21047_High Point Multi Stadium_DM_20201015

DECISION MEMORANDUM
DATE: October 15, 2020
FROM: Reina Clark/Sharon Eckard
TO: BF Assessment File
RE: High Point Multi Stadium
275, 285, 301, & 305 N. Elm Street
224 Pine Street, 209 Appling Way, &
218 N. Lindsay Street
High Point, Guilford County
Brownfields Project No. 21047-17-041
Based on the following information, it has been determined that the above referenced
site, whose intended use is for no uses other than a multi -purpose stadium facility,
recreational and entertainment venue, high density residential, hotel, retail, restaurant,
food and beverage processing, brewery, office, open space including a public park, and
associated parking uses, and with prior written DEQ approval, other commercial uses,
can be made suitable for such uses.
Introduction:
The Prospective Developer is the City of High Point, a municipality with its principal
office located at 211 South Hamilton Street, Room 320, High Point, North Carolina,
27260. The City of High Point is governed by a Council -Manager form of government
with the City Council being the Governing Body of the City. The City Council consists
of the Mayor and eight council members. The City Manager is the Chief Executive
Officer of the City. The Interim City Manager of High Point is Randy McCaslin and the
Mayor is Jay W. Wagner.
The Brownfields Property originally comprised 31 parcels in downtown High Point
totaling 11.35 acres; however, the Prospective Developer requested the removal of six
parcels (Parcel ID Nos. 186822, 186823, 186821, 186833, 186819, and 186820) on
September 12, 2019. The 25 parcels remaining in the Brownfields Property are Parcel ID
Nos. 0186812, 0186807, 0186805, 0186806, 0186808, 0186810, 0186814, 0186811,
0186799, 0186828, 0186800, 0186815, 0186813, 0186825, 0186826, 0186827, 0186834,
0186838, 0186835, 0186832, 0186818, 0186817, 0186831, 0186830. These 25 parcels
have been recombined into seven parcels totaling 11 acres; including an additional 0.22
acres from a portion of the street named Appling Way, the Brownfields Property totals
11.22 acres.
The recombination is summarized in the table below:
High Point Multi Stadium/21047-17-041/150ct2020

Redevelopment
Area
Former Address
Former
Parcel
ID No.
Former
Acreage
New Parcel
Address
New
Parcel
ID No.
New
Acreage'
A
307 N. Elm St.
186810
0.12
305 N. Elm St.
186814
0.56
305 N. Elm St.
186814
0.47
B
N/A
N/A
N/A
285 N. Elm St.
229500
0.17
C
201 Church Ave.
186835
0.57
275 N. Elm St.
186835
0.59
216 Pine St. (NE)2
1868383
0.71
D
210 Church Ave.
186812
1.44
301 N. Elm St.
186812
6.98
211 Gatewood Ave.
186807
0.33
215 Gatewood Ave.
186805
0.21
213 Gatewood Ave.
186806
0.21
207 Gatewood Ave.
186808
0.32
201 Church Ave. NW
186835
0.57
206 Church Ave. NE
186811
0.21
303 Gatewood Ave.
186799
0.56
300 Church Ave.
186800
0.84
308 Pine St.
186813
0.16
217 Gatewood Ave.
186815
0.41
305 Church Ave. NE
186828
0.31
211 Pine St. E
186827
0.48
215 Church Ave. N
186834
0.46
216 Pine St.
1868383
0.71
G
215 Church Ave. S
186834
0.46
224 Pine St.
186838
0.42
216 Pine St. S
1868383
0.71
H
305 Church Ave. SW
186828
0.31
218 N. Lindsay St.
186830
1.42
211 Pine St. SW
186827
0.48
212 N. Lindsay St. W
186832
0.17
210 N. Lindsay St. W
186818
0.21
214 N. Lindsay St.
186817
0.17
216 N. Lindsay St.
186831
0.17
218 N. Lindsay St.
186830
0.26
307 Church Ave.
186829
0.25
1
212 N. Lindsay St. E
186832
0.17
209 Appling Way
186825
0.86
210 N. Lindsay St. E
186818
0.21
207 Pine St.
186825
0.27
209 Pine St.
186826
0.27
'New acreage for the new parcels obtained from the Guilford County GIS data viewer
(gis.guilfordcountync.gov) ) and total 11 acres; an additional 0.22 acres of Appling Way is also included
in the Brownfields Property for a total of 11.22 acres.
2NE-Northeast, E-East, N-north, S-south, SW -southwest, W-west, and NW -northwest
3Portions of tax parcel 186838 were subject to a prior Brownfields Agreement referred to as the Adam
Millis Brownfields Agreement
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High Point Multi Stadium/21047-17-041/150ct2020

Portions of Redevelopment Areas "C," "D," and "G" are subject to a prior Brownfields
Agreement (Adams Millis, Brownfields Project No. 15013-11-041), which was recorded
on June 24, 2013 (Guilford County Register of Deeds, Book 7499, Page 1206). This
current Agreement supersedes the original Brownfields Agreement, recorded on June 24,
2013, for those portions of Redevelopment Areas "C", "D", and "G" as referenced above
and replaces its land use restrictions respective to the portions of those parcels included in
this current Agreement with those provided in paragraph 15 of the High Point Multi
Stadium Brownfield Agreement. It is the intent of DEQ and the Prospective Developer
that the execution and recordation of this current Agreement between DEQ and
Prospective Developer shall not in any way impact any other person's existing liability
protection under the Brownfields Property Reuse Act and previously entered Brownfields
Agreements. Specifically, this current Agreement shall not alter the existing liability
protection of any applicable person included in Section 130A-310.33 of the Brownfields
Property Reuse Act as provided by the respective agreement attached as Exhibit A to the
Adams -Millis Notice of Brownfields Property that was recorded on June 24, 2013 at the
Guilford County Registry of Deeds (Book 7499, Page 1206).
Redevelopment Plans:
Parcels recombined and referenced on the Brownfields Plat as Redevelopment Area "D"
have been redeveloped as the High Point Multi Stadium that was completed in April 2019
and which opened for its inaugural season on May 1, 2019. The parcel referenced on the
Brownfields Plat as Redevelopment Area `B" has been redeveloped as open space and
ticket booth for sales to the stadium.
The City of High Point still owns Redevelopment Area A. At one time there were plans
to redevelop this area with a I I8-room hotel with a 5,000 square foot restaurant and retail
shops on the "Plaza level"; however, those plans may have be delayed due to the effects
of the Covid-19 pandemic.
The follow-on owner of Redevelopment Area C, 275 North Elm Partners, LLC, broke
ground in October 2019 for the redevelopment of the parcel into a structure with
approximately 18,000 square feet of retail and 33,500 square feet of office space.
The City of High Point still owns the parcels referred to as Redevelopment Area G, H,
and I. At one time, a potential follow-on owner of Redevelopment Area G planned to
redevelop Area G with a mixed commercial and residential structure to include
approximately 5,000 square feet of dining space, 14,000 square feet of office space, and
approximately 20 residential units and Area H with a residential structure including
approximately 130 units of rental apartments. However, those plans may have be delayed
due to the effects of the Covid-19 pandemic.
There are no existing plans for the redevelopment of Redevelopment Area "I".
High Point Multi Stadium/21047-17-041/150ct2020

Site History:
The Brownfields Property originally included a total of 31 parcels with a mix of historical
uses. Parcels were developed as early as 1890 and have been redeveloped over several
decades. Historically, the Brownfields Property was occupied by residential structures
(1906-present), medical offices, the High Point Enterprise print shop (1969-2009), former
gasoline station (1950-1965), hosiery mill (former Adams Millis 1950-2005), storage,
and automotive repair shops (1969-2013). The Brownfields Property is currently
developed with the High Point multi -use stadium and other portions of the Brownfields
Property are under construction, particularly Redevelopment Area "C" and new roadway
construction.
Sources of contamination at the Brownfields Property stem primarily from a solvent
release containing trichloroethylene (TCE) from the printing shop and from releases from
petroleum underground storage tanks (USTs), either from home heating oil or related to
the former gasoline service station and automotive repair shops located on these parcels.
A series of hydraulic lifts and the USTs on these parcels were removed in 2018 to make
way for the construction of the stadium.
Potential Receptors:
Potential receptors are: construction workers, on -site workers, future residents, visitors,
and trespassers.
Contaminated Media:
DEQ has evaluated data collected from the following media at the subject property: soil,
groundwater, soil gas, pre -construction sub -slab vapor, post -construction sub -slab vapor
in the stadium and ticket booth, and post -construction indoor air in the stadium and ticket
booth. DEQ relies on the following data to base its conclusions regarding the subject
property and its suitability for its intended reuse.
Soil
Soil contaminants at the Brownfields Property are limited to arsenic values ranging from
0.77 milligrams per kilogram (mg/kg) to 9.1 mg/kg, in excess of the residential
preliminary soil remedial goal (PSRG) of 0.68 milligrams per kilogram (mg/kg) and the
industrial PSRG of 3 mg/kg, and several polynuclear aromatic hydrocarbons (PAHs),
including benzo(a)pyrene ranging from 0.15J mg/kg to 0.29J mg/kg above a PSRG of
0.11 mg/kg, naphthalene ranging from 4.32 mg/kg to 7.64 mg/kg exceeding a PSRG of
4.1 mg/kg, and one sample of pyrene at 495 mg/kg, exceeding a PSRG of 360 mg/kg. In
addition, phenanthrene, benzo(g,h,i)perylene, and 4-isopropyltoluene were detected, but
do not have an established regulatory PRSG.
Groundwater
Groundwater contaminants at the Brownfields Property in excess of their respective NC
2L groundwater standards include the metals arsenic (20 micrograms per liter (µg/L) to
64 µg/L, barium (710 µg/L to 13,000 µg/L), chromium (10 µg/L to 3,800 µg/L), lead (15
µg/L to 660 µg/L), and mercury in one sample at 1.3 µg/L; the petroleum hydrocarbons
in one sample, TW-12 with n-butylbenzene at 130 µg/L, sec-butylbenzene at 81 µg/L,
4
High Point Multi Stadium/21047-17-041/15Oct2020

cumene at 270 µg/L, 1-methylnaphthalene at 35 µg/L, 2-methylnaphthalene at 74 µg/L,
naphthalene at 580 µg/L, and propyl benzene at 410 µg/L; and the chlorinated solvents
tetrachloroethylene (PCE) in three wells, MW-3, TW-11 and TW-12 ranging in
concentration from 0.82 µg/L to 4.3 µg/L, in excess of its NC 2L standard of 0.7 µg/L,
trichloroethylene (TCE) in seven wells ranging from 8.3 µg/L to 1,400 µg/L, in excess of
its NC 2L of 3 µg/L, vinyl chloride in three wells ranging from 1.4 µg/L to 13 µg/L, 1,2-
dichloroethane in one well, TW-11 at 0.83 µg/L, in excess of its NC 2L of 0.4 µg/L, and
cis-1,2-dichloroethylene in two wells ranging from 82 µg/L to 330 µg/L in excess of its
NC 2L of 70.
Offsite groundwater sampling indicated that chlorinated solvent groundwater
contamination believed to have originated from the former High Point Enterprises
printing operations had migrated northward offsite across Gateway Blvd where a medical
office building with a basement was situated. The PD voluntarily conducted sub -slab soil
gas and indoor air sampling within the onsite structure to determine if an unacceptable
vapor intrusion risk scenario existed at the facility. Elevated concentrations of TCE were
detected in indoor air sampled from the basement area of the structure. Upon further
investigation, an open sump was identified within the basement area and was
subsequently closed. Following closure of the sump, an additional round of indoor air
sampling was conducted by the owners of the facility. The analytical results of that
sampling indicated that there was not an unacceptable vapor intrusion risk for a non-
residential use scenario.
Surface Water
Surface water is not located on the site.
Soil Gas
During Phase II environmental assessment conducted in August 2019, exterior soil gas
samples were collected from parcels to be developed as Redevelopment Areas "C", "G",
and "H", which are slated for residential and non-residential redevelopment. Benzene and
ethylbenzene were detected in soil gas sample SG-3 at 490 micrograms per meter cubed
(µg/m3) and 710 µg/m3, respectively, exceeding their respective residential vapor
intrusion screening levels (VISLs) of 120 µg/m3 and 370 µg/m3. Sample SG-3 was
collected on Redevelopment Area "G", which is planned as residential reuse. In addition,
several compounds without established VISLs were detected in soil gas samples SG-1
through SG-5, including dichlorotetrafluoroethane, 4-ethyltoluene, and
trichlorofluoromethane.
Sub -Slab Vapor
Pre -construction sub -slab vapor samples collected in September 2016 included ten sub -
slab soil gas samples at the former High Point Enterprise building. Of the 10 samples,
laboratory analysis indicated only TCE in sub -slab soil gas sample SSG-07, exceeded
VISLs. TCE in this sample at a concentration of 230 µg/m3 exceeded both the residential
and nonresidential VISLs for TCE of 14 µg/m3 and 180 µg/m3, respectively. However,
the samples were collected with a mini -canister and all of the non -detects were associated
5
High Point Multi Stadium/21047-17-041/150ct2020

with very high reporting limits in the range of 100 to 1,000 µg/m3. Therefore, most of
this data is not defensible as true non -detectable concentrations.
Due to the known presence of volatile organic compounds (VOCs) in groundwater,
especially TCE in excess of the nonresidential VISL at the former High Point Enterprise
property, following construction of the High Point Stadium, 19 sub -slab vapor pins were
installed to monitor sub -slab soil vapor beneath the stadium and separately located ticket
building. Post -construction sub -slab soil vapor samples were collected from each
monitoring point in April and August 2019. Several compounds were detected, but each
at concentrations below their respective residential and non-residential VISLs. The
nonresidential VISLs are used for comparison purposes in Exhibit 2 to the Brownfields
Agreement because they were collected solely from below the newly constructed stadium
and separate ticket building slabs. Several compounds, 1,3-dichlorbenzene,
dichlorotetrafluoroethane, 4-ethyltoluene, and trichlorofluoromethane were detected in
the post -construction sub -slab vapor samples, but they do not have established VISLs.
Indoor Air
Due to the known presence of VOCs in groundwater, especially TCE in excess of the
nonresidential VISL at the former High Point Enterprise property, 25 post -construction
indoor air samples were collected from within the stadium and ticket building in April
2019. The indoor air concentrations are compared with the nonresidential VISLs because
these samples were collected only in the stadium and separate ticket building itself, which
are not residential in nature.
In the April 2019 sampling round, benzene, chloroform, ethylbenzene, naphthalene, TCE,
1,2,4-trimethylbenzene, and total xylenes were detected in one or more indoor air
samples at concentrations exceeding their respective non-residential VISLs.
Trichloroethylene (TCE) was detected in one indoor air sample, A-7, at a concentration
of 1.9 µg/m3, exceeding its non-residential VISL of 1.8 µg/m3.
A second indoor air sampling event was conducted in August 2019. In certain samples,
concentrations of constituents that were detected in the April 2019 round were not
detected in the August 2019 round or were detected at concentrations below the
nonresidential VISL for that compound. Concentrations that were detected included
benzene (2.7 µg/m3 to 3.1 µg/m3), ethylbenzene (1.4 µg/m3 to 31.4 µg/m3), and
naphthalene (4.3 µg/m3 to 4.7 µg/m3) were detected in indoor air samples at
concentrations exceeding their respective non-residential VISLs of 1.6 µg/m3, 4.9 µg/m3,
and 0.36 µg/m3. In addition, in certain samples laboratory method detection limits for
compounds chloroform and naphthalene exceeded the non-residential VISLs of 0.53
µg/m3 and 0.36 µg/m3, respectively.
Risk Calculations
Risk calculations were performed using the DWM Risk Calculator (July 2020 version).
For the purposes of looking at the site spatially, the site was divided into five
redevelopment Areas: the Multi Stadium, and Areas C, G, H, and I. The risk calculations
indicated the following based on available data, including the following media:
6
High Point Multi Stadium/21047-17-041/150ct2020

groundwater, residual soil (based on confirmatory soil data), pre- and post -construction
sub -slab vapor data (stadium and ticket building only), exterior soil gas, and post -
construction indoor air samples (stadium & ticket building only):
Stadium Building — Pre -construction soil and groundwater and post -construction sub -slab
vapor and indoor air:
Risk for Individual Pathways
Version Date: July 2020
Basis: May 2020 EPA RSL Table
Site ID: 21047-17-041
Exposure Unit ID: Stadium - Pre-constr Soil & GW;post-constr SSV & Indoor Air
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carciinnogenic
sk
Hazard Index
Riskexceeded?
Resident
Soil
2.6E-05
9.2E-01
NO
Groundwater Use*
5.9E-02
6.6E+02
YES
Non -Residential Worker
Soil
5.3E-06
1.5E-01
NO
Groundwater Use*
7.0E-03
1.5E+02
YES
Construction Worker
Soil
8.2E-07
8.3E-01
NO
Recreator/Trespasser
Soil
1.4E-05
2.6E-01
NO
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
CarcinogenicRisk
Hazard Index
Risk exceeded?
Resident
Groundwater to Indoor Air
1.5E-03
2.8E+02
YES
Soil Gas to Indoor Air
4.4E-06
2.2E-01
NO
Indoor Air
9.2E-05
4.5E+00
YES
Non -Residential Worker
Groundwater to Indoor Air
2.4E-04
6.6E+01
YES
Soil Gas to Indoor Air
3.3E-07
1.7E-02
NO
Indoor Air
2.1E-05
1.1E+00
YES
Redevelopment of the stadium parcels (Redevelopment Area "D") was completed in
April 2019. The risk calculations indicate that groundwater use exceeds both an
acceptable carcinogenic risk range and a threshold hazard index of 1 for both residential
and nonresidential exposure scenarios, and suggests that groundwater contaminants pose
an unacceptable risk to indoor air for both residential and nonresidential uses. Soil
concentrations do not pose an unacceptable risk for residential, non-residential,
construction worker, or recreator/trespasser scenarios.
Two monitoring events of post -construction sub -slab soil vapor beneath the newly
constructed stadium & ticket buildings and indoor air within the stadium & ticket
buildings indicate an unacceptable noncancer risk for occupants of these spaces in both
residential and non-residential scenarios based on indoor air concentrations, while the
calculated risks associated with post -construction sub -slab vapor concentrations are
acceptable for both residential and nonresidential scenarios. The calculated risks
associated with contaminants in indoor air are driven by the concentrations of total
xylenes and naphthalene, which were detected in higher concentrations in indoor air vs
sub -slab vapor samples. This indicates that these VOCs are likely the result of indoor air
interference from products, likely finishing products, in use at the time or shortly before
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High Point Multi Stadium/21047-17-041/150ct2020

sampling in those particular spaces, and that they do not appear to be the result of vapor
intrusion.
An active sub -slab depressurization system was installed in the multi -use baseball
stadium; however, the system does not include sub -grade vertical walls with potentially
elevated groundwater such that there is no vertical barrier on the walls that may be in
contact with elevated groundwater. This provides a potential pathway for vapor intrusion.
A passive VIMS was installed in the ticket booth fronting Elm Street.
A limited sub -slab and indoor air monitoring event should be performed within the next
few weeks to confirm that the environmental risks calculated based on 2019 data are still
consistent or demonstrate conditions in which acceptable environmental risk is not
exceeded.
Post -Construction Ticket Building — Post construction sub -slab vapor and indoor air only
Risk for Individual Pathways UJIMPt 1 011
Version Date: July 2020
Basis: May 2020 EPA RSL Table
Site ID: 21047-17-041
Exposure Unit ID: Post -construction Ticket B1 - Sub -slab Vapor & Indoor Air only
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carciinnogenic
sk
Hazard Index
Risk exceeded?
Resident
Soil
NC
NC
NC
Groundwater Use*
NC
NC
NC
Non -Residential Worker
Soil
NC
NC
NC
Groundwater Use*
NC
NC
NC
Construction Worker
Soil
NC
NC
NC
Recreator/Trespasser
Soil
NC
NC
NC
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazard Index
Risk exceeded?
Resident
Groundwater to Indoor Air
NC
NC
NC
Soil Gas to Indoor Air
8.6E-06
2.8E-01
NO
Indoor Air
9.6E-05
3.9E+00
YES
Non -Residential Worker
Groundwater to Indoor Air
NC
NC
NC
Soil Gas to Indoor Air
6.6E-07
2.2E-02
NO
Indoor Air
2.2E-05
9.3E-01
NO
The ticket building sits apart from the main stadium building and the post -construction
sub -slab and indoor air data is presented separately from the stadium building. Based on
the data collected the soil gas to indoor air pathways for both residential and non-
residential worker scenarios are within acceptable limits. However, the indoor air
concentrations obtained from within the ticket building indicates that the noncancer
threshold hazard index is exceeded for residential use, but not for nonresidential use,
which is its purpose. This is driven by the concentrations of xylenes and naphthalene
detected in indoor air; however, since the soil gas to indoor air risk is acceptable, but the
indoor air risk exceeds for residential uses, this is likely due to indoor air interference and
not from vapor intrusion. Further, the ticket building is only partially occupied and is not
used as a residence.
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High Point Multi Stadium/21047-17-041/150ct2020

Redevelopment Area C - 275 North Elm Partners, LLC -owned retail and office space
Risk for Individual Pathways
Version Date: July 2020
Basis: May 2020 EPA RSL Table
Site ID: 21047-17-041
Ex sure Unit ID: Redevelopment Area C
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carciinnogenic
sk
Hazard Index
Risk exceeded?
Resident
Soil
6.6E-06
1.5E-01
NO
Groundwater Use*
3.7E-04
4.2E+00
YES
Non -Residential Worker
Soil
1.5E-06
1.3E-02
NO
Groundwater Use*
7.3E-05
6.7E-01
NO
Construction Worker
Soil
2.5E-07
1.3E-01
NO
Recreator/Trespasser
Soil
3.7E-06
8.0E-02
NO
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
CarcinogenicRisk
Hazard Index
Risk exceeded?
Resident
Groundwater to Indoor Air
0.0E+00
2.5E-01
NO
Soil Gas to Indoor Air
6.0E-06
1.9E-01
NO
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
0.0E+00
5.9E-02
NO
Soil Gas to Indoor Air
4.6E-07
1.5E-02
NO
Indoor Air
NC
NC
NC
Proposed redevelopment of Redevelopment Area C includes only non-residential uses.
Potential environmental risk calculated for groundwater use indicated an unacceptable
risk for groundwater under a residential exposure pathway. Soil contaminants do not
appear to pose an unacceptable environmental risk for residential, nonresidential,
construction worker, nor recreator/trespasser exposure pathways in this area.
Potential environmental risk calculated for soil gas data does not indicate an unacceptable
vapor intrusion risk for residential nor non-residential exposure scenarios based on the
data collected from this area. Note these data are from soil gas collected on a vacant lot,
and therefore do not reflect sub -slab conditions.
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High Point Multi Stadium/21047-17-041/150ct2020

Redevelopment Area G - mixed commercial and residential units
Risk for Individual Pathways
Version Date: July 2020
Basis: May 2020 EPA RSL Table
Site ID: 21047-17-041
Exposure Unit ID: Redevelopment Area G
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carciinn genic
sk
Hazard Index
Risk exceeded?
Resident
Soil
1.9E-06
4.3E-02
NO
Groundwater Use*
4.7E-08
4.0E-02
NO
Non -Residential Worker
Soil
4.3E-07
3.1E-03
NO
Groundwater Use*
1.0E-08
6.8E-03
NO
Construction Worker
Soil
7.2E-08
3.7E-02
NO
Recreator/Trespasser
Soil
1.1E-06
2.4E-02
NO
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
CarcinogenicRisk
Hazard Index
Risk exceeded?
Resident
Groundwater to Indoor Air
1.5E-09
5.6E-06
NO
Soil Gas to Indoor Air
6.0E-05
1.0E+00
YES
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
3.4E-10
1.3E-06
NO
Soil Gas to Indoor Air
4.6E-06
8.3E-02
NO
_
Indoor Air
NC
NC
NC
Proposed redevelopment of Redevelopment Area G includes both a commercial and
residential component. Based on available data, risks calculated for soil and groundwater
use indicate an acceptable environmental risk for residential exposure to soil and
groundwater in this area.
Potential risks calculated for soil gas data (not sub -slab data) indicate a noncancer hazard
index at 1.0, the hazard index threshold, for residential soil gas to indoor air vapor
intrusion risk. Acceptable risks are not exceeded for nonresidential worker exposure
pathways based on available data.
Either additional assessment data or the pre-emptive installation of a vapor intrusion
mitigation system (VIMS) during the construction of Area G to mitigate potential vapor
intrusion risk at this location should be undertaken to ensure safe reuse of particularly the
residential component of the redevelopment.
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High Point Multi Stadium/21047-17-041/150ct2020

Redevelopment Area H — residential apartments
Risk for Individual Pathways
Version Date: July 2020
Basis: May 2020 EPA RSL Table
Site ID: 21047-17-041
Exposure Unit ID: Redevelopment Area H
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carciinn genic
sk
Hazard Index
Risk exceeded?
Resident
Soil
8.0E-06
1.8E-01
NO
Groundwater Use*
0.0E+00
6.3E-02
NO
Non -Residential Worker
Soil
1.8E-06
1.7E-02
NO
Groundwater Use*
0.0E+00
1.0E-02
NO
Construction Worker
Soil
3.0E-07
1.5E-01
NO
Recreator/Trespasser
Soil
4.4E-06
8.9E-02
NO
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
CarcinogenicRisk
Hazard Index
Risk exceeded?
Resident
Groundwater to Indoor Air
0.0E+00
0.0E+00
NO
Soil Gas to Indoor Air
7.5E-06
6.9E-02
NO
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
0.0E+00
0.0E+00
NO
Soil Gas to Indoor Air
4.9E-07
5.5E-03
NO
Indoor Air
NC
NC
NC
The proposed redevelopment of Redevelopment Area H includes residential apartments,
although currently the site is developed with former residential structures being utilized
as commercial office space. Potential risk calculated for groundwater and soil gas data
(not sub -slab data) do not indicate an unacceptable vapor intrusion risk for a residential
risk scenario of Redevelopment Area H.
High Point Multi Stadium/21047-17-041/150ct2020

Redevelopment Area I — no planned reuse at this time
Risk for Individual Pathways 1
Version Date: July 2020
Basis: May 2020 EPA RSL Table
Site ID: 21047-17-041
Exposure Unit ID: Redevelopment Area I
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carciinnogenic
sk
Hazard Index
Riskexceeded?
Resident
Soil
NC
NC
NC
Groundwater Use*
3.8E-02
3.7E+01
YES
Non -Residential Worker
Soil
NC
NC
NC
Groundwater Use*
3.8E-03
8.5E+00
YES
Construction Worker
Soil
NC
NC
NC
Recreator/Trespasser
Soil
NC
NC
NC
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carci iskeme
Hazard Index
Risk exceeded?
Resident
Groundwater to Indoor Air
7.6E-06
2.0E+00
YES
Soil Gas to Indoor Air
5.4E-06
1.1E-01
NO
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
1.3E-06
4.7E-01
NO
Soil Gas to Indoor Air
3.6E-07
8.6E-03
NO
Indoor Air
NC
NC
NC
The proposed redevelopment of Redevelopment Area I is unknown at this time. It is
located adjacent to the Piedmont Electric site. No soil data is available at this area at this
time. Potential risks calculated for groundwater data indicated that both an acceptable
carcinogenic risk and the noncancer threshold hazard index of 1 are exceeded for both
residential and nonresidential scenarios. Also the groundwater to indoor air risk for
noncancer risk is exceeded for residential scenarios, while the soil gas to indoor air
calculations are not exceeded.
Additional assessment of this area once a redevelopment plan is known should be
evaluated before determining whether a VIMS or other mitigation measures should be
taken.
Required Land Use Restrictions:
The Brownfields Agreement for this property will include the standard land use
restrictions for the prohibition on groundwater use, soil restrictions, EMP requirement,
vapor intrusion mitigation, use of known contaminants, access, notifications, well
abandonment, and LURU reporting.
Based on the site -specific data provided to the Brownfield program, the site can be made
suitable for the intended reuses at the site as long as the agreed upon land use restrictions
in the BFA are abided by.
12
High Point Multi Stadium/21047-17-041/150ct2020

Brownfields Property Management Unit:
Additional information should be evaluated as more is known about redevelopment plans
for these other areas.
Additional assessment of sub -slab and indoor air conditions should be conducted to
confirm environmental risk calculations in the stadium and ticket building.
13
High Point Multi Stadium/21047-17-041/15Oct2020