NC0003760_Report_20210407

4 OupoNT DuPont Kinston Plant
' 4693 Hwy. 11 North
Grifton,NC 28530
March 30,2021
CERTIFIED MAIL: 70162710000009589777
RETURN RECEIPT REQUESTED RECEIVED
NC Division of Water Resources i -K 0 7 2021
NPDES Complex Permitting Unit
1617 Mail Service Center NCDEQ/DWRINPDES
Raleigh,NC 27699-1617
Re: Permit No.NC0003760: A. (13) Schedule of Compliance Total Copper, Total Lead, Total Silver,
and Total Zinc Outfalls 002 & 003 Year 4 Summary Report& CAP.
The following compliance activities were addressed during the fourth year of the 5-year compliance
schedule.
a) Outfall 002 is listed as an intermittent stream by Army Corp of Engineers which would subject
the proposed bioswale to 401/404 permitting. The site will table bio-swale project and pursue
other treatment options for Outfall 002. Design on bio-swale complete.
b) Additional Sampling and further study needed to select a filtration/catch basin type system for
Outfall 002 on-site.
c) Discussing equipment and structure needed to establish a new sample point at Outfall 003 is
ongoing.
d) Attached updated Corrective Action Plan (CAP)
As the site closes out year four of the five-year compliance schedule, we will be selecting a BMP
suitable for Outfall 002 and update CAP as items are added and complete.
If you have any questions,please contact Jon Carpenter, Environmental Manager at 252-559-7024
Sincerely,
borg Xenakis
Plant Manager
DuPont Kinston Plant
DuPont Industrial Biosciences USA,LLC Page 1 of 1

4 OUPONT:- 4693 Hwy 11 N
NPDES Permit No. NC0003760 Grifton, NC 28530
DuPont Industrial Biosciences USA, LLC April 1, 2019
(last update March 26, 2021)
STORMWATER CORRECTIVE ACTION PLAN (CAP)
This Stormwater Corrective Action Plan (Table 1) has been developed in conjunction with A. (13)
Schedule of Compliance Total Copper, Total Lead, Total Silver, and Total Zinc for Outfalls 002& 003 to
address compliance with the new lower limits for metals copper, lead, silver, and zinc for the two
(Outfalls 002 &003) combined process/stormwater discharges at DuPont—Kinston Facility, National
Pollutant Discharge Elimination System Permit No. NC0003760.The schedule included in this Plan
provides a means for NCDEQ to assess the progress being made on each milestone.
Table 1:Overall Schedule
TASK MILESTONES COMPLETION DATES NCDEQ ACTION
Phase 1 (Year 1 &2)
Review new permit May 2017 Issued NPDES permit
limits and effective on April 1,
requirements and 2017
develop the CAP
Review and update, as Audit Tradewaste Lab July 2017
needed,the sampling procedures and sample
techniques used by methods
ORC.
Confirm with outside, Confirmed December 2017
certified lab on their Environment 1,
sample handling Incorporated is
techniques certified to handle all
our stormwater
sampling requirements
Verify Smoking Policy Confirmed site policy is March 2018
for DuPont at the written in the Sorona
Kinston Site Safety Manual, Section
2, Item 200, Rule#2
Select additional Collect samples near May 2017
sampling locations buildings and process
above the actual and compile the
monitoring point for additional data
outfalls 002 &003
Submit summary Summarize year 1 April 1, 2018 Certified Mail signed
report to Div. of Water schedule of compliance return receipt for the
Resources A. (13.) summary letter.
(March 27, 2018)
Sampling events March 2019 April 1, 2018
throughout year 1 and
year 2
Page 1 of 5

4
DUPONT 1_
U�O� 4693 Hwy 11 N
NPDES Permit No. NC0003760 Grifton, NC 28530
TASK MILESTONES COMPLETION DATE NCDEQ ACTION
Summarize findings Provide summary with April 2019
and conditions letter and CAP to Div.
contributing metals to of Water Resources
outfalls 002 &003
Confirm cooling chilled, ChemTreat SDS: No January 2019
and Boiler water metals listed in any of
treatment chemicals the treatment
don't contain metals chemicals
Research possible Based on data, select March 2019
BMPs BMP(s)to improve
water quality
Meet with Kinston site Staff meeting March March 26, 2019
Leadership to present 26, 2019 led by Plant
data and Manager
recommendations for
improvements
Submit summary Certified mail cover April 1, 2019 Certified Mail signed
report(with CAP)to letter and CAP return receipt for the
Div. of Water according to A. (13.) summary letter. (April
Resources Year 2 4, 2019)
Phase 2(Year 3 &4)
Pending approval of Receive CAP approval
Corrective Action Plan from Div.of Water
(CAP)from NCDEQ, Div. Resources
of Water Resources
Clean out any Complete basin Contracted with MPW
sentiment found in the cleanout project by End to clean out catch
stormwater catch of Summer 2019 basins along 002 and
basins along the flow of 003. (completed on
outfalls 002 &003 10/14/19 and
10/15/19) Cost$6,972
Consult with Supplier Seek supplier data on
and test for impact of impact of water
water treatment treatment chemicals
chemicals on the and sample treated
infrastructure water for metals
Continue sampling Sample during the fall
Outfalls 002 &003 of 2019 above the
above sample location monitoring point for
after cleaning out of each outfall
stormwater catch
basins
Page 2 of 5

4 DUPONT► 4693 Hwy 11 N
NPDES Permit No. NC0003760 Grifton, NC 28530
Request Engineering to Receive engineered 1/6/20—planning bid Request Engineering to
design Bio Swale BMP plan to construct Bio process walk through design Bio-Swale BMP for
for Outfall 002 (see Swale BMP scope of work. Bid Outfall 002(see Figure 1.)
Figure 1.) award to Dewberry Design Complete, March
Engineering on 212
3/31/2020
Determine applicability Note: NCDEQ Div. of Note: NCDEQ Div. of
of Neuse Buffer Rules Water Resources Water Resources
to bioswale project checked "Not Subject" checked "Not Subject"
area dated August 17, 2020 dated August 17, 2020
Determination of November 3, 2020
stream classification Letter received.
Army Corps of
Engineers and impact
to permitting
requirements for
bioswale project area
Table Bio Swale due to November 3, 2020
stream determination Letter received from
made by the Army USACE.
Corps of Engineers
TASK MILESTONES COMPLETION DATE NCDEQ ACTION
Develop SOC for new SOC Complete 2/12/2020
monitoring point for
Outfall 003 (see Figure 2.)
Develop Scope of Work Scope of Work Pending approval to
to establish new complete relocate sample point.
monitoring point for
Outfall 003
Seek Funding to move Funding approved for
monitoring point to new monitoring point
new location at Outfall for Outfall 003
003
Select Contractor& PO issued to contactor Requested PO on
Request Purchase to construct new 4/8/2020 for Dewberry
Order(PO)to construct monitoring location for to survey and design.
the new monitoring Outfall 003 Cost$17,100.00
point on Outfall 003 Capital Project ID
9211000301
(3/25/2020)Survey
Complete 5/26/2020
Submit summary Summarize year 3 Letter sent 4/13/2020 Certified Mail signed
report to Div. of Water schedule of compliance Return rec return receipt for the
Resources A. (13.)
Page 3 of 5

DUPONT► 4693 Hwy 11N
NPDES Permit No. NC0003760 Grifton, NC 28530
summary letter. (April
15, 2020)
Construct Bio-Swale Complete Construction Capital Project ID
BMP at Outfall 002 Project 9211000301
(3/25/2020)
Install new Monitoring Complete Installation
Point at Outfall 003 Project
Submit summary Summarize year 4 Due by April 1, 2021
report to Div. of Water schedule of compliance
Resources A. (13.)
Phase 3(Year 5)
Review Filter/Catch Select location and
Basin Options determine
flows/capacity
Contracted with Renew Permit for
Dewberry, 2610 Wycliff NPDES and new Permit
Road, Suite 410 for Stormwater
Raleigh, NC 27607 (Applications)
Prepare separate Submittal of NPDES Due no later than
NPDES Permit Permit application September 30, 2021
application (180 days prior to
expiring)
Prepare separate Submittal of Due no later than
Stormwater Permit Stormwater Permit September 30, 2021
application application (180 days prior to
expiring)
NPDES Permit review Receive approval of TBD(Permit expires at Pending issuance of
and approval by NC new NPDES Permit midnight March 31, new NPDES Permit
Div. of Water 2022)
Resources- NPDES
Stormwater Permit Receive approval of TBD(Permit expires at Pending issuance of
review and approval by new Stormwater midnight March 31, new Stormwater
DEMLR Stormwater Permit 2022) permit
Submit summary Summarize year 5 Due by April 1, 2022
report to Div. of Water ! schedule of compliance
Resources A.(13.)
Page 4 of 5

4OUPON11 4693 Hwy 11N
NPDES Permit No. NC0003760 Grifton, NC 28530
Figure 1: Proposed BMP: Bio-Swale—Tabled Proposal
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Figure 2: Proposed site for new sampling location.
; Proposed New Sampling
Location „►
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Outfall 003 Sampling
Location Google
Page 5 of 5