCS / Rock
Run Rec SPT / Notes / Sample ID / Water
Time
ft (bls) [Secondary/PRIMARY soil type, color, moisture, trace content, Type
(No.) (%) RQD Level
density/consistency, plasticity, grain size]
0-1
Silty soil with bricks
SM
1
1-4
Poorly graded, beige, medium sand, moist
SP
1
4-5
1045
Same as above, moist
SP
2
Boring terminated at 5 ft bgs
Probe set at--4.5-5 ft bgs
Sand: 3.5-5 ft bgs
Seal: 0-3.5 ft bgs

Geosyntec Consultants
Boring Log
GeosMtec
consultants
DRILLING CO.: CATLIN
SITE: 615 N Front Street
Boring ID: SGP-4
DRILLER: Swain/Chambers
PROJECT NO.: GN8210
Sheet: 1 of 1
DRILLING METHOD: DPT
DATE STARTED: 28 Mar 2022
Borehole Location Sketch Map / Reference
See attached map
RIG: Geoprobe
DATE FINISHED: 28 Mar 2022
BIT DIAMETER/TYPE: 2"
SUPERVISOR: A. Wesley
SAMPLE METHOD: Cont. PHOTO TAKEN: No
Lithology Log
Depth Time USCS / Rock
Run Rec SPT / Notes / Sample ID / Water
ft (bls) [Secondary/PRIMARY soil type, color, moisture, trace content, Type
(No.) (%) RQD Level
density/consistency, plasticity, grain size]
Hitting refusal —3ft bgs
0-0.5
Sandy fill with gravel clasts (<1 ")
1
(likely concrete. Offset to
the SE)
0.5-4
Dark brown & beige, poorly graded sand with clay.
SP
1
Dark brown sections are more silt/clay bearing,
brick fragments (<2")
4-5
1100
Same as above, moist
SP
2
Boring terminated at 5 ft bgs
Probe set at--4.5-5 ft bgs
Sand: 3.5-5 ft bgs
Seal: 0-3.5 ft bgs

Geosyntec Consultants
Boring Log
GeosMtec
consultants
DRILLING CO.: CATLIN
SITE: 615 N Front Street
Boring ID: SGP-5
DRILLER: Swain/Chambers
PROJECT NO.: GN8210
Sheet: 1 Of 1
DRILLING METHOD: DPT
DATE STARTED: 28 Mar 2022
Borehole Location Sketch Map / Reference
See attached map
RIG: Geoprobe
DATE FINISHED: 28 Mar 2022
BIT DIAMETER/TYPE: 2°
SUPERVISOR: A. Wesley
SAMPLE METHOD: Cont. PHOTO TAKEN: No
Lithology Log
Depth USCS / Rock
Run Rec SPT / Notes / Sample ID / Water
Time
ft (bls) [Secondary/PRIMARY soil type, color, moisture, trace content, Type
(No.) (%) RQD Level
density/consistency, plasticity, grain size]
0-0.5
Topsoil, dark brown, moist, silty sand with grass
1
0.5-4
Tan/orange, poorly graded medium sand, moist
SP
1
4-4.5
Dark brown/black gravel, dry (asphalt?)
GM
2
4.5-5
Well graded, brown sand, fine to coarse grained, moist
SW
2
Boring terminated at 5 ft bgs
1116
Probe set at —4.5-5 ft bgs
Sand: 3.5-5 ft bgs
Seal: 0-3.5 ft bgs

APPENDIX B

GeosynLL;c
SOIL GAS PROBE MEASUREMENTS
2501 Blue
[phone]
conswianis
Ro.430
RidRaleigh NC'te 276077
Fax [phone]
rr
10 Project Name: l I'D R—Ka Probe No.: ❑ Sub -slab probe
k
Date: )A ax ZZ— Project Number O U Mini Rae 2000 Serial No.: w�
Site Location' ! Landtech GEM 2000 Landfill Gas Meter Serial No. M: i Yt�- `
Weather: �S MDG 2002 Helium detector Serial No.: _� 1 �'"
Field Personnel: MNCA Tracer Gas: Helium ❑ Other
Recorded By:
Soil gas probe
Lamp: 10.6 / 1 1.7 eV
f 2-
c�,
Q2 Surface Type: ❑ Asphalt E] Concrete ❑ Grass � OtheZ& i
Surface Thickness inche entimeters ❑ Unknown
(i.e., asphalt or concrete)
� 1 Casing Volume
7
05 Shut in test prior to pneumatic test completeo� in. H2O held ior) ecands.
❑ Sub -slab
<0.1 L j
Soil gas probe L' 1 (L)
©S of Pneumatic Test:
�
Elapsed Time
(min,)
Pump
Flaw to
-� )
Well Head
Vacuum
in. H2O
`
® Initial Pressure (prior to pumping) �—D �3 in. H2O l."�
_
Q7 Field tubing blank reading (ppmv) completed? �&s ❑ No PID Reading n !7 ppm
0.1
0.2
oo
0.5
© Shut in test prior to purging completed? Yes No ❑
09 Purging
Tracer Gas
VOCs
Date
Start
Time
End
Time
Elapsed
Time
(min.)
Bag
Volume
(L)
Purge
Rate
(LPM)
Cumulative
Volume
(L)
CH,
N
CO2
M
02
(%)
Shroud (o)
Sample
(ppm, %)
(circle one)
by PID
(ppmv)
Min
A, Max
A-2-
6916
0
1
0. 2
6_ v
0.5
�2_c -'1
13
S
9 tft_2-z
Q 5A
1)-2—
,
C • (5
.' , l7
�•
l�
1
0.0
0,6
, 0
3. p-
1-1
o
o.
10 Helium cone n ation in field screened samples is less than 5% of minimum concentration in
the shroud? Y,,Yes ❑ No Note: 1 % helium = 10,000 ppmv
11 Shut in test prior to sample collection mpleted? Yes
[ No ❑
12 Sample Collection
Dattet
Start/End Time
Sample ID
Summa Canister ID
Flow Controller
#
Initial Flow
mL/min
Batch Cert ID
Initial Vacuum
(in. Hg)
Final Vacuum
(in. Hg)
1V
)1 t1
L p
E �'e Lai, atitf >l fit•
a Comments:
E
i,

Geosym,c1>
at ;"-
SOIL GAS PROBE MEASUREMENTS
consultants
2501 Blue Ridge Road. Suite 430
Raleigh, NC 27607
[phone] Fax[phone]
1Q Project Name
Date: _S l Hour
Site Location:
Weather: o
Field Personnel: ipm otw ❑
Recorded By: �+-►
Probe No.: �y ❑ Sub -slab probe
Project Number: Mini Rae 2000 Serial No.: Ql'i1 a O'zF oZ g01dA
Landtech GEM 2000 Landfill Gas Meter Serial No. M: 371
MDG 2002 Helium detector Serial No.: ?i he_ `D S1 �0 Iq
Tracer Gas: 1� Helium ❑ Other
100,
" Soil gas probe
. Lamp: 10.6 / 11.7 eV
2
Q2 Surface Type: ❑Asphalt ❑ Concrete ❑ Grass [M Othe D1
Surface Thickness 0/centimeters ❑ Unknown
(i.e., asphalt or concrete)
1 Casing Volume
05 Shut in test prior to pneumatic test completedr20 in. H2O held fo)—�econds.
❑ Sub -slab
<0.1 L
Soil gas probe (L)
© Start of Pneumatic Test:
Elapsed i
(min.)
Pu�Rp�ote
Flow
�pin.
Well Head
Vacuum
H2O
4 Initial Pressure (prior to pumping) n. H O
(p P P g)_ z
07 Field tubing blank reading (ppmv) completed?
Wes El No PID Reading ppmv
.1
0.2
0.5
�
© Shut in test prior to purging completed? Yes.
No El
® Purging
Tracer Gas
Date
Start
Time
End
Time
Elapsed
Time
(min.)
Bag
Volume
(L)
Purge
Rate
(LPM)
Cumulative
Volume
(L)
CH,
M
CO2
M
02
R
Shroud (%)
Sample
Wpm, %)
(circle one)
VOCs
by PID
(ppm')
Min
Max
St 2_2_
e)
oa59_
\
fl
0•0
p-2
2A-2
:f P'Z,
®
q,
1 h W2-:1-
b 5'1
o a
t52
V(D
d 2
3
a• 3
1NO-2-2-
�Od3
tone
0 2
3
b
ID• 3
, A
31M 2L
1zt
5
p.2
Q.�
U-2-2-
=ram'• ,
-V
e
a2lo
0Z
u
C'' �-
®
ITco a ion in field screened samples is less than 5 0 of minimum conce �trafiorr in
the shroud? Yes ❑ No Note: 1 % helium = 10,000 ppmv
11 Shut in test prior sampl 011 collection completed? eted? Yes
No ❑ r
14 Sample Collection
Date
Start/End Time
ID
Summa Canister ID
oniroller #
Initial Flow
mL/min
Batch Cert ID
Initial Vacuum
(in. Hg)
Final Vacuum
(in. Hg)
E
Comments:

GeosynL,C C'
SOIL GAS PROBE MEASUREMENTS
consultants
Road.430
2501 Blue Ridge Raleigh, NC'te 27607
[phone] Fax[phone]
1Q Project Name`: , 1� �� Probe No.: -� ❑Sub -slab probe Soil gas probe
Dater 1[� Project Number: �8 �-i� Mini Rae 2000 Serial No.: Z Lamp: 10.6 / 11.7 eV
Site Location: LLB Landtech GEM 2000 Landfill Gas Meter Serial No, M:T�32 <y\,Zt7,
Weather: MDG 2002 Helium detector Serial No.:�� V T
Field Personnel: Tracer Gas: V Helium ❑ Other
Recorded By:
O2 Surface Type: ❑ Asphalt ❑ Concrete ❑ Grass ❑ Other
Surface Thickness. inches/centimeters ❑ Unknown
(i.e., asphalt or concrete)
Q 1 Casing Volume
O Shut in test prior to pneumatic test completed in. H2O held for "econds.
❑ Sub -slab
<0.1 L
Soil gas probe (L)
©Start of Pneumatic Test:
Ekxpsed
(min.)
Pump
Flaw to
PM)
Well Head
Vacuum
in. H2O
® Initial Pressure (prior to pumping) p, p3 in. H2O
07 Field tubing blank reading (ppm,) completed? t7kes ❑ No
PID Reading 'D ppm
l
0.2
0.5
® Shut in test prior to purging completed? Yes No ID
Q9 Purging
Tracer Gas
Date
Start
Time
End
Time
Elapsed
Time
(min.)
Bag
Volume
(L)
Purge
Rate
(LPM)
Cumulative
Volume
(L)
CH,
(%)
CO2
(%)
02
N
Shroud (%)
Sample
(ppm," %)
(circle one)
VOCs
by PID
(ppmv)
Min
Max
u2.6
11i D2'b
O•Z
0 l7
0Jf
20•1
- --
v
.•2'
M Z2
1n llb
ID,53
5
8 Z
2
p, 0
aA 2
.1
25,(D
.
2z
0 3
0 3
1
3
LO
C? •
20 • Z
•10
'"Z
D
2
10 Helium r_ancen ration in field screened samples is less than 5% of minimum concentration in 11 Shut in test prior to s pie colleclion co , leted? Yes No ❑
the shroud? Yes [] No Note: 1 % helium = 10,000 ppmv
12 Sample Collection
Date
Start/End Time
le ID
Summo Canister ID
Flow Controller #
Batch Cert IDMin
Initial Vacuum
(in. Hg)
Final Vacuum
(in. Hg)
J.
E
a Comments:

Geosym ,� 0
SOIL GAS PROBE MEASUREMENTS
consultants
2501 Blue Ridge Road, Suite 430
Raleigh, NC 27607
[phone] Fax[phone]
0 Project Name: C 1 S n'�
Date-
Site Location. C
Weather: Ds
Field Personnel:
Recorded By:
Probe No.: SC-.% Q — y" C7, ❑n Sub -slab probe
Project Numbe �Z1 Mini Rae 2000 Serial No.: 1Y��' �—`► l�
Landtech GEM 2000 Landfill Gas Meter Serial No. M:
MDG 2002 Helium detector Serial No.:
Tracer Gas: w Helium ❑ Other
0 Soil gas probe
Cr Lamp: 10.6 / 11.7 eV
LO Z
02 Surface Type: ❑ Asphalt ❑ Concrete ❑ Grass
Surface Thickness ches centimeters
(i.e., asphalt or concrete)
Y �' Othe t>1
❑ -Unknown
® 1 Casing Volume
Q5 Shut in test prior to pneumatic test completeQ2D in. H2O held for-Oeconds.
❑ Sub -slab
<0.1 L L
Soil gas probe (L)
© Start of Pneumatic Test:
Elapsed Time
( min.)
Flo
�dl
Well Head
Vin.acuum
2 O
® Initial Pressure (prior to pumping) in. H2O
Q7 Field tubing blank reading (ppm) completed?
ram,
Yes ❑ No PID Reading - p ppmv
0.2
0.5
® Shut in test prior to purging completed? Yes 1ANo ❑
09 Purging
Tracer Gas
Date
Start
Time
End
Time
Elapsed
Time
(min.)
Bag
Volume
(L)
Purge
Rate
(LPM)
Cumulative
Volume
(L)
CH,
(%)
CO2
M
02
(%)
Shroud I%)
Sample
(ppmv- %)
(circle one)
VOCs
by PID
(ppmv)
Min
Max
31"P-z2-
Lb 1.
\ l 0 \
0, e'�_
k
0
31q4'q-22
1101
110
• 7—
0 • 0
1 - 2
k
01
0- - -1
2al
• -I
1N.2z
-
O
Z
11
A-1
' 20
(�
2c�•2
10 Helium concentration in field screened samples is less than 5% of minimum concentration in
the shroud? [R Yes El No Note: 1 % helium = 10,000 ppmv,
11 Shut in test prior to s
mple colleclian cem ted? Yes
No ID
12 Sample Collection
Date
Start/End Time
Srsn�p
Summa Canister ID
FI
Initial Flo
mL/min
Batch Cert ID
Initial Vacuum
(in. Hg)
Final Vacuum
(in. Hg)
s
a
r
F
Comments:
E
r;

Geosym,'.
SOIL GAS PROBE MEASUREMENTS
consultants
2501 Blue Ridge Road. Suite 430
Raleigh, NC 27607
[phone] Fax[phone]
Project Name: Probe No.: — ElSub-slabprobe
Date: 21 1—►olr 2 1) l� Project Number: I�b 2kb Mini Rae 2000 Serial No.:
Site Location: Landtech GEM 2000 Landfill Gas Meter Serial No. M. ��-
MDG 2002 Helium defector Serial No.:
Weather: n� b � 1
Field Persolnnel:'
Recorded Tracer Gas: .Helium ❑ Other
V
Soil gas probe
Lamp: 10.6 / 11.7 eV
0 Surface Type: ❑ Asphalt ❑ Concrete ❑ Grass ] Oth D
Surface Thickness 'nche /centimeters ❑ Unknown
(i.e., asphalt or concrete)
1 Casing Volume
WZt
in test prior to pneumatic test completed in. H2O held for econds.
❑ Sub -slab
<0.1 L
Soil gas probe 4t
y (L)
©Start Pneumatic Test:
e Elapsd i
(min.)
Pump
ale
jLPM)
Well Head
Vacuum
in. H2O
��yy ,,,,
® Initial Pressure (prior to pumping) in. H2O
07 Field tubing blank reading (ppmv) completed? [)QYes El No PID Reading , ' L ppm
0.1
0.2
0.5
® Shut in test prior to purging completed? Yes No ❑
Q Purging
Tracer Gas
Date
Start
Time
End
Time
Elapsed
Time
(min.)
Bag
Volume
(L)
Purge
Rate
(LPM)
Cumulative
Volume
(L)
CH,
M
CO2
(%)
02
M
Shroud (%)
Sample
(ppm, %)
(circle one)
VOCs
by PID
(ppm )
v
Min
Max
D• 2
1
D
2.2
1�6 S.
o
N 2
3.
N a
b
-� 2
-I
10 Helium concentration in field screened samples is less than 5% of minimum concentration in 11 Shut in test prior to s mple
the shroud? Yes ❑ No Note: 1% helium=10,000 ppm�
llectian com ted? Yes
v1 Y
L�4 No ❑
TTT'"'
12 Sample Colle _tion
Date
Start/End Time
Sample ID
Canister
low Controller #
mL/min Initial Flow
Batch Cert ID
Initial Vacuum
(in. Hg)
Final Vacuum
(in. Hg)
- Comments: