25075_Lake Wheeler Assemblage_Assessment WP_Phase I_20220509

SECTION 1 INTRODUCTION

The subject site totals 7.52 acres and is comprised of 16 parcels located at 1217, 1215,
1213, 1209, 1205, 1201, 1123 Lake Wheeler Road, 1008, 1009 Hammell Drive, 1048,
1044, 1040, 1036, 1030, 1018 and 1022 S. Saunders Street in Raleigh, North Carolina
(Figure 1). The redevelopment is being conducted in two phases. Phase I Redevelopment
is located south of the intersection of Lake Wheeler Road and Hammell Drive and includes
seven parcels (1217, 1215, 1213, 1209, 1205, 1201 Lake Wheeler Road and 1008
Hammell Drive). Phase I Redevelopment plans are complete enough to conduct the data
gap assessment described herein. A separate data gap assessment work plan will be
developed for Phase II Redevelopment (east of the intersection of Lake Wheeler Road
and Hammell Drive) when those redevelopment plans are developed beyond their current
conceptual stage.

This Data Gap Assessment Work Plan is associated with the seven parcels (3.63 acres)
which comprise Phase I Redevelopment. Although the assessment activities 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 September 13, 2021. DEQ
issued a Letter of Eligibility on November 10, 2021. The DEQ Underground Storage Tank
(UST) Section regulated two USTs formerly located at 1008 Hammell Drive. These USTs
were installed in 1964 (2,000 gallon gasoline) and 1970 (12,000 gallon diesel) and
removed in 1995. Samples collected during the closure of these USTs did not indicate the
presence of a release. 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 a mix of commercial and residential development.
Historic use of the Phase I Redevelopment parcels is summarized as follows:

1217 Lake Wheeler Road: Historic and current use is single family residential.
1215 Lake Wheeler Road: Historic and current use is single family residential.
1213 Lake Wheeler Road: Historic and current use is single family residential.
1209 Lake Wheeler Road: Historic and current use is single family residential.
1205 Lake Wheeler Road: Historic and current use is single family residential.
1201 Lake Wheeler Road: Historic and current use is single family residential.
1008 Hammell Drive: Historically used for trucking and most recently for
warehousing.

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1.3 Vapor Intrusion Potential

With the exception of the former UST locations at 1008 Hammell Drive, prior
environmental assessments involving analytical testing have not been conducted at the
site. At the former UST location soils did not exhibit Total Petroleum Hydrocarbons at
concentrations exceeding UST Section Action Levels. However, the former presence of
the USTs is a potential vapor intrusion source. In addition, the residential structures
present on the site date to a time when fuel oil was commonly used for heating. These
homes currently use natural gas for heating, but it is possible that they used fuel oil in the
past. Although site inspections did not reveal evidence of above or below ground evidence
of fuel oil storage, the possible historic use of fuel oil at these residences has the potential
to cause vapor intrusion. Specific use of trichloroethylene at or adjacent to the site has not
been identified.

1.4 Recognized Environmental Condition (REC)

A Phase I Environmental Site Assessment was conducted in 2021 by Mid-Atlantic
Associates, Inc. for the entire assemblage. The following REC was identified on the
Phase I Redevelopment portion of the assemblage:
 The historical use of petroleum USTs and the potential for use of other
hazardous chemicals in support of trucking services at 1008 Hammell Drive.

The locations of the historical uses that are environmental concerns are shown on
Figure 3a.

1.5 Conceptual Site Model

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 the
former UST locations. Soil assessment to be conducted in cut areas is included to address
worker exposure concerns and to establish soil reuse options. Soil gas assessment
activities include assessment at a former UST location and at former residences that may
have historically used fuel oil and are located where new structures are proposed. These
data are intended to determine if historical use has caused vapor intrusion conditions and
if vapor mitigation is warranted.

1.6 Assessment Scope Discussions with Brownfield Program

During a meeting on April 11, 2022 with the Brownfield Program and the Environmental
Consultant, the general scope of the data gap assessment was discussed. It was
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recognized that the potential environmental areas of concern (AOC) were associated with
the former USTs and trucking operations. The possibility of historic fuel oil use at the
residential properties along Lake Wheeler Road was also identified by the Brownfield
Program as a concern. During the meeting and follow up discussions via telephone, it was
recognized that the primary assessment objective is to determine if the former on-site
USTs and the possibility of residential heating oil releases have caused vapor intrusion
conditions at the brownfield property. Thus, this Data Gap Assessment Work Plan is
biased toward soil gas assessment associated with the AOCs and targeting areas where
future buildings are planned. In addition to these areas of concern, soils that will be cut are
also included in this assessment. Since the site is a net export (approximately 30,000
cubic yards) the assessment will be used to determine disposal options for these cut soils.

1.7 Proposed Use

The redevelopment is mixed use retail and multifamily residential (apartments) in two
buildings. Each building includes a parking structure with a combined total of
approximately 1,000 parking places. Both Building A and Building B are 20 stories tall. In
total, there will be approximately 18,000 square feet of retail space and 670 residential
apartments.

1.8 Demolition, New Construction and Foundations

All existing structures will be razed and replaced with the new structures. The new
structures will use pier and spread footing for foundations. Both podium and slab-on-grade
construction will be used. Parking, commercial/retail and residential portions of the new
buildings will be 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 five elevators in proposed Building A. There are three
elevators and one stairwell included in the redevelopment plans for Building B. Each of
these originate on the ground floor and enter the occupied portions of the buildings.

1.11 New Structure Locations and Known Contamination

There is no known contamination on the Phase I Redevelopment portion of the site. The
former UST locations are adjacent to proposed retail portion of Building A.

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1.12 Proposed and Existing Building Size

In total, the existing buildings area is approximately 28,000 square feet including two
commercial structures and six residential structures. The proposed new buildings’ ground
floor area totals approximately 95,000 square feet including the proposed parking
structure.

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

The assessment is intended to evaluate the potential for AOCs to have an adverse impact
on the subject site with a bias toward evaluating the potential for vapor intrusion. 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 one soil, groundwater
and soil gas sample to address historical UST use, 19 soil samples for cut areas, two sub-
slab soil gas samples and 13 exterior soil gas samples.

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2.2 Sample Justification

Soil

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 sample S-1 will be collected
from the boring located near the former USTs. This data will be used to determine if
historical use has adversely impacted soil.

Block soil samples Blk-A(s) thru Blk-O 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.

Groundwater

One groundwater sample (GW-1) will be collected from a temporary well located near the
former USTs. This data will be used to determine if the historical use of USTs has had an
adverse impact on groundwater quality.

Sub-Slab Soil Gas

Although all current buildings will be razed, the Brownfield Program suggested collecting
sub-slab soil gas samples from the building at 1008 Hammell Road to evaluate potential
vapor encroachment conditions at the future elevator, stairwell and retail locations at the
subject site. Samples SSSG-1 and SSSG-2 (Figure 3a) will be analyzed in accordance
with Table 2a. These data will assist in evaluating whether vapor encroachment conditions
exist at the site.

Exterior Soil Gas

A total of 13 exterior soil gas samples will be collected (Figure 3a). One sample is located
at the former UST site on 1008 Hammell Drive (ESG-1). Six exterior soil gas samples will
be collected at proposed elevators, stairwells, residential and retail locations (ESG-2, 3, 4,
11, 12 and 13). The remaining exterior soil gas samples are to be collected at each of the
six residential structures along Lake Wheeler Road (ESG-5 thru ESG-10). These sample
locations are coincident with buildings of the proposed redevelopment. These samples will
be analyzed in accordance with Table 2a and the data will assist in evaluating whether
vapor 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 auger bucket or 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 15 Blocks (Block A thru
Block O) illustrated in Figure 3b. Within each block there are three to five soil borings.
Equal sized aliquots will be removed from the acetate sleeve at each boring within each
area. For Block A and E, the cuts are from 9 to 16 feet deep. Therefore, in Block A and E,
two composite samples will be created. One sample will be collected at the shallow depth
(Blk A/E(s)) and one collected at the greater depth (Blk A/E(d)). Block D has a 25-foot-
deep cut. Consequentially, three layered samples will be collected (shallow Blk D(s),
medium Blk D(m) and deep Blk D(d)). The remaining blocks will not be layered because
the cuts are comparatively shallow. Thus, these blocks have only one test interval (depth).
Each shallow, medium and/or 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 Block (A thru O), one aliquot will be
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selected for analysis of VOCs based on field observations and screening of the samples
from each boring and depth interval within a given Block. Soil sample analysis will be
conducted as described in Section 4.

3.3 Groundwater Sampling

The boring for the temporary well will be advanced using an approximately 7-inch diameter
hollow stem auger-equipped Geoprobe rig. However, weathered rock may be encountered
at shallow depths. Weathered rock can preclude 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). 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 be 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.
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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.

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 in 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 supplied 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™”, 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 ¼-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.
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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 mL/min). 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-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 five feet in fill areas
and below the proposed depth of cuts in the cut areas (Table 2a), using a direct-push drill
rig. Boring logs will be developed as described in Section 3.2. New and dedicated ¼-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 (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 mL/min). After purging, the exterior soil gas 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)
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vacuum is recorded and each exterior soil gas sample is collected until the laboratory-
provided vacuum gauge on the Summa cannister/flow regulator reaches 5 inches mercury
(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 soil or 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 8 metals by 6020B and 7471B 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 7471B 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.

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Soil gas samples will be submitted under proper chain-of-custody to Pace Analytical
Laboratory (Pace) 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 will be collected in the field and will be analyzed by EPA
Methods 8270E and 6020B/7471B (composited 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 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.
Soil gas samples will be shipped to the Pace laboratory in East Longmeadow,
Massachusetts using the laboratory-provided courier service.

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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 and installation of the
monitoring well and exterior soil gas points, as well as small quantities of concrete dust
from the installation of interior sub-slab vapor sampling probes. 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 until test results from the soil
and groundwater testing is 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). Groundwater data will be compared to North
Carolina Groundwater Quality Standards (NCGQS). 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). The report will include:
 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 PSRGs, NCGQS, SGSLs, cumulative risk evaluations
and figures depicting actual sample locations (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.

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.
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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 map(s) that include, as appropriate, high quality aerial photograph with
planned building layout, north arrow, graphic scale, historical sample locations,
areas of environmental concern, soil cut locations, proposed soil and soil gas
sample locations, and sample identification labels.

Appendix A - Tabular Summary of Historical Data
Historical data from former UST location.
Appendix B – Completed Vapor Intrusion Assessment Work Plan & Report Checklist, July
2021
Contains the completed checklist

TABLES
Brownfield
Project
Numbe
Parcel ID Address Acreage Former/Current Use RECs Proposed Use
1703343287 1217 Lake Wheeler Road 0.18
First development as
residential in the 1940s-50s.
Currently unoccupied
residential.
Possible historic heating oil
use
1703344394 1215 Lake Wheeler Road 0.93
First development as
residential in the 1940s-50s.
Currently unoccupied
residential.
Possible historic heating oil
use
1703345483 1213 Lake Wheeler Road 0.18
First development as
residential in the 1940s-50s.
Currently unoccupied
residential.
Possible historic heating oil
use
1703346427 1209 Lake Wheeler Road 0.19
First development as
residential in the 1940s-50s.
Currently unoccupied
residential.
Possible historic heating oil
use
1703347551 1205 Lake Wheeler Road 0.17
First development as
residential in the 1940s-50s.
Currently unoccupied
residential.
Possible historic heating oil
use
1703346585 1201 Lake Wheeler Road 0.14
First development as
residential in the 1940s-50s.
Currently unoccupied
residential.
Possible historic heating oil
use
1703347242 1008 Hammell Road 1.84
Historically used as a
trucking facility. Most recent
us for warehousing. Currently
unoccupied.
Historical USTs
Property Summar
TABLE 1
25075-21-092
Lake Wheeler Assemblage Phase I Redevelopment
Raleigh, North Carolina
Mixed use, commercial and residential
Data Gap Parcel ID Sampling Objective/Location Sample
Name Type Sample Default Sample
Depth*Analytical Program
Soil
Groundwater
Sub-Slab Soil Gas
Existing Commercial Building, Future
Building A Elevator and Stair Location SSSG-1
Existing Commercial Building, Near Future
Building B Retail Location SSSG-2
Exterior Soil Gas
Former UST Location ESG-1 5 feet
ESG-2 10 feet
ESG-3 7 feet
Future Building B Residential On-grade
Location ESG-4 10 feet
Future Building B Retail Location ESG-11 5 feet
Future Building A Retail Location ESG-12 10 feet
1201 Lake Wheeler Road
1703346551 Possible Residential Heating Oil Use ESG-5 7 feet
1205 Lake Wheeler Road
1703346551
Possible Residential Heating Oil Use,
Under Future Building A Elevator and
Stair Location
ESG-6 10 feet
1209 Lake Wheeler Road
1703346427
Possible Residential Heating Oil Use,
Under Future Building A, Near Mail
Room
ESG-7 5 feet
1213 Lake Wheeler Road
1703345483
Possible Residential Heating Oil Use,
Under Future Building A, Near Bike
Storage
ESG-8 7 feet
Possible Residential Heating Oil Use,
Under Future Building A, Parking ESG-9 5 feet
Under Future Building A, Parking ESG-13 20 feet
1217 Lake Wheeler Road
1703343287 Possible Residential Heating Oil Use ESG-10 5 feet
DUP-S-1 Soil 15 feet EPA 8260D, 8270E
and RCRA Metals
DUP GW-1 Groundwater, grab 30 feet EPA 8260D, 8270E
and RCRA Metals
DUP-SSSG-1 Sub-Slab, Soil Gas 1 foot TO-15
DUP-ESG-1 Exterior Soil Gas 5 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 7471B.
*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 and alternative sample depth.
Duplicate Samples**
Soil Gas, Sub-Slab 0.5 -1 foot (below
slab)
Former UST Location1008 Hammell Drive
1703348546
1008 Hammell Drive
1703348546
30 feet
TABLE 2a
Areas of Environmental Concern and Redevelopment Plan Sampling Summary
Lake Wheeler Assemblage Phase I Redevelopment
Raleigh, North Carolina
Soil, Grab
1008 Hammell Drive
1703348546 Former UST Location
S-1 15 feet EPA 8260D, 8270E
and RCRA Metals
EPA 8260D, 8270E
and RCRA Metals
TO-15
TCE< 0.5 ug/m3
Future Building B Elevator and Stair
Locations
Soil Gas, Exterior
1215 Lake Wheeler Road
1703344394
1008 Hammell Drive
1703348546
TO-15
TCE< 0.5 ug/m3
GW-1 Groundwater, grab
Block Approximate
Volume yd3
Boring
Count per
Block
Soil Sample
Name
Boring Depth*
(ft)
Layer
thickness (ft)Sample Depth* (ft)VOCs SVOCs RCRA
Metals***
Blk-A(s) 2.5
Blk-A(d) 7.0
B 1,900 3 Blk-B 13 13.0 6.5 G C C
C 2,251 3 Blk-C 9 9.0 4.5 G C C
Blk-D(s)4.0
Blk-D(m)12.0
Blk-D(d)20.0
Blk-E(s)4.0
Blk-E(d)12.0
F 2,440 3 Blk-F 13 13.0 6.5 G C C
G 1,853 4 Blk-G 9 9.0 4.5 G C C
H 2,430 3 Blk-H 11 11.0 5.5 G C C
I 2,111 3 Blk-I 11 11.0 5.5 G C C
J 2,185 3 Blk-J 11 11.0 5.5 G C C
K 1,308 4 Blk-K 6 3.0 3.0 G C C
L 2,022 3 Blk-L 16 16.0 8.0 G C C
M 1,555 4 Blk-M 6 3.0 3.0 G C C
N 2,014 3 Blk-N 16 16.0 8.0 G C C
O 1,550 3 Blk-O 13 13.0 6.5 G C C
Duplicate
Sample** 1 1 1
Totals 37627 50 20 20 20
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 7471B.
*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.
G: Grab Sample
C: Composite Sample
5,998
5,055
D
E
TABLE 2b
Beneficial Fill Sampling Summary
Lake Wheeler Assemblage Phase I Redevelopmen
Raleigh, North Carolina
A 9 4.55 G C C2,955
C C
G C C
3
3
G
25
16
8.0
8.0

FIGURES
´
TOPOGRAPHIC MAPSOUTH SAUNDERS STREET ASSEMBLAGE HAMMELL DRIVE, LAKE WHEELER ROAD, AND SOUTH SAUNDERS STREETRALEIGH, WAKE COUNTY, NORTH CAROLINA
DRAWN BY:DATE:
ENG. CHECK:
JOB NO:
APPROVAL:
DRAFTCHECK:GIS NO:
DWG NO:
REFERENCES:
SCALE:
NOVEMBER 2020
000R3633.00
3G-R3633.00-11
1. RALEIGH WEST , NC DIGITAL RASTER GRAPHICS, USGS. SCANNED FROM 1:24,000 TOPOGRAPHIC MAPS, PUBLISHED 2013, USGS.2. INSERT MAP DIGITAL DATA FROM 2002 NATIONAL TRANSPORTATION ATLAS, BUREAU OF TRANSPORTATION STATISTICS, WASHINGTON D.C.3. PROPERTY BOUNDARY DATA FROM NC ONEMAP.
CONTOUR INTERVAL = 10 FEET
0 1,000 2,000Feet
PHASE IREDEVELOPMENT
1:12,000
KRC
WAKE§¨¦I440
§¨¦I4
0
§¨¦U64
§¨¦U70
§¨¦I40
DHN
DHNDHN
AREA SHOWN WITHINWAKE COUNTY
PHASE IIREDEVELOPMENT
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Rickshaw Sorage &Screen Printing(2nd Floor)
Sun Warehouse(1st Floor)
DHHS Campus
CommercialBuilding Service
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Proposed Building A(Multi-Family Residential)
Proposed Building B(Multi-Family Residential)
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9
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NCCGIA, NC911 Board
´
DRAWN BY:KRC
Map ID Parcel Address Owner
9 1201 Lake Wheeler Road Caba Properties II, LLC
10 1205 Lake Wheeler Road Dix Park East, LLC
11 1209 Lake Wheeler Road Dix Park East, LLC
12 1213 Lake Wheeler Road Dix Park East, LLC
13 1215 Lake Wheeler Road Dix Park East, LLC
14 1217 Lake Wheeler Road Dix Park East, LLC
15 1008 Hammell Drive Dorothea Dix Development, LLC
DHN
DHN
NOTE: ONLY PARCELS ASSOCIATED WITH PHASE I REDEVELOPMENT ARE LISTED. EXISTINGSTRUCTURES WILL BE DEMOLISHED.
Legend
R(Residental Property
Map ID
Subject Property
Property Boundaries
Proposed Building Footprints
1
R(
R(
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Anything WithA Plug(2nd Floor)
Rickshaw Sorage &Screen Printing(2nd Floor)
Sun Warehouse(1st Floor)
DHHS Campus
CommercialBuilding Service
Vaca
n
t
x2
ESG-3
ESG-4
ESG-2
ESG-11
ESG-12
ESG-5
ESG-6
ESG-7
ESG-8
ESG-13
ESG-9
ESG-10
SSSG-2
SSSG-1
S-1, GW-1, ESG-1
x2
x2
x2Proposed Building A
Proposed Building B
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12
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NCCGIA, NC911 Board
´
DRAWN BY:KRC
Legend
$+Proposed Sub-Slab Soil Gas Sample Location
#*Proposed Exterior Soil Gas Sample Location
^_Proposed Soil, Groundwater, and Exterior Soil Gas Sample
³UST
k Paint Storage Staining
d Pole-Mounted Transformers
R(Residental Property
Location of 2008 Structure Fire
Map ID
Subject Property
Property Boundaries
1
Map ID Parcel Address Owner
9 1201 Lake Wheeler Road Caba Properties II, LLC
10 1205 Lake Wheeler Road Dix Park East, LLC
11 1209 Lake Wheeler Road Dix Park East, LLC
12 1213 Lake Wheeler Road Dix Park East, LLC
13 1215 Lake Wheeler Road Dix Park East, LLC
14 1217 Lake Wheeler Road Dix Park East, LLC
15 1008 Hammell Drive Dorothea Dix Development, LLC
TNB
DHN
Proposed Building Footprints
NOTE: ONLY PARCELS ASSOCIATED WITH PHASE I REDEVELOPMENT ARE LISTED
CommercialBuilding Service
Vaca
n
t
AREA E(9,100 sq ft)(5,055 cy)(Average 15 ft cut)
AREA L(3,900 sq ft)(2,022 cy)(Average 14 ft cut)
AREA J(5,900 sq ft)(2,185 cy)(Average 10 ft cut)
AREA N(3,200 sq ft)(1,896 cy)(Average 16 ft cut)
AREA O(3,350 sq ft)(1,550 cy)(Average 12.5 ft cut)
AREA M(8,400 sq ft)(1,555 cy)(Average 5 ft cut)
AREA K(8,830 sq ft)(1,308 cy)(Average 4 ft cut)
AREA D(7,900 sq ft)(5,998 cy)(Average 20.5 ft cut)
AREA A(11,400 sq ft)(2,955 cy)(Average 7 ft cut)
AREA I(6,000 sq ft)(2,111 cy)(Average 9.5 ft cut)
AREA H(6,250 sq ft)(2,430 cy)(Average 10.5 ft cut)
AREA F(5,500 sq ft)(2,440 cy)(Average 12 ft cut)
AREA B(4,300 sq ft)(1,900 cy)(Average 12 ft cut)
AREA C(7,600 sq ft)(2,251 cy)(Average 8 ft cut)
AREA G(9,100 sq ft)(1,853 cy)(Average 5.5 ft cut)
A1
A2
A3
A4
A5
B1 B2
B3
C2
C3
C1
G3
G4
G2
G1F1
F2
F3
H1
H2
H3
E1
E2
E3
D1
D2
D3
I1
I2
I3
J1 J2
J3
K1
K2
K3
K4
M1
M2
M3
M4
O1 O2
O3
L1
L2
L3
N3
N2
N1

Ham
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D
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Lake W
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S
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S S
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s

S
t
NCCGIA, NC911 Board
´
DRAWN BY:KRC
Legend
Proposed Soil Sample Location
Subject Property
Property Boundaries
0-6 Ft Cut
0-9 Ft Cut
0-11 Ft Cut
0-13 Ft Cut
0-16 Ft Cut
0-25 Ft Cut
TNB
DHN
NOTE: CUT/FILL DIAGRAM PROVIDED HAS BEEN MODIFIED IN ARCGIS SOFTWARE

ATTACHMENT A TABULAR SUMMARY OF HISTORICAL ANALYTICAL DATA

ATTACHMENT B COMPLETED VAPOR INTRUSION ASSESSMENT WORK PLAN & REPORT CHECKLIST