25058_6500 Chapel Hill_Final_Grade_Sampling_WP_FINAL_20230907

FINAL GRADE ASSESSMENT WORK PLAN
6500 CHAPEL HILL ROAD
RALEIGH, NORTH CAROLINA
BROWNFIELDS PROJECT NO.:25058-21-092
MID -ATLANTIC PE LICENSE: F-0967
REVISION NO.: 0
MID -ATLANTIC JOB NO. R3818.01
Certification
Kevin R. Clay, PG
Project Geologist
September 7, 2023
Prospective Developer:
Greystar Development East, LLC
C/O Zach Spencer
555 Fayetteville Street
Raleigh, North Carolina 27601
Phone: [phone]
Email: zach.spencer(a)greystar.com
Consultant:
Mid -Atlantic Associates, Inc.
Daniel H. Nielsen, PE
409 Rogers View Court
Raleigh, North Carolina, 27610
Phone: [phone]
Email: dnielsen(a)maaonline.com
Brownfields Project Manager:
Holly Samaha, PE
North Carolina Department of Environmental Quality
Mail Service Center 1646
Raleigh, North Carolina 27699
Phone: [phone]
Email: holly.samaha(a)ncdenr.gov
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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 Brownfields Property is a 8.13-acre parcel located in Raleigh, North Carolina (Drawing 1).
This Work Plan has been developed and formatted in accordance with the Minimum
Requirements Checklist for Site Assessments Work Plans and Reports, February 2022
developed by the North Carolina Department of Environmental Quality (DEQ) Brownfields
Program (Appendix A).
The Brownfields Property was wooded and agricultural until the late 1950s when a residential
structure was built on the south-central portion of the site with what appeared to be a large barn in
the northern portion of the site. Soil stockpiling is visible at the site in 1981 and 2008 aerial
photographs and was reportedly in connection with the construction of Interstate 40. The site is
currently undergoing redevelopment. The planned redevelopment of the Brownfields Property
consists of multi -family residential (apartments) in eight buildings, a clubhouse building, and
outdoor recreational areas. Outdoor parking will occupy the interior of the Brownfields Property and
will be adjacent to the planned apartment buildings.
Soil sampling and analysis documented in Mid -Atlantic's Limited Environmental Site
Assessment Report (LSA) did not identify evidence of a release of petroleum and/or hazardous
substances to the environment at the Brownfields Property. Imported fill materials have
originated from the NCBRS pre -approved Wake Stone facility in Knightdale, NC. The imported
materials have only consisted of aggregate base course (ABC) and #57 stone.
In a July 20, 2023 conference call, the NC Brownfields Redevelopment Section (NCBRS)
requested that Mid -Atlantic perform final grade sampling. The redevelopment of the Brownfields
Property consists of an apartment complex with associated parking, recreational, and
landscaped areas. Approximately 36,200 ft2 of area where exposure to surface soils could occur
within the area where construction activities are taking place (note: this total includes areas
where trees, shrubs, and mulch will be applied and does not include areas beyond the boundary
of the Brownfields Property). Landscaped areas are planned around the northern and western
perimeter of the redevelopment, surrounding apartment buildings, within the parking lot, and
along the public right-of-way. A central courtyard area surrounded by a group of three apartment
buildings and clubhouse will be mostly paved with the exception of landscaping adjacent to
apartment buildings, an approximately 1,000 ft2 grassy area adjacent to the clubhouse and an
approximately 650 ft2 yoga lawn. In addition, the northern approximately 34,500 ft2 of the
property will remain as an undisturbed wooded area.
EXPERIENCED CUSTOMER FOCUSED INNOVATIVE

Final Grade Sampling Assessment Work Plan September 7, 2023
6500 Chapel Hill Road Page 2
Raleigh, North Carolina
SECTION 2 SCOPE OF WORK
The assessment includes the collection of three composite soil samples from final grade near -
surface soil along small vegetated/mulch areas adjacent to apartment buildings, parking lots,
and/or paved traffic areas. Most sample aliquot locations are located adjacent to parking areas
where nearby pedestrian traffic is most likely. A grab sample will be collected from the yoga lawn
south of the clubhouse based on its proposed recreational usage. These samples together will
characterize approximately 21,550 ft2 of soil at vegetated/mulch areas adjacent to paved traffic
areas. One composite sample will also be collected from the undisturbed wooded area in the
northern portion of the site. Soil sample locations are illustrated in Drawing 2 and summarized
(including sample depths and analytical tests) in Table 1.
SECTION 3 SAMPLING METHODOLOGY
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 Minimum Requirements Checklist for Site Assessment Work Plans
and Reports (February 2022)
• Inactive Hazardous Sites Program Guidelines for Assessment and Cleanup of
Contaminated Sites (July 2021)
Soils collected for the final grade assessment will be collected at locations illustrated in Figure 2. A
total of 21 soil borings will be advanced. Soil samples will be collected using a decontaminated
steel hand auger. Soil samples will be collected from the hand auger bucket near surface (0 to 6
inches below land surface (bls)). Grab soil samples will be collected at depths shown in Table 1
unless field observations and screening (e.g., readings from an organic vapor analyzer) indicate an
alternative sampling depth should be used.
One equal sized aliquot will be collected at each boring. The composite sample will be created by
mixing the aliquots in the field in a dedicated and new Ziploc bag prior to placing in the laboratory
supplied sample jars. One aliquot location will be selected for analysis of VOCs based on field
observations and screening of the samples from each the 0 to 6-inch interval. All selected soil
samples will be placed in a laboratory -supplied cooler which will contain ice as a preservative. Soil
sample analysis will be conducted as described in Section 4.
SECTION 4 LABORATORY ANALYSIS
Soil samples will be submitted to Waypoint Analytical Laboratory of Charlotte, North Carolina (NC
Certification Number 402). Composite samples will be analyzed for semi -volatile organic
compounds (SVOCs) by EPA Method 8270E and RCRA 8 metals by 6020B and 7471 B as shown
in Table 1. Soil grab samples will be tested for volatile organic compounds (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
Mid Atlantic

Final Grade Sampling Assessment Work Plan
6500 Chapel Hill Road
Raleigh, North Carolina
September 7, 2023
Page 3
Level II QA/QC will be provided. There will not be limitations on which soil constituents are
reported by the laboratory.
SECTION 5 QA/QC
One duplicate soil sample will be collected and will be analyzed by EPA Methods 8270E and
602013/7471 B (composite sample) and 8260D (grab sample) as shown on Table 1. Filled sample
jars will be placed in ice -filled coolers. Care will be taken to ensure that sample locations exhibiting
evidence of impacts will be used to collect duplicates, if applicable. Mid -Atlantic will fill the soil
sample jars so that the laboratory will have sufficient sample volume for matrix spike (MS)/matrix
spike duplicate (MSD) analysis. 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 collected by a laboratory -provided courier and delivered to the laboratory.
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. Prior assessment conducted at the
Brownfields Property site has not identified evidence of soils meeting hazardous waste criterion.
Therefore, soil displaced for the soil borings will be placed back into the boring from which the
soils were generated. Excess soil will be spread at land surface at the boring site. If visual or
olfactory evidence indicates significant impacts, the IDW will be contained in 55-gallon drums
pending analytical results.
SECTION 7 REPORTING
Following completion of assessment field activities and receipt of laboratory analytical data, Mid -
Atlantic will prepare a Final Grade Assessment Report to document field activities and provide
analysis of the data collected. Soil analytical data will be compared to Preliminary Soil Remedial
Goals (PSRGs). As appropriate, the analytical data will be evaluated using the NCDEQ risk
calculator for cumulative risk evaluation(s). The report will include:
• Reporting/summary of site work conducted as outlined above;
• Summary of findings and possible recommendations;
• All applicable tables including tabulated sample depths, analytical data, with comparison to
the PSRGs, cumulative risk evaluations;
• All applicable figures which will depict actual sample locations (with scale and north arrow);
• Boring logs;
• Mid -Atlantic's PE/PG License Number; and
• The Professional Engineer's or Licensed Geologist's individual PE/LG seal and signature.
Mid Atlantic

TABLE
0 Mid Atlantic

TABLE 1
Final Grade Sampling Summary
6500 Chapel Hill Road
Raleigh, North Carolina
Area
Approximate Area of
Exposed Soil Post
Redvelo ment ft2
Boring
Count per
Area
Boring
Name
Boring
Depth* (ft)
Soil Sample
ID
Default Sample
Depth* (ft)
VOCs
SVOCs
RCRA
Metals
A
34,500
5
Al
0.5
A
0.5
G
C
C
A2
A3
A4
A5
B
7,500
5
131
0.5
B
0.5
G
C
C
B2
B3
B4
B5
C
4,900
5
C1
0.5
C
0.5
G
C
C
C2
C3
C4
C5
D
8,500
5
D1
0.5
D
0.5
G
C
C
D2
D3
D4
D5
Yoga Lawn
650
1
YL
0.5
YL
0.5
G
G
G
Duplicate
Sample'
1
1
1
Totals
56,050
21
6
6
6
Objective: The objective for all samples is the same; to assess soil quality in final grade near -surface soils.
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 field evidence does not suggest an alternative sample depth.

FIGURES
0 Mid Atlantic

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1. RALEIGH WEST, NC DIGITAL RASTER GRAPHICS,
USGS. SCANNED FROM 1:24,000-SCALE WAKE, NC
TOPOGRAPHIC MAPS, PUBLISHED 2019, USGS.
2. INSET MAP DIGITAL DATA FROM 2002 NATIONAL TRANSPORTATION ATLAS,
BUREAU OF TRANSPORTATION STATISTICS, WASHINGTON, D.C.
3. PROPERTY BOUNDARY DATA FROM WAKE COUNTY GIS.
TOPOGRAPHIC SITE MAP
Mid Atlantic 1100 CHAPEL HILL ROAD
Engineering & Environmental Solutions RALEIGH, NORTH CAROLINA
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REFERENCES:
1. MID -ATLANTIC FIELD NOTES.
2. NCONE MAP LATEST ORTHOIMAGERY
3. LANDSCAPE PLAN BY THE JOHN R. MCADAMS COMPANY, INC.
Mid Atlantic
Engineering & Environmental Solutions
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Legend
Proposed Grab Sample Location
0 Proposed Soil Aliquot Location
Soil Exposure Unit
Subject Property
SCALE:1 inch equals 60 feet
Feet
0 100 200
DRAWN DATE:
BY: KRC AUGUST 2023
PROPOSED SAMPLE LOCATION MAP DRAFT DHN JOB NO:
6500 CHAPEL HILL ROAD CHECK: 00OR3818.01
RALEIGH, NORTH CAROLINA ENG. GIS NO:
CHECK: DHN 3G-R3818.01-2
APPROVAL:DHN DWG NO: 2

ATTACHMENT A
MINIMUM REQUIREMENTS CHECKLIST FOR SITE
ASSESSMENT WORK PLANS AND REPORTS
Mid Atlantic

Work Plan and Report Checklist
Version 2 February 2022
Minimum Requirements Checklist
for
Site Assessment
Work Plans and Reports
NCDEQ Brownfields Program — February 2022
Instructional Page
All references to Prospective Developers includes follow-on owners who may be conducting
work in accordance with the Brownfields Property Management Unit.
To increase predictability and most efficiently assess Brownfields Properties and the redevelopment
timing requirements of Prospective Developers or follow-on owners, the Brownfields Program has
standardized the format for Site Assessments. This format has been generated in the form of a
checklist to allow for ease in submission by the prospective developer's consultant and for the
Brownfields Program's completeness review. This checklist outlines the minimum requirements and
submittal format under the Brownfields Program for Assessment Requirements and Reporting. All
Assessment Work Plans and Reporting submissions to the Brownfields Program must include this
completed checklist in the outlined format.
These requirements allow DEQ to reduce review time for the Assessment Work Plan and Report
and increase process predictability for prospective developers. This checklist will also provide
reliable data for risk -based decisions and further expedite the project timeline. Any divergence from
these requirements will lengthen the process of assessing risks on the site, may necessitate
reprioritization of a project manager's queue towards projects that meet these requirements.
Therefore, delaying production of the brownfields agreement and/or environmental management
plan. Any alterations to the checklist on a site- specific basis must be reviewed and approved by the
Program prior to implementation. However, in order to respect the schedule of all projects in house
and keep the program's entire project pipeline moving, we strongly recommend against seeking
changes to the checklist.
Based on a review of environmental and risk data from our project inventory, please note
there are some new points of emphasis that are included herein:
1. For ALL residential reuses; sub -slab vapor assessment (full list EPA TO-15) is required,
regardless if existing structures will be removed. If no structures or slabs exist on the
Brownfields Property, exterior soil gas assessment is required within all proposed structure
footprints.
2. ALL properties require groundwater data (VOCs, SVOCs and RCRA Metals) from a
minimum of three sample locations, depth to groundwater and a resulting potentiometric
map.
3. Soil shall be assessed based on areas of concern and redevelopment plans and across the
depth interval of the cut/grading.

Work Plan and Report Checklist
Version 2 February 2022
Environmental Site Assessment
Work Plan Checklist
Reviewed and checked by (Name): Kevin Clay
Title Page
The title page should include the following information. Letter style reports are acceptable, as long as this
information is somewhere on the first page.
X Title of Work Plan
X Brownfields Project Name (not the development name)
X Brownfields Project Number
X Date (updated with each revision)
X Revision Number
X Firm PE/PG License Number
X Individual PE/PG seal & signature
X Contact information for Developer, Consultant, and Project Manager
Section 1— Introduction
X Provide the site location, address, and acreage.
X Provide a BRIEF summary of the history of the property and its history in the program. For example:
reiterate RECs from a Phase I ESA, indicate if the scope of work was negotiated during a Data Gap
Meeting, etc.
X Briefly list and describe the data gaps the assessment is attempting to fill
X Indicate if the assessment data is for the use of any other DEQ programs in addition to the
Brownfields Program (i.e. the site is a regulated UST, IHSB, etc. property)
Section 2 — Scope of Work
X Provide a general description of proposed scope of work covered in this plan (i.e. 2 new monitoring
wells, six groundwater samples, 5 exterior soil gas sampling points and 6 soil borings)
X Discuss samples to be collected by media and source area/location. Generally, the reasoning for the
sample locations selected.
X Describe depths of samples to be collected (Reference Table 1) or how that decision will be made
in the field, if needed.
X State for what each sample will be analyzed (briefly). Reference Table 1 (See Table 1 and Section 4)
For all residential reuses, sub slab vapor is required, if no slabs exist, exterior soil gas is
required within all proposed footprints. (Final grade assessment — no soil gas testing proposed)
Section 3 — Sampling Methodology
X Reference the guidance documents you intend to use. IHSB, EPA SESD, VI Guidance, Well
Construction Rules (NCAC 2C). Note deviations or methodology planned that is not covered by
such guidance (e.g., multi -increment sampling, passive air samplers, mobile labs, Hapsite,
simultaneous indoor/outdoor radon, high -volume subslab vapor testing, PFAS sampling).
X Describe what will be installed (soil boring, temporary well, permanent well, sub slab vapor, exterior
soil gas, etc.). Include construction details.
X Discuss installation methodology (Hand Auger, DPT, etc.)
X Discuss sample collection procedures. Include the following, at a minimum:
• Equipment to be used
• Purging methods and volumes

Work Plan and Report Checklist
Version 2 February 2022
• Stabilization parameters for groundwater sampling
• Field screening methods
• Leak check procedures for sub -slab vapor and exterior soil gas samples (Note this is
required)
• Discuss how and when vacuum readings will be collected (for summa cans)
Discuss sample point abandonment (Not applicable)
Section 4 — Laboratory Analyses
X Discuss the proposed analyses (include method number, preparation method, if there are concerns
with short hold times, etc).
Discuss any proposed limitations on the contaminants of concern, if any, and the reason for such
limitation (sufficient previous data, indoor air interferences, etc) (Not applicable)
X Discuss laboratory certifications. Please note, NC does not certify labs for air samples. Please
specify what certification the proposed air lab holds.
X Indicate that the Reporting Limits/Method Detection Limits will meet applicable screening criteria
(to the extent feasible). Include Reporting of J-Flags to meet criteria.
X Indicate what Level QA/QC will be reported by the laboratory. Level II QA/QC is typically
acceptable.
Section 5 — QA/QC
X Specify the duplicate sample frequency. Minimum requirement: 1 duplicate per 20 samples, per
media, per method.
X Discuss Trip Blank. 1 Trip Blank per cooler/shipment of groundwater VOC analyses is required.
X Discuss how the lab will have sufficient sample volume for MS/MSD analyses.
X Discuss chain of custody and shipping.
Section 6 — Investigation Derived Waste (IDW) Management
X 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, then 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 above sample collection. At a minimum, the report shall include:
X Reporting/summary of site work conducted for all sections outlined above in this checklist;
X Summary of findings and possible recommendations;
X All applicable tables and figures outlined below with the addition o£
X Tables for tabulated analytical data per media sampled and analyzed, compared against
applicable screening levels, sample depths and depth to groundwater;
X Figure depicting actual sample locations collected, with each media depicted in the
legend, graphic scale and north arrow; and
X Groundwater potentiometric map, with graphic scale and north arrow.
- Boring logs for all soil borings, newly constructed monitoring wells, and exterior soil gas locations
- Well construction and abandonment records, if applicable

Work Plan and Report Checklist
Version 2 February 2022
X Firm PE/PG License Number
X Individual PE/PG seal & signature

Work Plan and Report Checklist
Version 2 February 2022
Attachments
X Table 1 — Proposed Sample Locations and Analyses on a Summary Table that includes:
Sample ID
Sample Objective
Proposed Depth(s)
Analytical Method(s)
QA/QC Samples
Background Samples
X Figure 1 — Site Location Map
Site location on a topographic map base
Graphic scale and north arrow
X Figure 2 — Site Map should include the following
Buildings
Historical sample locations
RECs or other areas of concern
Proposed sample locations
Sample identification labels
Background samples
QA/QC samples
Graphic scale and north arrow
High quality aerial suggested as the base map
Figure 3 — Site Potentiometric Map
- Buildings
-Groundwater sample identification labels
-Graphic scale and north arrow
Figure 4 — Site Plume Maps (groundwater, soil vapor, etc.)
Figure 5 — Proposed Development (if available)
Overlay of historical and proposed sample locations
Graphic scale and north arrow
Appendix — Summary of Historical Analytical Data (if needed) — to include tables and figures only.