HomeMy WebLinkAbout2019.08.21_CCO.p11_SedimentCharacterizationPlan
Sediment Characterization Plan
Prepared for
The Chemours Company FC, LLC 1007 Market Street
PO Box 2047 Wilmington, DE 19899
Prepared by
Geosyntec Consultants of NC, P.C.
2501 Blue Ridge Road, Suite 430
Raleigh, NC 27607
Geosyntec Project Number TR0795
August 2019
TR0795 ii August 2019
TABLE OF CONTENTS
1. INTRODUCTION ................................................................................................ 1
2. CHARACTERIZATION PLAN .......................................................................... 2
2.1 Sampling Locations ..................................................................................... 2
2.2 Sampling Schedule ...................................................................................... 2
2.3 General Sample Collection Considerations ................................................. 3
2.4 Sediment Sampling Procedures ................................................................... 5
2.5 Collection of Field Data .............................................................................. 6
2.6 Decontamination Protocol ........................................................................... 7
2.7 Sample Labels, Shipping, Chain of Custody, and Holding Times .............. 7
2.8 Quality Assurance/Quality Control ............................................................. 8
2.8.1 Field Documentation ....................................................................... 8
2.8.2 Bottleware ....................................................................................... 9
2.8.3 Field QA/QC ................................................................................... 9
3. TEST METHODS AND LABORATORY STANDARDS ............................... 10
3.1 Sample Analysis ........................................................................................ 10
3.2 Data Quality Objectives ............................................................................. 10
3.3 Data Verification ....................................................................................... 10
4. REPORTING ...................................................................................................... 13
5. REFERENCES ................................................................................................... 14
LIST OF TABLES
Table 1: PFAS and Associated Methods
Table 2: Description of Sampling Locations
Table 3: Sampling Containers, Preservation, and Holding Times
Table 4: Quality Assurance/Quality Control Samples
Table 5: Criteria for Achieving Data Quality Objectives
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LIST OF FIGURES
Figure 1: Sample Locations
Figure 2: Conceptual Layout of Transect Sampling Location
ACRONYMS AND ABBREVIATIONS
ADQM – analytical data quality management
COC – chain of custody
DO – dissolved oxygen
DQOs – data quality objectives
DVM – data verification module
HDPE – high-density polyethylene
LDPE – low-density polyethylene
NCDEQ – North Carolina Department of Environmental Quality
ORP – oxygen/reduction potential
PFAS – per- and polyfluoroalkyl substances
PTFE – polytetrafluoroethylene
QA/QC – quality assurance/quality control
QAPP – quality assurance project plan
RPD – relative percent difference
SOPs – standard operating procedures
USEPA – United States Environmental Protection Agency
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1. INTRODUCTION
This Characterization plan (the Characterization Plan) was prepared by Geosyntec
Consultants of NC, P.C. (Geosyntec) for The Chemours Company FC, LLC (Chemours)
to provide a plan for sampling and analysis of sediment in the Cape Fear River. This
Characterization Plan has been prepared pursuant to Paragraph 11.2 of the Consent Order
(CO) between the North Carolina Department of Environmental Quality (NCDEQ), Cape
Fear River Watch and Chemours entered into court on 25 February 2019. This paragraph
requires Chemours to develop a plan to assess the nature and extent of per- and
polyfluoroalkyl substances (PFAS) sediment contamination in the Cape Fear River
originating from the Fayetteville Works (Site) by 26 August 2019.
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2. CHARACTERIZATION PLAN
The purpose of this plan is to obtain information regarding concentrations of PFAS in
sediment upstream, adjacent to, and downstream of the Site in order to further define the
PFAS contributions originating from the Site and PFAS originating from other sources.
This sampling may occur in two phases. The first phase described in this Characterization
Plan is scheduled, contingent on NCDEQ approval, to be conducted in Fall 2019.
Following review of initial sampling data, a second phase of sampling to refine initial
findings may be planned, and if needed, an addendum to this Characterization Plan will
be prepared (potential timeframe: Spring/Summer 2020). Samples collected will be
analyzed for EPA Method 537 Mod and Table 3+ laboratory-specific Standard Operating
Procedures (SOPs) as listed in Table 1.
2.1 Sampling Locations
Investigative transects are proposed as indicated in Table 2 and Figure 1. The field team
may collect samples from different or additional locations depending on field conditions,
in-person observations, and/or accessibility considerations upon consultation with the
Geosyntec project manager.
Three sediment samples will be collected from each transect: one from the eastern side,
one from the western side, and one from a location between the other two samples
(conceptual layout provided in Figure 2). By collecting samples along a transect from
each location, analytical results will be correlated with a range of sediment transport
environments (depositional and erosional) and from a range of physical and chemical
sediment environments (e.g., potential variation in particle size and organic content to be
analyzed according to Table 3). Samples will be collected from upstream locations,
locations adjacent to the Site, and downstream locations as shown in Table 2 and Figure
1.
In addition to collecting sediment for analysis, field conditions in each transect location
will be recorded. Water depth and velocity will be measured in the same locations where
samples are collected from each transect. Sediment will be collected for visual evaluation.
2.2 Sampling Schedule
The proposed sampling associated with this first phase of work will be performed
according to the proposed schedule:
• Submission of Characterization Plan;
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• NCDEQ Approval (logistical planning to begin within 30 days after approval);
• 0 to 45 days – logistical planning;
• 45 to 75 days – Characterization Plan implementation, provided suitable weather
(contingent on NCDEQ approval timing); and
• Reporting within 90 days of receipt of full scope of validated analytical data. If a
second phase of sampling is performed, the report will be prepared to include both
phases.
2.3 General Sample Collection Considerations
Sediment sample collection considerations are outlined below and summarized in Table
2. Samples will be collected in accordance with the PFAS Quality Assurance Project Plan
(QAPP; AECOM, 2018).
The sampling team will attempt to collect samples when there has been no precipitation
for a minimum of 72 hours to limit the potential for suspended loads associated with rain
events to impact the interpretation of data. Where sample locations are within 0.5 miles
of each other, work will be conducted from downstream to upstream to the extent possible
to avoid disturbing sediment. Whenever possible, sample locations will be approached
from a downstream position for this same reason.
All work will be performed in compliance with the project Health and Safety Plan
prepared by Parsons (Parsons Health and Safety Plan Chemours Fayetteville Site, 2018).
A Plan on Action Discussion and Project Safety Analysis will be held prior to
commencing field activities. All work will be performed under Nationwide Permit 6
(USACE, 2017).
The following items are acceptable for use during PFAS sampling:
• High-density polyethylene (HDPE)1, silicone, acetate, and stainless-steel
sampling equipment and materials (e.g., sampling containers and lids, bowls,
pans, trays, spoons, trowels);
• Low-density polyethylene (LDPE)2 materials not in direct contact with the sample
(e.g., Ziploc® bags);
1 HDPE plastics are commonly identified by a recycling symbol with a number 2 inside it.
2 LDPE plastics are commonly identified by a recycling symbol with a number 4 inside it.
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• Plastic sleeves, core liners, and caps that do not contain TeflonTM or other
fluoropolymers (e.g., acetate, polyvinyl chloride, polycarbonate);
• Masonite or aluminum clipboards;
• Ballpoint pens;
• Sampling forms, loose paper or field notebooks, chain of custody (COC) record,
and sample container labels;
• Alconox®, Liquinox® and Luminox® detergents;
• Paper towels;
• Trash bags;
• HDPE sheeting;
• Hard-shell coolers;
• Shipping and handling labels;
• Regular (wet) ice;
• Bubble wrap; and
• Duct tape and packing tape.
The following products likely contain PFAS and will therefore be avoided during
sampling:
• Water-resistant paper, notebooks, and labels (e.g., certain Rite in the Rain®
products), due to use of PFAS in water-resistant inks and coatings;
• Sticky notes (e.g., certain Post-It® products), due to potential use of a paper
coating product Zonyl™ or similar fluorotelomer compounds;
• Plastic clipboards, binders, and spiral hardcover notebooks;
• Pens with water-resistant ink;
• Felt pens and markers (e.g., certain Sharpie® products) – some PFAS SOPs (e.g.,
Michigan) specifically allow Fine or Ultra-Fine Point Sharpies® and TestAmerica
Laboratories, Inc. routinely uses Sharpies® in the laboratory following
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unpublished analytical tests that reportedly showed no impact on PFAS sample
results;
• Aluminum foil, as PFAS are sometimes used as a protective layer;
• Decon 90™ liquid detergent, which reportedly contain fluorosurfactants;
• Chemical (e.g., blue) ice packs, unless it is contained in a sealed bag. Blue ice has
the potential to be contaminated from previous field sampling events;
• Materials containing polytetrafluoroethylene (PTFE), including Teflon™ and
Hostaflon®;
• Equipment with Viton™ components (i.e., fluoroelastomers);
• Stain- or water-resistant materials, as these are typically fluoropolymer-based;
• Material containing LDPE, particularly if used in direct contact with the sample
(e.g., LDPE tubing, as PFAS can sorb to the porous tubing); and
• Material containing “fluoro” in the name – this includes, but is not limited to,
fluorinated ethylene propylene, ethylene tetrafluoroethylene, and polyvinylidene
fluoride.
2.4 Sediment Sampling Procedures
Surface sediment samples will be collected from the sediment-water interface (i.e.,
mudline). Sediment samples will be collected with a petite ponar or similar device. Field
personnel will make three attempts to collect samples per location. If the initial location
does not provide a minimum recovery of 2 inches of material, sampling will be attempted
three additional times within a 20-ft radius of the original location. If samples meeting
minimum sample recovery cannot be retrieved after three attempts, field personnel may
relocate the sample to an area where recovery is feasible and which maintains the Data
Quality Objectives (DQOs). If multiple recoveries are required to meet sample mass
requirements, the samples will be located as closely as reasonably possible together, and
samples will be homogenized by stirring the sample with a stainless-steel spoon (or
similar) prior to filling sample jars.
Sediment sampling will be conducted in general accordance with EPA SOP SESDPROC-
200-R3 Sediment Sampling (EPA 2014).
The following sample procedures will be followed:
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• The sampling location will be field-located using a handheld GPS device. After
setting up on the sampling location, the as-built location coordinates will be
collected using the GPS device.
• Sampling personnel will use a new pair of nitrile sampling gloves at each
location.
• Surface samples will be collected using a petite ponar or similar device.
• The sample will be transferred to a decontaminated stainless-steel bowl. A photo
of the sample will be taken prior to disturbing the sample. Sediment texture and
other relevant observations will be noted on a field form. The sample will be
homogenized using a stainless-steel spoon to mix the sediment in the bowl prior
to filling the sample containers. Any large materials present in the sediment
(e.g., gravel, vegetation) will be avoided when filling sample bottles.
• Sediment will be transferred into the sampling containers using a stainless-steel
spoon or other appropriate device.
• Each sampling container will be capped, labeled as described in Section 2.7, and
temporarily stored on ice (4 ± 2°C) in a cooler to await transport or preparation
for shipment to the laboratory as directed in the QAPP.
• All reusable equipment will be decontaminated according to the procedures
described in Section 2.6.
• Disposable equipment and investigation derived waste will be transferred to the
Chemours plant for offsite disposal.
• Documentation will be maintained as described in Section 2.8.1.
2.5 Collection of Field Data
Water depths and water velocities will be measured at each location along each transect.
Sediment will be observed for color and texture.
The flow rate of the Cape Fear River will be measured using a submersible flow meter.
The height of the water and river bottom will be recorded at each point along each
transect. The flow meter will be submerged at each point, and the water velocity will be
recorded at 2 water depths at each point along the transect (e.g. top-half and bottom-half
of the water column).
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2.6 Decontamination Protocol
Sample containers will be new and used only once for each sample and disposable
equipment (e.g., gloves, tubing, etc.) will not be reused; therefore, these items will not
require decontamination.
All non-dedicated or non-disposable sampling equipment (e.g., stainless steel reusable
equipment used in sediment sampling) will be decontaminated between samples in the
following manner:
• Water rinse;
• Scrub with de-ionized water containing non-phosphate detergent (e.g.,
Alconox®);
• Tap water rinse; and
• De-ionized water rinse.
If there is a delay between decontamination and sample collection, decontaminated
sampling equipment will be covered with PFAS-free plastic until it is ready for use
(Ziploc® bags are acceptable for this purpose).
2.7 Sample Labels, Shipping, Chain of Custody, and Holding Times
Upon sample collection, each containerized sample will be labelled. Sediment sample
naming convention is as follows:
FAY-SED-CFR-RM-##-x-MMDDYY
Where:
o FAY indicates Fayetteville
o SED indicates sediment
o CFR indicates Cape Fear River
o RM indicates Rivermile
o ## to be replaced by the Rivermile associated with the sample (in whole
numbers or using decimal places for partial Rivermiles)
o x to be replaced by “a” to indicate western portion of River, “b” to indicate
middle area of river, and “c” to indicate eastern portion of River
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o MMDDYY indicates month, day, year, in 2-digit format (e.g., August 1,
2019 would be 080119)
Sample bottles will be placed as soon as possible into a durable zip-top plastic bag inside
an insulated sample cooler with ice. The cooler will serve as a shipping container and
will be provided by the laboratory along with the appropriate sample containers.
Samples will be shipped to either TestAmerica Sacramento, or Eurofins Lancaster
Laboratories depending on laboratory availability at the time of sampling. Chemours will
request that samples be analyzed by the laboratory within the holding times specified in
Table 3. The additional samples collected at each location for potential future analyses
will be stored under COC protocol in a secured, refrigerated location on Site.
Prior to shipment of the samples to the laboratory, a COC form will be completed by the
field sample custodian. Sample locations, sample identification numbers, description of
samples, number of samples collected, and specific laboratory analyses to be performed
on each sample will be recorded on the COC. The COC will be signed by the field
personnel relinquishing the samples to the courier and will be signed by the laboratory
upon receipt of the cooler. Prior to shipping, the cooler will be taped shut and a custody
seal will be taped across the lid of the cooler; laboratory personnel will confirm the
signature is intact upon receipt.
2.8 Quality Assurance/Quality Control
Quality assurance/quality control (QA/QC) activities will be performed in the field and
in the laboratories to document the data quality.
2.8.1 Field Documentation
Each sample will be labelled with a unique sample identification number as described in
Section 2.7, date, time, and the initials of the individual collecting the sample. A field
form will be used to record information regarding additional items such as QA/QC,
sample identifications, color, odor, turbidity, and other field parameters.
The project field team will keep a daily record of field activities during the execution of
field work including sampling notes and observations, instrument calibration records,
measured field parameters, sample COC and shipping records. All field collected data
will be furnished to Chemours within 10 business days of the conclusion of the field
event.
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2.8.2 Bottleware
Bottleware requirements are listed in Table 3. Bottleware will be pre-cleaned and will be
supplied by a vendor to minimize the risk of unplanned sample contamination from the
sample container (i.e., blank contamination).
2.8.3 Field QA/QC
Field QA/QC samples will be collected and analyzed along with the investigative samples
to evaluate potential bias and variability introduced in sample collection, storage,
handling and shipping. Criteria for achieving data quality objectives for field QA/QC
samples are summarized in Table 4. Four types of field QA/QC samples will be collected:
equipment blanks, trip blanks, field blanks, and field duplicates.
Equipment Blanks
Equipment blanks (field rinsate blanks) are used to evaluate equipment and cleaning or
decontamination procedures. At the sample location, laboratory-supplied analyte-free
water will be poured over or through the clean, non-dedicated sampling equipment, and
collected in a sample container. The equipment blank samples will then be shipped,
stored and handled with the other samples and will be analyzed for the same parameters
as other samples collected using the same device. Equipment blanks will be collected at
a frequency of one per day during sampling activities.
Trip Blanks
Trip blanks are used to assess whether samples might be inadvertently contaminated
during shipment and handling. The trip blanks will consist of a series of new containers
filled with analyte-free water prepared by the laboratory analyzing the samples and will
travel to the Site with the empty sample bottles and back from the Site with the
investigative samples. Trip blanks will not be opened in the field. Trip blanks will be
collected at a frequency of one per day during sampling activities.
Field Blanks
Field blanks are used to assess whether field conditions pose a potential for bias or
variability in the results of analysis. The field blank will be collected by transferring
laboratory-supplied analyte-free water into a sample container without contacting any
other sampling equipment. Field blanks will be collected at a frequency of one per day
during sampling activities.
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Field Duplicates
Duplicate samples are collected to assess the precision of the laboratory analysis through
calculation of the relative percent difference (RPD) between duplicate samples. The
equation for calculating RPD is shown below: 𝑅𝑅𝑅𝑅𝑅𝑅(%)= |(𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆 1 −𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆 2)|�(𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆 1 +𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆 2)2 � × 100%
RPDs less than or equal to 25% indicate acceptable precision at mid and high range
concentrations; RPDs less than or equal to 50% indicate acceptable precision within a
factor of five of the reporting limit. Duplicates will be collected in the same manner as
investigative samples and the duplicate samples will be analyzed for the same parameters
as the collocated investigative sample. Duplicates will be numbered sequentially with
investigative samples so they are not identifiable by the analytical laboratories (i.e.,
“blind” duplicates). Field duplicate samples will be collected at a minimum frequency of
one duplicate for every 20 investigative samples.
3. TEST METHODS AND LABORATORY STANDARDS
3.1 Sample Analysis
Samples will be collected and analyzed for methods according to Table 3.
3.2 Data Quality Objectives
DQOs are established here to provide data of known and sufficient quality to accomplish
the following:
• Characterize concentrations of PFAS in Cape Fear River sediment upstream,
adjacent to, and downstream of the Site;
• Collect related data on field conditions at each sampling transect.
The analytical criteria for achieving the DQOs are provided in Table 5.
3.3 Data Verification
The analytical laboratory performing the analysis will provide all analytical data to
Chemours’s data verification contractor, AECOM’s in-house Analytical Data Quality
Management (ADQM) group. The data package will be reviewed by ADQM for
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compliance with the laboratory SOPs and usability. The laboratory will also deliver the
analytical data electronically for upload to the Chemours Locus EIM™ database.
All data will be reviewed using the Data Verification Module (DVM). The DVM is an
automated database algorithm developed by the ADQM group that includes a series of
data quality checks, which are binary (yes/no) and do not require professional judgement.
Manual review is performed after the DVM process to address validation components
that are not readily automated. The data are evaluated against the following data usability
checks:
• Field and laboratory blank contamination;
• United States Environmental Protection Agency (USEPA) hold time criteria;
• Missing quality control samples;
• Matrix spike recoveries to verify measurement precision;
• Laboratory control sample recoveries verify measurement precision;
• Surrogate spike recoveries to verify measurement accuracy;
• RPD between field duplicate sample pairs to verify field duplicate precision;
• Completeness as a percentage of the planned samples actually collected and
analyzed; and
• Sensitivity of the practical quantitation limits compared to regulatory standards or
screening levels.
The DVM applies the following data evaluation qualifiers to analysis results, as
warranted:
• R - Unusable result. Analyte may or may not be present in the sample.
• B – Not detected substantially above the level reported in the laboratory or field
blanks.
• J – Analyte present. Reported value may not be accurate or precise.
• UJ – Not detected. Reporting limit may not be accurate or precise.
An individual DVM narrative report will be generated for each lot entered into the EIM™
database which will summarize any samples that are qualified, the specific reasons for
the qualification, and the potential bias in reported results.
The DVM review process described above will be performed on 100% of the data
generated for the sampling event. The DVM review process will be supplemented by a
manual review of the instrument- related QC results for calibration standards, blanks, and
recoveries to elevate the overall review process to be consistent with Stage 2b of the EPA
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Guidance for Labelling Externally Validated Laboratory Analytical Data for Superfund
Use (EPA-540-R-08-005, 2009).
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4. REPORTING
A report will be submitted following receipt of results. The report will include a map of
sample locations, data tables of measured concentrations, and a data review summary.
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5. REFERENCES
AECOM, 2018. Poly and Perfluoroalkyl Substance Quality Assurance Project Plan for
the Chemours Corporate Remediation Group. August, 2018.
EPA, 2009. Guidance for Labelling Externally Validated Laboratory Analytical Data for
Superfund Use. EPA-540-R-08-005, 2009. Stage 2b.
EPA, 2014. Region 4. Operating Procedure: Sediment Sampling. EPA SOP
SESDPROC-200-R3. August 2014.
Parsons, 2018. Health and Safety Plan Chemours Fayetteville Site.
United States Army Corps of Engineers. Nationwide Permit 6. 19 March 2017. http://saw-
reg.usace.army.mil/NWP2017/2017NWP06.pdf. Accessed 30 January 2019.
Table 1
PFAS and Associated Methods
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants NC, PC
TestAmerica Eurofins
Lancaster
HFPO-DA* Hexafluoropropylene oxide dimer acid 13252-13-6 C6HF11O3 1.00 TBD
PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 C5HF9O3 1.00 TBD
PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 C12H9F9O3S 1.00 TBD
PFMOAA Perfluoro-2-methoxyaceticacid 674-13-5 C3HF5O3 1.00 TBD
PFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 C4HF7O4 1.00 TBD
PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 C5HF9O5 1.00 TBD
PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 C6HF11O6 1.00 TBD
PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 C4HF7O3 1.00 TBD
Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 C8H2F14O4 1.00 TBD
EVE Acid Perfluoroethoxypropionic acid 69087-46-3 C8HF13O4 1.00 TBD
PFECA B Perfluoro-3,6-dioxaheptanoic acid 151772-58-6 C5HF9O4 1.00 TBD
R-EVE R-EVE NA1 C8H2F12O5 1.00 TBD
PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 C7HF13O7 1.00 TBD
Byproduct 4 Byproduct 4 NA1 C7H2F12O6S 1.00 TBD
Byproduct 6 Byproduct 6 NA1 C6H2F12O4S 1.00 TBD
Byproduct 5 Byproduct 5 NA1 C7H3F11O7S 1.00 TBD
NVHOS Perfluoroethoxysulfonic acid 1132933-86-8 C4H2F8O4S 1.00 TBD
PES Perfluoroethoxyethanesulfonic acid 113507-82-7 C4HF9O4S 1.00 TBD
NEtPFOSA NEtPFOSA 4151-50-2 C10H6F17NO2S 1.00 NA2
NEtPFOSAE NEtPFOSAE 1691-99-2 C12H10F17NO3S 1.00 NA2
NMePFOSA NMePFOSA 31506-32-8 C9H4F17NO2S 1.00 NA2
NMePFOSAE NMePFOSAE 24448-09-7 C11H8F17NO3S 1.00 NA2
PFESA-BP1 Byproduct 1 29311-67-9 C7HF13O5S 1.00 TBD
PFESA-BP2 Byproduct 2 749836-20-2 C7H2F14O5S 1.00 TBD
PFBA Perfluorobutanoic acid 375-22-4 C4HF7O2 0.200 2.0
PFDA Perfluorodecanoic acid 335-76-2 C10HF19O2 0.200 0.6
PFDoA Perfluorododecanoic acid 307-55-1 C12HF23O2 0.200 0.6
PFHpA Perfluoroheptanoic acid 375-85-9 C7HF13O2 0.200 0.6
PFNA Perfluorononanoic acid 375-95-1 C9HF17O2 0.200 0.6
PFOA Perfluorooctanoic acid 335-67-1 C8HF15O 0.200 0.6
PFHxA Perfluorohexanoic acid 307-24-4 C6HF11O2 0.200 0.6
PFPeA Perfluoropentanoic acid 2706-90-3 C5HF9O2 0.200 0.6
PFTeA Perfluorotetradecanoic acid 376-06-7 C14HF27O2 0.200 0.6
PFTriA Perfluorotridecanoic acid 72629-94-8 C13HF25O2 0.200 0.6
PFUnA Perfluoroundecanoic acid 2058-94-8 C11HF21O2 0.200 0.6
PFBS Perfluorobutanesulfonic acid 375-73-5 C4HF9SO 0.200 0.6
PFDS Perfluorodecanesulfonic acid 335-77-3 C10HF21O3S 0.200 1.0
PFHpS Perfluoroheptanesulfonic acid 375-92-8 C7HF15O3S 0.200 0.6
PFHxS Perfluorohexanesulfonic acid 355-46-4 C6HF13SO3 0.200 0.6
PFNS Perfluorononanesulfonic acid 68259-12-1 C9HF19O3S 0.200 0.6
PFOS Perfluorooctanesulfonic acid 1763-23-1 C8HF17SO3 0.500 0.9
PFPeS Perfluoropentanesulfonic acid 2706-91-4 C5HF11O3S 0.200 0.6
10:2 FTS 10:2-fluorotelomersulfonic acid 120226-60-0 C12H5F21O3 2.00 3.0
4:2 FTS 4:2 fluorotelomersulfonic acid 757124-72-4 C6H5F9O3S 2.00 3.0
6:2 FTS 6:2 fluorotelomersulfonic acid 27619-97-2 C8H5F13SO3 2.00 2.0
8:2 FTS 8:2 fluorotelomersulfonic acid 39108-34-4 C10H5F17O3S 2.00 2.0
NEtFOSAA NEtFOSAA 2991-50-6 C12H8F17NO4S 2.00 2.0
NEtPFOSA NEtPFOSA 4151-50-2 C10H6F17NO2S NA3 2.0
NEtPFOSAE NEtPFOSAE 1691-99-2 C12H10F17NO3S NA3 2.0
NMeFOSAA NMeFOSAA 2355-31-9 C11H6F17NO4S 2.00 2.0
NMePFOSA NMePFOSA 31506-32-8 C9H4F17NO2S NA3 2.0
NMePFOSAE NMePFOSAE 24448-09-7 C11H8F17NO3S NA3 2.0
PFDOS Perfluorododecanesulfonic acid 79780-39-5 C12HF25O3S 0.200 0.9
PFHxDA Perfluorohexadecanoic acid 67905-19-5 C16HF31O2 0.200 0.6
PFODA Perfluorooctadecanoic acid 16517-11-6 C18HF35O2 0.200 0.6
PFOSA Perfluorooctanesulfonamide 754-91-6 C8H2F17NO2S 0.200 0.6
Notes:
PQLs are as of March 31, 2019
EPA - Environmental Protection Agency
ng/g - nanograms per gram
PFAS - per- and polyfluoroalkyl substances
PQL - practical quantitation limit
SOP - Standard Operating Procedure
TBD - PQL is to be determined
NA1 - no CAS number assigned
NA2 - Eurofins Lancaster uses EPA Method 537 Mod for these analytes. See EPA Method 537 Mod list for the associated PQL.
NA3 - Table 3+ Method is used by TestAmerica for these analytes. See Table 3+ list for the associated PQL.
*Depending on the laboratory, HFPO-DA may also appear on the EPA Method 537 Mod analyte list
Chemical Formula Soil/Sediment (ng/g)
Table 3+ Lab SOP
EPA Method 537 Mod
Analytical Method Common Name Chemical Name CASN
August 2019
Table 2Description of Sampling LocationsChemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, PCSampling MethodTarget ConcentrationsSedimentCFR-RM-20Co-located with Mile 20 surface water sample collected June 2018; representative of background conditions; near USGS Stream Gage 02102500 and Harnett County's drinking water intake.Grab Background 3 samplesCFR-RM-52Co-located with Mile 52 surface water sample collected June 2018; representative of background conditions; near Fayetteville's drinking water intake.Grab Background 3 samplesCFR-RM-76.2Co-located with CFR-05 surface water samples collected Sept 2017 and May 2018; adjacent to Site.Grab Site 3 samplesCFR-RM-77.25 Located downstream of Outfall 002, immediately upstream of dam. Grab Site 3 samplesCFR-RM-84Co-located with Mile 84 surface water sample collected June 2018; downstream of Site; highest concentrations of HFPO-DA, PFECA, and PFESA detected during June 2018 surface water sampling event. Locate upstream and within 1000 ft of Blden Bluff Drinking Water Intake (RM 84.8).Grab Downstream 3 samplesCFR-RM-100Co-located with Mile 100 surface water sample collected June 2018; downstream of Site.Grab Downstream 3 samplesCFR-RM-116Co-located with Mile 116 surface water sample collected June 2018; downstream of Site.Grab Downstream 3 samplesCFR-RM-132Co-located Mile 132 surface water samples collected June 2018; HFPO-DA was ND June 2018.Grab Downstream 3 samplesNotesSample identifications (IDs) refer to locations identified in Figure 1. Sample IDs are abbreviations, full sample IDs are provided in text. Sample IdentificationCo-located Sediment Sample Location DescriptionSample CategoryAugust 2019
Table 3 Sampling Containers, Preservation, and Holding TimesChemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, PCTestAmerica Eurofins LancasterPFOS/PFOA Compounds EPA Method 537 Mod 250 mL HDPE 100 g Homogenized 2 Cool to 4ºC± 2ºC14 days to extraction, 40 days to analysis14 days to extraction, 28 days to analysisSite-associated Compounds Table 3+ Lab SOP 250 mL HDPE 100 g Homogenized 1 Cool to 4ºC± 2ºC 28 Days 14 daysTotal Organic Carbon Lloyd Kahn 4 oz glass 50 mg Homogenized 1 Cool to 4ºC± 2ºC 28 Days 28 DaysGrainsize Distribution ASTM D422; D7928 16 oz glass fill containerHomogenized 1 NoneSample to be sent to TA BurlingtonSample to be sent to TA BurlingtonMoisture Content ASTM D2216 2 oz glass fill container Homogenized 1 NoneSample to be sent to TA BurlingtonSample to be sent to TA BurlingtonArchived for potential future analysesTBD 250 mL HDPE fill container Homogenized 2 Cool to 4ºC± 2ºC TBD TBDArchived for potential future analysesTBD 4 oz glass fill container Homogenized 4 Cool to 4ºC± 2ºC TBD TBDNotes:HDPE - high density polyethyleneSOP - Standard Operating ProcedureN/A - not applicableMatrix AnalysisSample Volume or Mass RequiredSedimentHolding Times PreservationNumber of ContainersContainer Type and VolumeAnalytical Method Field PrepAugust 2019
Table 4Quality Assurance/Quality Control Samples Chemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, PCInvestigative SamplesEquipment Blank Trip Blank Field BlankField DuplicateMethod Blank Matrix SpikeLab ReplicateLab Control SampleIsotope Dilution AnalytesContinuing Calibration Verification(per event) (per day) (per shipment) (per day) (per 20 samples)(per sample group)(per sample group)(per sample group)(per sample group)(every sample)(beginning of each group)EPA Method 537 Mod2411111111321Table 3+ Lab SOP2411111111N/A1Notes:N/A - none available at presentSOP - Standard Operating ProcedureSedimentAnalytical MethodLabFieldMatrixAugust 2019
Table 5
Criteria for Achieving Data Quality Objectives
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants NC, PC
Category Data Quality Objective Sediment Criteria
Field Duplicate RPD (%) 40*
Lab Replicate RPD (%) 30*
MS % Recovery 70-130
LCS % Recovery 70-130
Isotope Dilution Analyte %
Recovery 25-150
Calibration CCV % Difference 70-130
Completeness % Complete 90
Notes
* RPD criteria apply if result is within a factor of five of the reporting limit.
Criteria may be replaced by statistical limits generated by the laboratory(ies).
CCV - continuing calibration verification
LCS - laboratory control sample
MS - matrix spike
RPD - relative percent difference
Precision
Accuracy
August 2019
Cape Fear Lockand Dam #1 /Kings Bluff Intake Canal
ChemoursFayettevilleWorks
Start ofCape FearRiver
USGS Gauge02102500
USGS Gauge02105769
USGS Gauge02104000
USGS Gauge02105500
CFR-RM-20
CFR-RM-52
CFR-RM-84
CFR-RM-100
CFR-RM-116
CFR-RM-132
Proposed Sampling Transect Locations
Chemours Fayetteville Works, North Carolina
Figure
1Raleigh
8 0 84 Miles
Path: P:\PRJ\Projects\TR0795 - Confidential\Database and GIS\GIS\Sediment Characterization Workplan\TR0726_Confidential_SedimentSampleLocations.mxd; SSomnarain; 08/15/2019August 2019
Notes:1. Sample IDs shown here are abbreviations, see Characterization Plan for full sample IDs.2. Basemap source provided by ESRI OpenStreetMapcontributors, and the GIS User Community
Legend
Sampling Transect
USGS Stream Gauge
Site Features
Chemours Fayetteville Works
Cape Fear River
Outfall 002
W.O. Huske Dam
Willis CreekMouth
Site RiverWater Intake
Old Outfall Channel Mouth
Georgia Branch Creek Mouth
CFR-RM-76.2
CFR-RM-77.25
0 10.5 Miles
USGS Gauge02102500 CFR-RM-20
Conceptual Layout of Transect Sampling Location
Chemours Fayetteville Works, North Carolina
Figure
2Raleigh
300 0 300150 Feet
Path: P:\PRJ\Projects\TR0795 - Confidential\Database and GIS\GIS\Sediment Characterization Workplan\TR0726_Confidential_ConceptualSedimentTranset.mxd; SSomnarain; 08/15/2019August 2019
Notes:1. Sample IDs shown here are abbreviations, see Characterization Plan for full sample IDs.2. Basemap source provided by ESRI OpenStreetMapcontributors, and the GIS User Community
Legend
USGS Stream Gauge
Conceptual Sampling Location in Transect
Chemours Fayetteville Works
CFR-RM-20
0 105 Miles
CapeFearRiver