13025_Davis Dr_Work Plan and NCBP approval letter_2021.10.18

October 18, 2021
Sent Via E-mail
Brad Blalock
HSE Manager II
Syngenta Group
9 Davis Drive, RTP, NC 27709
[e-mail]
Subject: Work Plan Approval
Brownfields Project: Davis Drive
9 Davis Drive
Raleigh, Wake County
Brownfields Project Number: 13025-09-032
Dear Blalock:
The North Carolina Department of Environmental Quality (DEQ) Brownfields Program received
the Work Plan for Groundwater and Soil Gas Assessment dated October 18, 2021 (Work Plan).
The Work Plan has been reviewed and is approved.
Please be advised that this approval from DEQ Brownfields does not waive any applicable
requirement to obtain any necessary permits, licenses or certifications which may be required from
other state or local entities. If you have any questions, please feel free to contact me at 919-707-
8382, or via e-mail at [e-mail]
Sincerely,
Sarah H. Young
Supervisor
Brownfields Property Management Unit
ec: Mike Pfeifer, S&ME
Samuel Watts, PG, S&ME
Buddy Bowman, Syngenta Group

Work Plan for Groundwater and Soil Gas Assessment
Brownfields Project Name: Davis Drive
Brownfields Project No.: 13025-09-032
S&ME Project No. 214045

PREPARED FOR:
35 North
4601 Creekstone Drive
Durham, North Carolina 27703
PREPARED BY:
S&ME, Inc.
3201 Spring Forest Road
Raleigh, NC 27616

Corporate Registration for Licensing of NC Geologists No. C-145
NC Engineering Firm No. F-0176

October 18, 2021

Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 1

Table of Contents
1.0 Introduction ....................................................................................................................... 3
2.0 Scope of Work .................................................................................................................... 4
2.1 Basis and Approach ....................................................................................................................... 4
2.2 Project Management, Health and Safety Plan, and Coordination ........................................... 4
2.3 Schedule ........................................................................................................................................... 5
3.0 Sampling Methodology ................................................................................................... 5
3.1 Soil Gas Sampling ........................................................................................................................... 5
3.1.1 Sample Locations ............................................................................................................................... 5
3.1.2 SGI Sampling Train Setup and Helium Leak Test Methodology ..................................................... 6
3.1.3 Soil Gas Sampling Methodology ....................................................................................................... 7
3.2 Groundwater Sampling ................................................................................................................. 8
4.0 Laboratory Analysis .......................................................................................................... 9
5.0 Quality Assurance/Quality Control .............................................................................. 9
5.1 Field and Laboratory Control Duplicates ................................................................................... 9
5.2 Sampling Equipment ..................................................................................................................... 9
5.3 Sample Custody ............................................................................................................................ 10
5.4 Laboratory Analytical Report ..................................................................................................... 10
6.0 Investigative Derived Waste (IDW) Management and Disposal .......................... 10
7.0 Reporting .......................................................................................................................... 10
8.0 References ......................................................................................................................... 11

List of Attachments
Figure 1 – Site Topographic Map
Figure 2 – Sample Location Map
Figure 3 – Historical Sample Location Map
Figure 4 – Detail of Historical Sample Location Map
Figure 5 – Site Grading Plan
Table 1 – Sample Point Information
Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 2
Table 2 – Historical Soil Gas Sampling Data

Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 3
1.0 Introduction
S&ME, Inc. (S&ME) on behalf of our client, 35 North, is submitting this Work Plan to conduct groundwater and soil
gas assessment activities at the Brownfields Project Site: Davis Drive (Brownfields Project No.: 13025-09-032). Our
client, 35 North, intends to develop the Site under the North Carolina Department of Environmental Quality
(NCDEQ) Brownfields Program (NCBP). The referenced property is located at 9 Davis Drive, Research Triangle
Park, North Carolina, and is owned by Syngenta. A site vicinity map is provided as Figure 1. A site map is
provided as Figure 2.
According to the Brownfields Agreement for the site (dated October 4, 2013), the site is approximately 50.38 acres
(Durham County Tax PIN 0748-03-21-3871). Hercules, Inc. formerly owned and operated the site from 1967
through 1978. The site was used for a research and development laboratory for their fiber division. An
approximate 130,000-square foot, two-story office and laboratory building, and an attached multi-story fiber spin
tower were present at the site. Raw materials and solvents were used to form a polyester fiber known as
“Herculon”. Hercules also reportedly maintained an on-site dry cleaning operation to test the fibers. The
chemicals from the dry cleaning operation were reportedly allowed to drain directly onto the ground surface;
however, the location of the chemical draining is unknown.
Between 1978 and 1997, the property was leased to IBM as a training facility. Chlorinated solvents were detected
in the groundwater at the site during several environmental property assessments conducted by others in 1996.
In addition, a 20,000-gallon fuel oil underground storage tank was permanently closed in 1996.
According to a 1996 Comprehensive Site Assessment (CSA) conducted by Environmental Resources Management,
several chlorinated solvent compounds were detected in groundwater samples in concentrations exceeding their
respective regulatory standards. The CSA recommended monitored natural attenuation for the site.
Subsequent environmental reports prepared by others between 1996 and 2011 indicated that VOCs were present
in the groundwater in the southeast corner of a former parking lot. In 2011, Syngenta announced plans for new
biotechnology research facility at the site. As part of due diligence for the proposed new construction, nine soil
vapor samples were collected in the proposed area of development. The laboratory analytical results of the soil
vapor samples indicated that the chlorinated solvents 1,1-dichloroethene and vinyl chloride, and the petroleum
hydrocarbon benzene exceeded their respective regulatory screening levels.
Section 8.0 in this Work Plan includes a list of assessment reports, relevant to the Davis Drive Site, which were
considered in preparing this assessment work plan. Figure 3 depicts locations of previous soil, groundwater, soil
gas, and sediment samples collected over the assessment history of the site and Figure 4 shows detailed locations
of former soil gas samples.
The current property owner (Syngenta) is planning a 2-story Insectary structure, (approximately 13,000 square
feet). Only preliminary site grading plans have been developed at this time, and soil excavation (cut) up to 15 feet
below ground surface (ft-bgs) are anticipated. Based on the preliminary grading information provided by
Syngenta, approximately 6,339 cubic yards will be cut from the area of proposed development. The current
ground surface elevation in the proposed development area ranges from approximately 334 feet AMSL to
approximately 318 feet AMSL. The final floor elevation is anticipated to be at approximately 317 feet AMSL. A
preliminary site grading plan, indicating the cut/fill areas is included as Figure 5.
Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 4
2.0 Scope of Work
2.1 Basis and Approach
As indicated previously, Syngenta will be improving the site with a 13,000-square foot structure. A such, S&ME is
proposing to conduct groundwater and soil gas sampling within the proposed structure footprint. The results of
this investigation will be used to determine the need for a vapor mitigation system below the proposed structure.
S&ME will perform the following scope, to further assess onsite media that may have been impacted by historical
use of the site and surrounding properties.
Groundwater Sampling – S&ME will collect three groundwater samples during this assessment. The
groundwater sampling locations are depicted on Figure 2 and have been selected to address areas of concern
and/or fill in analytical data gaps for the groundwater across the site. Results of the additional groundwater
sampling will be used to assess the absence of contaminants of concern in the groundwater across the site and/or
identify areas that may require impacted media management during redevelopment.
Soil Gas Assessment – S&ME will collect up to eight soil gas samples during this assessment. The soil gas
sampling locations are depicted on Figure 2 and have been selected to widely cover the site. The results of the
soil gas assessment will be used to determine the need for a vapor mitigation system beneath the proposed
structure.
2.2 Project Management, Health and Safety Plan, and Coordination
Prior to mobilizing to the site to conduct the proposed sampling, S&ME will conduct the following:
 Update a previously prepared a health and safety plan to comply with currently proposed site activities, in
accordance with 29 CFR 1910.120 as required by the Occupational Safety and Health Administration
(OSHA).
 Contact NC 811 and contract with a private utility location company prior to mobilizing to the site to
locate public underground utilities at the site.
 Contract a North Carolina-licensed surveyor to survey elevations at the existing ground surface where
groundwater and soil vapor samples are to be collected.
 If necessary, obtain a Permit from DEQ, Division of Water Resources for the Construction of a Monitoring
Well, in accordance with 15A NCAC 02C .0100.

Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 5
2.3 Schedule
The field assessment activities are planned to begin in September 2021 (pending NCDEQ approval of this Work
Plan), and will be completed within approximately three weeks. S&ME anticipates submitting a draft summary of
findings approximately one week after receipt of final laboratory results. The general site assessment schedule is
presented below.
Site Assessment Schedule
Task Duration
Project Management, Health and Safety Plan, and Coordination As Needed
Elevation Survey, Groundwater and Soil Gas Sampling 4 days
Laboratory Analysis 2 weeks
Prepare Additional Groundwater and Soil Gas Assessment Report 2 weeks
3.0 Sampling Methodology
Sampling and assessment will be conducted in general accordance with the following guidance manuals:
 NCDEQ Inactive Hazardous Sites Branch (IHSB), Guidelines for Assessment and Cleanup of
Contaminated Sites (July 2021)
 NCDEQ Division of Waste Management, Vapor Intrusion Guidance (March 2018)
 U.S. Environmental Protection Agency (EPA) Region IV Science and Ecosystem Support Division (SESD)
Field Branches Quality System and Technical Procedures (most recent version)
3.1 Soil Gas Sampling
3.1.1 Sample Locations
S&ME proposes to install up to eight soil gas implants (SGIs) for the collection of soil gas samples. S&ME will use
a track-mounted Geoprobe® drill rig with direct push technology to install the soil gas implants (SGIs) for the
collection of soil gas samples. The SGIs will be installed at the locations shown on the attached Figure 2. The
depths of the SGIs will be based upon the final floor elevation of the proposed structure. The targeted depth of
each of the SGIs will be approximately two feet below the level of the final floor elevation. Therefore, the depths
of the SGIs could be as much as 20 feet below the existing ground elevation. If groundwater is encountered prior
to the intended depth of the SGI, then S&ME will install the SGI no deeper than two feet above the apparent
groundwater depth. See the attached Table 1 for the planned depths of the soil gas samples.
Once the boring for the SGI has reached the desired depth, the six-inch stainless steel screen SGI will be installed.
The SGI will be fitted with 0.25-inch Teflon tubing and installed at the base of the boring. Filter sand will be
placed from the bottom of the boring to six inches above the top of the screened interval. A hydrated bentonite
seal will be placed over the top of the filter sand to the ground surface to form a seal. The tubing will be capped
and covered at the ground surface.
Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 6
During the advancement of the soil borings, soil samples will be continuously collected in five-foot long
disposable acetate-plastic sleeves that line the hollow stainless-steel sample probes. The soils from each boring
will be visually classified by S&ME personnel and field-screened with a calibrated photo-ionization detector (PID)
for the presence of volatile organic compounds (VOCs). The soil samples will be screened in approximate two-
foot increments utilizing VOC-free media.
3.1.2 SGI Sampling Train Setup and Helium Leak Test Methodology
Following installation of the SGIs, S&ME will perform a leak test of each SGI. A plastic shroud will be placed
overtop the SGI installation area. The tubing from the SGI will be fitted through the shroud and attached to a
Tedlar bag. S&ME will then inject helium (tracer) gas into the plastic shroud. Three volumes of air will be purged
from each SGI, associated tubing, and borehole annulus (similar to a personal air monitoring pump or peristaltic
pump) at a rate less than 200 milliliters per minute and collected in a Tedlar bag. A Sensidyne Go-Cal Air Flow
Calibrator will be plumbed in the exhaust tubing to measure continuous air flow rates during the purging process.
Following completion of the purging process, the Tedlar bag will be screened with a helium detector. If the tracer
gas is not detected in the Tedlar bag at a concentration greater than 10% of the concentration within the shroud
array, then the SGI will be considered leak free. If leaks are detected, the SGI will be re-installed and re-tested for
leaks. Following a successful leak test, each SGI point will be capped for approximately 48 hours.
No sooner than 48-hours after installation of the SGIs, S&ME will return to the site to connect the summa
canisters to the sampling train and perform a helium test of the entire sampling array. S&ME will perform a
second leak test by attaching a brass T-connector to the end of the SGI tubing and connecting a section of Teflon
tubing to one part of the T-connector and another section will be attached to an individually-certified one-liter
summa canister. A plastic shroud will be placed overtop the SGI tubing array and summa canister. The other
section of tubing from the T-connector will be fitted through the shroud and attached to a Tedlar bag. S&ME will
then inject helium (tracer) gas into the plastic shroud. The shroud will be filled with helium to a concentration of
greater than 90%, while a soil gas sample is collected into a Tedlar® bag through the 1/4” Teflon® sample tube for
onsite sample analysis of helium content.
The photograph below is an example of the sampling array during a leak test.

Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 7
Three volumes of air will be purged from each sampling array (this includes the tubing and borehole annulus)
using a calibrated low flow pump (similar to a personal air monitoring pump or peristaltic pump) at a rate less
than 200 milliliters per minute and collected in a Tedlar bag. A Sensidyne Go-Cal Air Flow Calibrator will be
plumbed in the exhaust tubing to measure continuous air flow rates during the purging process. Following
completion of the purging process, the Tedlar bag will be screened with a helium detector. If the tracer gas is not
detected in the Tedlar bag at a concentration greater than 10% of the concentration within the shroud array, then
the sampling array will be considered leak free. If leaks are detected, the sampling array will be re-built and re-
tested for leaks.
One blind duplicate soil gas sample will be collected and analyzed for the same parameters as the record samples.
The duplicate sampling train will be constructed so that the brass T-connector leading from the end of the SGI
tubing will be connected to an additional T-connector with Teflon tubing. Each end of the additional T-connector
will be connected to an individually-certified one-liter summa canister with Teflon tubing. The helium test of the
entire duplicate sampling array will be performed as described above.
The photograph below is an example of a duplicate sampling train construction.

3.1.3 Soil Gas Sampling Methodology
Upon determining the sampling array is leak free, the valve to the one-liter summa canister will be opened to
allow the collection of the soil gas samples. The sample collection rate will be set with a one-hour regulator with a
flow rate of less than 200 milliliters per minute. Pressure readings of the summa canisters will be recorded at the
start and end of collection. A residual vacuum of up to -5 inches of mercury will exist in the canister upon
completion of the sampling event. The post sampling vacuum rate will be recorded in S&ME’s field
documentation and on the laboratory’s chain of custody forms. The laboratory will record receipt pressures of the
summa canisters. During the sampling event, S&ME will record the temperature, wind speed, weather conditions,
Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 8
and barometric pressure that are recorded at the Raleigh-Durham International Airport weather station via the
National Oceanic and Atmospheric Administration website.
Once the soil gas samples are collected, the samples will be shipped under standard chain-of-custody protocol to
a North Carolina certified laboratory for analysis of VOCs (including naphthalene) by EPA Method TO-15. S&ME
will cap each sampling point after the soil gas samples have been collected.
Upon receipt of the laboratory analyses and approval from the NCDEQ, Brownfields Program, S&ME will re-
mobilize to the site and remove the SGI tubing to approximately one foot below the top of the ground surface
and will fill the top of the boring with soil. Please note that during SGI construction the borehole is filled with
hydrated bentonite clay. The location of the soil gas samples will be recorded with a mapping grade sub-meter
GPS unit.
Upon approval from the NCDEQ Brownfields Program, S&ME will properly abandon the void created by the
Geoprobe® rods with hydrated bentonite clay mix. The disturbed surface material will be restored to the condition
it was prior to the subsurface probe/drilling.
3.2 Groundwater Sampling
S&ME proposes to install three temporary wells for the collection of groundwater samples, to evaluate
groundwater quality and elevations in the building footprint. S&ME will use a track-mounted Geoprobe® drill rig
with direct push technology to install the three temporary groundwater wells for the collection of groundwater
samples at the locations shown on the attached Figure 1. According to S&ME’s Geotechnical Exploration Report,
dated June 14, 2021, groundwater was encountered in several geotechnical borings at depths of 20 to 25 ft-bgs.
See the attached Table 1 for the planned depths of the groundwater samples.
During the advancement of the soil borings, soil samples will be continuously collected in five-foot long
disposable acetate-plastic sleeves that line the hollow stainless-steel sample probes. The soils from each boring
will be visually classified by S&ME personnel and field-screened with a calibrated photo-ionization detector (PID)
for the presence of volatile organic compounds (VOCs). The soil samples will be screened in approximate two-
foot increments.
After reaching termination depths in each of the soil borings, the temporary wells will be constructed by installing
a 10-foot section of one-inch diameter 0.010-inch slotted PVC well screen fitted to sufficient riser pipe to bring
each temporary well to the ground surface. Filter sand will be poured between the casing and boring annulus to a
depth of approximately one foot above the top of the screen. A one-foot bentonite seal will be placed on top of
filter pack.
S&ME will measure the depth to groundwater using water level indicator probe that emits an audible tone when
in contact with water. The water level indicator probe will be decontaminated between each depth to water
measurement. After measuring water levels in the temporary sampling points, S&ME will purge each temporary
well using a submersible peristaltic pump with new dedicated Teflon-lined tubing in each temporary well. The
tubing depth will be selected to intersect the well screen in each temporary well. Prior to collecting samples for
laboratory analysis, S&ME will measure field parameters consisting of pH, temperature, specific conductivity,
dissolved oxygen, and turbidity after each volume of groundwater is purged, or until the temporary well runs dry.
Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 9
The groundwater samples will be collected utilizing low-flow techniques when the pH remains constant within 0.1
standard unit and the specific conductance varies no more than 5%. The purge parameters will be recorded on
field collection sheets and will also be tabulated in the report.
Groundwater pumped from the temporary wells will be pumped via low-flow techniques directly into laboratory-
supplied containers, labeled, and placed into an insulated cooler for shipment, under chain-of-custody
procedures, to a North Carolina-certified laboratory for analysis. The groundwater samples will be analyzed for
VOCs by EPA Method 8260B, for semi-volatile organic compounds (SVOCs) by EPA Method 8270, and for RCRA 8
Metals by Method 6010. One blind duplicate sample will be collected and analyzed for the same parameters as
the record samples.
After the groundwater samples are collected, S&ME will properly abandon temporary wells in general accordance
with 15 NCAC Subchapter 2C Rule .0113 Abandonment of Wells, by removing the PVC casing, and filling the
borehole void with hydrated bentonite clay mix. The disturbed surface material will be restored to the condition it
was prior to the subsurface probe/drilling.
4.0 Laboratory Analysis
The soil gas samples will be submitted for analysis of VOCs, including naphthalene, by EPA Method TO-15. The
groundwater samples will be submitted for analysis of VOCs by EPA Method 8260, for semi-volatile organic
compounds (SVOCs) by EPA Method 8270, and for the RCRA 8 Metals by EPA Method 6010. Samples will be
submitted under standard chain-of-custody procedures to a North Carolina certified laboratory. Reporting
Limits/Method Detection Limits will meet applicable screening criteria (to the extent feasible). Laboratory reports
will include reporting of J-Flags to meet criteria.
5.0 Quality Assurance/Quality Control
5.1 Field and Laboratory Control Duplicates
One additional co-located, blind duplicate quality assurance/quality control (QA/QC) sample will also be collected
during soil gas and groundwater sampling. The QA/QC samples will be collected during the sampling event, at the
same time and location, under the same conditions and submitted in separated containers, with unique sample
IDs. The blind duplicate samples will be analyzed for the same constituents as the record samples, to evaluate
analytical precision, field precision and sample homogeneity.
5.2 Sampling Equipment
The direct push tooling will be decontaminated between soil gas and soil borings and before sampling using an
Alconox®/water soap mixture and water rinse. A new PVC sleeve will be inserted in the direct push rods prior to
collection of soil samples. A new, dedicated SGI will be used for each soil gas sample and new PVC casing will be
used for each temporary well. Dedicated Teflon-lined tubing will be used in collection of the soil gas samples.
Summa canisters for both the record sample, and the duplicate sample, will be individually certified and pre-
evacuated from the laboratory. Analytical documentation, demonstrating that the individually-certified summa
Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 10
canisters are free of the target compounds down to the project reporting limits, will be obtained from the
laboratory, and provided in S&ME’s report.
5.3 Sample Custody
The sampler will complete a chain-of-custody (COC) form provided by the laboratory. The sampler will sign where
indicated and record the site identification, sample number, date and time of sampling, matrix code, sample type,
bottle/preservative type, and the analyses requested. When the custody of samples is transferred, the persons
relinquishing and receiving custody will sign, date, and record the time of transfer on the COC. If the samples are
shipped using a commercial courier, the bill of lading will become part of the COC and will serve as the signature
of the person receiving the samples. Upon receipt of the samples at the laboratory, a sample custodian will
accept custody of the sample and verify that the COC is still intact. The laboratory will maintain the COC
throughout the analytical and reporting processes. For the soil gas samples, the laboratory will record the
pressure upon arrival of the summa canisters. If the initial vacuum prior to sampling is in excess of 10% lower
than the vacuum documented by the laboratory upon receipt, the cannister will not be used.
5.4 Laboratory Analytical Report
It is anticipated that routine analytical services will be provided by Pace Analytical Laboratory for this project. The
laboratory will provide Level II QA/QC analyses for this project, including the reporting of target analytes at
concentrations between the laboratory method detection limits and the laboratory reporting limits, otherwise
known as “J values”. To the extent feasible, the laboratory method detection limits will not exceed the respective
regulatory standards.
6.0 Investigative Derived Waste (IDW) Management and Disposal
Drill cuttings and liquids generated during field activities (purge water) will be containerized in a 55-gallon
drum(s), labeled, secured, and stored onsite. S&ME will collect one composited sample from the drum(s) for VOCs
and chromium and lead, using Toxicity Characteristic Leaching Procedure (TCLP) Extraction. The laboratory data
will be used to determine the appropriate disposal methodology for the contained purge water. S&ME will
coordinate the removal of the drums from the site. For purposes of this proposal, S&ME has assumed the IDW
will be disposed of as a non-hazardous waste. A copy of the disposal manifest will be included in our report.
7.0 Reporting
Following receipt of the laboratory analyses and results, S&ME will prepare and submit a letter report including
the following information:
 Introduction: Describes the site conditions as the time of the field activities.
 Deviations: S&ME will describe any deviations from this Work Plan.
 Results: S&ME will review and tabulate the laboratory analytical results and, if appropriate, will visually
map the results on a drawing(s). The drawing(s) will show the sample locations and analytical results.
 Field Data Collection sheets, including groundwater purging parameters, soil gas sampling data.
 Quality control data will also be presented and discussed with regard to data quality.
Work Plan for Groundwater and Soil Gas Sampling
Davis Drive Site
Research Triangle Park, Durham County, North Carolina
S&ME Project No. 214045
NCDEQ, Brownfields Project No.: 13025-09-032

October 18, 2021 11
 Appendices: S&ME will provide completed photographic logs, a copy of the laboratory analytical
reports, chain-of-custody records, and disposal manifests and applicable permits.
 The report will be prepared under the supervision of a North Carolina Licensed Professional Geologist
(PG), or Professional Engineer (PE), and will bear both the firm PG/PE license numbers and individual
license numbers and seals.
8.0 References
Below is a chronological list of previous assessment reports, relevant to the Davis Drive Site, which were
considered in preparing this assessment work plan.
 April 10, 1995 – Phase I Environmental Site Assessment, prepared by NEO Corporation.
 July 1, 1996 – Phase II Hazardous Substances Survey and Report, prepared by MTS Envirosurv
 September 4, 1996 – Confirmational Sampling Report, prepared by Environmental Resources
Management, Inc.
 October 2, 1996 – Hazardous Substances Survey and Report, prepared by MTS Envirosurv
 November 6, 1996 – UST Closure Report, prepared by ERM Southeast, Inc.
 May 25, 1999 – Groundwater and Surface Water Sampling, prepared by Environmental Resources
Management
 December 2001 – Groundwater Monitoring Report, prepared by Groundwater and Environmental
Services, Inc.
 May 2004 – Groundwater Monitoring Report, prepared by Groundwater and Environmental Services,
Inc.
 July 2010 - Groundwater Monitoring Report, prepared by Kimley-Horn and Associates, Inc.
 December 2, 2010 – Soil Screening Services During Building Slab Demolition, prepared by ECS
Carolinas, LLP
 January 27, 2011 – Environmental Services During Building Demolition, prepared by ECS Carolinas, LLP
 July 2011 – Soil Vapor Sampling, prepared by Kimley-Horn and Associates, Inc.
 June 11, 2021 – Stormwater Soil Evaluation Report, prepared by S&ME, Inc.
 June 14, 2021 – Geotechnical Exploration Report, prepared by S&ME, Inc.
 July 1, 2021 – Environmental Sampling Report, prepared by S&ME, Inc.

ATTACHMENTS
Subject Property
SCALE:
DATE:
PROJECT NUMBER
FIGURE NO.
11 " = 2,000 '
6-18-21
214045
SYNGENTA RTP INSECTARYDAVIS DRIVEMORRISVILLE, DURHAM COUNTY, NORTH CAROLINADrawing Path: Z:\Shared\SME\Ops\GEO\Projects\2021\214045_Hanbury Architects_Syngenta RTP Insectary_Morrisville, NC\GIS\USGS.mxd plotted by mverbanic 06-18-20210 2,000 4,000(FEET)
VICINITY MAP
³
REFERENCE:GIS BASE LAYERS WERE OBTAINED FROM THE USGS NATIONAL TOPO MAP VIEWER. THISMAP IS FOR INFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED AREAPPROXIMATED. THEY ARE NOT BASED ON CIVIL SURVEY INFORMATION, UNLESS STATEDOTHERWISE.
SCALE:
DATE:
PROJECT NUMBER
FIGURE NO.
2
NTS
7/15/2021
214045SYNGENTA GEOTECHNICAL EXPLORATIONSYNGENTA RTP INSECTARYMORRISVILLE, NORTHCAROLINA SITE PLAN WITH BORING LOCATIONSNOTE: THIS AERIAL PHOTOGRAPH FROM GOOGLE EARTH WAS MODIFIED BY S&ME.
LEGEND
Proposed Soil Gas Sample Locations
@A@A@A@A@A@A@A@A@A&B&B@A@A!(@A!(@A!H!H&B&B!H!HÐ!GÐ!G!H!(@AÐ!G&B&BÐ!G&B&BÐ!GÐ!GÐ!G&BÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!GÐ!G#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0%L%L%L%L%L%L%L%L%L%L%LDa vis Dr
I40 EI40 WLaboratory DrProposed Insectary BuildingPrevious ExcavationsSite ParcelProposed Sampling Points
%L Groundwater Sample
%L Soil Gas Sample
Historical Sampling Locations
!(@A Type III Monitor Well
@A Type II Monitor Well
&B Temporary Well
!H Piezometer
#0 Soil Gas
Ð!G Sediment
Ð!G Soil
Ð!G Surface Water
SCALE:
DATE:
PROJECT NUMBER
FIGURE NO.
3
1 " = 200 '
10-1-21
214045SYNGENTA RTP INSECTARYDAVIS DRIVEMORRISVILLE, DURHAM COUNTY, NORTH CAROLINADrawing Path: T:\GEO\Projects\2021\214045_Hanbury Architects_Syngenta RTP Insectary_Morrisville, NC\GIS\Brownfields\working map.mxd plotted by mverbanic 10-01-20210 250 500
(FEET)PREVIOUS SITE INVESTIGATIVE EXHIBIT³
REFERENCE:GIS BASE LAYERS WERE OBTAINED FROM THE 2017 NCONEMAP AERIAL ORTHOIMAGERYLAYER AND THE 2007 NCDOT LIDAR CONTOUR DATASET. THIS MAP IS FORINFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED AREAPPROXIMATED. THEY ARE NOT BASED ON CIVIL SURVEY INFORMATION, UNLESS STATEDOTHERWISE.
#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0#0SG-1
SG-3
SG-4
SG-5 SG-6
SG-7
SG-8
SG-9
SG-10 SG-11
SG-12
SG-13
SG-14
SG-15 SG-16
SG-17
SG-18
SG-19
SG-20 SG-21
SG-22
SG-23
SG-24
SG-25
SG-26
SG-27
SG-28
SG-29
SG-30
SV-1 SV-2 SV-3
SV-4 SV-5 SV-6
SV-7 SV-8 SV-9
Proposed Insectary BuildingPrevious ExcavationsSite Parcel
Historical Sampling Locations
#0 Soil Gas
SCALE:
DATE:
PROJECT NUMBER
FIGURE NO.
4
1 " = 50 '
9-30-21
214045SYNGENTA RTP INSECTARYDAVIS DRIVEMORRISVILLE, DURHAM COUNTY, NORTH CAROLINADrawing Path: T:\GEO\Projects\2021\214045_Hanbury Architects_Syngenta RTP Insectary_Morrisville, NC\GIS\Brownfields\historical sg sampling.mxd plotted by mverbanic 09-30-20210 50 100
(FEET)HISTORICAL SOIL GAS SAMPLING EXHIBIT³
REFERENCE:GIS BASE LAYERS WERE OBTAINED FROM THE 2017 NCONEMAP AERIAL ORTHOIMAGERYLAYER AND THE 2007 NCDOT LIDAR CONTOUR DATASET. THIS MAP IS FORINFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED AREAPPROXIMATED. THEY ARE NOT BASED ON CIVIL SURVEY INFORMATION, UNLESS STATEDOTHERWISE.
SSSSSSRDRDRDBFPWMUDUDTPTTTEXISTINGGREENHOUSEEXISTINGMAINTENANCEBUILDING& UTILITYYARDEXISTINGBUILDINGEXISTINGSTORMWATERWET POND317.96'TW 332.56'BW 317.96'TW 332.94'BW 317.96'317.05'CENTERLINE OF PROPOSED SWALE316.07'PROPOSED DOMESTICWATER METERPROPOSED DOMESTICBACKFLOW PREVENTERPROPOSEDSANITARY SEWERMANHOLE, TYP.PROPOSED PVC ROOF DRAINPROPOSED LANDSCAPE INLETPROPOSED PVC ROOF DRAIN CLEANOUTPROPOSED UNDERDRAIN3333343353
1
7
3
1
8
336
337TC:335.15BC:334.65334.55334.50TC:335.08BC:334.58TC:335.13BC:334.63TC:335.04BC:334.54TC:335.12BC:334.62PROPOSEDTREE PROTECTIONFENCE, TYP.PROPOSEDLIMITS OFDISTURBANCE, TYP.317.25317.00316.77317.25318.25317.50317.16332
330
325
320
332332
Elevations TableNumber123456Minimum Elevation-20.00-16.00-12.00-8.00-4.000.00Maximum Elevation-16.00-12.00-8.00-4.000.004.00ColorD200200TC 44.50BC 44.00TW 46.00BW 44.0044.50GRADING LEGEND:DESCRIPTIONSYMBOLPROPOSED MAJOR CONTOURPROPOSED MINOR CONTOUREXISTING MAJOR CONTOUREXISTING MINOR CONTOURPROPOSED STORM DRAINAGEPROPOSED CATCH BASINPROPOSED JUNCTION BOXPROPOSED AREA DRAINPROPOSED ELEVATIONTOP/BOTTOM OF CURBTOP/BOTTOM OF WALLRIPRAP DISSIPATORFLOW DIRECTIONLIMITS OF DISTURBANCENOTES:1.SEE SHEET C0.10 FOR GENERAL AND GRADING NOTES.NORTH02040801"= 40'SCALE:DRAWN BY:CHECKED BY:PROJECT NO:DESCRIPTIONDATEMARKSHEET TITLE:SHEET NUMBER:342516214356CABDECABDECONSULTANT
21042.00KEYPLANDATE:06/11/2021RTP Insectary Expansion
Durham, North CarolinaSyngentaDESIGN DEVELOPMENT SUBMITTALCOPYRIGHT © 2021 HANBURY EVANS WRIGHT VLATTAS + COMPANYNOT FORCONSTRUCTIONCUT - FILLANALYSISCF-100AHAH
SG-1 335 317 18 20 20
SG-2 335 317 18 20 20
SG-3 334 317 17 20 20
SG-4 335 317 18 20 20
SG-5 330 317 13 15 15
SG-6 325 317 8 10 10
SG-7 330 317 13 15 15
SG-8 320 317 3 5 4
GW-1 335 317 18 20 20
GW-2 333 317 16 18 18
GW-3 320 317 3 10 10
Notes:
ft. AMSL: Feet Above Mean Sea Level
ft. BGS: Feet Below Ground Surface
VOCs: Volatile Organic Compounds
SVOCs: Semi-Volatile Organic Compounds
RCRA: Resource Conservation and Recovery Act
See Figure 2 for Proposed Sample Locations
See Figure 5 for Site Grading Plan
Eight plus
one blind
duplicate
(total is 9)
TABLE 1
Summary of Sample Point Information
Syngenta Insectary - Research Triangle Park, North Carolina
Brownfields Project Name: 9 Davis Drive
Brownfields Project No. 13025-09-032
S&ME Project No. 214045
Proposed
Excavation
Depth
(ft. BGS)
three plus
one blind
duplicate
(total is 4)
Sample ID
Groundwater
VOCs/8260
SVOCS/625
RCRA 8 Metals
Determine groundwater quality and
flow direction in proposed structure
footprint.
Current Surface
Elevation
(Ft. AMSL)
Proposed
Final Floor
Elevation (Ft.
AMSL)
Soil Gas TO-15 +
Naphthalene
Determine need for vapor mitigation
system for proposed structure
footprint.
Boring
Depth
(ft. BGS)
Sample
Depth
(ft. BGS)
No. of
Samples
Proposed
Analyses PurposeSample Media
Sample ID
Date
Collected
Sample
Depth
(ft-BGS)acetonebenzenecarbon disulfidechloromethanecis-1,2-dichloroethenecyclohexane1,1-dichloroethenedichlorofluoromethaneethanolethylbenzeneheptanemethyl ethyl ketonemethyl methacrylatemethylene chloriden-hexane2-propanolpropenetoluenetrans-1,2-dichloroethenetrichloroethylene2,2,4-trimethylpentane1,1,2-trichlorotrifluoroethanevinyl chlorideSG-1 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-2 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-3 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-4 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-5 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-6 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-7 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-8 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-9 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-10 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-11 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-12 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-13 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-14 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-15 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-16 11/5/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-17 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-18 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-19 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-20 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-21 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-22 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-23 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-24 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-25 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-26 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-27 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-28 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-29 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SG-30 11/6/1996 3.0 BDL BDL NA NA BDL NA BDL NA NA BDL NA BDL NA NA NA NA NA BDL NA BDL NA NA BDL
SV-1 7/5/2011 5.0 230 180 BDL BDL 2,200 52 3,500 BDL 26 320 82 77 BDL BDL 110 BDL 1,200 280 230 31 BDL BDL 1,400
SV-2 6/30/2011 5.0 950 210 50 BDL 480 100 BDL BDL 110 300 78 BDL BDL BDL 120 BDL 1,900 100 33 BDL BDL BDL 89
SV-3 7/5/2011 5.0 290 3.2 BDL 1.8 33.0 BDL 48 2.70 66 7.8 BDL BDL 27 1.4 3.1 6.9 29 11 3 BDL BDL BDL 19
SV-4 7/5/2011 5.0 BDL 160 BDL BDL 300 BDL 280 BDL BDL 48 BDL BDL BDL BDL BDL BDL BDL 68 BDL BDL BDL BDL 280
SV-5 7/5/2011 5.0 3,800 BDL 40 BDL BDL 30 BDL BDL 530 BDL 86 BDL 680 49 85 BDL 1200 BDL BDL BDL BDL BDL BDL
SV-6 7/5/2011 5.0 BDL BDL BDL 1.7 1.8 1.5 BDL 2.6 120 BDL BDL 22 BDL 6.3 3.9 18 110 7.2 BDL 9.1 3.2 6.3 BDL
SV-7 7/1/2011 5.0 570 240 47.0 34.0 BDL BDL BDL BDL 87.0 BDL BDL BDL BDL BDL 29 BDL 590 600 BDL BDL BDL BDL BDL
SV-8 7/1/2011 5.0 520 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 260 BDL BDL BDL BDL BDL
SV-9 7/1/2011 5.0 5,000 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL
280,000 160 6,200 780 NE NE 1,760 1,760 NE 490 NE 4,400 6,200 2,600 6,200 NE NE 44,000 520 610 NE NE 280
NOTES:
See Figure 4 for sample locations.Soil Gas Screening Levels from Sol Gas Sampling by GMA, dated August 2, 2011
Concentrations exceeding the laboratory's reporting limits are shown in BOLD fields.
ft-BGS - feet below ground surface Concentrations exceeding the 2011 Soil Gas Screening Levels are shown in Shaded and BOLD fields.
Soil Gas Samples SG-1 through SG-30 from Comprehensive Site Assessment Report by ERM, Inc., dated April 16, 1997.NA: Parameter not included in analysis.
Soil Gas Samples SV-1 through SV-9 from Soil Gas Sampling by GMA, dated August 2, 2011.BDL: Not detected in concentrations exceeding laboratory detection limits
Soil Gas Samples SG-1 through SG-30 were analyzed by a field gas chromatograph NE: Regulatory standard not established for analyte
Soil Gas Samples SV-1 through SV-9 were analyzed by EPA Method TO-15
Concentrations shown are in micrograms per cubic meter (µg/m3)
Analytical Methods Soil Gas Samples SG-1 through SG-30 analyzed by Field Gas Chromatograph | Soil Gas Samples SV-1 through SV-9 analyzed by EPA Method TO-15
Soil Gas Screening Levels
Syngenta Insectary - Research Triangle Park, North Carolina
Brownfields Project Name: 9 Davis Drive
Brownfields Project No. 13025-09-032
S&ME Project No. 214045
TABLE 2
SUMMARY OF HISTORICAL SOIL GAS ANALYTICAL RESULTS