WI0700534_Notification of Intent (NOI) – GW Remediation_20221027

October 20, 2022
North Carolina Department of Environmental Quality
Division of Water Resources — UIC Program
1636 Mail Service Center
Raleigh, North Carolina 27699
wood.
Wood Environment & Infrastructure Solutions, Inc.
2801 Yorkmont Road, Suite 100
Charlotte, North Carolina 28208
Licensures: NC Engineering F-1253, Geology C-247
T: 704-357-8600
www.woodplc.com
Subject: Notification of Intent (NOI) to Operate Injection Wells for Pilot Testing
DuPont-Kentec Facility
4610 Braxton Road
Grifton, North Carolina 28530
NCDEQ IHSB ID: NONCD0002818
Wood Project 6228-18-0478
Dear UIC Program:
Wood Environment & Infrastructure Solutions, Inc. (Wood) on behalf of Unifi Kentec, LLC. (Unifi) is pleased
to submit the attached Notification of Intent (NOI) to Operate Injection Wells for a pilot test at the above -
referenced site.
We appreciate your time in the review of this data and are available at your convenience to discuss the
contents of this submittal. You may contact the undersigned below at [e-mail] to
further discuss the site.
Sincerely,
Wood Environment & Infrastructure Solutions, Inc.
Nick Hotzelt, PE
w� C5lift
Helen P. Corley, LG, BCES
Environmental Engineer Principal Hydrogeologist
Enclosures
cc: Ben Sirmons, Unifi
Wood' is a trading name for John Wood Group PLC and its subsidiaries

NC Department of Environmental Quality — Division of Water Resources (DWR)
NOTIFICATION OF INTENT (NOI) TO CONSTRUCT OR OPERATE INJECTION WELLS
The following are `permitted by rule" and do not require an individual permit when constructed in accordance
with the rules of 15A NCAC 02C.0200 (NOTE: This form must be received at least 14 DAYS prior to injection)
AQUIFER TEST WELLS (15A NCAC 02C .0220)
These wells are used to inject uncontaminated fluid into an aquifer to determine aquifer hydraulic characteristics.
IN SITU REMEDIATION (15A NCAC 02C .0225) or TRACER WELLS (15A NCAC 02C .0229):
1) Passive Injection Systems - In -well delivery systems to diffuse injectants into the subsurface. Examples include
ORC socks, iSOC systems, and other gas infusion methods (Note: Injection Event Records (IER) do not need to be
submitted for replacement of each sock used in ORC systems).
2) Small -Scale Injection Operations — Injection wells located within a land surface area not to exceed 10,000
square feet for the purpose of soil or groundwater remediation or tracer tests. An individual permit shall be required
for test or treatment areas exceeding 10,000 square feet.
3) Pilot Tests - Preliminary studies conducted for the purpose of evaluating the technical feasibility of a
remediation strategy in order to develop a full scale remediation plan for future implementation, and where the
surface area of the injection zone wells is located within an area that does not exceed five percent of the land surface
above the known extent of groundwater contamination. An individual permit shall be required to conduct more
than one pilot test on any separate groundwater contaminant plume.
4) Air Injection Wells - Used to inject ambient air to enhance in -situ treatment of soil or groundwater.
5) In -Situ Thermal Wells (IST) — Used to `heat' contaminated groundwater to enhance remediation.
Print Clearly or Type Information. Illegible Submittals Will Be Returned as Incomplete.
DATE: October 20, 2022
PERMIT NO. (to be filled in by DWR)
NOTE- If this NOI is being submitted as notification of a modification of a previously issued NOI for this site (e.g.,
different injection wells, plume, additives, etc.) and still meets the deemed permitted by rule criteria, provide the
previously assigned permit tracking number and any needed relevant information to assess and approve injection:
A.
B.
Permit No. WI Issued Date:
WELL TYPE TO BE CONSTRUCTED OR OPERATED
(1) Air Injection Well Complete sections B through F, J, M
(2) Aquifer Test Well . Complete sections B through F, J, M
(3) Passive Injection System Complete sections B through F, H-M
(4) Small -Scale Injection Operation Complete sections B through M
(5) X Pilot Test Complete sections B through M
(6) Tracer Injection Well Complete sections B through M
(7) In -Situ Thermal (IST) Well Complete sections B through M
STATUS OF WELL OWNER: Business/Organization
Deemed Permitted GW Remediation NOI Rev. 2-17-2020
Page 1

C. WELL OWNERS) — State name of Business/Agency, and Name and Title of person delegated authority to
sign on behalf of the business or agency: 'l
Name(s): Unifi Kinston, LLC / Mr. Ben Simons, Assistant Secretary & Deputy General Counsel
Mailing Address: 7201 West Friendly Avenue
City: Greensboro State: NC Zip Code: 27410 County: Guilford
Day Tele No.: 336-294-4410 Ce11 No.:
EMAIL Address: [e-mail] Fax No.: 336-316-5205
D. PROPERTY OWNER(S) (if different than well owner/applicant)
Name and Title: Matthew Williams
Company Name
Mailing Address: 4649 Braxton Road
City: Grifton State: NC Zip Code: 28530 County: Lenoir
Day Tele No.: Cell No.:
EMAIL Address: Fax No.:
E. PROJECT CONTACT (Typically Environmental Consulting/Engineering Firm)
Name and Title: Nick Hotzelt, PE Environmental Engineer
Company Name Wood Environment & Infrastructure Solutions
Mailing Address: 2801 Yorkmont Road, Ste 100
City: Charlotte State: NC Zip Code: 28208 County: Mecklenburg
Day Tele No.: 704-357-8600 Cell No.:
EMAIL Address: [e-mail] Fax No.:
F. PHYSICAL LOCATION OF WELL SITE
(1) Facility Name & Address: DuPont-Kentec Facility
4610 Braxton Road
City: Griffon County: Lenoir Zip Code: 28530
(2) Geographic Coordinates: Latitude**: 35 ° 20 ' 35.0 " N or °.
Longitude**: 77 ° 27 ' 57.1 " W or °.
Reference Datum: Center of site parcel Accuracy:
Method of Collection: Google Earth
**FOR AIR INJECTION AND AQUIFER TEST WELLS ONLY: A FACILITY SITE MAP WITH PROPERTY
BOUNDARIES MAY BE SUBMITTED IN LIEU OF GEOGRAPHIC COORDINATES.
G. TREATMENT AREA
Land surface area of contaminant plume: 249,150 square feet
Land surface area of inj. well network: 5,000 square feet (< 10,000 ft2 for small-scale injections)
Percent of contaminant plume area to be treated: 2 (must be < 5% of plume for pilot test injections)
Deemed Permitted GW Remediation NOI Rev. 2-17-2020 Page 2

H. INJECTION ZONE MAPS — Attach the following to the notification.
(1) Contaminant plume map(s) with isoconcentration lines that show the horizontal extent of the
contaminant plume in soil and groundwater, existing and proposed monitoring wells, and existing and
proposed injection wells; and
(2) Cross-section(s) to the known or projected depth of contamination that show the horizontal and
vertical extent of the contaminant plume in soil and groundwater, changes in lithology, existing and
proposed monitoring wells, and existing and proposed injection wells.
(3) Potentiometric surface map(s) indicating the rate and direction of groundwater movement, plus
existing and proposed wells.
I. DESCRIPTION OF PROPOSED INJECTION ACTIVITIES AT THE SITE — Provide a brief narrative
regarding the cause of the contamination, and purpose, scope, goals of the proposed injection activity:
The 14.3-acre Site consists of the former DuPont-Kentec facility, which was formerly occupied by a
manufacturing plant used for cleaning metal parts. Buildings have since been demolished and the property is
currently vacant, with remaining concrete pads at the former building locations. Assessment activities
concluded there were no constituents of concern (COC) in soil identified to be remaining on -Site at
concentrations above the IHSB Health -Based Remediation Goals, nor the IHSB Protection of Groundwater
Remediation Goals. One COC is identified in groundwater that exceeds remedial goals; 1,4-dioxane. This
compound was reportedly used in the parts cleaning process. Wood proposes to implement an in -situ chemical
oxidation (ISCO) pilot study in the potential source area (MW-4A) and in the vicinity of the highest
concentration detected in groundwater (MW-19). ISCO is a proven technology capable of treating 1,4-dioxane.
Sodium persulfate with FeEDTA activation was selected as the ISCO injectant for the area near MW-4A and
hydrogen peroxide and sodium citrate for the area near MW-19 based on aquifer and site -specific parameters
as well as a laboratory scale bench test completed previous. The injection will be performed by Redox Tech
out of Cary, NC under the supervision of Wood.
J. WELL CONSTRUCTION DATA
(1) No. of injection wells: 6 Proposed Existing (provide NC Well
Construction Record (GW-1) for each well)
(2) Appx. injection depths (BLS): 20 ft
(3) For Proposed wells or Existing wells not having GW-1 s, provide well construction details for each
injection well in a diagram or table format. A single diagram or line in a table can be used for
multiple wells with the same construction details. Well construction details shall include the
following (indicate if construction is proposed or as -built):
(a) Well type as permanent, Geoprobe/DPT, or subsurface distribution infiltration gallery
(b) Depth below land surface of casing, each grout type and depth, screen, and sand pack
(c) Well contractor name and certification number
K. INJECTION SUMMARY
Deemed Permitted GW Remediation NOI Rev. 2-17-2020 Page 3

NOTE Only irniectarzts approved by the epidentioloQy section of the NC Division of Public Health,
Department of Health and Human Services can be injected. Approved injectants can be found online at
http: //deq.nc. gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/ground-water-
protection/ground-water-approved-injectants. All other substances must be reviewed by the DHHS prior to
use. Contact the UIC Pro ream for more info if you wish to get approval for a different additive. However
please note it may take 3 months or longer. If no injectants are to be used use N/A.
Injectant: —20 wt% Sodium persulfate Total Amt. to be injected (gal)/event: —1452 gal
Injectant: 25 wt% Sodium hydroxide Total Amt. to be injected (gal)/event: —48 gal
Injectant: Iron Ethylenediaminetetraacetic Acid IFe(EDTA)1 Total Amt. to be injected (gal)/event: ^•0.25 gal
Injectant: — 3 wt% Hydrogen peroxide Total Amt. to be injected (gal)/event:—1499ga1
Injectant: Sodium citrate Total Amt. to be injected (gal)/event: —0.25 gal
Injectant: Total Amt. to be injected (gal)/event:
Total Amt. to be injected (gal/event): 3,000
No. of separate injection events: 1 Total Amt. to be injected (gal): 3,000
Source of Water (if applicable): municipal fire hydrant along Braxton Road
L. MONITORING PLAN — Describe below or in separate attachment a monitoring plan to be used to deterrnine
if violations of groundwater quality standards specified in Subchapter 02L result from the injection activity.
Performance monitoring will be conducted to evaluate the effectiveness of the injection near the source area
and near the area of highest concentration. Closely prior to injection activities, a sampling event will be
conducted to establish baseline conditions at the site. Following injection, performance monitoring events will
be conducted approximately 1 month, 3 month, 6 months, and 12 months following substrate injection to
evaluate treatment progress at the site. For performance monitoring, Wood personnel will sample monitoring
wells MW-2, MW-3, MW-4A, MW-4B, MW-5, MW-19, and MW-20. Groundwater samples will be analyzed
for 1,4-dioxane by EPA Method 8260 SIM, nitrate and sulfate by EPA Method 300.0, and select metals (As,
Ba, Cd, Cr, Se, and Pb) plus total and dissolved iron by EPA Method 6020. Additionally, two surface water
samples will be collected during the baseline, 6-month, and 12-month performance monitoring events. Surface
water samples will be collected from two surface water locations, SW-9 and SW-29. The surface water
samples will be analyzed for 1,4-dioxane by EPA Method 8260 SIM.
M. SIGNATURE OF APPLICANT AND PROPERTY OWNER
Well Owner/Applicant: `I hereby cert, under penalty of law, that I am familiar with the information
submitted in this document and all attachments thereto and that, based on my inquiry of those individuals
immediately responsible for obtaining said information, I believe that the information is true, accurate and
complete. I am aware that there are significant penalties, including the possibility of fines and imprisonment,
for submitting false information. I agree to construct, operate, maintain, repair, and if applicable, abandon
the injection well and all ,elated appurtenances in accordance with the 15A NCAC /02C 0200 Rules."
13CA.///l.L ClAAID/Us, -,
Print or Type Full Name and Title
Signature of Applicant
Deemed Permitted GW Remediation NOI Rev. 2-17-2020
p/1 e7"/, i%b�Y%i Page 4
Cfmo2eAI4t'd /5

Property Owner (if the property is not owned by the Well Owner/Applicant):
"As owner of the property on which the injection well(s) are to be constructed and operated, I hereby consent to
allow the applicant to construct each injection well as outlined in this application and agree that it shall be the
responsibility of the applicant to ensure that the injection well(s) conform to the Well Construction Standards
(15A NCAC 02C . 0200). "
"Owner" means any person who holds the fee or other property rights in the well being constructed. A well
is real property and its construction on land shall be deemed to vest ownership in the land owner, in the
absence of contrary agreement in writing.
Vie"- ✓ 1 o
Signature* of Property Owner (if different from applicant) or Type Full Name and Title
*An access agreement between the applicant and property owner may be submitted in7ieu of a signature on this form.
Please send 1 (one) hard color copy of this NOI along with a copy on an attached CD or Flash Drive at least
two (2) weeks prior to injection to:
DWR — UIC Program
1636 Mail Service Center
Raleigh, NC 27699-1636
Telephone: [phone]
Deemed Permitted GW Remediation NOI Rev. 2-17-2020 Page 5

Injection Well Type
Injection
Well ID
Total Depth
(ft bgs)
Injection Screened
Interval (ft bgs)
Temporary
Geoprobe/DPT
Injections
I W 1-1
16
6-16
I W 1-2
16
6-16
I W 1-3
16
6-16
IW2-1
21
11-21
IW2-2
21
11-21
IW2-3
21
11-21
ft bgs = feet below ground surface
DPT = direct -push technology
Injection points will be properly abandoned following injection.
Injections to be performed by Redox Tech of Cary, NC.

Document Path: P:\6228 Environmental\jobs\2018\6228-18-0478 Unifi Kinston LLC\GIS\Figures\ProposedLocations.mxd
Property Boundary
Parcels
Legend
Approximate Location of Monitoring Well
Approximate Location of Surface Water Sample
A Stream Gauge Location
- Beaver Dam Branch
--- Tributary (Adapted from drawings by others)
*Reference: Groundwater/Surface Water Sample Location Map dated 8/3/2015 by Parsons
C Proposed Injection Location
_Si. Proposed Monitoring Well
Location
wood.
PREPARED BY: LMM
CHECKED BY: HPC
HUGHESG'3�7E
4558-72-9621 -
DATE: 9/14/2022
DATE: 9/14/2022
45r 5 _1491
Proposed Monitoring Well and
Pilot Injection Locations
Former DuPont Kentec Facility
4510 Braxton Road
Grifton, North Carolina
PROJECT NO.:
FIGURE NO.:
6228-18-0478
2

Document Path: P:\6228 Environmental\jobs\2018\6228-18-0478 Unifi Kinston LLC\GIS\GIS\wbm_11.21\Isol4dioxOct21.mxd
0 75 150
300
Feet
MW-7B
T(2.0)
MW-7A
(12.6)
MW-3
(231)
M W-1
hMW-5/
MW-2 \ 4 (6.3)y
(NS)
`(271
v) ►
`MW-4B
'(<2.0) •
MW-16
4/(<2.0)
Property Boundary
Parcels
Legend
Samples collected October 19, 2021
(2.1) Concentrations shown in pg/L
(3.6) Bold values exceeded NC 2L Standard
9 Approximate Location of Monitoring Well
Monitoring Well not used in contouring
A Approximate Location of Surface Water Sample
Stream Gauge Location
Beaver Dam Branch
----Tributary (Adapted from drawings by others) u 3
^'3
'Reference: Groundwater/Surface Water Sample Location Map dated 8/3/2015 by Parsons
Stream Flow Direction
(NS) Not Sampled
< Not Detected above
the Reporting Limit
J Estimated concentration
1,4-Dioxane Isoconcentration Lines
>3 pg/L (NC 2L Standard)
>30 pg/L
>60 pg/L
wood.
PREPARED BY: LMM
DATE: 1/31/2022
CHECKED BY: HPC DATE: 1/31/2022
1,4-DIOXANE IN SHALLOW
GROUNDWATER
AND SURFACE WATER
(OCTOBER 2021)
Former DuPont Kentec Facility
4510 Braxton Road
Grifton, North Carolina
PROJECT NO.: 6228-18-0478
FIGURE NO.:
7

11.21 \Contou rO ct2ft 1. mxd
Document Path: P:\6228 Environmental\iobs\2018\6228-18-0478 Unifi Kinston LLC\GIS\GIS\wbm
Property Boundary
Parcels
Legend
Approximate Location of Monitoring Well
A Approximate Location of Surface Water Sample
A Stream Gauge Location
Beaver Dam Branch
Tributary (Adapted from drawings by others)
Stream Flow Direction
Groundwater Elevation Contour
Contour lnterval is 2'
(ft above Mean Sea Level)
(dashed where inferred)
(22.66) Groundwater Elevation (feet)
Interpreted Groundwater
Flow Direction
Monitoring well not used to
make groundwater contours
wood.
PREPARED BY: WBM
CHECKED BY: HPC
DATE: 1/12/2022
DATE: 1/12/2022
WATER TABLE MAP
(OCTOBER 19, 2021)
Former DuPont Kentec Facility
4510 Braxton Road
Grifton, North Carolina
PROJECT NO.:
FIGURE NO.:
6228-18-0478
4

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Figure 2-2 -
LOCATION OF GEOLOGIC
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Du Pont Kentec Facility_

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Figure 2.3
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