HomeMy WebLinkAbout22058_Erwin Mill_DM_20221109DECISION MEMORANDUM
DATE: November 9, 2022
FROM: Kathleen Markey/Sharon Eckard
TO: BF Assessment File
RE: Erwin Mill
200 North 13th Street
Erwin, Harnett County
BF # 22058-18-043
Based on the following information, it has been determined that the above referenced
site, which originated as a Ready -For -Reuse (RFR) project, has been updated with an
eligible Prospective Developer's redevelopment plan, and whose intended use is for no
uses other than finished product warehousing, light industrial or manufacturing, furniture
production, beverage or food production, retail, associated parking, and subject to DEQ's
prior written approval, other commercial and limited high density residential use, can be
made safe for such reuse.
Introduction
The Prospective Developer (PD) is 200 North 13 LLC. The managers of the PD entity are
Michael Schlesinger and Moshe Silberstein of Brooklyn, NY. The PD intends on
purchasing the Brownfields Property after the BF documents are finalized and recorded.
The Proxy -Prospective Developer (PPD) for the Erwin Mill RFR Brownfields site
located at 200 North 13th Street in Erwin North Carolina is Erwin Plant, LLC. Erwin
Plant, LLC currently owns the site, however, the PPD cannot be deemed eligible to be
prospective developer nor would be eligible to obtain environmental liability protection
under this proposed brownfields agreement. The Brownfields Property is comprised of
one parcel totaling 55.25 acres and is located at 200 North 13th Street in Erwin, North
Carolina. The property was decommissioned as a textile manufacturing facility in 2000,
although portions of the site have been leased out for a variety of uses, including county
offices, warehousing, light manufacturing of rifles and ammunition, and a cabinet shop.
Redevelopment Plans:
The PD is committed to use of the site for warehousing and distribution, furniture
manufacturing, and food and beverage production to a variety of tenants. At the PPD's
insistence, additional assessment was conducted in 2021 to evaluate certain areas of the
site for residential use. Such residential use is conditional and subject to restrictions in
the BFA; areas where residential use may be contemplated are further defined on the
Brownfields Plat (Exhibit B to the Notice of Brownfields Property). Although the PD
has no plans for residential use at this time, they are interested in keeping the language in
the BFA to allow for greater future flexibility in the property's use.
Site History:
Erwin Mill/22058-18-043/09NoQ022
The Erwin Mill facility was originally constructed in 1904 as a textile mill for the
production of denim by Erwin Cotton Mills. Additions to the original plant construction
took place over several decades. Textile operations included both dry and wet processing
areas, including a couple different locations of a dye house and chemical storage areas.
The facility operated its own coal -fed boiler plant, and at some point in the mid- 1900s,
converted an in -ground fire suppression water reservoir into a waste dye lagoon to
manage waste flow to an off -site wastewater treatment plant. At times, certain areas of
the warehouse facilities were also used for garage and maintenance activities.
Textile operations ceased on the Brownfields Property in 2000, at which time much of
the equipment and material associated with the textile mill was removed and several of
the buildings were demolished between 2009 and 2010. Since 2000, some of the
buildings were occupied by small business tenants for a variety of uses, including county
offices, warehousing, light manufacturing of rifles and ammunition, and a cabinet shop.
A small building which housed explosive materials was located on the Brownfields
Property.
The PPD has been working in accordance with US Environmental Protection Agency
(EPA) federal regulations to address the known onsite residual polychlorinated biphenyl
(PCBs) contamination at multiple transformer locations across the Brownfields Property
during its history. There were at least 35 transformers onsite, with 16 transformers
containing PCB -laden oils while the remaining 19 transformers contained PCB -free oils
such as silicone. The non -PCB transformers were removed from the Brownfields
Property between 1994 and 2020, and the PCB transformers were removed in either 2009
(6 transformers) or 2020 (10 transformers). The EPA conducted a PCB inspection at the
Erwin Plant on November 21, 2019, at which time several potential areas of non-
compliance were identified which may be the subject of an EPA enforcement action
against the current property owner. On February 14, 2022, EPA issued a Modification of
Approval of Polychlorinated Biphenyl Cleanup Activities. The current property owner
has worked with EPA to remove the remaining transformers. Additionally, the PPD
removed most of the PCB -impacted soil from the Brownfields Property. An area of
impacted soil was inaccessible and PCB concentrations above 1 milligram per kilogram
(mg/kg) within this area remain at the site. This area (Tunnel Area/Encapsulated Area) is
the subject of a NOTICE OF RESTRICTION PURSUANT TO 40 CFR 761.61 that was
recorded at the Harnett County Register of Deeds for this area of the Brownfields
Property on July 25, 2022 (Book 4160, Page 578-695). This NOTICE is incorporated
into the Brownfields Agreement and is provided as Exhibit 3 to this Brownfields
Agreement.
The Brownfields Property was purchased by Burlington Industries in 1962. Burlington
Industries merged with Swift Textiles in 1987 and operated under that name until
operations ceased in 2000. The Brownfields Property was purchased by Schwarz-Auman
Properties, LLC (the former legal name of Erwin Plant LLC, the PPD) on September 20,
2001. The PD expects to purchase the Brownfields Property after the BF documents are
recorded, potentially in November 2022.
2
Erwin Mill/22058-18-043/09NoQ022
Potential Receptors:
Potential receptors are: construction workers, on -site workers, future residents, visitors,
animals (dog park/farm animals), and trespassers.
Contaminated Media:
DEQ has evaluated data collected from the following media at the subject property:
groundwater, soil, exterior soil gas, sub -slab vapor, indoor air, surface water, and
sediment. DEQ relies on the following data to base its conclusions regarding the
Brownfields Property and its suitability for its potential reuse.
Due to the large size of the Erwin Mill Site, it has been divided into multiple separate
areas based on historic source areas and the sampling results, and the areas for which the
PPD wanted to evaluate future residential use. Accordingly, we analyzed the sample data
within these areas with corresponding DEQ risk calculators that were completed for each
of these separate areas.
FORMER INDUSTRIAL AREAS:
Soil -Former Industrial Areas
Soil samples were taken most recently from depths ranging from 0-10 feet below ground
surface (bgs) in 2019, and specifically to address the PCB -impacted soil under the
jurisdiction of EPA in December 2021. Results of the soil sampling in the former
industrial areas indicate exceedances of DWM Industrial Preliminary Soil Remediation
Goals (PSRGs). Specifically, there are exceedances of arsenic above its PSRG of 3.0
milligrams per kilogram (mg/kg) at soil sample locations MW-13 at 3.2 mg/kg, SB-26 at
3.5 mg/kg, SB-27 at 3.2 mg/kg, SB-31 at 3.2 mg/kg, SB-40 at 3.9 mg/kg, SB-41 at 3.1
mg/kg, SB-42 at 3.4 mg/kg, SB-42 at 3.4 mg/kg, SB-43 at 3.4 mg/kg, SB-44 at 3.6
mg/kg, D-1 at 3.3 mg/kg, D-2 at 3.2 mg/kg, and OS-2 at 3.0 mg/kg. Two soil samples
exceeded the PSRG of 21 mg/kg for benzo[a]anthracene at sample locations MW-13 at
180 mg/kg and OS-2 at 1,000 mg/kg. Benzo[b]fluoranthene exceeded the PSRG of 21
mg/kg at MW-13 and OS-2. Benzo[a]pyrene exceedances range from 2.4 mg/kg to 880
mg/kg over its PSRG of 2.1 mg/kg. Benzene in samples exceeded its PSRG of 5.4 mg/kg
at sample locations SB-36/SB-36 DUP and OS-2. Naphthalene exceeded its PSRG of 18
mg/kg at soil sample locations SB-36/SB-36 DUP, MW-13, and OS-2.
The polychlorinated biphenyl (PCB) Aroclor-1254 exceeded its PSRG of 0.91 mg/kg at
HA-26 at 2.1 mg/kg and HA-27 at 3.2 mg/kg. PCB Aroclor-1260 has a PSRG of 0.99
mg/kg, which was exceeded in post -excavation confirmatory samples HA-3 at 23 mg/kg,
HA-9B at 1.3 mg/kg, and HA-11B at 1.0 mg/kg. Samples collected near surface of
transformers indicated exceedances in PCBs at HA-26A, HA-27A, and HA-3A for the
PCB congeners 77-TeCB, 105-PeCB, 114-PeCB, 118-PeCB, 123-PeCB, 156/157-HxCB,
167-HxCB, and 189-HxCB. Most of the PCB -impacted soil that had been sampled at the
Brownfields Property was excavated by the PPD under the jurisdiction of EPA in 2021;
confirmatory soil samples indicate that PCB -impacted soil above 1 mg/kg remains in the
Tunnel Area/Encapsulated Area and is the subject of a NOTICE OF RESTRICTION
Erwin Mill/22058-18-043/09NoQ022
PURSUANT TO 40 CFR 761.61 discussed above. These locations will be noted on the
BFs survey plat.
Total petroleum hydrocarbons, diesel range organics (TPH-DRO) concentrations detected
in soil samples SP-1, SP-2, SB-1, SB-4, SB-5, SB-6, SB-7, and OS-1 exceeded the DEQ
UST Action Level of 100 mg/kg for TPH-DRO. Total xylenes concentrations exceeded
its PRSG 530 mg/kg in sample SB-36 at 640 mg/kg. Detections of soil contaminants that
did not have an established screening level were documented on the Exhibit 2 and
included in site risk calculations. All excavated soil and concrete associated with the
PCB -contaminated areas were disposed of at a TSCA-approved landfill.
Groundwater- Former Industrial Areas
Groundwater samples were analyzed across the Brownfields Property most recently in
2019. Those contaminants that exceeded their respective NC 2L Groundwater Standard
(2Ls) in the former industrial areas of the Erwin Mill site included the following: arsenic
exceeded its 2L of 10 µg/L at MW-3 (12 µg/L), MW-9 (15 µg/L), and MW-15 (130
µg/L); benzene exceeded its 2L of 1 µg/L at GP-3 and MW-15; total chromium exceeded
its 2L of 10 µg/L at MW-9 (19.4 µg/L), MW-10 (12.1 µg/L), and MW-15 (23 µg/L);
naphthalene exceeded its 2L of 6 µg/L at GP-3 (24 µg/L) and MW-3 (29 µg/L).
Detections of groundwater contaminants that did not have an established standard were
documented on the Exhibit 2 and included in site risk calculations.
Surface Water — Former Industrial Areas
Surface water sampling conducted in the stream along the Brownfield Property's
southwestern boundary most recently in 2019 indicated exceedances of the NC
Administrative Code, Subchapter 213, Rule surface water standards (NC 213).
Specifically, there were exceedances of cadmium above the NC 2B standard of 0.12 µg/L
in samples SW-2, SW-3, SW-4, SW-5, SW-6. There were also exceedances of lead
above the NC 2B standard of 0.37 µg/L in samples SW-2, SW-3, SW-4, SW-5, SW-6.
Exterior Soil Gas- Former Industrial Areas
Detections of ethanol, 4-ethyltoluene, and trichlorofluoromethane reported in exterior soil
gas samples are documented on Exhibit 2 and were included in the site risk calculations if
possible; however, these constituents do not have an established screening level.
Sub -Slab Vapor- Former Industrial Areas
Sub -slab vapor detections in the former industrial areas exceeded their respective
Industrial VISLs of 260 µg/m3 for naphthalene in SSG-4 (340 µg/m), SSG-20 (8,600
µg/m3), SSG-21 (1,600 µg/m3), and SSG-22 (270 µg/m3). Other constituents detected in
sub -slab vapor are documented on the Exhibit 2, but there is no established screening
level for the following: 1,3-dichlorobenzene, trans-1,2-dichloroethylene, ethanol, 4-
ethyltoluene, and trichlorofluoromethane.
Indoor Air -Former Industrial Areas
Indoor air sampling results indicated the exceedance of the Industrial VISL of 0.36 µg/m3
for naphthalene in samples IA-1 (1.20 µg/m3), DUP-IA (0.541 µg/m3), IA-2 (0.479
4
Erwin Mill/22058-18-043/09NoQ022
µg/rn ), IA-3 (2.3 µg/m3), and IA-5 (14 µg/m3). Other constituents detected in indoor air
samples are documented on the Exhibit 2, but there is no established screening level for
the following: ethanol, 4-ethyltoluene, trichlorofluoromethane, and trans-1,2-
dichloromethane.
PROPOSED RESIDENTIAL AREAS
Soil -Proposed Residential Areas as indicated on the Plat map
Soil samples were taken from 0-8 feet bgs. Sampling indicated exceedances of the
Residential PSRG of 0.68 mg/kg for arsenic at sample locations SB-48, SB-49, SB-50,
SB-51, SB-53, SB-54/SB-54(DUP), SB-55, SB-56, SB-57, SB-58, SB-59, SB-60, SB-61,
and SB-62. The maximum arsenic detection was 7.4 mg/kg in sample SB-50; however,
these single -digit arsenic values are consistent with typical background ranges in NC soil.
The Residential PSRG for hexavalent chromium of 0.31 mg/kg was exceeded in samples
SB-48, SB-49, SB-50, SB-51, SB-53, SB-54/SB-54(DUP), SB-55, SB-56, SB-57, SB-58,
SB-59, SB-60, SB-61, and SB-62. The maximum hexavalent chromium detection was
7.61 mg/kg at SB-56.
Groundwater- Proposed Residential Areas as indicated on the plat map
Groundwater sampling in the proposed residential areas exceeded the NC 2Ls of 1 µg/L
for benzene in sample TW-7/Dup-GW (86/88 µg/L), of 0.6 µg/L for
bromodichloromethane in sample TW-8 (0.69 µg/L), of 6 µg/L for naphthalene in sample
TW-7/Dup GW (13/11 µg/L), and the of Interim Maximum Allowable Concentration
(IMAC) of 1.0 µg/L for 1-methylnaphthalene in sample TW-7/Dup GW (1.1/1.0 µg/L).
Surface Water- Proposed Residential Areas as indicated on the plat map
Surface water was analyzed above in the former Industrial Area analysis.
Exterior Soil Gas- Proposed Residential Areas as indicated on the plat map
Exterior soil gas sampling indicates exceedances of benzene, chloroform, and
naphthalene in those areas proposed for future residential development. The Residential
VISLs in soil gas for benzene (12 µg/L) was exceeded in sample SG-10 at 13 µg/L. The
Residential VISL in soil gas for chloroform (4.1 µg/L) was exceeded in samples SG-10
(85 µg/L), SG-13 (9.3 µg/L), and SG-14 (15 µg/L). Other constituents detected in
exterior soil gas samples are documented on the Exhibit 2, but there is no established
screening level for the following: cis-1,2-dichloroethylene, ethanol, 4-ethyltoluene, and
trichlorofluoromethane.
Sub -Slab Vapor- Proposed Residential Areas as indicated on the plat map
The sub -slab vapor sampling indicates exceedances of the respective residential VISLs
for the contaminants bromoform, carbon tetrachloride, 1,2-dibromoethane, naphthalene,
and trichloroethylene. Sampling indicates exceedances of the residential VISL of 85 µg/
In for bromoform in samples SSG-30 (111 µg/ m); 16µg/ m3 for carbon tetrachloride in
sample SSG-19 (53 µg/ m3); 0.16 µg/ m3 for 1,2-dichlorobromoethane in sample SSG-34
(5.6 µg/ m3); 2.8µg/ m3 for naphthalene in samples SSG-15, SSG-31, SSG-35/SSG-DUP
5
Erwin Mill/22058-18-043/09NoQ022
Indoor Air- Proposed Residential Areas as indicated on the plat map
Indoor air sampling occurred within the existing buildings that remained onsite within the
proposed residential areas. Sampling indicates exceedances of the residential VISL of
0.36 µg/m3 for benzene in samples CS-l/DUP-CS (0.44/0.36 µg/m3) and CS-2 (0.42
µg/m3); of 0.12 µg/m3 for chloroform in sample CS-1/DUP-CS (0.16/0.13 µg/m3 ); of
0.26 µg/m3 for 1,4-dichlorobenzene in sample DUP-CS2 (1.50 µg/ m); of 15 µg/m3 for
ethyl acetate in sample CS-3 (15 µg/m3); of 42 µg/m3 for isopropanol in sample CS-3
(45.2 µg/m3); of 0.083 µg/m3 for naphthalene in samples CS-1/DUP-CS (1.9/1.8 µg/rn);
of 0.42 µg/m3 for trichloroethylene in samples CS-2 (0.42 µg/m3) and CS-3 (0.7 µg/rn).
Risk Calculations- Proposed Residential and Industrial Areas as indicated on the plat
map
Most risk calculations were performed using the December 2019, or the June 2021DEQ
Risk Calculator https:Hdeq.nc.gov/pennits-rules/risk-based-remediation/risk-evaluation-
resources. To confirm earlier calculations in the industrial and proposed residential areas,
risk calculator results for certain areas where calculated risk values were exceeded for
vapor intrusion were updated to the July 2022 version of the risk calculator. For most of
the calculations, the results were the same or similar between use of the older and the
most recent risk calculator. The confirmatory soil data in the Tunnel Area was evaluated
using the July 2022 risk calculator.
For the purposes of looking at the site spatially, the site was divided into 22 areas based
on our knowledge of sources stemming from historic operations and the distribution of
chemical data in order to assess risk within each of these areas. The risk calculations
indicated the following based on available data, including the following media:
groundwater, residual soil (based on confirmatory soil data), exterior soil gas, sub -slab
vapor, indoor air, sediment, and surface water. Risk calculator outputs that were
previously ran for PCB -impacted soil (Areas 1 through 5) are replaced in this revised
Decision Memo by the recent risk calculator output related to only the PCB -impacted soil
remaining in the Tunnel/Encapsulated Area.
6
Erwin Mill/22058-18-043/09NoQ022
Tunnel Area/Encapsulated Area - PCB -Impacted Soil Remaining
Risk for Individual Pathways
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Tunnel Area -Post PCB -I acted Soil Excavation Sa les
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazardlndex
Risk exceeded?
Resident
Soil
1.8E-04
8.5E+00
YES
_
- ---------------
Groundwater Use*
--
NC
---
NC
-
NC
Non -Residential Worker
Sol
4.4E-05
6.8E-01
NO
Groundwater Use*
NC
NC
NC
Construction Worker
Soil
5.5E-06
1.4E+00
YES
Recreator/Trespasser
Soil
9.9E_05
4.7E+00
YES
Surface Water*
NC
NC
NC
Soil impacted with PCBs in excess of 1 mg/kg are limited to those present in the Tunnel
area. These soils are covered by concrete and are identified on the plat and in EPA
related documents, which includes certain restrictions and requirements for maintenance
of the concrete cover. These restrictions are laid out in the NOTICE OF RESTRICTION
PURSUANT TO 40 CFR 761.61 that is provided in Exhibit 3 to the BFA.
7
Erwin Mill/22058-18-043/09Nov2022
Area 6- R&D Lab area & Warehouses/offices, Shipping & Receiving and Spinning
Area, Ammonia Storage/Compressor Area
Former Industrial Area
Risk for Indisidmal Pathways
Version Date: December 2019
Basis: November 2019 EPA RSL Table
Shell): 22058-18-043
ExpsureUnftlD: Area6-SB37 9;hf1i-11r12;S1:1-2;SS i�2r26�28
DIRECT CONTACT SOIL AND NVATER CALCLLAT ORS
Receptor
patkwnT
Carcinogenic
Riak
Ha=rdluder
RL%ke=Ceeded°
{15...................:8E-01............................NO
Resident
..........................................Soil...................................................9.6F
..................
GroundwatefUse*
9.1"5
15E+00
17-S
Soil
U�....................:BF
02............................NO
Non-ResidentialIVofkef
...........................................
..........:3F
GroundwaterUse*
1.3E-05
22Er01
NO
Construction W- ork-er
Soil
7.5E-07
92E-01
NO
RecreatoriTre spas s er
.......°i.................................................
........
.:3Erf15.....................�:t..........................�................
Surface Water*
SIC
SIC
NC
VAPOR INTRUSION CALCULATORS
Receptor
patk�ff3y
CarrimRiakenir
Haxardluder
Riakeseeeded:
Groundwater to Indoor Air
.......................................................................................................................................................................................................................
12E,06
5.3E-02
NO
Resident
Soil Gas to IndoorAif
......................................................................................................................................................................................................................
6.5E,06
2.1E-01
NO
Indoof=iir
NC
NC
NC
Groundwatef to Indoof Air
2.7E-0'
1.4E-02
NO
Ion -Residential workef
......................................................................................................................................................................................................................
Soil Gas to Indoor Air
.................................Indo .if......................................................................................................................................
4.9E-0'
1.,E-02
NO
Of
NC
NC
NC
As indicated by the area specific risk calculator's output, residential groundwater use
exceeds the threshold non -cancer hazard index of 1.0 for exposure risk. There are no
unacceptable exceedances for the carcinogenic risk range maximum of 1E-4.
The vapor intrusion pathways exhibit acceptable risk ranges for the threshold non -cancer
hazard index of 1.0 for exposure risk and the carcinogenic risk range maximum of lE-4.
8
Erwin Mill/22058-18-043/09NoQ022
Area 7- Spinning Area & Winding Area, Beaming Area and warping area
Former Industrial Area
[Risk for Individual Pathways
vIrsionDate: December 2019
Basis: Ncrember 2019 EPA RSL Table
Site ID: 23058-18-043
E sure Unit ID- Area 7 - Subs lab vapor & indoor air and SSG-3 4; Sib & Lei-5
DIRECT CONTACT SOIL AND %X -ITEER CALCULATORS
Receptor
path -ay
C-rind8genie
Hazaudludex
Riskexreededf
Resident..........................................5ui7........................................................�.............................��.................................�.................
GroundwaterUse*
NC
NC
NC
Soil
Non -Residential Worker
.............................................�.............................��.................................�.................
.....................................
Groundwater Use*
NC
hy�
NC
NC
Construction Worker
Soil
NC
'\C
NC
Soil
N�
Recre-atorrFrespassef
..............*...........................
............... ...............
...............�.................................�
'\C
................
Surfa-r_--e r
NC
NC
VAPOR INTRUSION C_ALCTLATORS
Receptor
Pathwray
Carrinokgeuic
Hazard Index
Risk-exceeded?Ria
Groundwater to Indo of -Air
NC
NC
NC
Resident
.......................................................................................................................................................................................................................
Soil Gas to Indoor Air
......................................................................................................................................................................................................................
IIE44
33E+00
YES
IndoorAif
1.7E-04
4.6E+00
YES
Groundwater to Indoor Air
......................................................................................................................................................................................................................
NC
NC
NC
Non -Residential Worker
Sail Gas to Indoof Aif
.................................Indoor.Ai.............................................39E
9.5E-06
2-- E� l
NO
I05....................1_lE+{10.........................1ES...............
As indicated by the area specific risk calculator's output generated using the December
2019 risk calculator, the calculated risk values for residential soil gas to indoor air and
indoor air pathways exceeds an acceptable carcinogenic risk range and the threshold
non -cancer hazard index of 1.0. Additionally, non-residential worker indoor air pathway
exceeds the threshold non -cancer hazard index of 1.0 for exposure risk. While the soil
gas to indoor air calculated output for vapor intrusion is 0.26, the risk driver for the
indoor air vapor intrusion output is naphthalene. Naphthalene is present in both the sub -
slab vapor (340 µg/m3) and in the indoor air (14 µg/m3), indicating that there is a
completed pathway in this area.
These data from Area 7 were also evaluated using the July 2022 risk calculator. For
comparison purposes, the output from those calculations was the same as the December
2021 risk calculator and is provided below:
9
Erwin Mill/22058-18-043/09Nov2022
Risk for Individual Pathways
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Area 7 - SSG-3,4,5,6 & IA-5 only
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
CarcinogenicRisk
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 __ -__
Surface Water*
jNC
NC
NC
NC
NC -----
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazardhidex
Risk exceeded?
Resident
Groundwater to Indoor Air
NC
NC
NC
Soil Gas to Indoor Air
1.2E-04
3.3E+00
YES
Indoor Air
1.7E-04
4.6E+00
YES
Non -Residential Worker
Groundwater to Indoor Air
NC
NC
NC
Sort Gas to Indoor Air
9.5E-06
2.6E-01
NO
Indoor Air
3.9F-05
1.1E+00
YES
10
Erwin Mill/22058-18-043/09Nov2022
Area 8- Shop Area
Former Industrial Area
Risk for ludidiaal Pathways
Versim Date: December 2019
Basis: November 2019 EPA RSL Table
Sire ID. 22048-15-043
E osure L-nit ID: Area 8 -Shop Area SSG-7, -8, -9, -10 , 9I-22. SI-23
DIRECT CONTACT SOIL AND MATER CALCULATORS
Receptor
Pathway
Car �euic
Hazard Index
Riahexceeded:
Resident..........................................Sod...................................................7..
...................
.tE�D2:...........................��.................
GroundwaterUse*
NC
NC
NC
7...................6.1F�03............................��.................
Non-ResidentialWorkerSoil
............................................................... ........................................5:�
GfounduaterUse*
NC
NC
NC
Construction Worker
Soil
7.4E-0&
1.OE-01
NO
3E,-06....................�-OF.02..........................
�................
Recaeator.-'Trespasser
........°�...............................................
......
Surface Water"
SIC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
PathwayCarcinokgeuic
Ria
HazardIudex
Riskexreeded?
Groundwater tolndoofAir
NC
NC
NC
Resident
.......................................................................................................................................................................................................................
Soil Gas to Indoor Air
......................................................................................................................................................................................................................
22Er05
2.0E-01
NO
IndoorAir
NC
NC
NC
Groundwater to Indo of Air
NC
NC
NC
on -Residential Worker
......................................................................................................................................................................................................................
Soil Gas to Indoof Air
..................................................................................
1.7E-06
.............................�................................�................
1.5F 02
NO
Indoorrtif
NC
As indicated by the area specific risk calculator's output, which is based on only soil and
soil gas data in this area, indicated no unacceptable carcinogenic risk and no noncancer
risk above the threshold risk ranges. Indoor air samples were not collected in this space.
11
Erwin Mill/22058-18-043/09Nov2022
Area 9- Dye Pit and Dye House
Former Industrial Area
LRisk for Individual Pathways
Output F.1
Version Date: December 2019
Basis: November 2019 EPA RSL Table
Site ID: 2205S-18-043
E sure Unit lD: Area 9-Dye area-M16 to M21; SSG-11 to SSG-14; _'%RV-2 to'IRV-5
DIRECT CONTACT SOIL ANDWATERCALCL ATORS
Receptor
Pathwroly
Carcinogenic
Risk
Hazard Index
Riakexreeded$
Resident
.........................................Soil...................................................�.:7E-05...................3.2Er0..............................NO
..................
GroundwaterUse*
7.8E-04
4.2E+01
1'ES
Soil
Non -Re sidentialWorker
........................................3.2ErU6....................-1E-02............................NO
Groundwateruse*
1.7E-04
6.7E+0D
IT-S
Construction Worker
Soil
4.8E-07
5.5E-01
NO
��..........
Re cre ator Trespasser
........°�........*....................................::
......................................................................
......
Surface Water
NC
NO
NC
VAPOR EVTRUSION CALCULATORS
Receptor
pathway
Carrinogeuir
Risk
Hazard Index
Riakexceeded'.
Groundwater to Indoor Air
.......................................................................................................................................................................................................................
LIE-05
32E-01
NO
Resident
Sod Gas to IndoorAir
......................................................................................................................................................................................................................
1.5E-05
2.9E-01
NO
Indoor _Air
NO
NC
NC
Groundwater to Indoor Air
2.6E-06
7.5E-02.
NO
Non -Re sidentialWork-ex
......................................................................................................................................................................................................................
Soil Gas to Indoor Air
...............................................................................................................�................................�................
12E-06
23E-02.
NO
Indo orAir
NO
As indicated by the area specific risk calculator's output, residential and non-residential
groundwater use exceeds an acceptable carcinogenic risk range and the threshold non -
cancer hazard index of 1.0. There are no other unacceptable risks for non -cancer hazard
index or the carcinogenic risk. Indoor air samples were not collected in this space.
12
Erwin Mill/22058-18-043/09Nov2022
Area 10- Brushing Area & Former Dye House
Former Industrial Area
IRisk for Imdisidmal Pathways Le 1 M VM M
Versiam Date: December 2019
Basis: Norember 2019 EPARSL Table
Site ID: 22858-18-043
E sure Unit ID: Area 10-Brushin arm er Dre Ho-SB-24,25; SSG-24, -25; L4-4
DIRECT CONTACT SOEL AND RATER CALCULATORS
Receptor
Pathway
Car ��enic
Hazard Iudex
Riah exceeded:
dE-01.............................N....�.................
Resident..........................................Soil...................................................1.:8F05...................3
GroundwaterUse*
NC
NC
NC
Soil
NO
Non -Re sidentialWorker
...........................................
.........l-lE-06...................45E-02
GroundwaterUse*
NC
NC
NC
Construction Worker
Soil
22E-07
5.9 01
NO
O................
Reef eatorfTrespasser
..... .°i..............................................9.8Er06....................l3E..Rl..........................
SurfaceW- ater*
NC
NC
NC
%' 4POR E TRUSIUN CALCULATORS
Receptor
Pathway
CarcinRiAo�gemic
Haaardludex
Riahe'. xceeded
Groundwater to Indoor Air
INC
NC
NC
Resident
.......................................................................................................................................................................................................................
Soil Gas to Indoor Air
......................................................................................................................................................................................................................
7.0E-06
1.3E+40
YES
Indoor-Lir
5.7E-06
1.61r01
NO
Groundwater to Indoor Air
NC
NC
NC
Ion -Residential Worker
......................................................................................................................................................................................................................
Soil Gas to Indoor },ir
.......................................................................................................................................................................................................................
52E-07
LMOI
NO
IndoorAir
I 13E-46
I 3.9E-02
I NO
As indicated by the area specific risk calculator's output the threshold non -cancer hazard
index of 1.0 for exposure risk is exceeded for the residential soil gas to indoor air
pathway, but it is not exceeded for the nonresidential soil gas to indoor air pathway.
There are no other unacceptable risks for non -cancer hazard index or the carcinogenic
risk in this area.
13
Erwin Mill/22058-18-043/09Nov2022
Area 11- Former Cotton Blending Area, Finishing, Warehouse/offices
Former Industrial Area
lRiak for Individual Pathway-s
i'eraion hate: December 2n19
Baia: November 2019 EPA RSL Table
Site ID: y'�OSS lo4ti
Exp-oaureUnit ID: Area 11-SB-40-S'B44;AfW-13;SSC-20-SSCr23g IA-1 to IA 3
DIRECT CONTACT SOIL AND W--kTER CALCULATORS
Receptor
Pathral
Carcinogeni
Hazard Index
Risk
c Risk
exceeded?
Resident.....................................Saa1.......................................................................frE
-rD3 3. SE...01....................
Groundwater Us--*
NC
.................
NC
.....................
NC
Soil
6.7E+{1'0...................3FS
Non-R tial worker
..................................�:.SF-'d4
Groundwater Use*
NC
NC
NC
comtrmtion workar
soil
5.7E-05
5.1E101
ITS
oil
S......
03..............
...
RecreatorlTrespass
..................................................................................
.
:7E ........................".................
SurfaL—__atar*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathral
Carcinogeni
Hazard Index
Risk
c Risk
exceeded?
Groundwater to Indoor Air
NC
NC
NC
R=-Udent
............................................................................................................................................................................................
Soil Gas to Indoor Air
..........................................................................................................................................................................................
3.2E-03
8.4E+41
YES
LukxnAir
3.3E-05
1_lE+{b0
YES
Groundwater to Indoor Air
NC
NC
NC
Non-ResidantiF " :. k=.
..........................................................................................................................................................................................
Soil Gas to Indoor Air
..4E-04
6_7E+00
YES
Indoor Air.....................................5.SE-06...............2._7E01......................N
..............
As indicated by the area specific risk calculator's output, residential and
recreator/trespasser soil use exceeds the carcinogenic risk range maximum of lE-4. The
threshold non -cancer hazard index of 1.0 is exceeded for residential, non-residential,
construction worker, and recreator/trespasser exposure scenarios for soil. The residential
soil gas to indoor air and indoor air vapor intrusion pathways exceeds the hazard index
threshold of 1.0 as does the non-residential soil gas to indoor air vapor intrusion pathway;
however, the calculated indoor air hazard index for non residential worker exposure does
not exceed the threshold noncancer hazard index of 1.0. Note also that the groundwater
pathway was not calculated.
Based on the calculated risk value exceedances for certain exposure pathways, the data
used for Area 11 was also entered into a July 2022 risk calculator. Also the groundwater
pathways were also computed, which were missing from the initial calculator above. The
output is provided below for comparison purposes:
14
Erwin Mill/22058-18-043/09NoQ022
Risk for Individual Pathways
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Area 11: SB-4044;MW-13;SSG-20-23; IA-I-IA-3
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carc�skenic
Hazard Index
Risk exceeded?
Resident
Soil
4.4E-03
3.8E+01
YES
Groundwater Use*
8.0E-06
1.8E+01
YES
Non -Residential Worker
Soil
5.5E-04
6.7E+00
YES
Groundwater Use*
2.1E-06
2.5E+00
YES
Construction Worker
Soil
8.1E-05
5.1E+01
YES
Recreator/Trespasser
Soil
Surface Water*
2.0E-03
9.7E+00
YES
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carciinsogenic
Ri
Hazardlndex
Risk exceeded?
Resident
Groundwater to Indoor Air
2.0E-07
5.3E-03
NO
Soil Gas to Indoor Air
3.2E-03
8.4E+01
YES
Indoor Air
3.8E-05
1.1E+00
YES
Non -Residential Worker
Groundwater to Indoor Air
4.6F,08
1.3E-03
NO
Sort Gas to Indoor Air
2.4E-04
6.7E+00
YES
Indoor Air
8.8E-06
2.7E-01
NO
Note that in the revised risk calculator for Area 11, the groundwater pathway values were
calculated and there were some differences in output. These results indicated that the
calculated risk values for carcinogenic risk is exceeded for residential, nonresidential, and
recreator/trespasses direct exposure to soil routes, and that all direct soil and groundwater
pathways exceed the threshold noncancer hazard index of 1.0.
For vapor intrusion risk, soil gas to indoor air calculations exceed an acceptable
carcinogenic risk range for residential and nonresidential exposure pathways, but the
threshold hazard index of 1.0 is only exceeded under residential exposure pathways.
Calculated indoor air values indicate only an exceedance of the threshold of 1.0 for
residential exposures, but not for nonresidential exposure scenarios. The driver for these
exceedances is naphthalene and polyaromatic hydrocarbons (PAHs). Naphthalene
concentrations in sub -slab soil gas are a high of 8,600 µg/m3 and in indoor air are 2.3
µg/m3, indicating a completed exposure pathway in this area.
15
Erwin Mill/22058-18-043/09Nov2022
Area Ila-Tarry Substance
Former Industrial Area
Risk far Individual Pathways
Version Date: December 2019
Basis: November 1319 EPA RSL Table
Site ID: 220 4 8 -18-0 d3
E sure Unit ID: Area lla -Tarry Substance only - 05-1 & 0S-2
DIRECT CONTACT SOIL XNDliATER CUCLi ATORS
Carcinogenic
Reeepiar
Pathwa?-
Riak
Hazardludes
Riskesreeded?
93E+01........................................
Resident..........................................Soi1...................................................12F..02.
..........................1'ES................
GroundwatefUse*
NC
NC
NC
Soil
Non -Residential workef
................................................................ ..............................
............ .:IErDI...................1.-1E+01..........................1E.S................
GroundwaterUse*
NC
NC
NC
Construction Worker
Soil
12E-04
L4E+02
IT-S
Soil
03..................
39E+01
1'ES
Recreator.Trespas ser
...... ......................................................
.........6:iF
Surface Water
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinaggeuic
HazardIudes
Riakesceeded?
Groundwater to Indo or Air
VC
NC
NC
Resident
.......................................................................................................................................................................................................................
Soil Gas to Indo of Air
......................................................................................................................................................................................................................
NC
NC
NC
Indoor Air
NC
NC
NC
Groundwater to Indoor Air
NC
NC
NC
Ion -Residential worker
......................................................................................................................................................................................................................
Soil Gas to Indo ofAir
..............................................................................................................
NC
..............
NC
... .. .. ....... NC ................
...........................................................
Indoor Air
N.0
NC
NC
As indicated by the area specific risk calculator's output, the calculated risk values
exceed an acceptable carcinogenic risk for direct exposure to soil in residential,
nonresidential, construction worker, and recreator/trespasser settings. The threshold non -
cancer hazard index of 1.0 for exposure risk is exceeded for residential, non-residential,
construction worker, and recreator/trespasser for soil use.
Due to the location of this material oozing from an unenclosed concrete slab, and that the
data pertain only to the substance itself, vapor intrusion calculations were not included.
16
Erwin Mill/22058-18-043/09Nov2022
Area 12- Former coal Power Plant, Coal Silos, Fuel Oil Boiler Building
Former Industrial Area
Risk for Individual Pathways
Version Date: December 2019
Basis: November 2019 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Area 12 Coal & Fuel Oil - SB-26 to SB-28; MW-14
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazard Index
Risk exceeded?
Resident
Soil
1.8E-05
1.7E-01
NO
_______
Groundwater Use*
8.2E-07
4.4E-02
NO
Non -Residential Worker
Solt
1.911-06
1.4E-02
NO
Groundwater Use*
1.9E-07
6.6E-03
NO
Construction Worker
Soil
4.013-07
2.1E-01
NO
Recreator/Trespasser
Soil
L0E-05
9.2E-02
NO
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinogenic
Hazardlndex
Risk exceeded?
Resident
Groundwater to Indoor Air
2.2E-07
2.6E-04
NO
SoR Gas to Indoor Air
Indoor Air
NC
NC
NC
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
5.1E-08
6.3E-05
NO
Soil Gas to Indoor Air
NC
NC
NC
Indoor Air
NC
NC
NC
As indicated by the area specific risk calculator's output, all the calculated risk values
indicate acceptable carcinogenic and noncancer risk. Specifically, there is no hazard risk
which exceeds 1.0 for exposure and no carcinogenic risk exceeds lE-4. Based on
groundwater data only, the calculated groundwater to indoor air vapor intrusion pathway
does not exceed an acceptable carcinogenic nor a noncancer threshold values.
17
Erwin Mill/22058-18-043/09Nov2022
Area 13- Dye Storage Area, Warehouse
Former Industrial Area
IR.is k for Individual Pathways +
Version Date: December 2019
Basis: Norember 2019 EPA RSL Table
Site ID: i2058-18-043
Exposure Unit ID: Area 13-Ore Sto,',i-areho,CST,SB-30-36,SB45-47,CS-1,SSG15-17,19
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
pathway
CA Riskenic
Hazard Index
Risk exceeded?
4-1E+40..........................1
.5................
Resident
..........................................Soi.....................................................1:4E-0d
.........................................
GfoundwaterUse*
NC
NC
NC
Soil
lion -Re sidential Worker
........................................1:7E-05...................63E-0..............................NO
GroundwaterUse*
NC
NC
NC
Construction Worker
Soil
32Er06
3AE+00
17-S
Soil..............................................53E-0..
}'ES................
Recseator.Trespasser
................ ...................12E+00........................
Surface Water*
NC
NC
NC
VAPOR Uf RUSION CALCULATORS
Receptar
patkway
Ca R 0kenic
Hazard Index
Riskexceeded7
Groundwater to Indoor F1ir
.......................................................................................................................................................................................................................
NC
NC
NC
Resident
Soil Gas to Indoor Air
......................................................................................................................................................................................................................
UE-06
85E-02
NO
Indoor -Air
2.7E-05
6.9E-01
NO
Groundwater to Indoor Air
NC
NC
NC
Ion -Residential Wofkef
......................................................................................................................................................................................................................
Soil Gas to Indoor Air
.......................................................................................................................................................................................................................
3.6E-07
6.9-03
NO
Indoof -Air
I 6.IE-W
I IM-01
I NO
As indicated by the area specific risk calculator's output, direct soil exposure for
residential scenarios exceeds both an acceptable carcinogenic risk and the threshold of
1.0 for noncancer risk, but does not for a nonresidential worker scenario. Noncancer risk
threshold of 1.0 is exceeded for construction worker and recreator/trespasser scenarios.
Based on these sub -slab vapor samples and one crawl space, the calculated risk values for
soil gas to indoor air and indoor air do not exceed unacceptable risk ranges for either
residential or nonresidential worker exposure scenarios.
18
Erwin Mill/22058-18-043/09Nov2022
Area 14- Electrical Substation
Former Industrial Area
Risk for Individual Pathways ,
Version Date: December 2019
Basis: November 2019 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Area 14 -Substation West; MW-17-MW 20; SW 6, SED-6
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carci nogenic
Risk
Hazardlndex
Risk exceeded?
Resident
Soil
9.0E_07
2.7E-02
NO
Groundwater Use*
4.1E-05
4.4E-01
NO
Non -Residential Worker
Soil
2.0E-07
2.2E-03
NO
Groundwater Use*
8.1E-06
6.4E-02
NO
Construction Worker
Soil
3.6E-08
2.8E-02
NO
Recreator/Trespasser
Soil
--------------------------------------------
Surface Water*
--5.0E-07
0.0E+00
1.4E-02
1.3E-02
NO -------
NO
VAPOR INTRUSION CALCULATORS
Receptor
Path"ay
Carciinsogenic
Ri
Hazardladex
Risk exceeded?
Resident
Groundwater to Indoor Air
0.0E+00
5.3E-07
NO
Soil Gas to Indoor Air
NC
NC
NC
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
0.0E+00
1.3E-07
NO
Soil Gas to Indoor Air
NC
NC
NC
Indoor Air
NC
NC
NC
As indicated by the area specific risk calculator's output, based on soil, surface water,
and groundwater samples collected in this area, direct contact with soil, groundwater, nor
surface water constitutes an unacceptable environmental risk due to the calculated values
for carcinogenic risk and noncancer risk.
19
Erwin Mill/22058-18-043/09Nov2022
Area 15- Reservoir & Former Chemical Storage Area
Former Industrial Area
Ms k for Indifidual Pathways �
VersianDate: December 2019
Basis: November 2019 EPARSL Table
Site II}: 220 5 8-18-0 43
E sure Unit ID: Area15-RescCSA;DI�2;SB34�15;3fii-?-ii-10;3iii-15�15;Si1
DIRECT CONTACT SOIL AND WATER C LCLZ ATORS
Receptor
Pa 111wpl -
C Riskenic
Hazard Index
Risk exreeded7
04
0
l-lE+{1D..........................1�.5................
Resident
..........................................Sod ..................................................1.:&F
. ......................................
Groundwater Use*
2-9E-03
2-5E+01
YES
Soil
02............................NO
Ion-Residential'['orlcer
...........................................
.........1.:1&0.......................8-3F
Groundwater Use*
53E
3.7E+00
YES
ConstructionW-orkef
Soil
1-4E-06
2-IE+00
YES
l-OE
8E-011'ES
Recfeator.Tfespassof
_Soil
....................................................................................................................
.....................5............................
...............................
Surface Water*
6.7E-06
1-IE-01
NO
VAPOR WMUSION CALCULATORS
Receptor
Pathua}-
Ca�¢�£
Hazard Index
Risk exreeded7
Groundwater to Indo or Air
.......................................................................................................................................................................................................................
83E-01
72E-01
NO
Resident
Soil Gas to Indoor Air
......................................................................................................................................................................................................................
NC
NC
NC
Indo or Air
NC
NC
NC
Groundwater to Indo Of Air
I-7E,07
1.7E-01
NO
Ion -Residential worker
......................................................................................................................................................................................................................
Soil Gas to Indoor Air
.................................Inds
NC
NC ...............................��................
NC
or.rlir................................................NC..............................�
As indicated by the area specific risk calculator's output using the December 2019 risk
calculator, an acceptable carcinogenic risk is exceeded for residential soil and
groundwater use, nonresidential groundwater use, and recreator/trespasser scenarios for
direct exposure to soil. Noncancer hazard index of 1.0 is exceeded for residential soil
and groundwater use, nonresidential groundwater use, and construction worker exposure
to soil. Based on only groundwater data there are no exceedances of environmental risk
with respect to vapor intrusion; however, the residential hazard index is calculated to be
0.72, which is getting close to 1.0.,
Based on the exceedances, the values from these same samples were incorporated into the
July 2022 risk calculator with similar, although slightly different results in some
instances:
20
Erwin Mill/22058-18-043/09Nov2022
Risk for Individual Pathways
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Area 15-Res&CSA; D-1&-2;SB-14,15; MW-7-MW 10;MW 15/16
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carc�skenic
Hazard Index
Risk exceeded?
Resident
Soil
1.8E_04
2.1E+00
YES
Groundwater Use*
2.9E-03
2.6E+01
YES
Non -Residential Worker
Soil
1.1E-05
1.6E-01
NO
Groundwater Use*
5.4E-04
3.9E+00
YES
Construction Worker
Soil
1.4E-06
2.1E+00
YES
Recreator/Trespasser
---------Soil
Surface Water*
1.0E-04
-----------
6.8E-06
1.1E+00
YES
1.1E-01
--
NO
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazardhidex
Risk exceeded?
Resident
Groundwater to Indoor Air
8.3E-07
7.2E-01
NO
Soil Gas to Indoor Air
NC
NC
NC
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
1.5E-07
4.2E-03
NO
Sort Gas to Indoor Air
NC
NC
NC
Indoor Air
NC
NC
NC
21
Erwin Mill/22058-18-043/09Nov2022
Area 16-Potentail Wetland and Former AST location
Area proposed for future residential use
Risk for Individnal Pathways
Version Date: December 2019
Basis: November 2019 EPA RSL Table
Site 11): 22054-18-M
Ryposure Unit lD: 4rea i(w�4 etlandsl4ST;SB 9-SB13; Ski -?-Sli -;ii -19 �Pc _li -? d
DIRECT CONTACT SOIL :AND WATER CALCULATORS
Receptor
Pathway
CarC=Riahemt
Hazardlnder
Risk exceeded'.
05....................2...:SE..0I............................NO
Resident
..........................................Soil...................................................3-6F
..................
Groundwater Use*
4_1E-05
4-.LE-01
NO
S....oioil
Non -Residential Worker
...................................................2:6Er06....................-UE..R2............................NO
Groundwater Use*
&_1E-06
6.0E-02.
NO
Construction Worker
Soil
4.1E-0J
4.4E-01
NO
13E..01..........................
�................
Recreator.-Trespasser
...... .°?�..............................................2:0&t15
Surface WWater*
1.SEr06
35E-02.
NO
VAPOR WMUSION C-ALCULATORS
Receptor
Pa thuay
C ar o-Riskgeuic
Hazard Inder
Rink ereeededT
Groundwater tolndoorAir
D.0E+00
53E-07
NO
Resident
.......................................................................................................................................................................................................................
Soil Gas to Indoor Air
......................................................................................................................................................................................................................
NC
NC
NC
Indoor Air
NC
NC
NC
Groundwater tolndoorAir
0.0E+44
13E-07
NO
Nan -Residential Worker
......................................................................................................................................................................................................................
So1.I Gas to In Air
..............................................................................
.................................ludo
NC
NG ...............................................
NG
or Air
NC
N1
As indicated by the area specific risk calculator's output, calculated risk values for
carcinogenic risk and noncancer hazard indices do not exceed acceptable environmental
risk ranges. Based on groundwater results only, vapor intrusion does not appear to be an
issue although no soil gas samples were collected in this area and no enclosed buildings
are located in this area.
22
Erwin Mill/22058-18-043/09Nov2022
Area 16a-Sediment only
Area proposed for future residential use
Risk for Individual Pathways
Version Date: December 2019
Basis: November 2019 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Area 16 - Sediment Only - SED-2 to SED-4
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazard Index
Risk exceeded?
Resident
Soil
5.6E-05
3.1E-01
NO
_______
Groundwater Use*
NC
NC
NC
Non -Residential Worker
Solt
3.3E-06
2.6E-02
NO
Groundwater Use*
NC
NC
NC
Construction Worker
Soil
4.813-07
6.1E-01
NO
Recreator/Trespasser
Soil
3.1E-05
1.7E-01
NO
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carc�skenic
Hazardlndex
Risk exceeded?
Resident
Groundwater to Indoor Air
NC
NC
NC
SoR Gas to Indoor Air
NC
NC
NC
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
NC
NC
NC
Soil Gas to Indoor Air
NC
NC
NC
Indoor Air
NC
NC
NC
As indicated by the area specific risk calculator's output, constituents in sediment
samples collected from the wetland area and stream yield calculated risk values for
carcinogenic risk and noncancer hazard indices that do not exceed acceptable
environmental risk ranges.
23
Erwin Mill/22058-18-043/09Nov2022
Area 17- Background Soil
Area proposed for future residential use
LIMA for Individual Pathways
Version Date: December 2019
Basis: November 2019 EPARSL Table
Site ID: 220-%&18-04-4
E sure Unit ID: Area 17 Back round m etals only s oil BG-1 thru BG-4
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Patkwaly
Carcinogenic
Risk
Hazardlndex
Riahexceeded7
t12............................NO
Resident
..........................................Soi1....................................................1:6Er06...................
:BF
..................
GroundwaterUse*
NC
NC
NC
Soil
Ion -Residential Worker
...........................................
........3.:TEr07...................53E-03............................NO
GroundwaterUse*
NC
NC
NC
Construction Worker
Soil
62MB
I 4.7E-02
NO
Soil
47....................
..
Recreator.Trespas ser
.................................. .......
...............................................9.OE
..........................NO................
Surface Water*
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazard Index
Rich exceeded?
GroundwateItolndoorAir
.......................................................................................................................................................................................................................
NC
NC
NC
Resident
Soil Gas to IndoorAir
......................................................................................................................................................................................................................
NC
NC
NC
Indoor -Air
NC
NC
NC
Groundwater to Indoor Air
NC
NC
NC
Non -Residential Worker
......................................................................................................................................................................................................................
Soil Gas tolndoof- Air
................................Inds
..... ........... NC
......... NC
.NC...............................NC................
NC
orf4ir.................................
NG....................
As indicated by the area specific risk calculator's output, based on the background metals
data collected from soil, the calculated risk values for carcinogenic risk and noncancer
hazard indices do not exceed acceptable environmental risk ranges.
24
Erwin Mill/22058-18-043/09Nov2022
Area 18-Parking lot and Grassy Area -Proposed Residential
Area proposed for future residential use
Risk for Individual Pathways
Version Date: June 2021
Basis: May 2021 EPA RSL Table
7
Site ID: Parking lot and Grass Area (Residential)
Exposure Unit ID: 22058-18-043
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carci nogenic
Risk
Hazardindex
Risk exceeded?
Resident
Sod
3.5E-05
2.4E-01
NO
Groundwater Use*
3.1E-05
4.2E-01
NO
Non -Residential Worker
Sod
3.5E-06
1.8E-02
NO
Groundwater Use*
7.0E-06
8.2E-02
NO
Construction Worker
Sod
2.5E-06
1.7E-01
NO
Recreator/Trespasser
_Soil
------------------ -
Surface Water*
2 _0E-05
NC
1.3E-01
NC
NO -------
NC
VAPOR INTRUSION CALCULATORS
Receptor
Path"ay
Carciinsogenic
Ri
Hazardindex
Risk exceeded?
Resident
Groundwater to Indoor Air
1.6E-06
1.5E-02
NO
Soil Gas to Indoor Air
4.0E-06
3.0E-01
NO
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
3.8E-07
3.6E-03
NO
Sod Gas to Indoor Air
2.9E-07
2.4E-02
NO
Indoor Air
NC
NC
NC
As indicated by the area specific risk calculator's output, calculated risk values for
carcinogenic risk and noncancer hazard indices do not exceed acceptable environmental
risk ranges.
25
Erwin Mill/22058-18-043/09Nov2022
Area 19- Tenant Spaces -
Area nronosed for future residential use
Risk for Individual Pathways
Version Date: June 2021
Basis: May 2021 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Area 19 Tenant Spaces (residential proposed)
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carci nogenic
Risk
Hazardlndex
Risk exceeded?
Resident
Sod
1.4E_05
1.0E-01
NO
Groundwater Use*
3.7E-04
6.7E+00
YES
Non -Residential Worker
Sod
1.4E-06
7.9E-03
NO
Groundwater Use*
9.1E-05
1.5E+00
YES
Construction Worker
Sod
9.7E-07
7.4E-02
NO
Recreator/Trespasser
_Soil
------------------ -
Surface Water*
7.6E-06
NC
5.3E-02
NC
NO -----
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazardladex
Risk exceeded?
Resident
Groundwater to Indoor Air
7.7E-05
1.2E+00
YES
Soil Gas to Indoor Air
4.4E-05
3.4E-01
NO
Indoor Air
3.5E-05
1.5E+00
YES
Non -Residential Worker
Groundwater to Indoor Air
1.8E-05
2.9E-01
NO
Sod Gas to Indoor Air
3.3E-06
2.7E-02
NO
Indoor Air
7.8E-06
3.6E-01
NO
As indicated by the area specific risk calculator's output, either the carcinogenic risk or
the hazard index of 1.0 is exceeded for direct exposure to groundwater for residential and
non-residential uses. Residential groundwater to indoor air exceeds the 1.0 threshold non -
cancer hazard index at 1.2. The residential indoor air pathway exceeds the 1.0 threshold
non -cancer hazard index at 1.5.
Due to the exceedances of risk in the central warehouses and the possibility of future
residential use, the groundwater, sub -slab vapor, soil, and crawl space samples in this
area were incorporated into the July 2022 risk calculator with the following results:
26
Erwin Mill/22058-18-043/09Nov2022
Risk for Individual Pathways
Version Date: July 2022
Basis: May 2022 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Prop Res: Central/Warehouses GW,SSG,Soil, CS samples
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carc�skenic
Hazard Index
Risk exceeded?
Resident
Sod
2.2E-05
7.9E+00
YES
Groundwater Use*
3.9E-04
7.0E+00
YES
Non -Residential Worker
Sod
2.0E-06
5.6E-01
NO
Groundwater Use*
9.5E-05
1.6E+00
YES
Construction Worker
Sod
1.4E-06
1.8E+00
YES
Recreator/Trespasser
Sod
Surface Water*
1.2E-05
4.4E+00
YES
NC
NC
NC
VAPOR INTRUSION CALCULATORS
Receptor
Pathway
Carcinogenic
Risk
Hazardhidex
Risk exceeded?
Resident
Groundwater to Indoor Air
8.1E-05
1.2E+00
YES
Sod Gas to Indoor Air
7.1E-06
3.0E-01
NO
Indoor Air
3.5E-05
1.5E+00
YES
Non -Residential Worker
Groundwater to Indoor Air
6.5E-07
1.8E-02
NO
Sod Gas to Indoor Air
3.7F,07
5.0E-03
NO
Indoor Air
7.8E-06
3.6E-01
NO
These results differ in the residential and nonresidential direct soil and groundwater use
calculations, but not for the vapor intrusion results. Trichloroethylene (TCE) is detected
in sub -slab vapor gas at 14 ug/m3 and contributes the most to the hazard index
calculation. Indoor air concentrations obtained from crawl space samples of naphthalene
and TCE contribute the most to the hazard index calculation in indoor air. Both
compounds are found in both environmental media, so a completed exposure pathway is
indicated even if the nonresidential hazard indices are below the threshold value of 1.0.
Because these warehouse areas are located within the proposed residential area and they
exceed residential vapor intrusion risk values for indoor air, the uses in these spaces
should not include children unless mitigated or additional assessment data indicate the
risk has been resolved. Naphthalene drives the risk in indoor air, but TCE is also a
contributor to the risk.
27
Erwin Mill/22058-18-043/09Nov2022
Area 20- Wetland and Southern Parking Lot
Area proposed for future residential use
Risk for Individual Pathways
Version Date: June 2021
Basis: May 2021 EPA RSL Table
Site ID: 22058-18-043
Exposure Unit ID: Wetland & Southern Parking Lot
DIRECT CONTACT SOIL AND WATER CALCULATORS
Receptor
Pathway
Carci nogenic
Risk
Hazardlndex
Risk exceeded?
Resident
Sod
2.4E_05
3.3E-01
NO
Groundwater Use*
5.9E-05
5.9E-01
NO
Non -Residential Worker
Sod
3.1E-06
3.8E-02
NO
Groundwater Use*
1.3E-05
1.0E-01
NO
Construction Worker
Sod
1.3E-06
3.1E-01
NO
Recreator/Trespasser
_Sod _
------------------ -
Surface Water*
1.3E-05
NC
1.4E-01
-
NC
NO -------
NC
VAPOR INTRUSION CALCULATORS
Receptor
Path"ay
Carciinsogenic
Ri
Hazardladex
Risk exceeded?
Resident
Groundwater to Indoor Air
3.4E-06
9.6E-03
NO
Soil Gas to Indoor Air
1.3E-05
4.0E-01
NO
Indoor Air
NC
NC
NC
Non -Residential Worker
Groundwater to Indoor Air
7.8E-07
2.3E-03
NO
Sod Gas to Indoor Air
1.0E-06
3.2E-02
NO
Indoor Air
NC
NC
NC
As indicated by the area specific risk calculator's output, all constituents show acceptable
carcinogenic risk and hazard index results. Specifically, there is no hazard risk which
exceeds 1.0 for exposure and no carcinogenic risk exceeds 1 E-4.
Required Land Use Restrictions:
The BFA, including the land use restrictions (LURs) have been revised from the original
RFR BFA to one that reflects the PD information and redevelopment. Certain restrictions
as to the use of residential at the property are incorporated as in the requirements for
certain work to be performed related to the risk from the asbestos -containing debris that
was dumped in the reservoir by the PPD.
The LURs include the standard land use definitions, requirement for an EMP and
redevelopment reporting, prohibition on groundwater use and soil disturbance, soil
import/export without DEQ approval, known contaminants, access, notification, vapor
intrusion, and annual land use restriction update (LURU). They also include by reference
the NOTICE that EPA required the recordation of based on residual PCB -impacted soil
after excavation efforts at the property conducted under the jurisdiction of EPA resulted
in the inability to remove certain soil containing PCBs above 1 mg/kg in the Tunnel
Area/Encapsulated Area.
Based on the site -specific data provided to the Brownfield program, the planned site
reuse will be made suitable for the site as long as the agreed upon land use restrictions in
the BFA are abided by.
28
Erwin Mill/22058-18-043/09Nov2022
PROPERTY MANAGEMENT ISSUES:
PD is not planning residential use at the site and is not planning on installing HVAC
systems. There are certain areas at the site in the western building that require pre-
occupancy sampling to confirm whether there are VI issues based on the risk
calculations. See hand drawn sketch below of information shared with the PD. Note that
the encapsulated area is actually located farther to the south — see plat.
LEGEND
+ a � GxGccdS /I4 ,plc--P�+tZc�. �T�Jar�y
+-�o.V��t�.MeXlu�dwy. m+�lEtrMp-x �.m
h@la�nwv/.Anl2Ra�lA%'[ AN®0.'
[GN£I�ua`
e.rmw
]F eRowNFIE�pS
LER//
We expect a work plan to address the asbestos -containing material in the reservoir from
Hart & Hickman, who have been retained to prepare such a plan on behalf of the PD.
29
Erwin Mill/22058-18-043/09NoQ022