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HomeMy WebLinkAbout20190752 Ver 4_Public Notice_20200901EM 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 (910) 678-1213 Agent: Parsons, Luke Eggering 530 Maryville Centre Drive, Suite 400 St. Louis, Missouri 63141 (314) 819-5020 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 Bladen2 &CONNEwC T�'r��,,'f? #. G r Printed June05,2019 t � \ _ .� � Parcels Major Roads MBERLAND CO L1 N Centerlines 87 Municipal Limits County Boundary 0 LL' Surrounding Counties J W YrI 3 187 1 : 2266 Feet Figure 1 https://bladen2.connectgis.com/DownloadFile.ashx?i=_ags_map895eafa4ce78452eb7cO3773f79fdc25x.htm&t=printid 1/3 s Swans Creek �s N L3it\ a Kirks Mill Creek fi- M � • I -A • F_e Unnamed Tributary- - � �-�� � '� Willis Creek - •� }� AIL aI . k\N is GeorJ��, The Chemour Company Fayetteville Works Cumberland County, North Carolina 0 625 1,250 2,500 Perennial Stream Feet Study Area Figure 2 0 ATTACHMENT 2 USGS Excerpt - Chemours Flow -through Cells Project Area eek� e�ml = �� v o 0 Flow-throug= Project Location i �I I i W. ce � Q _ 0 Figure 3 ton! FEMA Flood Map Service Center: [https://msc.fema.gov/portal/search#searchresultsanchor] REA I.=:F fAINILIAL Fl- APproamate loeation based on user input Without Base Flood f levetlon (SFE) +. z and does not represent an avthoritati � v 4 With BFE dr Death Property 1ocaUdn SPECIAL FLOOD PIN HAZARD AREAS Regulatory Floodway rant ee. Ao, Am. we. AR Sekwed FYDoMlap Boundary 0.2%Annual Chance Flood Haxard. AreaS OataA�adatrle Dig"of 1%annual chance flood with are rage W Dig" Data Available depth less than one foot or wlm dralnago areasof less than one Square mile zwe e MAP PANELS Unmapped Future Conditions 1%Annual Cdlanoe Flodd HaZWdz—x krtE Area of f.lmwrtad frood na_rard = = Area with Red uoed Flood Risk due to Effectme LOftRs OTHER AREAS OF Levee. See Notes. --, x Area of vndeter mi ned Flood "ward =>•= = FLOOD HAZARD Area with Flood Risk due to Levee - •: _ �—t-- DO eru'Se Protected Area OTHER AREAS ® Coital Barrier Resauroe Sysleri Area p m Crass Sections wllh 1% Annual Chance 17.s Water Surf ace ElrJaloon to- _ _ Coastal Transact Base Flood Elevation Line IBFEI Limit of Study lunsMctlan Boundary Coasta I 1 ra rtsect Base I I ne OTHER _ profile Baseline FEATURES HydroguVritc Fealura GENERAL ^--' Channel, Culvert. or Stomi Sewer STRUCTURES 11 i r i r r Levee. Dike. or Floodwa11 Figure 4 697200 34° 51' 11" N 17011 M r g 34° 49' 35" N 697200 697500 697800 698100 698400 b Map Scale: 1:14,400 if printed on A portrait (8.5" x 11") sheet. Meters NN 0 200 400 800 1200 N Feet 0 500 1000 2000 3000 Map projection: Web Mercator Comer coordinates: WGS84 Edge tics: lfrM Zone 17N WGS84 USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey Soil Map—Bladen County, North Carolina (The Chemours Company - Fayetteville Works) 697500 697800 698100 698400 698700 698700 a L34° 51' 11" N g 34° 49' 35" N 699000 6-093M a Figure 5 2/27/2019 Pagel of 3 Results fr, !}'SEEP A SEEP - f4 _ ` 6 t 1Y • - 91 • • • • • Ephemeral Stream ® Culvert The Chemours Company — Intermittent Stream 0 Data Sheet Point Fayetteville Works 0 250 500 Bladen County, North Carolina Perennial Stream ® Wetland/Seep mommooK== Feet Figure 6 5 TI ♦ ty IUL . a'w La p_e Fear RivE _ ,� � ► , Figure 7 Ephemeral Stream ® Culvert The Chemours Company Intermittent Stream J Data Sheet Point Fayetteville Works 0 50 100 Bladen County, North Carolina Perennial Stream Wetland/Seep Feet ATTACHMENT 3 I L J DRAFT — NOT FOR COt4STRUCTION a �� i \ a \ \ o c \ \ FAYETTEVILLE WORKS SITE ( \ \ N 396500 SEEP C PILOT TEST LAYOUT —N— EXISTING CLEARED AREA a I 'C' 6 A WETLANDS (NOTE 4) I SEEP LEGEND a \ I FILTER BED 1 h C-03 I 40 EXISTING CONTOUR 3 N 396000 — — — — — — — — — — — EXISTING CLEARED AREA E I I \ \ PROPERTY LINE C j o I o PROPERTY LINE m 1l EXISTING ROAD EXISTING STRUCTURE 3 15p o 1 I 1 a �j G m STREAM / RIVER CONSTRUCTION ROUTE 1401 WETLANDS �13p N 395500 ° J C 1 0 a i L Its a 0 0 �.. / ` 120 �\ 0 \ 0NOTES: N 395000 ' 0 —130 ° DAM 1. GRID COORDINATE SYSTEM CORRESPONDS TO NAD83, NORTH CAROLINA. 110 �00 �2 0 " ❑ 2. ELEVATIONS PRESENTED ARE IN FEET, NAVD 88. 3. TOPOGRAPHIC, ROADS, BUILDINGS, AND PROPERTY LINE INFORMATION 7p° �110 ^O 0 OBTAINED FROM FREELAND-CLINK SCALES & ASSOCIATES, INC. OF NC. SURVEY OF THE CHEMOURS FAYETTEVILLE WORKS SITE DATE 7 JANUARY 2019. ° �100 �00 0 p o LOCK 4. APPROXIMATE EXTENT OF DELINEATED WETLANDS. (WATERS OF THE UNITED STATES TECHNICAL REPORT, THE CHEMOURS COMPANY FAYETTEVILLE WORKS PROJECT: FLOW -THROUGH CELLS, SEEP C PILOT STUDY, AND REVISED SEEP A. ° 000�� Q , \ PARSONS, AUGUST 2020) 9p o d W.D. HUSKE LOCK AND DAM `80 P o a � 1 0 N 394500 �\ I b o \ 0 150 300 90 ° 1 SCALE IN FEET E A 08.12.20 30% DESIGN SUBMITTAL JFH CAS \ J 1 REV DATE DESCRIPTION DRN APP ATRIUM AT BLUE RIDGEGeosyntec`o� 2501 BLUE RIDGE ROAD, SUITE 430 o p RALEIGH, NC N 394000 J �O 919.870.0576.0576 consultants of NC, P.C. ITITLE: Figure 8 OVERALL SITE PLAN o PROJECT: THE CHEMOURS COMPANY SEEP C INTERIM REMEDIATION SYSTEM OLD OUTFALL 002 SITE: FAYETTEVILLE WORKS SITE 0 0 CDCDCDLn N 0 0 CD N 0 0 N 0 0 Ln /N 0 0 0 N N 90 0 0 Ln I N 1 N o 0 0 CDCD co N DESIGN BY: CMDS DATE: AUGUST 2020 DRAWN BY: JFH PROJECT NO.: TR0795 F CHECKED BY: JWE FILE: TR0795-Cl01.dwg 30 % DESIGN DRAWINGS REVIEWED BY: JJD DRAWING NO.: NOT FOR CONSTRUCTION APPROVED BY: CAS C-01 A n O A G C 11 7 0 It 1 1 2 1 3 1 4 1 5 1 6 II DRAFT - NOT FOR CONSTRUCTION LO N LO \ CD N W ilk m E F INLET WEIR EL = 40.85 RIPRAP ARMORED SLOPE 8.17' BOTTOM OF SLAB_ EL = 34.18 10'X10' FILTER BED (TYP OF 2) 60 MAINTENANCE PLATFORM EL = 42.35� W MODULAR BLOCK WALL W 50 (OR SHEET PILE) IL Z ---- _ O 40 T FINISHED GRADE j IN FRONT OF WALL 30 J W FILTER BED PERIMETER WALL 20 0+00 INLET WEIR EL = 40.85 + 26.67' 7.5' TOP OF FILTER BED PERIMETER WALL EL = 42.35 RIPRAP ARMORED SLOPE EXISTING GROUND - f-- - — - - TOP OF SLAB OUTLET PIPE INVERT EL = 34.85 EL = 34.79 1 +00 DISTANCE (FEET) SECTION A HORIZONTAL: 1" =20' VERTICAL: 1" =20' TOP OF FILTER BED PERIMETER WALL EXISTING EL = 42.35 GROUND - 8.17 BYPASS SPILLWAY 1--16' -EL = 42.10 - - BYPASS SPILLWAY / FLOW MEASUREMENT FLUME EL = 41.35 _BOTTOM OF SLAB FI = Rd 1 R DISTANCE (FEET) SECTION B HORIZONTAL: 1" =20' VERTICAL: 1" =20' 40 LEGEND 1+00 EXISTING CONTOUR FINISHED GRADE CONTOUR EXISTING CLEARED AREA PROPERTY LINE EXISTING ROAD EXISTING STRUCTURE STREAM / RIVER WETLANDS Fm 50 W IL Z 40 O Q 30 J L ' 20 1 +59 H 50 W IL 40 z0 H 30 J L ' 20 1 +40 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. 0 20 40 SCALE IN FEET A 08.12.20 300 DESIGN SUBMITTAL JFH CAS REV DATE DESCRIPTION DRN APP Geosyntec 1/ ATRIUM AT BLUE RIDGE 2501 BLUE RIDGE ROAD, SUITE 430 RALEIGH, NC 27607 consultants of NC, P.C. 919.870.0576 TITLE. Figure 9 SEEP C INTERIM REMEDIATION SYSTEM \ WITH RECTANGULAR WEIR W W\ W W INV. EL = 34.79 W W W W W W W W �'-�� W W W W W W�—W PLAN 4 �... i w w w w PROJECT: W W W W W W W W W W W W W W W W W W W W W W W W W W THE CHEMOURS COMPANY 1 10'X10' FILTER BED TYP OF 2 ROCK CHECK DAM �0 SEEP C INTERIM REMEDIATION SYSTEM C-03 \ w w w + C-03 w w w w w r w w w w w w r w w w w w v SITE: FAYETTEVILLE WORKS SITE o I DESIGN BY: CMDS DATE: AUGUST 2020 N DRAWN BY: JFH PROJECT NO.: TR0795 ^o .I I � CHECKED BY: JWE FILE: TR0795-C102.dwg CD 00 3q% DESIGN DRi WINGS REVIEWED BY: JJD DRAWING NO.: NOT FOR CONSTRUCTION APPROVED BY: CAS C-02 1 2 3 4 5 6 1 7 8 n L I E F 1 oil DRAFT - NOT FOR CONSTRUCTION 3 .19 5 II W N E F 2" PVC BALL Vf FILTER BED WALL 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 I E F 1 DRAFT — NOT FOR CONSTRUCTION oil 3 5 6 1 7 1 8 n m m I E 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 2" PVC PIPE (TYP) .. .. .' d. ' . . e. U. + d. °, .. ,' . ad.. 4• d: .•. ° . e ' I • ° a. a • ; �; •. "' ° ,. <: a, :a i ♦. r r i •d.' e° d• °f N . • . . .. . . a .;.. : , . .a . O ... . .d • , Q.. ' , .. ar . ,. ., . • 'd: ' Q a .1. 0 i.: ,. ...,. .'• jj { . •d. 0.. '. . i _ Q r' • a .9' 'm ,° a .. 'r ..d <' d r •d .. . '� I e <' .. a r :; A :'4 d 4. r d 1.. : ... d' a .. . • •d' .. p TRANSFER : r • d �a d d L 4r a .. ... '9 `T .'� d. ♦. d • a..•.4 •.b° r• °i•� BASIN r .. I d'. d d � a •• y .• �d •j. d 'FI R'.BED . P ' ' a 4� • .. a' . ,A . ed •a .a .4 .. - .. .. E. .;'' i. I.. ,:' i'" ... .. ..d , a d' d , a, d% p ' I. ♦ 'a I .�.. l b I � :1. 'd' .*d 4 • d + 9' .. d' r... A. .. ... f 4. i:. .< •. . . . .. ,.' b . d .. • '..d. •4 .I. .. 14 ad 4... ° TRANSFER BASIN d' . .. a '4 . d". •e , •.I • a.' r'• •d b;a -4�� d b ' d. d•' �d• e MANIFOLD PIPING i. ° °e''' .. • 'e • d e e I e' 8 PVC TYP a p e 4 ' 4: .. a •e i 'e" .. 4 .'S 4 �• a, • ..'. b. _ .. .. d. '. ••.. x' .' I. . q d ♦ ' a" : p'. a .. ... ..a 4 b d . . C ,. .. d. d.•'• :e '.1 .. B.: ..� • .'a .. �. .:. 4 .d: a° t.. '.a:: ° , ..p • d` . .'. 1: . d d 4 . , I. 4 �� ..A. 2 9 E �GAR'BO.I�EDs1':.D. . �?P, .4 . i B e . a d 4 - • ..d d a' . °rd d .. a a ♦ e <. . °'a a m , 11 4... : P : P:.I PE C .e° , . a . .. i d . .' . d ° . ..' a a a.. d' .. :4• 'd•• d a<: — --- 4 d'° ': n. a * -** :Z� sLl °,T.. —;1—�- -: d . :.: jrs_-- -- ��,.--�-- — -- —. <� • . d .. a..., 4 .Q �,'.SL ..:d r4 • . * a, 44 . - . : - - * -� .'i . . .. . I � . . . : : . . . -� . : . .. .*. . . 4 ' . . . . .. . .. . . . T-6" 1 oil 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) ". .d .A. .. t . : d I i 8" TRANSFER BASIN 4 .. MANIFOLD PIPING :-\\ .: .°d d d + 8'-2" . . *: �.*.' -La] o .. � ; '.:. " a .. a a a ' < ' 4 '. 1 ,d .d ."•,' . . * � . L . . . - . . -d b .m. . •i_ O a ,: ;, .° a .. a .P UNDERDRAIN COLLECTION SYSTEM 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 . ..d' .. " `d . ,4' a ` • .4 +" INFLUENT •. ..4f .°...• .r a . d ', .. ♦ •. . , 4. a.. °.j' . a " STILLING BASIN a a' I*.. d . ., d aO.. ...e +. d! . 3 ° .. 2'-6" •° .. i� ' "n' , ' � da {{ . a. _ ... t { : • j b. 4 t I °. d d d ' .e , :' '�.4 P- ; '�. a.d:. , ' p' �� 8 TRANSFER . 4 ° . . •v .. . d' d °..d . e BASIN MANIFOLD 4 d 4. •.' a • • •d e e. . p PIPING d ^• `. d , _ d .. d .. d . a'e. a .4 p '. .4' .a ad ° °. .d - 7 6 r: : 4 .d, I J' ' •':.<.". 'da i ' 4 .. .. . 4. °• a .. 'y . a i ,d e' TRANSFER e a .J. • a' d. . n - 82 .. a .. d . d : .. • BASIN •. .p ': a'. A `p " " . a .* " ,g. ♦ r .. a a , .0 4 ' °5 `d a. .. . . *A,: 44 �d 'A •a . 1' i ' ''d i' °d4. °< i'. r `'. d •d I d e j d . °'d d• .., 4. ' e b. ° i E d', ' a . I� 9 4 - • d d a • j.. d � C ' �' . '' 4': .. e <" .. : a.a 1 "d .. .. '.b' :d.: 4: p p.Q .4 <1i. .. . , d AA 6) > <• .. .<,', :4. .: A. .4L '. a♦ 4 . - a d is %d .4 ... . 1Q . :e '.d :d e:• °' d+. • 4' ... . � . 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