25022_SouthBank Bldg_AWP_20211012

DATA GAP ASSESSMENT WORK PLAN
SOUTHBANK BUILDING
400 WEST MAIN STREET
DURHAM, NORTH CAROLINA
BROWNFIELDS PROJECT NO.: 25022-21-032
MID -ATLANTIC PE LICENSE: F-0967
REVISION NO.: 1
MID -ATLANTIC JOB NO. OOOR3710.00
October 12, 2021
Prospective Developer:
Five Point Center -Durham, LLC
Austin Hills
400 West Main Street
Suite 100
Durham, North Carolina 27701
Phone: [phone]
Email: [e-mail]
Consultant:
Mid -Atlantic Associates, Inc.
Daniel Nielsen, PE
409 Rogers View Court
Raleigh, North Carolina, 27610
Phone: [phone]
Email: [e-mail]
Brownfields Project Manager:
TBD/Sharon Eckard
Mail Service Center 1646
Raleigh, North Carolina, 27699
Phone: [phone]
Email: [e-mail]
21
ft Mid Atlantic

Mid Atlantic
Engineering & Environmental Solutions
SECTION 1 INTRODUCTION
409 Rogers View Court
Raleigh. NC 27610
office 919,250.9918
Facsimile 919.250.99SO
MAAONLINE.COM
The subject site is one 1.8-acre parcel located at 400 West Main Street in Durham, North Carolina
(Figure 1). Although the assessment actives described in this Work Plan include soil and
groundwater assessment as well as soil gas assessment, this Work Plan has been developed and
formatted in accordance with the Vapor Intrusion Assessment Work Plan & Report Checklist, July
2021 developed by the North Carolina Department of Environmental Quality (DEQ) Brownfield
Program.
1.1 History with the Brownfield or other DEQ Programs
A Brownfield Property Application was submitted to DEQ on March 5, 2021. DEQ issued a Letter of
Eligibility on July 19, 2021. We are not aware of any other DEQ Programs' involvement with this
site.
1.2 Chronology of Former and Current Uses
The site is in an urban setting with development predating 1884. From 1884 until 1973 site has
been used for tobacco warehousing, dwellings, church, cooperage, stores, restaurants, steam
laundry, shoe repair, bicycle repair, automotive repair, filling station and dry cleaning. In 1973 the
site was developed with a bank/office facility which is currently in use.
1.3 Vapor Intrusion Potential
Prior environmental assessments involving analytical testing have not been conducted at the site.
A review of historical uses of the site and adjacent properties identified automobile repair, filling
station and dry cleaning. These activities often involve the use of volatile chemicals (petroleum and
chlorinated solvents) which can cause vapor intrusion issues. Specific use of trichloroethylene at
the site has not been identified, but it is often present at sites with dry cleaning solvent releases.
1.4 Recognized Environmental Condition (REC)
A Phase I Environmental Site Assessment was conducted in 2007 by Trigon Engineering
Consultants. This assessment concluded that there were no RECs at the property. Mid -Atlantic
conducted a review of historical uses of the subject site and identified the uses listed above.
These uses included automobile repair, filling station and dry-cleaning operations. These
historical uses are typically identified as RECs. The locations of the historical uses that are
environmental concerns are shown on Figure 3a.
EXPERIENCED CUSTOMER FOCUSED INNOVATIVE

Data Gap Assessment Work Plan
SouthBank Building
Durham, North Carolina
1.5 Conceptual Site Model
October 12, 2021
Page 2
This Data Gap Assessment Work Plan was developed based on historical use, soil cuts required
during redevelopment and the locations of the new structures included with the redevelopment.
Soil and groundwater assessment activities are selected to target historical uses. Soil sampling in
cut areas is included to address worker exposure concerns and soil reuse options. Soil gas
assessment activities include assessment under the current structure as well as within the footprint
of the future building. These data are intended to determine if historical use has caused vapor
intrusion conditions and if mitigation is warranted.
1.6 Assessment Scope Discussions with Brownfield Program
During a phone conference on August 11, 2021 with the Brownfield Program, the Prospective
Developer and the Environmental Consultant, the general scope of the data gap assessment was
discussed. It was recognized that there was no meaningful previous analytical data collected at the
site. Thus, the collection of baseline groundwater quality data was recommended by the Program,
along with soil data in the areas of concerning historical use. The Program recommended soil gas
sampling beneath the existing structure prior to demolition as well as in the footprint of proposed
new structures. Soil sampling in cut areas was also defined as a data gap.
1.7 Proposed Use
The redevelopment is mixed use retail and multifamily residential (apartments and condominiums).
A 450-space parking structure will also be constructed. The redevelopment will be completed in
two phases. The initial redevelopment design was used to develop portions of the scope detailed in
this assessment. Design for the second phase of redevelopment is conceptual at this time.
1.8 Demolition, New Construction and Foundations
The existing structure will be razed and replaced with the new structures in two phases. The new
structures are podium type construction with subgrade, slab -on -grade parking. No residential
space is located slab on grade. Portions of ground floor retail that extend beyond the footprint of
the subgrade parking are slab on grade.
1.9 Reuse of Existing Structures
There will be no reuse of existing structures.
1.10 Presence of Elevators and Stairwells
There are three stairwells and four elevators in a single elevator bank included in the
redevelopment plans. Each of these originate on the ground floor of the parking structure and enter
the occupied portions of the buildings. A fifth elevator which run from floors 1 to 6 (not in ground
contact) is also used in the design.
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1.11 New Structure Locations and Known Contamination
Analytical data has not previously been collected at the site. Thus, evaluating the relationship
between known contamination and proposed building was not conducted. The historical uses that
raise environmental concerns are located along the streets adjacent to the site. The redevelopment
building is set back from these streets and as such the building footprint does not directly overlie
the locations of these previous uses with the exception of historical USTs and automobile repair in
the northern portion of the site.
1.12 Proposed and Existing Building Size
The existing building ground floor is approximately 14,000 square feet (parking garage). The entire
existing building is 80,000 square feet. The proposed new building's ground floor totals 38,900
square feet in the basement garage and 6,700 square feet in ground contact around the perimeter
ground floor retail. The new building is 27 stories with a total of 650,000 square feet.
1.13 Brownfield Program Evaluation of Proposed Use
The Brownfield Application and subsequent issuance of the Letter of Eligibility were based on the
redevelopment of the site for mixed use retail and multi family. However, since analytical data has
yet to be collected at the site, the protective measures required for the proposed redevelopment
use have yet to be determined.
1.14 Attachments to the Work Plan
The following documents are included as attachments to this Work Plan
Figure 1 — Topographic Site Map (contents described in Section 8)
Figure 2 — Proposed Redevelopment Map (contents described in Section 8)
Figure 3a — Environmental AOC Sample Location Map (contents described in Section 8)
Figure 3b — Beneficial Fill Assessment Sample Location Map (contents described in Section 8)
Table 1 — Property Summary (contents described in Section 8)
Table 2a — Areas of Environmental Concern Sampling Summary (contents described in Section 8)
Table 2b — Beneficial Fill Sampling Summary (contents described in Section 8)
Appendix A - Tabular Summary of Historical Data
Appendix B — Completed Vapor Intrusion Assessment Work Plan & Report Checklist, July 2021
SECTION 2 SCOPE OF WORK
2.1 General Description
Since previous sampling has not been conducted at the subject site, this assessment will address
all media at the site. The assessment is also intended to evaluate soil cuts to assist with the
determination of how these soils can be reused or disposed. The assessment includes six soil
samples to address historical use, 15 soil samples for cut areas, six temporary groundwater
monitoring wells, three sub -slab soil gas samples and six exterior soil gas samples.
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2.2 Sample Justification
Soil
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Page 4
Note: This assessment includes evaluation of soil associated with potential environmental
concerns and `beneficial fill' assessment associated with cuts. For clarity, the details associated
with the potential environmental concerns are provided in Figure 3a and Table 2a. Whereas the
details associated with the areas of soil cut are illustrated in Figure 3b and Table 2b.
As summarized in Table 2a and illustrated in Figure 3a, soil samples SS-1 thru SS-6 will be
collected from the borings for temporary monitoring wells TMW-1 thru TMW-6 Soil samples. Each
of these sampling locations were selected based on the historical uses which are environmentally
significant and listed in Table 2a. These data will be used to determine if historical use has
adversely impacted soil.
Block soil samples Blk-A thru Blk-H(d) are collected in the soil cuts (Figure 3b) required during
redevelopment of the site. The data collected from analysis of these soils (Table 2b) will be used to
determine how cut soils can be managed.
Grnt j ndwatBr
Temporary groundwater monitoring wells TMW-1 thru TMW-6 are located in areas of historical use
that may cause an adverse impact on the subject site (Figure 3a). Data collected from these
temporary wells (Table 2a) will assist in determining the impacts of historical use both on site and
from nearby properties. It will also be used to assist in the evaluation of potential vapor
encroachment conditions.
Sub -Slab Soil Gas
Although the current building will be razed, the Brownfield Program suggested collecting sub -slab
soil gas samples from the sub terranean parking garage would be beneficial in evaluating potential
vapor encroachment conditions at the subject site. Samples SSSG-1 thru SSSG-3 are located
within the current parking garage floor (Figure 3a) and will be analyzed in accordance with Table
2a. These data will assist in evaluating vapor encroachment conditions exist at the site.
Exterior Soil Gas
The three exterior soil gas sample locations ESG-1 thru ESG-3 are selected within the footprint of
the new building to be constructed; excluding locations where the footprint of the new building is
coincident with the existing building (Figure 3a). Samples ESG-4 thru ESG-6 were selected based
on historical use. These samples will be analyzed in accordance with Table 2a and the data will
assist in evaluating vapor whether encroachment conditions exist at the site.
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SECTION 3 SAMPLING METHODOLOGY
3.1 Guidance Documents
Assessment activities will be performed in general accordance with the following documents.
Deviations from methods outlined in these documents are noted below or will be noted in the
final report.
• Brownfields Program Vapor Intrusion Assessment Work Plan & Report Checklist (July
2021);
• Inactive Hazardous Sites Program Guidelines for Assessment and Cleanup of
Contaminated Sites (July 2021);
• North Carolina Department of Environmental Quality, Division of Waste Management,
Vapor Intrusion Guidance (March 2018); and
• The Interstate Technology & Regulatory Council Vapor Intrusion Mitigation Training
Team Technical Resources for Vapor Mitigation Training (December 2020).
3.2 Soil Sampling
Soil samples will be collected using a GeoProbe macrocore sampler and direct push technology.
Soil samples will be collected from the sampling device (acetate sleeves from the macrocore
sampler) at up to five-foot intervals to final depth of the boring. Soil types in the macrocore sampler
will be characterized and used to develop soil boring logs. For borings associated with potential
contaminant sources, grab soil samples will be collected at depths shown in Table 2a unless field
observations and screening (e.g., readings from an organic vapor analyzer). indicate an alternative
sampling depth should be used.
Soils collected for the soil cut assessment will be collected from eight areas (Area A thru Area H).
illustrated in Figure 3b. Within each area there are three to five soil borings. Area A is a shallow cut
averaging approximately one foot. Equal sized aliquots will be removed from the acetate sleeve at
each boring within Area A. For Areas B thru H, the cuts are from 8 to 12 feet deep. In Areas B thru
H, two composite samples will be created. One sample will be collected at the shallow depth and
one collected at the greater depth. Each shallow and deep sample will be created from equal sized
aliquots removed from the acetate sleeve at the appropriate depth (Table 2b). All composite
samples will be created by mixing the aliquots in the field in a stainless -steel bowl with a stainless -
steel spoon prior to placing in the laboratory supplied sample jars. These tools will be
decontaminated between samples. For each Area (A thru H), one aliquot will be selected for
analysis of VOCs based on field observations and screening of the samples from each boring and
depth interval within a given Area. Soil sample analysis will be conducted as described in Section
4.
3.3 Groundwater Sampling
The boring for each temporary well will be advanced using an approximately 7-inch diameter
hollow stem auger -equipped Geoprobe rig. However, preliminary geotechnical data collected at the
site suggest weathered rock may be encountered at shallow depths. Weathered rock can preclude
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the use of auguring to advance borings. If this situation is encountered, air drilling will be used to
advance soil borings. All downhole equipment will be cleaned prior to use and between each well
boring. These wells will be constructed of new 2-inch diameter solid PVC riser with 15 feet of 0.01"
mechanically slotted well screen set to intercept the shallow water table (estimated to be 30 feet
below land surface). During previous geotechnical assessment at the site evidence of groundwater
was not identified to depths of 40 feet. It is not uncommon for groundwater to `appear' in
borings/wells several days after they are advanced/constructed. If no evidence of groundwater is
identified during well construction, the wells will be set at 40 feet and gauged for up to one week to
determine if shallow groundwater is present at the site. As the boring is advanced for well
construction, assuming air drilling is not required, macrocore soil samples will handled as described
in Section 3.2 above. A gravel pack of clean washed sand will be used to fill the borehole annular
space around the screened interval and terminate within two feet above the top of the screen. A
two -foot -thick layer of bentonite will be placed in the annular space above the sand pack. The well
will be developed by removing approximately five well volumes using a dedicated Teflon bailer. At
the conclusion of the sampling, bentonite will be poured down the well casing up to the top of the
well. The top section of well casing will be removed and the borehole filled to within 6 inches of
land surface with bentonite. The borehole will be topped with soil or replacement pavement
depending on the existing site surface.
Groundwater samples will be collected by low flow sampling techniques. Prior to groundwater
sample collection, each well will be purged of a minimum of three standing well volumes or to
dryness to remove stagnant water from the well and well bore in an effort to collect samples that
are representative of the water quality in the formation surrounding each well. Purging is performed
by using new, polyethylene tubing extended into the well and silicone tubing run through the pump
head (peristaltic pump). The silicone tubing is repeatedly pinched by rollers in the pump head
which creates a vacuum to draw water up into the tubing and into a container. Once a minimum of
three standing well volumes are purged, the monitoring wells will be purged at a steady rate of at
least 100 ml/min. Before and during purging, specific conductivity and pH measurements will be
collected on a prescribed interval at least 3 minutes apart. Stabilization occurs when, for at least
three consecutive measurements, the pH remains constant within 0.1 Standard Unit (SU) and
specific conductance varies no more than approximately 5 percent. Once stabilization is achieved,
the discharge from the pump will be directed into the appropriate laboratory supplied container(s).
Pump tubing is replaced prior to each well being sampled. New nitrile sampling gloves are donned
prior to purging and sampling of each well. Groundwater sample analysis will be conducted as
described in Section 4.
3.4 Soil Gas Sampling
Since indoor air sampling is not planned for this assessment, sequencing sample coordination
between sub -slab and indoor air sample collection is not applicable. The sub -slab soil gas samples
and exterior soil gas samples will be analyzed for the full list of analytes contained in the TO-15
compendium.
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Testing for mercury has not been previously conducted at the site. The soil analysis planned will
include mercury. Since industrial activities have not been identified in the historical use of the site,
analysis for mercury of soil gas does not appear warranted. If mercury is identified in the soil, the
need for analysis of soil gas for mercury will be evaluated.
Mid -Atlantic will request that the laboratory record the vacuum for each summa canister on the
chain of custody prior to shipping the samplers. During air and/or soil gas sampling activities,
vacuum readings recorded from the laboratory supplies vacuum gauges will be documented on the
chain of custody when sampling is initiated as well as when it is concluded. If the vacuum pressure
of a cannister prior to sampling is more than 10% lower than the vacuum documented at the
laboratory prior to shipment, the canister will not be used.
Sub -Slab Soil Gas Samples
At each sub -slab location, a rotary -impact drill equipped with a decontaminated spline drill bit will
be utilized to drill a 5/8-inch diameter hole through the concrete slab. The depth of the hole will be
the thickness of the concrete. At each location, the field technician will log the materials and
condition beneath the slab and clean the hole with a bottle brush and a paper towel dampened with
de -ionized water. A vapor sampling probe will be established using a new "Vapor Pin TM", a brass
barb fitting with a VOC-free silicone sleeve that creates a seal with the concrete when inserted
using an installation/extraction tool. The Vapor Pin will then be fitted with '/4-inch outer -diameter
rigid -wall Teflon tubing to complete the vapor sampling probe assembly. Each sampling location
will use new and dedicated tubing. A leak check will be performed at each probe location using a
plastic shroud, helium gas, and a portable helium gas detector. A plastic shroud will be placed over
the sub -slab vapor probe location and sampling train with the tubing of the probe exiting the shroud
through a small hole. A 3-way valve will be placed on the probe termination and connected to the
sampling apparatus. Helium will be released into the shroud via tubing from the cylinder, and a
grab sample collected by filling a Tedlar bag using the exhaust port of the purge syringe. Helium
concentrations of 200,000 to 300,000 parts per million are maintained within the shroud. The seal
around the VaporPin and sampling train fittings are considered acceptable if the helium
concentration in the tedlar bag is less than 10% of the concentration under the shroud. If this
condition is met, the soil gas samples will be considered representative of sub -slab vapor
conditions.
Sub -slab soil gas sample locations will be allowed to equalize a minimum of 20 minutes before the
sample is collected. Prior to collecting the sample, the sample location is purged of a minimum of
four volumes of the borehole in the concrete and the tubing. The volume of the borehole is
calculated based on the diameter of the hole and the thickness of the concrete. The volume of the
tubing is based on the inner diameter of the tube and the length of tubing used. The purging is
conducted using a 60 milliliter (mL) syringe. The volume of the syringe is divided into the volume of
the borehole and tubing. This value is multiplied by four and rounded up to determine the number
of syringe volumes required to purge the borehole prior to sampling. The purge will occur at a
maximum rate of three syringe discharges per minute (180 mUmin). After purging, the sub -slab
samples will then be collected using batch -certified 1-liter stainless steel canisters at a maximum
flow rate of 200 mL/minute which is established by the laboratory -provided flow regulator. The
initial (pre -sample) vacuum is recorded and each sub -slab sample is collected until the laboratory-
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provided vacuum gauge on the Summa cannister/flow regulator reaches 5 inches mercury (after
approximately five minutes). When the gauge reads 5 inches mercury, the vacuum is recorded and
the sampling valve on the Summa is closed.
Exterior Soil Gas Samples
At each exterior soil gas location, the pavement, if present, will be removed and cleared from the
boring location and a boring will be advanced to a depth of 15 feet, which is below the proposed
cut at each location, using a direct -push drill rig. Boring logs will be developed as described in
Section 3.2. New and dedicated 1/4-inch outer -diameter Teflon -lined tubing will be inserted into
each boring to within four inches of the bottom of the boring. A screen will be placed on the tip of
the tubing and a sand pack will be installed around the screen and tubing at approximately one foot
from the bottom of the boring. A six-inch thick hydrated bentonite seal will be installed above the
sand pack. The assembly, including the sample train, will be leak -tested and three volumes of the
air within the tubing and sand pack will be purged prior to sample collection as described above.
Exterior soil gas sample points will be allowed to equalize for approximately 48 hours prior to
sampling. A batch -certified laboratory -supplied Summa canister will then be attached to the tubing
to collect a soil -gas sample. Prior to collecting the sample, the sample location is purged of a
minimum of four volumes of the screened portion of the borehole and the tubing. The volume of the
borehole is calculated based on the diameter of the borehole and the thickness of the sand pack
below the bentonite seal. The volume of the tubing is based on the inner diameter of the tube and
the length of tubing used. The purging is conducted using a 60 milliliter (mQ syringe. The volume
of the syringe is divided into the volume of the borehole and tubing. This value is multiplied by four
and rounded up to determine the number of syringe volumes required to purge the borehole prior
to sampling. The purge will occur at a maximum rate of three syringe discharges per minute (180
mL/min). When the gauge reads 5 inches mercury, the vacuum is recorded and the sampling valve
on the Summa is closed (after approximately five minutes).
All proposed soil gas sampling locations are temporary. For sub -slab soil gas locations, Vapor Pins
will be removed using a task -specific extractor tool and the holes will be filled to floor surface using
quick -setting hydraulic cement. The tubing used in connection with exterior soil gas sampling will
be pulled out of the boring or cut to land surface and the sample location will be covered with
asphalt patch.
Primary and duplicate soil gas samples will be collected from the same sampling location
sequentially where noted in Table 2a. Once the primary sample is collected, the duplicate summa
canister and regulator will be attached to the sample port and leak -tested. If the seal around the
VaporPin and sampling train fittings are considered acceptable, the duplicate sample will be
collected as described above. Mid -Atlantic personnel will note slab thicknesses, material
underneath the concrete slabs where applicable, and provide soil boring logs for where exterior soil
gas sample points were installed.
SECTION 4 LABORATORY ANALYSIS
Soil samples will be submitted to Waypoint Analytical laboratory (Waypoint, NC Certification
Number 402). Composite samples will be analyzed for SVOCs by EPA Method 8270E and RCRA
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8 metals by 6020B and 7471 B as shown in Tables 2a and 2b. The beneficial fill soil assessment
sample exhibiting the greatest concentration of total chromium will be analyzed for hexavalent
chromium by EPA Method 7199. Soil grab samples will be tested for VOCs by EPA Method
8260D. Standard hold times for these analyses are not expected to cause scheduling, shipping or
quality control issues. Reporting limits and method detection limits will meet applicable screening
criteria including the reporting of estimated concentrations as "J" flags. Laboratory Level II QA/QC
will be provided. There will not be limitations on which soil constituents are reported by the
laboratory.
Groundwater samples will be submitted to Waypoint. Groundwater samples will be analyzed for
VOCs by EPA Method 8260D, SVOCs by EPA Method 8270E and RCRA 8 metals by 6020B and
7471 B as summarized in Table 2a. Standard hold times for these analyses are not expected to
cause scheduling, shipping or quality control issues. Reporting limits and method detection limits
will meet applicable screening criteria including the reporting of J-Flags. Estimated
concentrations will be reported as "J" flags. Laboratory Level II QA/QC will be provided.
Soil gas samples will be submitted under proper chain -of -custody to Con -Test Analytical
Laboratory (Con -Test) of East Longmeadow, Massachusetts (an AIHA-LAP certified laboratory,
lab ID LAP-100033) for analysis. Soil gas samples will be analyzed for VOCs in accordance with
the EPA Compendium Method TO-15. The sampling and analysis plan for soil gas is summarized
in Table 2a. Reporting limits and method detection limits will meet applicable screening criteria
including the reporting of estimated concentrations as "J" flags. Laboratory Level II QA/QC will be
provided. There will not be limitations on which soil gas constituents are reported by the
laboratory (with the exception of acrolein).
SECTION 5 QA/QC
Two duplicate soil samples (one composite and one grab) will be collected in the field and will be
analyzed by EPA Methods 8270E and 6020B/7471 B (composite sample) and 8260D (grab
sample; Tables 2a and 2b). Care will be taken to ensure that a sample location exhibiting evidence
of impacts will be used to collect the duplicates, if applicable. The chain -of -custody will be
completed in the field and packed with the samples. The Mid -Atlantic field technician will return to
the office with the packed cooler which will be delivered to the laboratory located in Charlotte, North
Carolina using the laboratory -provided courier service.
One duplicate groundwater sample will be collected and analyzed for VOCs by EPA Method
8260D and SVOCs by EPA Method 8270E (Table 2a). One laboratory -prepared trip blank per
cooler will be analyzed for VOCs by EPA Method 8260D. We anticipate one cooler will be of
sufficient capacity to transport all groundwater samples described in this Work Plan. The chain -of -
custody will be completed in the field and packed with the samples. The Mid -Atlantic field
technician will return to the office with the packed cooler which will be delivered to the laboratory
located in Charlotte, North Carolina using the laboratory -provided courier service.
One duplicate soil gas sample will be collected per day of soil gas sampling. Since the sub -slab soil
gas sampling and the exterior soil gas sampling may be conducted on separate days, two
duplicate soil gas samples (one sub -slab and one exterior soil gas) will be collected in the field and
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will be analyzed by EPA Compendium Method TO-15 (Table 2a). If the seal around the VaporPin
and sampling train fittings are considered acceptable, the duplicate sample will be collected as
described above.
The laboratory provided Summa canisters will be closed with a final vacuum in the canister is at
least five inches of mercury to assist in the evaluation of sample integrity during transit. The chain -
of -custody forms will be completed in the field and packed with the samples. The Mid -Atlantic field
technician will return to the office with the packed boxes and/or coolers. Soil gas samples will be
shipped to the Con -Test laboratory in East Longmeadow, Massachusetts. The soil and
groundwater samples will be shipped to the Waypoint laboratory in Charlotte, North Carolina using
the laboratory -provided courier service.
SECTION 6 INVESTIGATION DERIVED WASTE MANGEMENT
Investigation derived waste (IDW) generated during this assessment will consist of soil cuttings
from borings advanced for soil sample collection, well construction, and installation of exterior
soil gas points as well as small quantities of concrete dust from the installation of interior sub -
slab vapor sampling probes. In addition, IDW will be generated during the purging and sampling
of the temporary monitoring wells. Since prior assessment has not been conducted at the
subject site, these materials will be containerized in 55-gallon labeled drums. These drums will
be stored onsite and test results from the soil and groundwater testing are available and
appropriate disposal methods are determined.
SECTION 7 REPORTING
Following completion of assessment field activities and receipt of laboratory analytical data, Mid -
Atlantic will prepare a Data Gap Assessment Report to document field activities and provide
analysis of the data collected. Soil analytical data will be compared to the preliminary soil remedial
goals (PSRG). The groundwater test data will be compared to the North Carolina Groundwater
Quality Standards. Soil gas data will be compared to the soil gas screening levels (SGSL). As
appropriate, the analytical data will be evaluated using the NCDEQ risk calculator for cumulative
risk evaluation(s).
• Reporting/summary of site work conducted as outlined above;
• Summary of findings and possible recommendations;
• All applicable tables and figures including tabulated analytical data per media sampled and
compared to the groundwater quality standards, PSRGs, SGSLs, cumulative risk
evaluations, figures depicting actual sample locations and a groundwater potentiometric
map (with scale and north arrow);
• Detail on building additions slab types and sub -grade features such as the locations of
crawl spaces, tunnels, basements, sub -grade walls, and footer walls encountered during
assessment;
• Mid -Atlantic's PE/PG License Number; and
• The Professional Engineer's or Licensed Geologist's individual PE/LG seal and signature.
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SECTION 8 TABLE FORMAT AND FIGURES
This Work Plan contains the following tables, figures and appendices. These attachments contain
the following information.
Table 1 — Property Summary
For each property included in the Work Plan, this table lists the Brownfield Project number,
parcel number address, acreage, former and current uses, recognized environmental
conditions and proposed uses.
Tables 2a and 2b — Sampling Summary
For each sample point included in the Work Plan, this table lists the data gap,
parcel/building number, sample objective, type of sample, number of samples, depth of
samples, analytical program, TCE detection range.
Figure 1 — Topographic Site Map
A topographic base map with north arrow, graphic scale and site outline
Figure 2 — Proposed Redevelopment Map
A site map that includes current and proposed structures, Brownfield Property boundary,
identifies structures to be removed or renovated and proposed future use of each building.
Figures 3a and 3b — Proposed Sample Location Map
A site maps that include, as appropriate, high quality areal photograph with planned
building layout, north arrow, graphic scale, historical sample locations (none for this
project), areas of environmental concern, soil cut locations, proposed soil, groundwater and
soil gas sample locations, and sample identification labels.
Appendix A - Tabular Summary of Historical Data
Since this site has no prior sampling data, this appendix is blank
Appendix B — Completed Vapor Intrusion Assessment Work Plan & Report Checklist, July 2021
Contains the completed checklist
Mid Atlantic

TABLES
0 Mid Atlantic

TABLE 1
Property Summary
SouthBank Building, 400 West Main Street
Durham, North Carolina
Brownfield
Project
Parcel ID
Address
Acreage
Former/Current Use
Proposed Use
Number
Historic use for dry cleaning,
auto repair, steam laundry
25022-21-032
0821-08-88-2084
400 West Main Street
1.8
and auto filling station
Mixed use, retail and multi -family
(USTs). Current use as a
residential
seven -story commercial
building

TABLE 2a
Areas of Environmental Concern Sampling Summary
SouthBank, 400 West Main Street
Durham, North Carolina
Data Gap
Parcel ID
Sampling Objective/Location
Sample Name
Type Sample
Default Sample
De th*
Analytical Program
Soil
0821-08-88-2084
Historical Dry Cleaner
SS-1
Soil, Grab
5 feet
EPA 8260D, 8270E
and RCRA Metals
Historical USTs and Auto Repair
SS-2
10 feet
Historical Dry Cleaner
SS-3
5 feet
Historical UST
SS-4
10 feet
Historical Steam Laundry and Auto Repair
SS-5
5 feet
Historical Auto Repair
SS-6
5 feet
Groundwater
Historical Dry Cleaner
TMW-1
Groundwater, Grab
30 feet
EPA 8260D, 8270E
and 8 RCRA Metals
Historical USTs and Auto Repair
TMW-2
Historical Dry Cleaners
TMW-3
Historical UST Location
TMW-4
Historical Auto Repair
TMW-5
Historical Auto Repair
TMW-6
Sub -Slab Soil Gas
Evaluate Soil Gas Conditions Under
Existing Slab
SSSG-1
SSSG-2 Soil Gas, Sub -Slab
SSSG-3
0.5 -1 foot (below
slab)
TO-15
TCE< 0.5 ug/m3
Exterior Soil Gas
Evaluate Soil Gas Conditions Under Future
Building, below soil cut
ESGA
Soil Gas, Exterior
15 feet
TO-15
TCE< 0.5 ug/m3
ESG-2
ESG-3
Historical UST Location
ESG-4
5 feet
Historical Auto Repair
ESG-5
Historical Auto Repair
ESG-6
Duplicate Samples**
DUP-SS-2
Soil
10 feet
EPA 8260D, 8270E
DUP-TMW-2
Groundwater
30 feet
EPA 8260D, 8270E
DUP-SSSG-2
Sub -Slab, Soil Gas
1 foot
TO-15
DUP-ESG-2
Exterior Soil Gas
15 feet
TO-15
Notes:
VOCs: Volatile Organic Compound by EPA Method 8260D.
SVOCs: Semi -Volatile Organic Compounds by EPA Method 8270E.
RCRA: Resource Conservation and Recovery Act by Methods 6020B and 7471 B.
,*Depth Below Land Surface.
**Duplicates to be collected from samples that appear contaminated, if identifiable in the field.
Default sample depth used if Feld evidence does not suggest and alternative sample depth.

TABLE 2b
Beneficial Fill Sampling Summary
SouthBank Building, 400 West Main Street
Durham, North Carolina
Block
Approximate
3
Volume yd
BoringSoil
Count per
Block
Sample
Name
Boring Depth*
(ft)
Layer
thickness (ft)
Sample Depth* (ft)
VOCs
SVOCs
RCRA
Metals***
A
760
5
Blk-A
1
1
1.0
G
C
C
Blk-B(s)
2.5
B
1976
4
10
5
G
C
C
Blk-B(d)
7.5
C
1976
4
Blk-C(s)
10
5
2.5
G
C
C
Blk-C(d)
7.5
D
1740
4
Blk-D(s)
12
6
3.0
G
C
C
Blk-D(d)
9.0
Blk-E(s)
3.0
E
1740
4
12
6
G
C
C
Blk-E(d)
9.0
Blk-F(s)
3.0
F
1712
3
12
6
G
C
C
Blk-F(d)
9.0
Blk-G(s)
3.0
G
1640
3
12
6
G
C
C
Blk-G(d)
9.0
Blk-H(s)
2.0
H
1322
3
8
4
G
C
C
Blk-H(d)
6.0
Duplicate
Sample**
1
1
1
Totals
12866
30
16
16
16
Notes:
VOCs: Volatile Organic Compound by EPA Method 8260D.
SVOCs: Semi -Volatile Organic Compounds by EPA Method 8270E.
RCRA: Resource Conservation and Recovery Act by Methods 6020B and 7471 B.
*Depth Below Land Surface.
**Duplicates to be collected from samples that appear contaminated, if identifiable in the field.
***Hexavalent Chromium: Soil sample with highest total chromium concentration will also be analyzed for hexavalent chromium by Method 7199.
Default sample depth used if field evidence does not suggest and alternative sample depth.

FIGURES
0 Mid Atlantic

a
1. DURHAM SOUTHWEST AND NORTHWEST, NC DIGITAL RASTER GRAPHICS,
USGS. SCANNED FROM 1:24,000 TOPOGRAPHIC MAPS, PUBLISHED 2019, USGS.
2. PROPERTY BOUNDARY DATA FROM DURHAM COUNTY GIS.
Mid Atlantic
Engineering & Environmental Solutions
TOPOGRAPHIC SITE MAP
SOUTHBANK BUILDING
400 WEST MAIN STREET
DURHAM, NORTH CAROLINA
SCALE: 1:12,000
Feet
0 1,000 2,000
DRAWN
DATE:
BY:
KRC
SEPTEMBER 2021
DRAFT
JOB NO:
CHECK:
DHN
00OR3710.00
ENG.
GIS NO:
CHECK:
DHN
3G-R3710.00-1
APPROVAL: DHN
DWG NO: 1

N
4
��-
LA
1
AMA
my
I
\ yhoe
Extent of Proposed Mixed -Use.
♦ Retail and Apartment Structure;
Current Bank/Office Building
(To Be Demolished)
7 if74
A -boD
Legend
Planned Structure
1 IWh = 50 feet - Brownfields Property Boundary
0 50 100 200 300 - Parcel Boundaries
Feet
DRAWN BY: KRC DATE: SEPTEMBER 2021
PROPOSED REDEVELOPMENT MAP DRAFTCHECK
Mid Atlantic SOUTHBANK BUILDING JOB NO.: R3710.00
400 WEST MAIN STREET BYGINEERCN CHECK GISNO.: 3G-R3710.00-2
Engineering &Environmental Solutions DURHAM, NORTH CAROLINA APPROVED
BY DHN DRAWING NO.: 2
REFERENCE: DATA FROM NC ONEMAP. EDR CERTIFIED SANBORN MAP REPORT. BASEMENT AND GROUND FLOOR BLUEPRINTS FROM LS3P ASSOCIATES LTD.

- Historical UST Location
and Automotive Repair
ESG71— SS-2/TMW-2_y
Historical UST Location
• R � SS-4/TMW`4/ESG-4 I - 1�i"
=ESG=2
Historical Automotive Repair —
I
S _ _."TMW-6/ESG-6 T ��� '
18'� 1/2" 2fi 12' urn en• -- t .�
� SSSG-1 1
1 1 __
SS-5/TMW-5/ESG-5 Historical jlp
Dry Cleaners a �!
SSSG-2.;
Al2a'ry'®
Historical Steam
fi
I$]
50 100
J1 i nch _ 5i
f '
1 /TMW=
�I
I
li
'ZIR
♦ t w
-3
K- -------------
-- --,M-
200
300
= Feet
'Historical_ ■D.ry Cleaner
;•t
Legend
❑ Proposed Soil Sample, Temporary Well, and Soil Gas Sample
Proposed Soil Sample and Temporary Well
0
Proposed Soil Gas Sample
Proposed Sub -Slab Sample
Basement Area
Ground Floor Area
DRAWN BY: KRC
DATE: SEPTEMBER 2021
ENVIRONMENTAL AOC SAMPLE LOCATION MAP
DRAFT CHECK
• :•.
M id Atlantic
SOUTHBANK BUILDING
BY: DHN
JOB NO.: R3710.00
400 WEST MAIN STREET
ENGINEER CHECK
GIS NO.: 3G-R3710.00-3A
Engineering &Environmental Solutions
DURHAM, NORTH CAROLINA
APPROVED
BY DHN
DRAWING NO.: 3A
REFERENCE: DATA FROM NC ONEMAP. EDR CERTIFIED SANBORN MAP REPORT. BASEMENT AND GROUND FLOOR BLUEPRINTS FROM LS3P ASSOCIATES LTD.

N - � "
Al ;
�;- AREA B AREA C
C-4 _
--
- .. � �' AREA AREA D AREA E i
Aw
` t 1
41
Id
A-3 , .fir- < ` • _
• F-2
A-5
,� AREA F
AREA G
G-1 O _ G-3
G-2
. #14 o Legend
H-1 0 AREA H
2 0 Site Boundary
H-3 ,
.� •t 0 Proposed Soil Sample Location
4 r -
'� 0-1 ft Cut
a /
0-8 ft Cut
0-10 ft Cut
1 inch - 50 feet ,f! E-
0-12 ft cut
0 50 100 200 300 � � r
Feet Parcel Boundaries
DRAWN BY: KRC DATE: SEPTEMBER 2021
BENEFICIAL FILL ASSESSMENT DRAFTCHECK
Mid Atlantic SAMPLE LOCATION MAP JOB NO.: R3710.00
400 WEST MAIN STREET BYGINEERCN CHECK GISNO.: 3G-R3710.00-3B
Engineering &Environmental Solutions DURHAM, NORTH CAROLINA APPROVED
BY DHN DRAWING NO.: 3B
REFERENCE: DATA FROM NC ONEMAP. CUT FILL MAP FROM STEWART ENGINEERING.

ATTACHMENT A
COMPLETED VAPOR INTRUSION ASSESSMENT WORK PLAN
& REPORT CHECKLIST
Mid Atlantic

PRELIMINARY NCDEQ BROWNFIELDS PROGRAM GUIDANCE
Vapor Intrusion Assessment Work Plan & Report Checklist
NCDEQ Brownfields Program
July 2021
This guidance is to be used for Brownfields Properties to evaluate vapor intrusion concerns.
Vapor intrusion (VI) assessment work plans and reports for NC Brownfields properties must use
this checklist. The completed checklist must be provided with each of the submitted work plan
and subsequent report documents and confirm the following:
• The type of information detailed below has been included; and
• The format and tables provided below were used to complete the work plan.
The benefits of following this checklist include:
• Consistency and predictability in the assessment process;
• The most efficient process for preparing and reviewing work plans and reports
prepared for Brownfields properties;
• Maximize usability of the data by the NC Brownfields Program;
• Minimize DEQ review time; and
• Reduce costs and delays associated with additional mobilizations.
Assessment that is conducted without approval from the NC Brownfields Program is done at
your own risk and may not be accepted by the Brownfields Program. The Program will be using
this checklist to conduct its reviews.
The VI assessment work plan and report must be signed and sealed by a NC licensed geologist or
engineer.
Plan to allow sufficient review time for Work Plans and Reports. The Program is in high
demand and your Brownfields Project Manager is managing multiple projects. The DEQ
Brownfields Program has a vested interest in keeping all of our projects on schedule, including
yours. To help, you should maintain close coordination and consultation with your Brownfields
Project Manager (whether it's with the Brownfields agreement development staff or with the
Property Management Unit staff afterwards) to determine an approximate time range for review
and allow for that in planning your project schedule. The Prospective Developer, their technical,
and legal team shall coordinate to ensure the validity of collected data which forms the basis for
environmental risk decision making regarding vapor intrusion potential and mitigation measures
at the Brownfields Property.
Note: Work plans that follow this checklist outline can be submitted either as a standalone
document or as part of a work plan that encompasses other assessment activities (i.e. soil,
groundwater, etc.) required by the Brownfields Program.
VIMS Assessment Checklist Version 1, July 2021

Title Pale
The title page should include the following information.
{'Title of work plan or report
B"Brownfields Project Name (not the development name)
DZ/Brownfields Project Number
IxTate (updated with each revision)
evision Number
Y!J Firm PE/PG License Number
�`Codividual PE/PG seal & signature
ntact information for Developer, Consultant, and Project Manager (or BPMU Staff)
Section 1 — Introduction
Provide a BRIEF summary of the history of the property that contains the following:
L"History in the Brownfields Program or involvement by another DEQ Section such as
DWA
Yrovide a chronology of former and/or current uses
ist potential sources of vapor intrusion (e.g. off -site migration of contaminants, on -site
releases, chlorinated solvent use, especially the presence or suspected presence of
trichloroethylene (TCE), groundwater contamination, and preferential pathways such as
utility corridors
VList RECs from a Phase I ESA and their location on the Brownfields Property
2"Provide a conceptual site model for the Brownfields Property on which to base the data
gap evaluation
C Indicate if the scope of work was negotiated during a Brownfields Data Gap Meeting, etc.
Provide a summary of the redevelopment plans for the Brownfields Property that contains the
foll;Type
ng:
of proposed use (townhomes, apartments, mixed -use, retail, etc.)
E�rbemolition, new construction and foundation type
�tuse of existing structures
rte_sence of elevators & stairwells
RfJow the new building configuration/parking areas relate to the location, if known, of
contamination at the Brownfields Property
R'froposed and existing building/unit square footage to be assessed.
E Indicate that the proposed use has been approved or is under evaluation by the
Brownfields Program at the time of submittal.
G�nclude a discussion of the following and reference each appendix or attachment where
located:
54igure 1 - Site location map on USGS topographic map, north arrow,
graphic scale, site outline
E Figure 2 — see format requirements in Section 8 below - Site redevelopment
plans superimposed on a high -quality aerial photograph of the site
VIMS Assessment Checklist Version 1, July 2021

2/Table 1 — see example Tables in Section 8 below: With property identifying
information in a summary table format: Brownfield Project Number, Parcel
Number(s), address, site acreage, former or current use, & proposed use
Section 2 — Sco a of Work
Provide a general description of proposed scope of work covered in this plan (e.g., 5
sect 2 • soil gas sampling points, 6 sub -slab points, 4 indoor air, 1 ambient air); Note for any
Brownfields Property, baseline data for each applicable environmental medium as
determined by DEQ is required.
Discuss samples to be collected by media and source area/location. Generally, the
reasoning for the sample locations selected.
93"'I'nclude a discussion of the following and reference each appendix or attachment
where located:
EIT-able 2 — see example Tables in Section 8 below - Briefly list and describe
the vapor intrusion data gaps the assessment is attempting to fill and note other
pertinent information in a sampling summary, including background and
QA/QC samples.
D'Figure 3 — see format requirements in Section 8 below - Proposed Sample
Location Map - Provide a figure in the work plan noting the location of each of
the proposed soil gas, sub -slab, or indoor air samples overlain with planned
building layouts, historical areas of concern, and previously identified impacts.
Note that DEQ DWM VI Guidance states that "Due to spatial variability in sub -slab soil gas
concentrations over a slab, DWM generally recommends the collection of one sample per 1,000
square feet of first floor building area." Sampling density could vary due to site -specific
considerations, and with prior approval from DEQ.
Section 3 — Sampling Methodology
For all air sampling planned, provide the following information in relevant section 3.a or 3.b
discussed below:
Deference the most current versions of DEQ DWM and ITRC guidance documents
applicable to vapor intrusion sampling, and any other applicable standard operating
procedures. Note any deviations or methodology planned that is not covered by such
guidance.
❑ Discuss timing of sampling and whether indoor air and sub -slab sampling will be
I „o+ occurring contemporaneously; if so plan to conduct indoor air sampling first so that the
. o�tion of the sub -slab point does not influence the indoor air data.
crestate the analytes for which each sample will be analyzed for (briefly) and include the
analytes that are specifically being requested for reporting. Reference Table 2.
Cndicate if mercury has previously been assessed for/detected in soil or groundwater
3, �"� and hether mercury vapor intrusion concerns are present.
i; Discuss how and when vacuum readings will be collected (for Summa canisters) —
field vacuum readings should be recorded on the chain of custody forms for ease in
comparing to reported laboratory receipt vacuum readings.
VIMS Assessment Checklist Version 1, July 2021

Note: Per DEQ DWM VI Guidance, Summa canisters that have lost greater than 10% of the
initial recorded lab vacuum when received in the field will not be used for sampling. It is
assumed that Summa canisters are issued with a maximum achievable pressure of 30" Hg. If
canisters are received in the field with less than 27" Hg, initial lab pressure measurements should
be documented to confirm less than a 10% volume loss or a replacement summa canister
obtained. Otherwise, sample results may be rejected.
0 'Provide the sample collection time duration for all samples.
CIState how duplicate sample(s) will be collected.
vn 21ndicate a targeted final vacuum reading of at least -5" Hg. Note if the vacuum
measurement is less than this, sample acceptance will be in jeopardy and DEQ
Brownfields may request a resample.
2 fnclude planned flow rate for Summa canister sampling or time allotting for passive
samplers.
Note: Per DEQ DWM VI Guidance, the maximum allowable flow rate is 200 mL/min.
Sec ion 3.a. Exterior Soil gas / Sub -Slab Sampling
Se
depths of samples to be collected (Reference example Table 2 in Section 8
below) or how that decision will be made in the field, if needed. Refer to DEQ DWM
Valor Intrusion Guidance for reference to minimum depths of samples.
ocate sub -slab samples in areas of the slab that are near known or potential sources of
volatile contaminants and in areas that could encourage vapor migration, such as sub -
grade trenches, pits, and elevator shafts, but position them at least 5 feet from exterior
walls or cracks/penetrations.
P<ocate sub -slab samples across the building(s) being assessed being mindful of any
building features that could indicate the presence of sub -walls or footers that would
restrict sub -slab vapor flow.
Describe installation methodology construction details of the sub -slab and/or soil
vapor samples, including filter pack and sealants. Use of new and dedicated tubing is
Med.
scusss sample collection procedures. Include the following, at a minimum:
Ltd Equipment to be used (Summa canisters & size, type of tubing, vapor pins,
etc.)
PrIndicate if sub-slab/exterior soil gas sample points will be permanent or
tem orary.
Mether Summa canisters are batch- or individually -certified.
"iscuss stabilization time of the sampling points prior to sampling.
Note: Inadequate stabilization times have been known to impact sample results through the
inadvertent collection of vapors off -gassing from soil gas/sub slab installation materials,
potentially creating false positive results that would then require a resampling event.
Recommended stabilization times are outlined below:
VIMS Assessment Checklist Version 1, July 2021

a. Sub -slab with minimally invasive points (e.g. Vapor Pins): Manufacturer's
guidelines generally suggest 20 minutes may be sufficient with an airtight cap
installed;
b. Sub -slab points (other than minimally invasive points): at least 24-48 hours
(to be purged at installation and at time of sampling with an air -tight cap in
place in the interim); or
c. Exterior soil gas points: 48 hours to allow materials used during installation
to off -gas prior to sampling (to be purged at installation and at time of sampling
with an air -tight cap in place in the interim).
71 escribe purging methods and volumes — must take into account not only the volume
of the tubing but also of the annulus. Stagnant air inside soil gas probes and sampling
trains must be purged prior to sample collection. Three to four system purge volumes are
recommended as a minimum value. The investigator should use a low purge rate with a
maximum of 200 mUmin.
U45escribe leak check procedures for sub -slab and soil gas samples. Note: helium check
of entire sample train is required; a shut-in test is also recommended as a best
management practice.
VDescribe how the helium meter will be connected to the sampling train. Note that
directly connecting the helium meter to the sampling train without a backflow preventer
is no allowed.
C Zecord the type of material found under the slab or in the soil gas borings.
R<ecord slab thickness for sub -slab samples and provide soil boring logs for soil gas
Wles.
('Discuss sample point abandonment and/or securement (if permanent points)
Note: Exterior soil -gas sampling may not necessarily be indicative of site conditions following
redevelopment efforts and confirmation sub -slab sampling may be necessary following
construction to confirm that a potential vapor intrusion pathway is not present.
Section 3.b. Indoor Air / Crawl Space Sampling
❑ Include a chemical survey of any potential interference compounds stored or used
inside the building (Refer to example Indoor Air Building Survey and Sampling Form
that will be completed for each distinct area of the Brownfields Property under
�or'
assessment. The Indoor Air Form is included within the DEQ DWM VI Guidance).
❑ Describe steps to remove any potential interference compounds from the sampling
area sufficiently ahead of the sampling event (The DEQ DWM VI Guidance recommends
removal within 24-72 hours and typically within 48 hours of sampling as indicated on the
Indoor Air Building Survey and Sampling Form).
❑ Schedule sampling to minimize any potential for interference from compounds used
during construction or finishing of new buildings, etc. Describe any sampling
constraints.
❑ Describe building conditions (including HVAC conditions) that will exist within 24
hours prior to and during the sampling.
❑ Discuss sample collection procedures. Include the following, at a minimum:
VIMS Assessment Checklist Version 1, July 2021

❑ Equipment to be used (passive samplers, Summa canisters & size, etc.)
❑ Placement height of Summa canisters or passive samplers for indoor air and
ambient air collection to account for site specific breathing zone height of
anticipated occupants.
/ ❑ Description of the indoor air summa canisters or passive samplers proposed
placement location including use of space (e.g., ground floor garage, first floor
living space, office, mechanical equipment room, etc.).
V� El Methods implemented to reduce or eliminate access to building where indoor
19air sampling is occurring
❑ Whether Summa canisters are batch- or individually -certified. Note: per
DEQ DWM VI Guidance, indoor air samples should utilize individually
certified Summa canisters
❑ Provide how often and when exterior ambient air samples will be collected (typically,
one sample per day per sampling event)
❑ If crawl space samples are proposed, include details on:
❑ Presence of moisture/VI barrier
❑ Ceiling structure of crawlspace
❑ Exterior openings or ventilation features
❑ Height across entire footprint of crawl space
❑ Walls/vertical structures separating crawl space areas
❑ Additional pertinent details of crawl space construction
Section 4 _ Laboratory Analvses
El Include the proposed analyte list and EPA Method numbers prepared in consultation
wip your DEQ Brownfields Project Manager;
Minimum analytical requirements are described as outlined below:
a. Full TO-15 list is required initially for soil gas, sub -slab, and indoor air analyses.
b. Subsequent modifications of the analyte list, e.g., once sub -slab gas results are
known, may be made with advance approval from your Brownfields Project
Manager.
Note: Not all laboratories use the same standard analyte list. Ensure that naphthalene is
included, but exclude acrolein unless it is a suspected site contaminant. Because of the
extremely limited analyte list for the TO-15 SIM method, discuss its use with your DEQ
Brownfields Project Manager prior to implementation. When approved for use, this method
should be used for both sub -slab and indoor air samples for comparison purposes.
(Discuss any proposed limitations on the contaminants of concern, if any, and the
reaas'n for such. limitation (sufficient previous data, indoor air interferences, etc.).
13 Discuss laboratory certifications. Please note, NC does not certify laboratories for air
sa les. Please specify what certification the proposed air laboratory holds.
dicate the Reporting Limits/Method Detection Limits will meet applicable screening
criteria (to the extent feasible). Include reporting of J-flags to meet criteria.
VIMS Assessment Checklist Version 1, July 2021

CK Indicate what Level QA/QC will be reported by the laboratory. Level II QA/QC is
typically acceptable.
Section 5 — A/ C
Specify the duplicate sample frequency. Minimum requirement: 1 duplicate per 20
samples, per media, per method, per day of sampling.
EU4)iscuss chain of custody and shipping.
Section 6 — nvesti ation Derived Waste ID Management
Discuss what IDW will be generated and how it is proposed to be managed.
Management recommendations should be in accordance with 15A NCAC 02T.1503 and
15A NCAC 02H. 0106. Generally, if the Brownfields Property has not previously been
assessed, all IDW must be containerized and characterized prior to management.
Previous assessment data that indicate no Hazardous Waste (listed or characteristic) is
likely to be encountered in the area of proposed assessment will be required before thin
spreading of IDW on -site is permitted.
Section 7 — Reporting
This section should discuss the components of the assessment report which will be prepared as a
result of the implementation of the work plan. At a minimum, the report shall include:
CVZeporting/summary of site work conducted for all sections outlined above in this
checklist;
Summary of findings and possible recommendations;
Q"All applicable tables and figures outlined below with the addition of:
EKT—ables for tabulated analytical data per media sampled and analyzed, compared against
applicable screening levels; any non -detectable levels should be reported as less than the
applicable reporting limit noting any reporting limits that exceed the respective screening
level.
Vigure(s) depicting actual sample locations, with the results for each media depicted,
graphic scale and north arrow. Modify the figures as appropriate in the report if there was
variance with these locations during the sampling event;
0 Detail on building additions, slab types and sub -grade features such as the locations of
crawl spaces, tunnels, basements, sub -grade walls, and footer walls encountered during
assessment.
ffFirm PE/PG License Number; and
2Individual PE/PG seal & signature
VIMS Assessment Checklist Version 1, July 2021

Section 8 - Example Tables and Format for Figures
Er Table 1 - Property Summary
Table 1: P operty Summary
Former/
BF Project No.
Parcel
Address
Site
r nt
Current
REC
Proposed
No
Acreage
e
Use
2"T' able 2 - Sampling Summary
Table 2: Sampling Summary
� s a� /2
Data
Parcel/Bldg
Sampling
Type
of
Number
of
Depth
of
Analytical
Detection
range for
Gap
No.
Objective
Sample
Samples
Samples
Program
TCE (if
applicable
Figure 1 - Site Location Map (topographic map base) with north arrow, graphic scale, and
site outline.
[ Figure 2 - Proposed Redevelopment to include the following details:
2All current and proposed structures
D19rownfields Property Boundary
0-Which structures will be removed/renovated
Oproposed future use of each building
dFigure 3 - Proposed Sample Location Map (work plan) or Sample Location Map to include
the following details:
3 % 2"Hf igh quality aerial and/or floor plan base (interior samples)
Overlain planned or existing (to remain) building layout
E(North arrow
ErGraphic scale
❑ Historical sample locations (if applicable) ►k�'G v�� ����
ff RECs or other areas of concern
WS
� . roposed sample locations for each medium proposed for sampling
© ample identification labels
❑ Appendix - Tabular Summary of Historical Analytical Data I �
aPP1'�`�
VIMS Assessment Checklist Version 1, July 2021

ATTACHMENT B
TABULAR SUMMARY OF HISTORICAL ANALYTICAL DATA
Mid Atlantic

NOT APPLICABLE
NO PREVIOUS ENVIRONMENTAL ASSESSMENT
DATA AVIALABLE