23010_Raleigh Union Bus_AWP_20200612

Brownfields Data Gap Assessment Work Piz -
Raleigh Union Station (RUS) Bus Station
200, 206, 210 S. West Street
Raleigh, Wake County, North Carolina
June 12, 2020
Terracon Project No. 70187342
Brownfield Project ID: 23010-19-092
4 Le-- �-� �-- ��
Analee L. Farrell, El
Staff Environmental Ewi*OP*#4,.
Michael T. Jord
Senior Geolo t v
��
Terracon Consultants, Inc. 2401 Brentwood Road, Suite 107 Raleigh, North Carolina 27604
P [phone] F [phone] terracon.com

June 12, 2020
Mr. Tony Duque
NCDEQ — Division of Waste Management
Brownfields Program
1646 Mail Service Center
Raleigh, NC 27699-1646
Subject: Brownfields Data Gap Assessment Work Plan
Raleigh Union Station (RUS) Bus Station
200, 206, 210 S. West Street
Raleigh, Wake County, North Carolina
Terracon Project No. 70187342
Brownfield Project ID: 23010-19-092
Dear Mr. Duque:
Irerracon
Terracon Consultants, Inc. (Terracon), on behalf of GoTriangle is pleased to submit this
Brownfields Work Plan for the proposed redevelopment of the Raleigh Union Station (RUS)
Bus Station located in Raleigh, North Carolina (the "site"). The site will be managed under
the North Carolina Department of Environmental Quality (NCDEQ), Division of Waste
Management (DWM) Brownfields Program (Project ID: 23010-19-092).
If you have any questions regarding the Work Plan, please do not hesitate to contact us at
919-873-2211.
Sincerely,
Terracon Consultants, Inc.
Analee Farrell, El
Staff Environmental Engineer
Michael T. Jo an, PG, RSM
Senior G oaist
Terracon Consultants, Inc. 2401 Brentwood Road, Suite 107 Raleigh, North Carolina 27604
P [phone] F [phone] terracon.com

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station (RUS) Bus Station
200, 206, 210 S. West Street
Raleigh, Wake County, North Carolina
June 12, 2020
Terracon Project No. 70187342
Brownfield Project ID: 23010-19-092
Prepared for:
GoTriangle
Raleigh, North Carolina
Prepared by:
Terracon Consultants, Inc.
Raleigh, North Carolina

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 Terracon Project No. 70187342
TABLE OF CONTENTS
1.0 INTRODUCTION.............................................................................................................1
1.1 SITE LOCATION.................................................................................................1
1.2 SITE DESCRIPTION AND HISTORY..................................................................1
1.3 HISTORICAL ON -SITE OPERATIONS...............................................................1
1.4 HISTORICAL SITE INVESTIGATIONS...............................................................2
1.5 SITE REGULATORY STATUS............................................................................3
1.6 SUMMARY AND DATA GAP EVALUATION......................................................3
2.0 WORK PLAN FOR ADDITIONAL ASSESSMENT..........................................................4
2.1 HEALTH AND SAFETY PLAN............................................................................4
2.2 UTILITY LOCATION AND GPR/EM ASSESSMENT...........................................4
2.3 SOIL SAMPLING.................................................................................................5
2.4 GROUNDWATER SAMPLING............................................................................6
2.5 SOIL VAPOR SAMPLING...................................................................................7
3.0 QUALITY CONTROL/QUALITY ASSURANCE..............................................................9
4.0 INVESTIGATION DERIVED WASTE MANAGEMENT...................................................9
5.0 REPORTING.................................................................................................................10
6.0 REFERENCES..............................................................................................................10
EXHIBITS
Exhibit 1 Topographic Vicinity Map
Exhibit 2 Proposed Development Area
Exhibit 3 Historical On -site Sample Location Map and Overview of Areas of Concerns
Exhibit 4 Proposed Sample Location Map
TABLES
Table 1 Historical Soil Analytical Results
Table 2 Historical Groundwater Analytical Results
Table 3 Proposed Sample and Analysis Plan
Responsive Resourceful Reliable iv

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2010 ■ Terracon Project No. 70187342
1.0 INTRODUCTION
Terracon Consultants, Inc. (Terracon), on behalf of GoTriangle, prepared this data gap
assessment and work plan to summarize historical environmental investigations at the parcels
comprising the proposed redevelopment, 200, 206, 210 S. West Street in Raleigh, North Carolina
(the "site"). The site is managed under the North Carolina Department of Environmental Quality
(NCDEQ), Division of Waste Management (DWM) Brownfields Program (Project ID:
23010-19-092).
1.1 Site Location
The site consists of the following three parcels, totaling approximately 1.76-acres:
PIN No. 1703488450 (200 S. West Street);
PIN No. 1703488314 (206 S. West Street); and,
PIN No. 1703488250 (210 S. West Street).
The coordinates at the approximate center of the site are 35°46'40.8"N, 78°38'47.6"W. Exhibit 1
illustrates the site location on a topographic map. The site elevation varies between approximately
312 to 317 feet above mean sea level, with the lowest topography along the southern site boundary
and highest along the northern site boundary. The site is proposed for re -development into the
Raleigh Union Station Bus (RUSBus)Station with a mixed use residential and commercial building
above the station (Exhibit 2).
1.2 Site Description and History
The site is located along the western margin of Raleigh's central business district referred to as
the Warehouse District. Based on information obtained from historical site investigations and the
Wake County GIS website, the site is comprised of three parcels totaling approximately 1.76-acres.
The parcels are improved with multiple structures, which occupy the majority of the land on the
site. Site occupants include vacant warehouse space, offices, and 5-Star restaurant. Since the late
1890s, the area has been used for railroad, warehouse storage, and various other industrial or
commercial operations
1.3 Historical On -Site Operations
The structure located at 200 S. West Street, is a two-story commercial/retail structure with a
basement. The current structure was constructed in 1920 and remodeled in 1975 and 2013. Prior
to 1920, occupants of the site included Raleigh Ice & Refrigeration Company (1896, 1903) and the
Johnson & Johnson Ice Factory (1909, 1914). The Imperial Casket Co occupied the structure from
at least 1920 to 1981 with additional occupants of the building including: US Supply Co (1986 to
1991), Philip Crawford & Associated Design (1997 to 2002), and Five Star Restaurant (2003 to
Present).
Responsive Resourceful Reliable 1

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 Terracon Project No. 70187342
The structures located at 206 and 210 S. West Street are two 2-story vacant warehouse structures
and contain a basement or partial basements in portions of the building. The current structures
were constructed in 1922 (206 S. West Street) and 1910 (210 S. West Street). Prior occupants of
the site include: Hacks Ellington & Co Sash -Door -Blind Co (1896), Midgley Spoke Factory (1903),
National Biscuit Company (1909, 1914) and Monument Works (1914). Dillon Supply Co occupied
the structures and converted them into their current formation by at least 1936. By the early 1990s,
Dillon Supply sold fork lift truck parts within the on -site warehouse area. The majority of the on -site
structures have remained vacant since 2004. The adjacent rail spur to the west of the property has
been present since at least 1896.
Key historical features and locations are presented on Exhibit 3.
1.4 Historical Site Investigations
This section provides a chronological description of historical environmental investigations
conducted at the site. Approximate sample locations from previous investigations, if known, are
depicted on Exhibit 3 for an overview of on -site and off -site sample locations, respectively.
Analytical data from prior reports are summarized in Table 1 and Table 2.
1.4.1 Phase I Environmental Site Assessment (2003)
The 2003 ESA completed by URS indicated that potential groundwater contamination may have
been present at the site due to up -gradient unknown sources. The unknown source(s) could
include up -gradient prior petroleum releases with detections above groundwater standards, prior
automotive repair operations and/or. prior dry-cleaning operations.
The presence of active and historical rail sidings adjacent to the parcel raises the possibility of
residual contamination. Common rail line contamination can include oil and grease from engines,
diesel, and coal residues from spilled fuels, polychlorinated biphenyls (PCBs) from railroad
transformers, creosote from rail timber preservatives, and/or a variety of chemicals carried as
freight that may have spilled or leaked during transit of loading/unloading. The former structure
contained a loading dock facing the active rail line (URS, 2003).
1.4.2 Limited Site Investigation (2004)
A Phase II Environmental Site Assessment (URS, 2004) included collection of one groundwater
sample (MW-C-03) from the northern portion of the site, which contained benzene,
1,2-dichloroethane (DCA), tetra chloroethene (PCE), and trichloroethene (TCE) detections above
their respective 2L standards. One soil sample was collected from the boring in the same location
as the groundwater sample (MW-C-03), which did not contain detections of constituents of concern
above the Soil Remediation Goals and staining and/or odors were not observed during sample
collection activities.
Responsive Resourceful Reliable 2

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 ■ Terracon Project No. 70187342
Soil samples were collected from two borings in the western portion of the site. Arsenic was
detected in soil sample SB-C-05 (10 ft below ground surface [bgs]) above its industrial/commercial
Preliminary Soil Remediation Goal (PSRG) and above its residential PSRG in the second soil
sample, SB-C-04.
1.5 Site Regulatory Status
The site has the following regulatory listings:
IHSB Site ID: NONCD0001124; Name: Raleigh TTA-Wilson Parcel
IHSB Site ID: NONCD0001126; Name: Raleigh TTA-Parcel B
The site was granted eligibility into the NCDEQ Brownfields Program on March 28, 2019 (Site No.
23010-19-092).
1.6 Summary and Data Gap Evaluation
The existing data set provides the preliminary basis for our understanding of contaminant
distribution and concentrations at the site. Data was compared to the most recent NCDEQ North
Carolina Administrative Code 2L Groundwater Quality Standards (April 2013) and Indoor Air and
Vapor Intrusion Screening Levels (February 2018). Data is summarized in Table 1 and Table 2.
Based upon our evaluation of the previous site assessment activities, Terracon has developed the
following summary of existing data, organized by area of concern (AOC) (Exhibit 3):
Adjacent Rail Spur (AOC-1): A rail spur has been present along the western
portion of the site since at least 1896. Common rail line contamination can include
oil and grease from engines, diesel, and coal residues from spilled fuels, PCBs from
railroad transformers, creosote from rail timber preservatives, and/or a variety of
chemicals carried as freight that may have spilled or leaked during transit of
loading/unloading. There is the potential for impacts in this vicinity.
Off -site and Up -gradient Groundwater Impacts (AOC-2): Multiple former dry
cleaning and gasoline station operations were located to the north and northwest
of the site. Available analytical data indicates groundwater contamination from
these off -site operations extends on -site.
Based on the previous site assessment activities, as summarized above, Terracon has identified
the following data gaps:
AOC-1: Potential impacts have not been evaluated for the adjacent rail spur.
Potential soil contamination for the proposed redevelopment has not been
evaluated; and,
Responsive Resourceful Reliable 3

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 Terracon Project No. 70187342
AOC-2: Potential groundwater and soil vapor intrusion pathways for the proposed
redevelopment on -site have not been sufficiently evaluated;
Terracon proposes to collect shallow soil samples across the site to evaluate non-residential
worker and construction worker exposure pathways. Additionally, Terracon proposes to collect
deep soil gas and/or sub -slab soil vapor samples to evaluate for potential vapor intrusion. At the
time of this work plan, Terracon has not reviewed a final redevelopment plan or a final cut/fill plan
for the site. Terracon can address potential import/export soil samples in the Environmental
Management Plan (EMP) for the site.
Terracon understands that the PD intends to restrict groundwater usage. As part of the Brownfields
Agreement, this will be recorded as a land use restriction and is not considered a complete
exposure pathway. Although detailed construction plans have not yet been developed, it is
possible that dewatering may be needed during construction activities. Due to the potential to
construction worker exposure to groundwater and to identify appropriate handling and disposal
options, Terracon proposes collecting groundwater samples.
Surface water and sediment are not located on the site, and therefore do not need further
investigation.
2.0 WORK PLAN FOR ADDITIONAL ASSESSMENT
Based on the results of the previous assessment activities and the data gap evaluation, Terracon
proposes to collect soil, groundwater, and sub -slab soil vapor samples for laboratory analyses.
The proposed Sample and Analysis Plan (SAP) is provided in Table 3. Locations of the proposed
samples are provided on Exhibit 4.
2.1 Health and Safety Plan
Terracon has a 100% commitment to the safety of all its employees. As such, and in accordance
with our Incident and Injury Free® (IIF®) safety culture, Terracon will update a health and safety
plan for use by our personnel during field services. Prior to commencement of on -site activities,
Terracon will hold a meeting to review health and safety needs for this specific project. At this
time, we anticipate performing fieldwork in OSHA Level D work attire consisting of hard hats, safety
glasses, protective gloves, and steel -toed boots. It may become necessary to upgrade this level
of protection, at additional cost, in the event that petroleum or chemical constituents are
encountered in soils or groundwater that present an increased risk for personal exposure.
2.2 Utility Location and GPR/EM Assessment
At least four business days prior to intrusive activities, Terracon will submit a locate request to the
public utility locator [NC 811] to arrange for location of underground public utilities from the street
up to the utility meter. As an added measure of safety, Terracon will subcontract a private utility
Responsive Resourceful Reliable 4

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 Terracon Project No. 70187342
locator in an attempt to locate and mark public utilities beyond the meter as well as any additional
site utilities identified near the proposed locations. Terracon proposes to utilize ground -penetrating
radar (GPR) and electromagnetic (EM) methods to attempt to locate within the interior of the
building to the extent practical.
2.3 Soil Sampling
Four (4) soil borings (SIB-01 through SB-04) will be advanced at the approximate locations
identified on Exhibit 4 to evaluate the subsurface conditions. The sample locations have been
selected based on current site accessibility in and around the existing structures. A plan for further
redevelopment of the site remains in the design phase. Soil borings will be advanced to
groundwater or a depth of 8 feet ft bls, whichever is encountered first.
Two (2) soil samples will be collected from each boring. One sample will be collected from a
surficial depth interval (0 to 3 feet bls) and the other will be screened and collected from the
subsurface (3 to 8 feet bls). The soil samples will be submitted for the following laboratory
analyses, as summarized in Table 3:
■ Volatile organic compounds (VOCs) via EPA Method 8260;
■ Semi -volatile organic compounds (SVOCs) via EPA Method 8270;
Resource Conservation and Recovery Act (RCRA) 8 Metals via EPA Method 6010/7471;
Hexavalent chromium via EPA Method 7199 (if needed; samples placed on hold pending
RCRA 8 Metals analytical results); and,
■ Polychlorinated biphenyl (PCBs) via EPA Method 8082.
The proposed sample locations are shown on Exhibit 4.
2.3.1 Soil Sampling Methodology
The above -described scope of work will be conducted in general accordance with the NCDEQ
Inactive Hazardous Sites Program (IHSB) Guidelines for Assessment and Cleanup (2015) and
EPA Soil Sampling procedures (EPA, 2014).
Soil borings will be advanced via direct push technology (DPT) drilling techniques where possible.
Non -dedicated sampling equipment will be decontaminated prior to each use. Soil samples will be
collected continuously, logged for lithology, and will be field screened with a photoionization
detector (PID).
Samples for SVOC and RCRA metals analyses will be composited from each interval. Grab
samples for VOC analysis will be collected from the depth considered to have a high potential for
contamination, as determined by field screening with a PID. Upon collection, soil samples will be
packed in an ice filled cooler and shipped to a North Carolina certified laboratory under chain -of -
custody protocols for analysis.
Responsive Resourceful Reliable 5

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 ■ Terracon Project No. 70187342
It is anticipated that the reporting and/or detection limits for most compounds analyzed by the
above -listed methods will meet the IHSB Residential PSRGs; however, due to the technological
constraints of laboratory instrumentations and equipment, the reporting and/or detection limits for
certain compounds such as polyaromatic hydrocarbons (PAHs) may exceed the PSRGs. Terracon
will contact the laboratory prior to sample collection to discuss its method detection limits.
The laboratory will be asked to hold portions of the samples collected for hexavalent chromium
analysis. The decision to analyze the held portions of the samples for these compounds will be
made after a review of the initial total chromium results. The analytical laboratory will be contacted
to discuss the relevant hold times and an appropriate analytical turnaround time will be selected
for the initial round of sample analysis to allow for the additional analyses, if necessary. Temporary
investigation locations will be plugged and abandoned in accordance with applicable state
requirements.
2.4 Groundwater Sampling
Upon completion of soil sampling activities, three (3) of the borings will be converted into temporary
groundwater monitoring wells (TW-01 thorough TW-03) to facilitate the collection of groundwater
samples. Based on prior investigations, Terracon anticipates encountering groundwater between
8 and 20 ft bls. Temporary wells will be installed approximately five feet below the observed water
table or at a maximum depth of 25 ft bls. The temporary wells will be constructed with the following
materials:
10 feet of 1-inch diameter, 0.010-inch slotted PVC screen with a threaded cap;
1-inch diameter, threaded, flush -joint PVC riser pipe to surface;
Pre -sieved 20/40 grade silica sand to approximately 1 to 2 feet above the well screen; and
Hydrated bentonite chips (approximately 1 to 2 feet) on top of the sand pack.
Temporary monitoring wells will be purged using a peristaltic pump. During purging, pH will be
measured using a portable field instrument. One groundwater sample will be collected from each
temporary monitoring well utilizing new, disposable low -flow sampling equipment. The samples
will be submitted for the following laboratory analyses, as summarized in Table 3:
Volatile organic compounds (VOCs) via EPA Method 8260;
Semi -volatile organic compounds (SVOCs) via EPA Method 8270;
Resource Conservation and Recovery Act (RCRA) 8 Metals via EPA Method 6010/7471;
Hexavalent chromium via EPA Method 7199 or similar method (if needed; samples placed
on hold pending RCRA 8 Metals analytical results);
Polychlorinated biphenyl (PCBs) via EPA Method 8082;
1,4-Dioxane vis EPA Method 8260SIM; and,
■ Iron and manganese via EPA Method 6010.
Responsive Resourceful Reliable

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 ■ Terracon Project No. 70187342
Non -dedicated sampling equipment will be decontaminated after each sample is collected using a
non -phosphate soap wash followed by a potable water rinse. Upon completion of groundwater
sampling activities, a licensed driller will abandon temporary wells. Soil cuttings will be
containerized as described in Section 4.0. The surface will be patched with materials similar to
the existing material, to the extent practical.
2.5 Soil Vapor Sampling
Depending on site accessibility, a combination of deep soil vapor points and sub -slab soil vapor
points will be used to evaluate the potential vapor intrusion risk at the site. Up to six soil vapor
points will be installed at the site (Exhibit 4). The installation procedures will be in general
accordance with the practices outlined in the Interstate Technology and Regulatory Council (ITRC)
Vapor Intrusion Pathway: A Practical Guidance (2007) and the NC Division of Waste Management
Vapor Intrusion Guidance (2018).
Soil vapor monitoring points will be constructed in a borehole advanced using either DPT or a
hammer drill through the floor slab. The placement of the soil vapor points inside the building will
be determined in the field. The locations will be adjusted based on utility clearance, accessibility,
and safety.
Each deep soil vapor point will be constructed in a borehole advanced using DPT drilling methods.
Boreholes will be advanced up to twelve (12) feet below the current land surface grade. Each point
will be constructed with a six-inch stainless -steel screen that has a barbed fitting at the top to
connect to small bore (0.25 inches O.D.) Teflon® -lined sample tubing. A sand filter pack will be
placed within the annulus to a height of six inches above the screen point. A one -foot thick layer
of dry, granular (No. 20) bentonite will be placed in the borehole annulus above the sand pack
followed by a layer of bentonite hydrated with deionized water to the land surface
Each sub -slab monitoring point will consist of an assembled Vapor Pin TM installed within a 5/8-inch
diameter hole. The hole will be lined with a pre-cut silicone sleeve that the Vapor Pin TM is
hammered into to create a competent seal with the concrete floor slab. Terracon will use 0.25-
inch outside diameter Teflon® lined tubing to connect the Vapor PinTm assembly to the laboratory
supplied Summa® canisters.
The soil vapor points will be allowed to equilibrate for a minimum of two hours after installation. A
helium tracer gas leak test will be conducted prior to sampling. The tracer gas serves as a quality
assurance/quality control (QA/QC) method to verify the integrity of the soil vapor probe seal.
Approximately three volumes of the vapor point annulus and attached Teflon® lined tubing will be
purged. Purge samples will be screened for helium to assess for leaks in the well seal and with a
PID detector to assess for VOCs. Sample collection will begin if the tracer testing indicates helium
concentrations in the vapor point are less than or equal to 10 percent of the helium concentration
in the shroud, indicating a sufficiently sealed vapor point annulus. Soil vapor samples will be
collected using an inline purge/sampling train consisting of a batch -certified 1-liter Summa canister
Responsive Resourceful Reliable 7

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 Terracon Project No. 70187342
for sample collection (sample canister) connected to a critical orifice flow restrictor (flow controller).
The sampling train and quality assurance/quality control (QA/QC) procedures described below are
depicted on the attached soil vapor sampling guide.
Samples will be collected with 1.0-liter Summa® canisters equipped with flow controllers and
analyzed for VOCs per EPA Method TO-15. After completion of soil vapor sampling activities, the
vapor sample points will be abandoned by removal of the tubing, Vapor PinTm and silicone sleeve
and patching with neat cement grout or hydrated bentonite to the slab surface. Investigation and
sample collection procedures will be conducted in accordance with local industry standard
practices.
Shut -In Test
At each soil vapor sample point, prior to connection of the sampling train to the sample point, a
shut-in (dead -head) test will be conducted to check for leaks in the above -ground purge/sampling
manifold. The sample canister and a sacrificial canister (which will not be submitted for laboratory
analysis) will be connected to the sampling train. The sampling train influent will be capped, the
sampling canister will remain closed, and the sacrificial canister will be opened to create a negative
pressure reading on the sampling train pressure gauge. The sacrificial canister valve will then be
closed. If there is an observable loss of vacuum, the fittings will be adjusted until the vacuum in
the sample train does not noticeably dissipate.
Helium Tracer Test
For each soil vapor sample point, following the shut-in test, the purge/sampling train will be
connected to the soil vapor sampling point and a Helium tracer gas leak test will be conducted.
The tracer gas serves as a QA/QC method to verify the integrity of the seal of sampling train to the
sample point. An MGD-2002 (or equivalent) helium detector will be used to verify the presence
and concentration of tracer gas.
The protocol for using a tracer gas is to enclose the tubing and ground interface within a shroud
and enrich the shroud atmosphere to at least 10 percent helium. The purging device (i.e. syringe
or peristaltic pump) will be situated inside the shroud and connected to the sampling train by
Teflon® lined tubing running through the shroud. A minimum of three volumes of the vapor point
annulus and attached Teflon® lined tubing will be purged. Purged soil gas will be directed to a
tedlar bag at the end of each purge volume. Purged soil gas in the tedlar bag will then be screened
for helium to assess for leaks in the sampling point seal and with a photo -ionization detector (ppb
RAE 3000 or equivalent) to assess for VOCs. The shroud helium concentration and the helium
concentration in the purged soil vapor will be documented after each volume purged.
Sample collection will begin if the tracer testing indicates helium concentrations in the vapor point
are less than or equal to 10 percent of the helium concentration in the shroud, indicating a
sufficiently sealed vapor point annulus. A photograph of the shroud and sampling set-up at each
sample location will be included in the report.
Responsive Resourceful Reliable

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 Terracon Project No. 70187342
Sample Collection
After completion of the helium tracer test, the valve of the purge device will be closed, and the
sample canister valve will be opened to collect soil vapor for laboratory analysis. The sample will
be collected in a laboratory supplied, batch certified 1.0-liter Summa canister connected to sample
tubing using Swagelok® fittings at the soil vapor point. The sample canister will be filled using a
dedicated flow controller and set to a sample rate of less than or equal to 200 milliliters per minute.
An in -line vacuum gauge will be installed to the sample controller to verify initial vacuum levels
within the canister and as an indicator that final equalization has been reached (i.e. sampling is
complete). The sample canister valve will be closed when the gauge measures less than 6 inches
in Hg vacuum (i.e. sampling is complete). The final vacuum will not be allowed to reach 0 inches
Hg vacuum.
A proposed Sample and Analysis Plan is presented in Table 3 and proposed sample locations are
shown on Exhibit 4.
3.4 QUALITY CONTROL/QUALITY ASSURANCE
Terracon will collect one (1) duplicate from each media for each of the analytical parameters listed
in Section 2.0. The duplicate soil sample SVOCs and RCRA 8 metals analysis will be prepared via
the quartering method per the EPA Soil Sampling procedures (EPA, 2014). The duplicate soil
sample for VOC analysis will be a grab sample. A duplicate for the soil vapor will be collected and
sampled for TO-15. Terracon will also request that the laboratory prepare one (1) trip blank for
VOC analysis for each cooler containing VOC samples. Upon collection, soil samples will be
packed in ice -filled coolers and shipped to a North Carolina certified laboratory under chain -of -
custody protocols for analysis.
Quality control/quality assurance samples include one equipment blank per day of field sampling.
4.0 INVESTIGATION DERIVED WASTE MANAGEMENT
Terracon anticipates investigation derived waste generated during this assessment will consist of
soil cuttings and decontamination water. IDW will be containerized per NCDEQ regulations.
IDW container(s) will be labeled and left on -site and may require off -site disposal pending
laboratory results. If analytical results indicate that off -site disposal of the containers is not required,
the IDW materials may be spread on -site.
Responsive Resourceful Reliable 9

Brownfields Data Gap Assessment Work Plan
Raleigh Union Station Bus Station Raleigh, North Carolina Irerracon
June 12, 2020 ■ Terracon Project No. 70187342
5.0 REPORTING
The results of the data gap assessment will be provided in a written report. The report will include
a summary of the sample collection activities and resulting analytical data. Analytical data will be
presented in tables and on figures, where pertinent, and the laboratory report will be included in
an appendix to the report. Sample locations will be presented on figures. Data will be entered into
the most current version of the NCDEQ Risk Calculator. Terracon will provide a summary of its
findings and recommendations. The report will be signed and sealed by a North Carolina licensed
Professional Engineer or Professional Geologist. The findings, comments and recommendations
presented in the written report will be based on the information collected as discussed in this work
plan and generated during the field activities.
6.0 REFERENCES
EPA, 2004. Operating Procedure: Soil Sampling. U.S. Environmental Protection Agency, Region
4. August 2014.
ITRC, 2007. Interstate Technology Regulatory Council Vapor Intrusion Pathway: A Practical
Guidance. January 2007.
NCDEQ DWM, 2018. NCDEQ Division of Waste Management Vapor Intrusion Guidance. March
2018.
USEPA, 2009. US Environmental Protection Agency Hazardous Waste Characteristics, A User -
Friendly Reference Document. October 2009.
URS, 2003. Phase I Environmental Site Assessment: Triangle Regional Rail Project Downtown
Raleigh Station, Raleigh, Wake County, North Carolina, dated November 10, 2003.
URS, 2004. Phase II Environmental Site Assessment: Triangle Regional Rail Project Downtown
Raleigh Station, Raleigh, Wake County, North Carolina, dated May 13, 2004.
Responsive Resourceful Reliable 10

EXHIBITS

— 3
NT
5
{_«
SITE
l �� , i � N T f��1• r �-F-
JL—il
-
-
-- � � � � `�.'� L2) �'' ■ I' - �I r � r i � � �l � � i � q I � � � ran, =����
' - —� ..7 • ti w- ��} � i 1_ is i r' + .-. I, r--y � , ��� �E lr+�si
`',I—I��
�r C•— i1:1 f I
, I I -'
J
35 j.
j'I'a r � ��_- ,-f , r �k . � ��� yyy- _ _.k — �' �� �• `° 1. � � _ , ��r`=i
— dtiJ! f /t )� r��~ ��!1 j` tiav ��� ! #'�!qp ,� II x
- r' � �- � __- f { — r � �� ■ %III n _ "�I � �- �_�.-��\.i4 tf1
/
All
TOPOGRAPHIC MAP IMAGE COURTESY OF THE U.S. GEOLOGICAL SURVEY
QUADRANGLES INCLUDE: RALEIGH WEST, NC (1/1/2002) and RALEIGH EAST, NC (1/1/2002).
Project Manager: Project No. TOPOGRAPHIC MAP Exhibit
ALF 701=2,00 Irerracon
Drawn by: Scale:
ALF 1"=2000'
Checked by: MTJ FileN,76187342 Data Gap Assessment: GoTriangle - RUSBus
�U 2401 Brentwood Rd, Ste 107 200, 206 & 210 S. West Street
Approved by: MTJ Date: FEB 2020 Raleigh, NC 27604-3666 Raleigh, Wake County, North Carolina

ACitrix
120 S. West Street
(Brownfields Project No. 16023-12-92)
w
IJJ
w
r
206 S. West Street
v7
Y
U
�5 Q
G `
0P� ion—
� 1 210 S. West Street
� J
�P� Q
tY
t
t
4
I
Raleigh Union Station
510 W. Martin Street
(Brownfields Project No.17031-13-92)
Legend
Wake County Parcel Boundaries
Brownfields Site Boundary
PM:
ALF
Project No.
70187342
Irerracon
Drawn By: ALF
Scale:
1 in = 100 ft
Checked By:
MTJ
File Path:
70187342
Approved By-
MTJ
Date:
2�24�2020
2401 Brentwood Drive, suite 107 Raleigh, NC 27604
phone: [phone] Fax: [phone]
The Dillion
223 S. West Street
E
" g Y
WEST MARTIN STREET
0 50 100
Feet
Proposed Development Area EXHIBIT
NO.
Data Gap Assessment
GoTriangle RUSBus 2
200, 206 & 210 South West Street
Raleigh, Wake County, North Carolina

.A
MW-C-01: Collected 02/2004
Lead: 9.0
WEST HARGETT STREET
Citrix
120 S. West Street
(Brownfields Project No. 16023-12-92)
MW-C-01
10U-B15a: Collected 02/2004
Lead: 6.7
I
r
M W-C-
MW-B 15a
Y
v
Q '
Q
SB-C-04: Collected 02/2004 O '
At 9 feet bgs J 1
Acetone: ND oaG 1 SB-C-04
Arsenic:0.71 mg/kg
Barium: ND mg/kg
Chromium (III): 9.7 mg/kg
Lead: ND mg/kg
Nickel: ND mg/kg
I
10U-B15 SB-C-O�
10U-1315: Collected 02/2004�/-
Barium: 406
Chromium: 37.6
Lead: 14.1 MW-H-01
Raleigh Union Station
510 W. Martin Street - -
(Brownfields Project No-17031-13-92)
Legend
Groundwater Sample Location
O Soil Sample Location
Wake County Parcel Boundaries
Brownfields Site Boundary
MW-C-02
200 S. West'Street
I
3
206 S. West Street'
210 S. West Street
MW-H-04
PM:
ALF
Project No.
70187342
Irerracon
Drawn By: ALF
Scale: , n = 100 ft
1 I
Checked By:
MTJ
File Path:
70187342
Approved By-
MTJ
Date:
2/24/2020
2401 Bren wood Drive, site 107 Raleigh, NC 27604
phone: (919) 873r2211 Fax: [phone]
H
W
W
MW-H-01: Collected 02/2004
Benzene: 0.63J
cis-1,2-Dichloroethene: 0.74J
1,2-Dichloroethane: 4.9
Diisopropyl ether: 0.58J
Tetrachloroethene: 0.67J
Trichloroethene: 0.64J
Barium: 278
Chromium: 15.1
Lead:11.6
MW-C-02: Collected 02/2004
Benzene:10.2
Cholorform: 3.5J
1,2-Dichloroethane: 7.2
Isopropyl benzene: 11
Diisopropyl ether: 2.5
MW-C-03: Collected 02/2004
Benzene: 6.5
cis-1,2-Dichloroethene: 4.9
1,2-Dichloroethane: 3.7
Diisopropyl ether: 2.6
Tetrachloroethene: 1.9J
Trichloroethene: 3.5
SB-C-05: Collected 02/2004
At 6 to 7 feet below ground surface
(bgs) and duplicate
Acetone: 38.7J and ND
Arsenic: 0.91 and 1.1 mg/kg
Barium: 127 and 165 mg/kg
Chromium (III): 13.6 and 9.0 mg/kg
Lead: 15.6 and 14.1 mg/kg
Nickel: 7.7 and 10.7 mg/kg
At 10 feet bgs
Acetone: ND
Arsenic:4.2 mg/kg
Barium: 152 mg/kg
Chromium (III): 3.4 mg/kg
Lead: 14.6 mg/kg
Nickel: 16.1 mg/kg
MW-H-04: Collected 02/2004
ND
WEST MARTIN STREET
0 50 100
Feet
Historical On -Site Sample Location Map EXHIBIT
NO.
Data Gap Assessment
GoTriangle RUSBus 3
200, 206 & 210 South West Street
Raleigh, Wake County, North Carolina

ACitrix
120 S. West Street
(Brownfields Project No. 16023-12-92) I j
w
H
to
n
w
0,0, MWbL of
t
/ Po
P�'
0
r
'
(
200:S. West Street
O
�a
206 S. W� est}Street
o '
210 S. West Street
(
A
i
0
-
Raleigh Union Station
510 W. Martin Street
(Brownfields Project No. 17031-13-92)
The Dillion
223 S. West Street
WEST MARTIN STREET
Legend
O Proposed Soil Boring Location
A Proposed Soil Vapor Point
Proposed Soil Boring and Temporary Monitoring Well Location
Brownfields Site Boundary
0 50
100
Feet
Wake County Parcel Boundaries
PM:
ALF
Project No.
70187342
Proposed Sample Location Map
EXHIBIT
NO.
Drawn By:
Scale:
ALF
1 in = 100 ft
Irerracon
Data Gap Assessment
GoTriangle RUSBus
4
Checked By:
File Path:
MT J
70187342
200, 206 & 210 South West Street
Raleigh, Wake County, North Carolina
Approved By
MTJ
Date:
z4o,BrenwooGorlve,sw1e107 Raleigh, NC275o4
phone: [phone] Fax: [phone]
2/21 /2020

TABLES

Table 1
Historical Soil Analytical Results
Data Gap Assessment
GoTriangle - RUSBus
Raleigh, Wake County, North Carolina
Terracon Project No. 70187342
Soil Analytical Results
Contaminant of Concern
v
Q
E
2
o
a)
°
v
Well/Sample
I.D.
Date
Collected
(mm/dd/yy)
SB-C-04 (at 9 ft bgs)
02/09/2004
0.71
ND
9.7
ND
ND
ND
SB-C-05 (at 6-7 ft bgs)
02/09/2004
0.91
127
13.6
15.6
7.7
38.7.1
SB-C-05 duplicate (at 6-7 ft bgs)
02/11/2004
1.1
165
9
14.1
10.7
ND
SB-C-05 (at 10 ft bgs)
02/10/2004
4.2
152
3.4
14.6
16.1
ND
Residential PSRG
0.68
3,100
23,000
400
NE
12,000
Industrial/Commercial PSRG
3
47,000
350,000
400
NE
140,000
Protection of GW PSRG
5.8
580
360,000
400
NE
25
Note:
Concentrations are reported in milligrams per kilograms (mg/kg)
PSRG: Preliminary Soil Remediation Goals
GW: Groundwater
ft bgs: Feet below ground surface

Table 2
Historical Groundwater Analytical Results
Data Gap Assessment
GoTriangle - RUSBus
Raleigh, Wake County, North Carolina
Terracon Project No. 70187342
Groundwater Analytical Results
Analytical Method
v
v
�
v
Contaminant of Concern 4
0
O
y
Well/Sample
Date Collected
U
_
Q
Q
2
0
t
v
0
I.D.
(mm/yy)
N
N
U
0
Q
0
U
O
CO
MW-C-03
02/04
6.5
4.9
3.7
2.6
1.91
3.5
2L Standard
1
70
0.4
70
0.7
3
Exceeds 21. and GWSL
16
NE
22
1,400
12
1.0
GCL
5,000
70,000
400
70,000
700
3,000
Note:
Concentrations are reported in micrograms per liter (µg/L)
1,2-DCA: 1,2-Dichloroethane
J: estimated concentration above the laboratory method detection limit and below the reporting limit.
NCAC 2L Standard - North Carolina Administrative Code Subchapter 2L Groundwater Quality Standards (April 1, 2013)
GWSL for Vapor Intrustion (Res) - NCDEQ Groundwater Screening Level for Residential Vapor Intrusion (February 2018)
NE: Not established

Table 3
Brownfields Data Gap Assessment Work Plan
Proposed Sample and Analysis Plan
Raleigh Union Station Bus Station
Terracon Project No. 70187342
Analysis (Method)
Area of Concern
Installation/Sample
Collection Method
Sample
Boring
Depth
(feet)
Sample ID
Matrix
o
N
0
>
N
oo
0
N
0
N E
X o
2 U
N
W
0
1
CmJ
a
6
o �
o�
N
0
o
a Ono
- ry .�
,;,
-
0 o
H
SB-01
0-3
SB-01 (0-3)
X
X
X
HOLD
X
3-8
SB-01 (3-8)
X
X
X
HOLD
X
Surficial Soil and Area Along
Western Site Boundary
DPT / Grab Samples for
VOCs
SB-02
0-3
SB-02 (0-3)
Soil
X
X
X
HOLD
X
3-8
SB-02 (3-8)
X
X
X
HOLD
X
SB-03
0-3
SB-03 (0-3)
X
X
X
HOLD
X
3-8
SB-03 (3-8)
X
X
X
HOLD
X
SB-04
0-3
SB-04 (0-3)
X
X
X
HOLD
X
3-8
SB-04 (3-8)
X
X
X
HOLD
X
Potential Groundwater
Contamination
DPT / Peristaltic Pump
TW-01
<_25
TW-01
Water
X
X
X
HOLD
X
X
X
TW-02
1525
TW-02
X
X
X
HOLD
X
X
X
TW-03
<_25
TW-03
X
X
X
HOLD
X
X
X
Sub -Slab: Hammer Drill &
SV-01
0.25 or 12
SV-01
X
SV-02
0.25 or 12
SV-02
X
Potential for Vapor Intrusion
from Off -site Sources of
Groundwater Contamination
Vapor Pin
and/or
Deep Soil Vapor: DPT &
Soil Vapor Point 1
Soil Vapor
SV-03
0.25 or 12
SV-03
X
SV-04
0.25 or 12
SV-04
X
SV-05
0.25 or 12
SV-05
X
SV-06
0.25 or 12
SV-06
X
Notes
VOCs - volatile organic compounds
SVOCs - semi -volatile organic compounds
RCRA - Resource Conservation and Recovery Act
PCBs - polychlorinated biphenyl
SV - Soil Vapor
DPT - Direct Push Technology
HOLD - Hold samples for total chromium analysis
1 - Site conditions and accessibility will determine if a soil vapor point is sub -slab or deep soil vapor.