20190752 Ver 4_Public Notice_20200901

EM
US Army Corps PUBLIC NOTICE
Of Engineers
Wilmington District
Issue Date: September 1, 2020
Comment Deadline: September 15, 2020
Corps Action ID Number: SAW-2019-00206
The Wilmington District, Corps of Engineers (Corps) received an application from The
Chemours Company, LLC seeking Department of the Army authorization to permanently
impact 0.16-acre of wetlands and 120 linear feet of stream channel associated with a
flow -through cell in -stream water treatment pilot study in Bladen County, North
Carolina.
Specific plans and location information are described below and shown on the attached
plans. This Public Notice and all attached plans are also available on the Wilmington
District Website at:
https://www.saw.usace.army.mil/Missions/Re u�ry-Permit-Program/Public-Notices/
Applicant: The Chemours Company LLC, Christel Compton
22828 NC Highway 87 West
Fayetteville, North Carolina 28306
[phone]
Agent: Parsons, Luke Eggering
530 Maryville Centre Drive, Suite 400
St. Louis, Missouri 63141
[phone]
Authority
The Corps evaluates this application and decides whether to issue, conditionally issue, or
deny the proposed work pursuant to applicable procedures of the following Statutory
Authorities:
® Section 404 of the Clean Water Act (33 U.S.C. 1344)
❑ Section 10 of the Rivers and Harbors Act of 1899 (33 U.S.C. 403)
❑ Section 103 of the Marine Protection, Research and Sanctuaries Act of 1972
(33 U.S.C. 1413)
Version 6.15.2017 Page 1

Location
Location Description: From Wilmington, North Carolina (NC), take US 17 S/ US 421 N
for approximately 17 miles to Exit 270 toward Riegelwood/Elizabethtown. Continue on
NC Highway 87 for 53.39 miles. Make a sharp right onto Glengerry Hill Road and travel
approximately 0.5-mile. Then, bear right onto Bill Hall Road and travel 1.5 miles. The
project area (Area 3) is approximately 400 feet to the east and extends approximately 0.5-
mile to the north and 400 feet to the south (Attachment 1, Figures 1 and 2).
Project Area (acres): 55 Nearest Town: Fayetteville
Nearest Waterway: Cape Fear River River Basin: Cape Fear 03030005
Latitude and Longitude: 34.836511N,-78.824527W
Existing Site Conditions
On July 1, 2015, The Chemours Company (Chemours), a spin-off company of DuPont
Chemical Company, took ownership of DuPont's 2,177-acre property and onsite
manufacturing units. The site is located approximately 15 miles southeast of the City of
Fayetteville and sprawls across the southern Cumberland and northern Bladen County
lines. Chemours has continued to use the property as a manufacturing facility (Chemours-
Fayetteville Works Facility) for plastic sheeting, fluorochemicals, and intermediates for
plastic manufacturing.
The Chemours Fayetteville Works Facility is bounded to the east by the Cape Fear River
(CFR), to the west by NC Highway 87, and by farmland to the north and south. A
majority of the property is developed and contains the manufacturing units. This area is
located on the high bluffs of the CFR and is relatively flat. The property has significant
topographic fall from the bluffs moving towards the river. The 55-acre project area (Area
3), located east of the development, runs parallel to the CFR and encompasses the river's
undeveloped, forested bottomland hardwood floodplain (Attachment 2, Figures 3 and 4).
Mapped soil types within the project area are hydric and consist of Wickham fine sandy
loam, 1-6 percent slopes and Congaree silt loam, frequently flooded (Attachment 2,
Figure 5). Dominate vegetation is comprised of lizard's tail (Saururus cernuus),
American elm (Ulmus americana), box elder (Acer negundo), Gray's sedge (Carex
grayi), red maple (Acer rubrum), bald cypress (Taxodium distichum), cherrybark oak
(Quercus pagoda), Frank's sedge (Carex frankii), Virginia creeper (Parthenocissus
quinquefolia), and American holly (Ilex opaca).
Within the project area, four tributaries and their respective abutting wetlands (Seeps A,
B, C, and D) were determined to have perennial flow that is driven by groundwater
seepage from the adjacent uplands to the west (Attachment 2, Figure 6). The tributaries
also receive stormwater flow and occasional backwater flooding from the CFR during
high flood events. For the purpose of this notice, only the conditions at Seep C are
Version 6.15.2017 Page 2

described because it is the only location that is subject to the current proposal, as
discussed in the Project Description below.
Seep C contains approximately 0.85-acre of wetland and 120 linear feet of perennial
stream (Attachment 2, Figure 7). Within the wetland, soils are silty loam that transition to
sandy loam at depths greater than 6 inches. Additionally, the wetlands are saturated to the
surface most of the year, making anaerobic/depleted soil conditions apparent. Overstory
trees and brush were removed from the area in coordination with the US Fish and
Wildlife Service to prevent the destruction of potential habitat for or the incidental take of
Red -Cockaded Woodpecker and Northern Long -Eared Bat.
Applicant's Stated Purpose
The applicant's stated purpose is to conduct a pilot study on the removal of
perfluoroalkyl and polyfluoroalkyl substances (PFAS) from surface water at the impact
location (Seep C) prior to discharging into the Cape Fear River.
Project Description
On February 25, 2019, the North Carolina Superior Court for Bladen County entered into
a Consent Order (CO) among Chemours and the State of North Carolina and Cape Fear
River Watch to address discharges of PFAS at the Chemours Fayetteville Works Facility
(facility). Among other directives, the CO requires that Chemours develop a remedial
plan for reducing PFAS loading from the facility to the Cape Fear River, beginning with
a pilot study. The current CO also requires that the pilot study to be constructed and
operational by November 16, 2020; therefore, mobilization for construction is intended
no later than October 5, 2020. To meet this deadline, the Corps is issuing this Public
Notice with a 15-day comment period rather than the standard 30-day period.
Release of PFAS to the Cape Fear River is derived from impacted groundwater
discharging to onsite surface waters via seeps that form perennial streams. Subsequently,
Chemours has designed an in -stream interim remediation system (flow -through cell) to
treat surface water prior to discharge into the river. An earthen dam will impound water
(approximately 6 feet in total height) to provide hydraulic head to allow for treatment
with granular activated carbon (GAC) filter beds. Impounded water will flow through an
inlet weir into a series of concrete basins to hydraulically control surface flow over
vertically oriented GAC beds. Water will then flow via gravity drainage through the GAC
beds and PFAS compounds will sorb to the media. Effluent water will collect in a stilling
basin where it will then discharge downstream into the channel and, ultimately, into the
Cape Fear River. Influent and effluent samples will be collected to monitor the PFAS
removal efficiency. GAC media will need to be periodically replaced (Attachment 3,
Figures 8-13).
Chemours is currently proposing to construct the flow -through cell system at Seep C only
as a pilot study. Results of the study will inform the design, optimization, and installation
of flow -through cells at the three additional seep locations. Construction of the treatment
Version 6.15.2017 Page 3

system at Seep C requires impacts to approximately 0.16-acre of wetland and 120 linear
feet of perennial stream. The currently proposed impacts are cumulative to impacts
previously authorized on October 29, 2019, by Nationwide Permit 38-Cleanup of
Hazardous and Toxic Waste for the construction and stabilization of an in -stream weir
and the associated impoundment of waters at Old Outfall 002 (Area 2 on Attachment 1,
Figure 2). Approximately 475 linear feet of perennial stream channel and 45 linear feet of
ephemeral channel were impacted for this project (Attachment 4, Figures 14 and 15).
It is anticipated that a permit modification request for impacts at the three additional seep
locations will be submitted in December 2020 after one month of pilot study data
collection. The flow -through cells are expected to be in operation for approximately two
to three years, at which point a long-term remedy for surface and groundwater treatment
will be constructed.
Avoidance and Minimization
The applicant provided the following information in support of efforts to avoid and/or
minimize impacts to the aquatic environment: The location of the pilot study on Seep C is
positioned at the narrowest point of the stream and wetland in an effort to avoid and
minimize impacts to larger, abutting wetlands.
Compensatory Mitigation
The applicant offered the following compensatory mitigation plan to offset unavoidable
functional loss to the aquatic environment: The applicant is proposing to delay mitigation
requirements until the request for a permit modification is submitted for impacts at the
three additional locations at which time the applicant will propose mitigation for the
cumulative impacts of both permit requests.
Essential Fish Habitat (EFH)
The Corps' determination is that the proposed project would not effect EFH or associated
fisheries managed by the South Atlantic or Mid Atlantic Fishery Management Councils
or the National Marine Fisheries Service.
Cultural Resources
Pursuant to Section 106 of the National Historic Preservation Act of 1966, Appendix C of
33 CFR Part 325, and the 2005 Revised Interim Guidance for Implementing Appendix C,
the District Engineer consulted district files and records and the latest published version
of the National Register of Historic Places and initially determines that:
No historic properties, nor properties eligible for inclusion in the National
Register, are present within the Corps' permit area; therefore, there will be no
historic properties affected. The Corps subsequently requests concurrence from
the State Historic Preservation Office (SHPO).
Version 6.15.2017 Page 4

The District Engineer's final eligibility and effect determination will be based upon
coordination with the SHPO, as appropriate and required, and with full consideration
given to the proposed undertaking's potential direct and indirect effects on historic
properties within the Corps-indentified permit area.
Endangered Species
Pursuant to the Endangered Species Act of 1973, the Corps reviewed the project area,
examined all information provided by the applicant and consulted the latest North
Carolina Natural Heritage Database. Based on available information:
The Corps determines that the proposed project would not affect federally listed
endangered or threatened species or their formally designated critical habitat.
Section 408
There are no Corps Civil Works project(s) within or in the vicinity of the applicant's
proposed project.
This public notice is not a paid advertisement and is for public information only. Issuance
of this notice does not imply Corps endorsement of the project as described.
Any comments received will be considered by the Corps in determining whether to issue,
modify, condition or deny a permission for this proposal if received before the comment
period expiration date. To make its decision, the Corps will review comments received to
supplement and inform its assessment of impacts on endangered species, historic
properties, water quality, general environmental effects, and other public interest factors
listed above. Comments will be taken into consideration in the preparation of an
appropriate document pursuant to the National Environmental Policy Act (NEPA) (e.g.
Environmental Assessment). Comments will also be used to determine the need for a
public hearing and to determine overall public interest in the proposed action.
It should be noted that materials submitted as part of Section 408 requests become part of
the public record and will be available to the general public under the provisions of the
Freedom of Information Act (FOIA). Individuals may submit a written request to obtain
materials under the FOIA or make an appointment to view the project file at the USACE
Wilmington District's Office of Counsel.
Other Required Authorizations
The Corps forwards this notice and all applicable application materials to the appropriate
State agencies for review.
North Carolina Division of Water Resources (NCDWR): The Corps will generally not
make a final permit decision until the NCDWR issues, denies, or waives the state
Certification as required by Section 401 of the Clean Water Act (PL 92-500). The receipt
Version 6.15.2017 Page 5

of the application and this public notice, combined with the appropriate application fee, at
the NCDWR Central Office in Raleigh constitutes initial receipt of an application for a
401 Certification. Unless NCDWR is granted a time review extension, a waiver will be
deemed to occur if the NCDWR fails to act on this request for certification within sixty
days of receipt of a complete application. Additional information regarding the 401
Certification may be reviewed at the NCDWR Central Office, 401 and Buffer Permitting
Unit, 512 North Salisbury Street, Raleigh, North Carolina 27604-2260. All persons
desiring to make comments regarding the application for a 401 Certification should do so,
in writing, by September 15, 2020, to:
NCDWR Central Office
Attention: Mr. Paul Wojoski, 401 and Buffer Permitting Unit
(LISPS mailing address): 1617 Mail Service Center, Raleigh, NC 27699-1617
Or,
(physical address): 512 North Salisbury Street, Raleigh, North Carolina 27604
North Carolina Division of Coastal Management (NCDCM):
The application did not include a certification that the proposed work complies
with and would be conducted in a manner that is consistent with the approved
North Carolina Coastal Zone Management Program. Pursuant to 33 CFR 325.2
(b)(2) the Corps cannot issue a Department of Army permit for the
proposed work until the applicant submits such a certification to the Corps and
the NCDCM, and the NCDCM notifies the Corps that it concurs with the
applicant's consistency certification. As the application did not include the
consistency certification, the Corps requests, via this Public Notice, concurrence
or objection from the NCDCM.
Evaluation
The decision whether to issue a permit will be based on an evaluation of the probable
impacts including cumulative impacts of the proposed activity on the public interest.
That decision will reflect the national concern for both protection and utilization of
important resources. The benefit which reasonably may be expected to accrue from the
proposal must be balanced against its reasonably foreseeable detriments. All factors
which may be relevant to the proposal will be considered including the cumulative effects
thereof, among those are conservation, economics, aesthetics, general environmental
concerns, wetlands, historic properties, fish and wildlife values, flood hazards, flood plain
values (in accordance with Executive Order 11988), land use, navigation, shoreline
erosion and accretion, recreation, water supply and conservation, water quality, energy
needs, safety, food and fiber production, mineral needs, considerations of property
ownership, and, in general, the needs and welfare of the people. For activities involving
the discharge of dredged or fill materials in waters of the United States, the evaluation of
Version 6.15.2017 Page 6

the impact of the activity on the public interest will include application of the
Environmental Protection Agency's 404(b)(1) guidelines.
Commenting Information
The Corps of Engineers is soliciting comments from the public; Federal, State and local
agencies and officials, including any consolidated State Viewpoint or written position of
the Governor; Indian Tribes and other interested parties in order to consider and evaluate
the impacts of this proposed activity. Any comments received will be considered by the
Corps of Engineers to determine whether to issue, modify, condition or deny a permit for
this proposal. To make this decision, comments are used to assess impacts on endangered
species, historic properties, water quality, general environmental effects and the other
public interest factors listed above. Comments are used in the preparation of an
Environmental Assessment and/or an Environmental Impact Statement pursuant to the
NEPA. Comments are also used to determine the need for a public hearing and to
determine the overall public interest of the proposed activity.
Any person may request, in writing, within the comment period specified in this notice,
that a public hearing be held to consider the application. Requests for public hearings
shall state, with particularity, the reasons for holding a public hearing. Requests for a
public hearing will be granted, unless the District Engineer determines that the issues
raised are insubstantial or there is otherwise no valid interest to be served by a hearing.
The Corps of Engineers, Wilmington District will receive written comments pertinent to
the proposed work, as outlined above, until 5pm, September 15, 2020. Comments should
be submitted to Emily Greer, Wilmington Regulatory Field Office, 69 Darlington
Avenue, Wilmington, North Carolina 28403 , at emily.c.reer(c�usace.army. mil.
Version 6.15.2017 Page 7

ATTACHMENT 1

6/5/2019 ConnectGIS Feature Report
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NOTES:
1. GRID COORDINATE SYSTEM CORRESPONDS TO NAD83, NORTH CAROLINA.
2. ELEVATIONS PRESENTED ARE IN FEET, NAVD 88.
3. TOPOGRAPHIC, ROADS, BUILDINGS, AND PROPERTY LINE INFORMATION OBTAINED FROM
FREELAND-CLINK SCALES & ASSOCIATES, INC. OF NC. SURVEY OF THE CHEMOURS
FAYETTEVILLE WORKS SITE DATE 7 JANUARY 2019.
4. BYPASS SPILLWAY AND SLOPES SHALL BE ARMORED WITH 12-INCH THINK (MIN) LAYER OF
RIPRAP AND UNDERLAIN WITH A GEOTEXTILE SEPARATOR.
5. MAINTENANCE PLATFORM SHALL BE SURFACED WITH A 6-INCH (MIN) LAYER OF AGGREGATE
AND UNDERLAIN WITH A GEOTEXTILE SEPARATOR.
6. DISTURBED AREAS NOT SURFACED WITH AGGREGATE OR CONCRETE WILL BE SEEDED AND
MULCHED.
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SCALE: 1 " = 2'
FACE MOUNT 5
SAFETY RAILING
(TYP) C-05
RIPRAP
6"
5'
INFLUENT d
3„ o00 00 000000 �00 0°0000^
Oo
STILLING BASIN 1 -14 0°°00°oa 0°0°0o°a 0 goo°poo°poo°
9 0°0000 �a00oo0000 a0
oO�0a0 00°00 o0n0 oD o
d . ... •.X — 77-X - V X i:'r^.3C' 000 oo
4' O o O
t.
d 'a
6" CONCRETE SLAB WITH
WELDED WIRE FABRIC
A SECTION
-03 BYPASS SPILLWAY FLOW
MEASUREMENT FLUME
SCALE: 1" = 2'
—13'
A MINIMUM DEPTH = 9"
�O0 ,0 0 50 100 D00 Do 0 D O0 000 000 000 000 Do 0 000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
-0-0 0 -0 0 -0 0 -0-0 0 -0 0 0 0
\_[1 oC1 o C1 oC1 o C1 oC1 o C1 o C1 oC1 o C1 oC1 o C1 0 o C1 o C1 oC1 o C1 oC1 oC1 S✓
OO`b �O`b �O`b �O`b �O`b �O`b �O`b �O`b �O`b �O`b �O`b �O `b �11ID00_11
�'1f 00 00 00 00 00 00 0000 00 00 0� 0yp 21 2 o n a&_� o00 01"3OOo �O o
�L3� �,�aa MAXIMUM HEIGHT = 2
GEOTEXTILE
NOTES:
1. STONE CHECK DAMS SHOULD BE CONSTRUCTED USING USING NC DOT CLASS B STONE. THE
UPSTREAM FACE OF THE ROCK STRUCTURE SHOULD BE COVERED WITH FINE GRAVEL (NCDOT
#57 OR #5 WASH STONE) A MINIMUM OF 1 FOOT THICK TO REDUCE THE DRAINAGE RATE.
2. GEOTEXTILE SHALL BE SELECTED IN ACCORDANCE WITH AASHTO M288-96 SECTION 7.3,
SEPARATION REQUIREMENTS.
2 DETAIL
C-0 ROCK CHECK DAM
SCALE: 1 " = 2'
8' max. standard strength fabric with wire fence
CARBON BED 1 DRAIN
6' max. extra strength fabric without wire fence
3" PVC PIPE
CARBON BED 2 DRAIN
3" PVC PIPE
Steel
post
Plastic or
wire ties
e
OFF VALVE (TYP)
Wire
M
18-24"
fence
DISCHARGE BASIN
Natural
DRAIN TO RIVER
;�a ground
8" PVC PIPE
;mm
8" down & 4"
forward along
24"
the trench
Filter
ifabric
NOTES:
1. A FIBERGLASS GRATE WILL BE INSTALLED OVER THE INFLUENT STILLING BASIN
AND TRANSFER BASIN TO PROVIDE OPERATOR ACCESS TO FLOW CONTROL
VALVES AND SAMPLE LOCATIONS. SEE DRAWING C-05 FOR DETAILS
2. TRANSDUCERS WILL BE INSTALLED IN THE INLET CHAMBER AND THE EFFLUENT
STILLING BASIN TO MONITOR WATER LEVELS. THE FLOW RATES THROUGH THE
BYPASS SPILLWAY FLUME AND THE FILTER BED SYSTEM WILL BE CALCULATED
BASED ON THE WATER LEVELS MEASURED IN THE INLET CHAMBER AND THE
EFFLUENT STILLING BASIN, RESPECTIVELY.
3. COMPOSITE SAMPLERS WILL BE PLACED WITHIN THE INLET CHAMBER AND THE
EFFLUENT STILLING BASIN FOR PERFORMANCE MONITORING. GRAB SAMPLES
WILL ALSO BE PERFORMED AS NECESSARY, INCLUDING FROM WITHIN THE
TRANSFER BASIN, TO EVALUATE BREAKTHROUGH.
4. SAFETY RAILING SHALL BE FACE -MOUNTED AND REMOVABLE.
30% DESIGN DRAWINGS
NOT FOR CONSTRUCTION
1 2 3 4 5 6
Wire
fence
Cross -Section
View
Filter
Steel
fabric Backfill trench Natural
post
and compact ground
thoroughly
°min
° °
8„
m°®m°m.0°m° min
24"
° ° ° °
KO'3 DETAIL
C-03 SILT FENCE
(SOURCE: NC DEQ)
SCALE: NTS
0 2 4
SCALE IN FEET
A 08.12.20 300 DESIGN SUBMITTAL JFH CAS
REV DATE DESCRIPTION DRN APP
Geosyntec ti ATRIUM AT BLUE RIDGE
2501 BLUE RIDGE ROAD, SUITE 430
P.C.RALEIGH, NC 27607
consultants of NC, P919.870.0576
TITLE: Figure 10 SEEP C INTERIM REMEDIATION SYSTEM
CONSTRUCTION DETAILS I
PROJECT: THE CHEMOURS COMPANY
SEEP C INTERIM REMEDIATION SYSTEM
SITE:
FAYETTEVILLE WORKS SITE
DESIGN BY: CMDS DATE: AUGUST 2020
DRAWN BY: JFH PROJECT NO.: TR0795
CHECKED BY: JWE FILE: TR0795-050l .dwg
REVIEWED BY: JJD DRAWING NO.:
APPROVED BY: CAS C-03
7 8
W
I:
L
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F

1
DRAFT — NOT FOR CONSTRUCTION
oil
3
5
6 1 7 1 8
n
m
m
I
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F
INLET RECTANGULAR WEIR 8" THICK REINFORCED CONCRETE
WITH HAND PULL WALL WITH #4 @ 12" OC (TYP)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
INLET CHAMBER INFLUENT STILLING BASIN
8" THICK REINFORCED CONCRETE WALL
WITH #4 @ 12" OC (TYP)
OVERFLOW RECTANGULAR
WEIR WITH HAND PULL
36" W X 24" H ADJUSTABLE
(DOWNWARD OPENING)
WEIR WITH GEAR ACTUATOR
- - - - - - - - - - - - - - - - - - - - -
4 .
d
. EFFLUENT
' < .. CTII I IAI!'`_ QACIAI '•e'
26'-8"
K'B SECTION
Q-03 FILTER BED SECTION B
SCALE: 1 " = 3'
INLET MANIFOLD PIPING
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26'-8"
KT" SECTION
�Q�-03 FILTER BED SECTION C
SCALE: 1 " = 3'
26'-8"
D SECTION
C-03 FILTER BED SECTION D
SCALE: 1 " = 3'
3
FACE MOUNT 5
SAFETY RAILING
(TYP) C-05
8'-2"
DISCHARGE BASIN
DRAIN TO RIVER
8" PVC PIPE
FACE MOUNT 5
SAFETY RAILING
(TYP) C-05
8'-2"
CARBON BED 2 DRAIN
3" PVC PIPE
SHUTOFF VALVE
FACE MOUNT 5
SAFETY RAILING
(TYP) C-05
8'-2"
T-6"
FACE MOUNT 5
8" THICK REINFORCED CONCRETE WALL SAFETY RAILING
WITH #4 @ 12" OC (TYP) (TYP)
C-05
..' TRANSFER <' INFLUENT d
' : BASIN . ' : STILLING BASIN
..1 .
.e .e. .
T8" KNIFE GATE VALVE (TYP) ".
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MANIFOLD PIPING
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16' 6" PERFORATED PVC PIPE (TYP)
K'E SECTION
C-03 FILTER BED SECTION E
SCALE: 1 " = 3'
FACE MOUNT 5
8" THICK REINFORCED CONCRETE WALL OVERFLOW RECTANGULAR WEIR SAFETY RAILING
`WITH #4 @ 12" OC (TYP) / WITH HAND PULL f (TYP) C-05
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UNDERDRAIN COLLECTION SYSTEM
6" PERFORATED PVC PIPE (TYP)
16'
K'F
SECTION
C-03
FILTER BED
SECTION F
SCALE: 1 " = 3'
NOTES:
1. FIBERGLASS GRATING SHALL BE INSTALLED OVER THE INFLUENT STILLING BASIN
AND TRANSFER BASIN TO PROVIDE OPERATOR ACCESS TO FLOW CONTROL
VALVES AND SAMPLE LOCATIONS.
2. PIPE PENETRATIONS THROUGH CONCRETE WALLS WILL BE SEALED WITH GROUT
TO PREVENT LEAKAGE FROM CHAMBER TO CHAMBER.
3. PIPE SUPPORTS WILL BE INSTALLED TO SUPPORT PIPING AND VALVES AS NEEDED.
4. SAFETY RAILING SHALL BE FACE MOUNTED AND REMOVABLE.
UNDERDRAIN COLLECTION SYSTEM
6" PERFORATED PVC PIPE (TYP)
30% DESIGN DRAWINGS
NOT FOR CONSTRUCTION
4 1 5 1 6
0 2 4
SCALE IN FEET
A 1 08.12.20 1 300 DESIGN SUBMITTAL JFH CAS
REV DATE I DESCRIPTION DRN APP
Geosyntec'/ ATRIUM AT BLUE RIDGE
2501 BLUE RIDGE ROAD, SUITE 430
RALEIGH, NC 27607
consultants of NC, P.C. 919.870.0576
TITLE. Figure 11 SEEP C INTERIM REMEDIATION SYSTEM
CONSTRUCTION DETAILS II
PROJECT: THE CHEMOURS COMPANY
SEEP C INTERIM REMEDIATION SYSTEM
SITE:
FAYETTEVILLE WORKS SITE
DESIGN BY: CMDS
DATE: AUGUST 2020
DRAWN BY: JFH
PROJECT NO.: TRO795
CHECKED BY: JWE
FILE: TRO795-0502.dwg
REVIEWED BY: JJD
DRAWING NO.:
C-04
APPROVED BY: CAS
7 1 8
n
L
I�
J
E
F

E
4 7 7 A G 7 O
I L 0 It J V / V

E
4 7 7 A G 7 O
I L 0 It J V / V

ATTACHMENT 4

ELEVATION �/� N
_ SL
W E
ELEVAT ON
- --��46 MS -
�
EVATIO APP X AT
46.58 MSL\� CENTER O
�-BACKWATER LIMIT STREAM
484 FE T
43
41
LENGTH OFF \ i
ADDITIONAL BACK W TER �\
LEGE D CENTER OF STR AM �� \
APPROX. BACKWATE LIMITS +/-45 FEE
APPROX. CENTE F STREAM(S)
ELEVATIONS L 44
TOP F WE2�
46.58
5 100 15 (OP RATING)
1\

PLOT DATE: 6/27/2019 4:00 PM PLOTTED BY: ITSCHNER, KARL