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![Page 1: 1 ITRC Internet-based training and Technical and Regulatory Guidance Incorporating Bioavailability Considerations into the Evaluation of Contaminated Sediment.](https://reader036.fdocuments.us/reader036/viewer/2022070415/5697bff41a28abf838cbd340/html5/thumbnails/1.jpg)
1
ITRC Internet-based training and Technical and Regulatory Guidance
Incorporating Bioavailability Considerations into the Evaluation of Contaminated
Sediment Sites (CS-1, 2011)
Welcome – Thanks for joining this ITRC Training Class
Sponsored by: Interstate Technology and Regulatory Council (www.itrcweb.org) Hosted by: US EPA Clean Up Information Network (www.cluin.org)
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2
Housekeeping
Course time is 2¼ hours Question & Answer breaks
• Phone - unmute #6 to ask question out loud; *6 mute
• Simulcast - ? icon at top to type in a question
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Copyright 2014 Interstate Technology & Regulatory Council, 50 F Street, NW, Suite 350, Washington, DC 20001
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3ITRC (www.itrcweb.org) – Shaping the Future of Regulatory Acceptance
Host organization Network
• State regulators All 50 states, PR, DC
• Federal partners
• ITRC Industry Affiliates Program
• Academia• Community stakeholders
Disclaimer
• Full version in “Notes” section
• Partially funded by the U.S. government
ITRC nor US government warrantee material
ITRC nor US government endorse specific products
• ITRC materials copyrighted
Available from www.itrcweb.org
• Technical and regulatory guidance documents
• Internet-based and classroom training schedule
• More…
DOE DOD EPA
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4
Meet the ITRC Instructors
Greg NeumannNew Jersey Department of
Environmental Protection
Trenton, New Jersey 609-633-1354greg.neumann@
dep.nj.gov
Steve CloughHaley & Aldrich, Inc.Manchester, New Hampshire 603-391-3341sclough@
haleyaldrich.com
Diana MarquezBurns & McDonnell
Engineering CompanyKansas City, [email protected]
John CargillDelaware Department of
Natural Resources and Environmental Control
New Castle, Delaware [email protected]
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5
ITRC Sediments Team
States• Alabama• California• Delaware• Florida• Kentucky • Michigan• New Jersey• New York• Oklahoma• Oregon• Pennsylvania • Texas• Washington
Universities• Purdue• U. of Florida• U of Texas
Federal Agencies• Navy• Army• AFCEE• EPA Including
Region 2 & 5• USACE• DOE
Community Stakeholders
• Mtn Area Land Trust
• AAEJCIndustry
• AMEC • Alta
Environmental• AECOM• AFMC• Alcoa • Arcadis
• Battelle • Beacon• Brown and
Caldwell • Bootheel
LEPC• Burns &
McDonnell• BP • CDM
CH2MHill• CETCO • Columbia
Analytical• DuPont
Geosyntec • EMCBC • Environ • ExxonMobil • Haley &
Aldrich, Inc
• Kleinfelder• Langan
Engineering• LATA-Kemron• Malcolm Pirnie• M.W. Global• MWH • RegTech • Neptune and Co.• SAIC W.L. • Gore• SRNL• Test America
labs• Tetra Tech • URS• WRI• SPAWAR • SSC• Shell
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ITRC Web-based Guidance Outline
Introduction and background on bioavailability
Overview of bioavailability processes
Bioavailability pathway exposure assessment• Screening• Background• Pathway exposure assessment
Benthic invertebrates Fish and water column
invertebrates Wildlife Plants Human health
Risk management decision-making
http://www.itrcweb.org/contseds-bioavailability/
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7
What You Will Learn…
What is bioavailability? When do we apply bioavailability
adjustments? What are the available tools and how do we
use them? How do we use the information to make risk
management decisions? You will NOT learn how to conduct a Risk
Assessment that incorporates bioavailability.
The intended users of this guidance are individuals who have a working knowledge of contaminated sediment management but seek additional information about bioavailability.
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The Problem!
US EPA reports – 10% (1.2 billion yds3) of U.S. sediment underlying surface water pose a potential ecological or human health risk
Cost of clean-up is in the trillions Contaminant concentration in
sediment and actual exposure is not a direct relationship
Bioavailability will give a more accurate characterization of exposure
USACE 2008. Technical Guidelines for Environmental Dredging of
Contaminated Sediments
Conventional Clamshell
Excavator
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What is Bioavailability?
“…individual physical, chemical, and biological interactions that determine the exposure of plants
and animals to chemicals associated with soils and sediment (National Research Council, 2003).”
Specifically, bioavailability addresses the fact that only a fraction of the contaminant concentration present in the environment may be taken up or
result in an effect on an organism!
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10How can Bioavailability Make a Difference?
If contaminants are not physically accessible, or chemically or biologically available, they should not be included in the calculation of risk
Can optimize the extent of cleanup required to be protective
Can provide optimization of remedial approach and cost
Can be an important factor in balancing the risks caused by remedial action
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How is Bioavailability Being Used?
2008 – ITRC Team distributed questionnaire to assess extent bioavailability was used for the development of site cleanup levels
35 case studies collected (Table 9-1 and Appendix D)• Summarized exposure
pathways addressed
• Summarized contaminants evaluated/addressed
• Summarized tools used at each site
• Includes contacts for more information about each site
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Questionnaire Results
Most common exposure pathways evaluated• Benthic exposure
• Human health
• Pelagic exposure Most common tools used to assess bioavailability
• Bulk sediment chemistry
• Tissue sampling (fish, bivalves, other water column receptors)
• Porewater chemistry
• Bioassays of benthic invertebrates
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13Risk Management Role in Decision-Making
Risk management integrates the results of the risk assessment with• Technical
• Political
• Legal
• Social
• Economic objectives
Bioavailability is used to make risk management decisions within the• Risk assessment - Section 9.1
• Remedy selection – Section 9.2, Table 9-2
• Remedial design/Implementation – Section 9.2
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14
Risk Assessment
The assessment of risk to all receptors identified at a contaminated sediment site related to
physical, chemical, and biological processes!
Bioavailability should be used to actively refine conceptual site model (CSM)
Risk assessment will likely involve a “weight of evidence” approach, or “multiple line of evidence” approach• Be aware of sources of variation in
risk assessments• Collect data essential to risk assessment• Analyze to understand exposure and risk• Remember: bioavailability is highly site
specific Be aware of your stakeholder interests,
and communicate with them regularly View ITRC’s Use of Risk Assessment in
Management of Contaminated Sites (Risk-2, 2008) – available from www.itrcweb.org
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Risk Assessment & Bioavailability
Advantages• If contaminants aren’t bioavailable, then they aren’t included
in the evaluation of risk (no exposure)
• Optimization of cleanup goals, with a possible cost reduction
• More effective use of available resources
• Can achieve more accurate defensible cleanup goals while ensuring protection of receptors
Challenges• Uncertain acceptance by regulators, stakeholders, and the
public
• Bioavailability may vary across a site (or operational units)
• Potentially higher site characterization costs
• May take longer to gain full understanding of site conditions
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Remedy Selection
Bioavailability evaluation within risk assessment process will result in selection of remedy that will better address concerns at site
Example: Mocks Pond Case Study• Site history and bulk sediment testing identified
contaminants of potential concern (COPCs) • Further evaluated using bioavailability tools
In-situ pore water metal concentrations Chemical analyses of whole body and fillets of pelagic fish
species
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Remedial Design and Implementation
Risk mitigation, reduction, or removal is ultimate goal of every remedial action
If bioavailability indicates adverse impact to receptors, then design the remedy accordingly
Bioavailability measurement tools can be used to monitor effectiveness of remedy
Reduction in uncertaintywill enhance ability to evaluate monitored natural recovery
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18
Limitations and Uncertainty
There are uncertainties with data assessment methods and models
Aquatic environments are dynamic, which may alter physical, chemical and biological properties, and therefore bioavailability factors, through time
Stakeholder interests and land usage at or surrounding a site can change over time, thus shifting remedial priorities
Regulatory acceptance cannot be assumed
Just remember . . . Collect data that answers a question about the site Knowing your site and good communication is the key
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19Contaminated Sediment Assessment Approach
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20
Scoping Your Site….Chapter 2
Site history - Due Diligence Site boundaries (extent of
contamination) Contaminants of potential
concern (COPC) Conceptual site model
(CSM) – source, exposure pathway/route, receptors, space, time, fate & transport
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21Processes to Consider During Scoping
Physical• Bed Transport• Deposition/ Resuspension• Bioturbation• Advection/diffusion• Grain size COPC distribution• Burial• Temperature
Chemical• Sorption/desorption • Transformation/
degradation• Geochemical (TOC,
salinity, pH, Redox)
Caution – Sediment are mixtures
Biological• Uptake• Biotransformation• Bioaccumulation• Mode of action• Critical body burden
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22Example Conceptual Site ModelAnacostia River
FlowDirection Resuspension
Deposition
Tidal Mixing/ Potomac River Surface Water
Suspended Particles
AdsorptionDesorption
Urban Tributaries
• Storm Water• Sewer• Water Treatment
Plant• CSO
Permitted Facility
Discharge
Uncharacterized Point
Discharges
Volatilization Precipitation
Groundwater Recharge
Deep SedimentGroundwater Discharge
BurialEpifauna InfaunaSurface Sediment
Non-Point Surface Run-off
Erosion
Dissolution FlowDirection
Bed Load Transport
Bioaccumulation
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23
Screening Your Site…Chapter 3
Screening values (e.g. SQVs) are not site specific Conservative values
• Levels below which there is a good probability there is low risk
• Values above screening levels do not imply unacceptable level of risk
Determine if there is a need for further investigation
Do not use as clean up levels/PRGs
Many SQVs have been established Beware – know how your
screening levels were derived! (e.g. McDonald 2000 “consensus” values)
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24
Screening and Bioavailability
Source: NRC, 2003
Normalization of bulk sediments (section 3.1.2.2) can be applied within the screening process under some state regulatory programs (e.g. TOC for PAHs/EqP; iron, aluminum for metals)
However the assessment of site impacts is improved by incorporating bioavailability in later stages of the site investigation using site specific considerations
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Specific Exposure Pathways
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Most Common Exposure Pathways
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Benthic Pathway…Chapter 4
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28
Sediment Quality Triad (SQT):
Procedures for Assessing Bioavailability to Benthic Invertebrates
Chemistry(bulk sediment and pore water concentration)
Toxicity(solid phase;
extract/leachate; bioaccumulation)
Biology(macroinvertebrate abundance,
diversity, benthic indices, body burden)
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SEM/AVS• Simultaneously
Extracted Metals/ Acid Volatile Sulfides
SEM-AVS/fOC
From EPA-600-R-02-011, 2005
No Toxicity
Toxicity Uncertain
Toxicity Probable
Tools to Assess the Benthic Pathway; Chemical - Sediment
130 3000
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30Tools to Assess the Benthic Pathway; Chemical - Porewater
Porewater (Direct)• Centrifugation (lab)• Syringes/suction devices• Piezometers• Ultraseep/Trident probe• SPME (solid phase
microextraction; EPA SW-846 8272; ASTM D73-63-07)
Porewater (Indirect)• Peeper• SPMD (semi-permeable
membrane device) / dialysis bags
• Diffusion in thin films (DGT)• SPME, POM
(Polyoxymethylene) film, PE (Polyethylene) strips
• GORE® Module• Diffusive flux
Surface Water
Oligochate
Sediment Surface
Sediment Particles
Porespace filled with water
(porewater)
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31Tools to Assess the Benthic Pathway; Chemical - Porewater (Direct) – Suction Devices
Airstone “Before” Airstone “After”
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32Tools to Assess the Benthic Pathway; Chemical - Porewater (Indirect) – SPMD/Dialysis Bags
SPMD “Before” SPMD “After”
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33Tools to Assess the Benthic Pathway; Chemical - Porewater (Indirect) – “Peepers”
Clear acrylic body
Cell
Lexane wedge
Membrane
Assembled Sampler components
Base plateDialysis
membrane Cover
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34Tools to Assess the Benthic Pathway; Chemical - Porewater (Indirect) – “Peepers”
Photographs courtesy of A. Lee Gustafson, Net Zero LLC
Depth (cm)
40
20
0
-20
-40
-60
-80
Arsenic (mg/L)
SouthCentralNorth
0 1 2 3 4 5 6
Water column
Black ooze
Tan medium sand
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35 Tools to Assess the Benthic Pathway; Chemical - Porewater (Direct) – Trident Probe and Ultraseep
Ultraseep*
Trident Probe*
*http://www.oceanscience.com/pdf/ultraseep_trident.pdf
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36 Tools to Assess the Benthic Pathway; Chemical - Porewater (Direct/Indirect) – SPME (Solid Phase Micro Extraction)
Sample Vial
Syringe
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37Tools to Assess the Benthic Pathway; Chemical - Porewater (Indirect) – GORE® Module
Screening tool that can be used to sample porewater Measure concentrations in
GORE lab only Verified use in groundwater Mainly effective for VOCs
To SurfaceCord attached to float or insertion probe
Water and soil particles remain outside
Organic vapors pass through
Multiple sorbents in sample
GORE-TEX membrane
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38Tools to Assess the Benthic Pathway; Biological - Sediment Toxicity Tests
Neanthes arenaceodentata
Chironomus dilutus
Hyalella azteca
Eohaustorius estuarius
FRESHWATERBRACKISH ORSALTWATER
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39Tools to Assess the Benthic Pathway; Biological - Macroinvertebrate Surveys
“Pollution Sensitive” “Pollution Tolerant”
Benthic Metrics: Abundance, Richness, %EPT, %Dominance, %Chironomids, Hilsenhoff’s or Shannon-Weiner Diversity Indices
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40Tools to Assess the Benthic Pathway; Biological - Minimally Disturbed Stream
Photos courtesy of Susan Davies, Maine DEP
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41Tools to Assess the Benthic Pathway; Biological - Stream Adjacent to Shopping Mall
Photos courtesy of Susan Davies, Maine DEP
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42Tools to Assess the Benthic Pathway Predictive
Equilibrium partitioning
Sediment – Pore Water Exposure
Biota
SedimentCarbon
PoreWater
Equilibrium partitioning Narcosis model SEM-AVS/fOC
Biotic ligand model
Biotic Ligand Model
Organic Matter Complexation
Inorganic Ligand Complexation
Site of Action
Competing Cations
M-DOC
Ca2+
Na+
H
M2+ M-BioticLigand
Free Metal IonMOH+
MHCO3+
MCl+Tipping, 1994
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43Case Study Using the Benthic Pathway Tectronix Wetlands Beaverton, OR
Historic operations → sediment metals exceeding Oregon Department of Environmental Quality (DEQ) Level II screening level values• Assessed chemistry, toxicity, SEM/AVS,TOC
Maximum (SEM-AVS)/foc was ~10 less than EPA’s adverse effect level
• Toxicity tests Hyalella azteca mortality Chironomus dilutus growth No adverse effect on amphipods or midges
Assessment concluded concentrations did not pose potential risks to benthic community
NFA for stretch of Beaverton Creek based on• Results from bulk sediment chemistry• Toxicity testing• Comparison to (∑SEM-AVS)/fOC toxicity
threshold
Photo courtesy Kathleen Hurley
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44
Questions & Answers
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45Fish and Water Column Invertebrates Pathway…Chapter 5
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46Tools to Assess the Fish and Water Column Invertebrates Pathway Chemical
Measure water quality above sediment bed → compare to • National recommended water quality concentration
• State water quality standards Measure water and tissue residues → compare to
• Bioaccumulation Factors (BAF)
• Critical Body Burden (CBB): ~2.5 umol/g wet weight
• Toxicity Reference Values (TRV) Measure Biota-sediment accumulation factors (BSAFs) =
[COPCtissue/flipid] / [COPCsed/fOC]
• <1 or >1?
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47Tools to Assess the Fish and Water Column Invertebrates Pathway Biological
Conduct sediment toxicity tests using appropriate organisms and conditions
Measure in situ bioavailability from field-collected organisms
Conduct population surveys → compare to “reference” conditions
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48Tools to Assess the Fish and Water Column Invertebrates Pathway Predictive
Accumulation factors• Bioconcentration factors
USEPA EPISuite
• Bioaccumulation factors Public domain Peer-reviewed literature
• Biota-sediment accumulation factors e.g. U.S. Army Corp of Eng or ORD BSAF Dbase
• Biomagnification factors Biotic ligand model (metals) Food web models
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49Case Study Using the Fish and Water Column Invertebrates Pathway
McCormick and Baxter Superfund Site, OR Residual creosote-derived contaminants including PAHs and
dioxins Assessments
• Sediment chemistry• Bioassays• Tissue residues in fish and crayfish• Fish histopathology
Results• Sediment chemistry and toxicity testing
Indicated area of the Willamette River - likely to be toxic• Tissue residues for PAHs were low in
Crayfish (Pacifastacus leniusculus) Large scale sucker (Catastomus macrocheilus) Examination of 249 fish livers found no statistical differences
between the site and upstream locations ROD required placement of an impermeable cap, based on
• Sediment chemistry and bioassay data• Continuing NAPL discharges from sediments to Willamette River
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50
Wildlife Pathway…Chapter 6
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51
Freshwater (Mallard) Saltwater (Sandpiper)
CSED (mg/kg) x %diet (kg/day) = mg/kg/day
Dose (mg/kg/day) = % Sediment (in diet)
Tools to Assess the Wildlife Pathway: Indirect Measures
Wildlife effects (already known)• Bulk sediment
(mg/kg)• Literature BAFs• Percent of diet
Calculate: dose (mg/kg/day) Compare: to threshold reference value (TRV) Pass?
• Yes → NFA• No → SLERA/BERA
Exposure/effect: bioaccessibility in sediment
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52Tools to Assess the Wildlife Pathway; Indirect Measures
Photo courtesy of Nick Basta, Soil & Envir. Chemistry, Ohio State Univ.
Furman et al., J. Environ. Qual. 35: p. 450 https://www.soils.org/publications/ jeq/articles/36/3/899
Blood Pb (mg kg-1, wet weight)
0 21 643 5 7
4
3
2
1
0
logW
-PB
ET
giz
zard
Pb
(mg
kg-1)
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53Tools to Assess the Wildlife Pathway;Direct Measures
Tissue residue analysis• Need clear endpoints
Toxicity testing• Expensive but site-
specific Food web modeling
• Simple vs. complex Population surveys
• Consider scale vs. home range
13.8 ppm
2.07 ppm
0.23 ppm
0.04 ppm
Tertiary consumers
Secondary consumers
Primary consumers
Producers
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54
Plants Pathway…Chapter 7
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55
Tools to Assess the Plants Pathway
Bioassay (e.g. seedlings) Bioaccumulation (vegetative) Plant toxicity (e.g. boron)
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56
Human Health Pathway…Chapter 8
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57
Exposure in Human Health Pathway
Direct contact with sediment• Ingestion
• Dermal contact
Consumption • Fish
• Wildlife
• Plant
Incidental Sediment Ingestion
Aquatic Vegetation
Soil/Groundwater Sediment
Pore Water
Benthic Organisms
Surface Water
Fish
Water Fowl
Fish & Wildlife Ingestion
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58
Direct Contact
Preliminary screening • Compare bulk sediment concentrations to human health-
based soil screening levels (SSLs) Refine screening levels
• Modify exposure variables
• Modify bioavailability assumptions Adherence of sediments to skin Dermal absorption efficiency Gastrointestinal absorption efficiency
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59Human Consumption of Fish and Shellfish
Contaminants of concern• Primarily concerned with bioaccumulative constituents
• In general bioaccumulation concerns should be limited to select classes of organics (pesticides, PCBs, dioxins) and mercury
Adjust screening levels• Contaminant concentration available in sediment pore water
(Section 4)
• Site specific conditions such as TOC or fish lipid fraction
Direct tissue analysis
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60Human Consumption of Fish and Shellfish
Adjust screening levels – example (Text Box 8-1)• Recreational human fisherman screening level =
0.019 mg/kg for hexachlorobenzene (HCB) Default values for fish lipid fraction = 0.03 Sediment fraction organic carbon (foc) = 0.01
• Site-specific screening level = 0.28 mg/kg Used site-specific fish lipid fraction of 0.02 and foc
of 0.10
• Applying site-specific information raises screening value 15x
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61Human Consumption of Wildlife and Plants
Wildlife • Incidental ingestion of sediment, aquatic
vegetation and benthic and/or pelagic organisms• Obtain information on dietary habits of species of
concern• Addressed in Chapter 6
Plants• Grown in contaminated area (e.g. seaweed, wild
rice) or crops in dredge spoils• Tissue sampling to determine COPCs• Addressed in Chapter 7
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62Case Study – Industri-plex Superfund Site
Once nation’s leading producer of lead arsenate
2-step study of arsenic in river sediments • Step 1 – Narrow focus for live tests
In vitro test on river sediments from four areas
Sediments in reactor that simulates the stomach fluid of humans
• Step 2 – Test relative bioavailability to humans
Tested two sets of river sediment materials Immature swine fed dough balls with
sediment test materials RBA of the site sediments were 37% and
51%, respectively
Study reduced the estimated human health risk in half
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63
Case Study Using Bioavailability
Indiana Steel and Wire Site - Mocks Pond
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64
Site Description and Background
Galvanizing plant, Muncie, Indiana 2.8 acre former limestone quarry
• Received plant production wastewater from 1962-1973
• Lime was added to neutralize wastewater before discharge to pond
• Pond contained 51,000 cubic yards of stabilized spent pickling sludge
• Sediment samples contained high concentrations Heavy metals (Sb, As, Cd, Cr, Cu, Pb, and Zn) Cyanide
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65
Site Characterization Efforts
Sediment and surface water investigations• Sediment toxicity and leachability studies (1980’s)• Waste characterization study (1993)• Standard bulk chemistry sediment and surface
water sampling for metals and cyanide (1999) Biological assessment
• Water column properties assessment including plankton type
• Macroinvertebrate and fish surveys
• Fish tissue sampling for metals and cyanide
• Wildlife surveys
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66Site Characterization Results: Surface Water and Sediment
Physical nature of the sludge not conducive to benthic organisms• Fine grained• No organic matter/nutrients
Neutralization of the wastewater discharge with lime forming insoluble metal hydroxides suggested lack of metals bioavailability
Preliminary surface water sampling results in compliance with water quality standards
Sediment results exceed sediment screening criteria (SSC)
Concentration SSC
Cr 21 - 2,100 ppm 120 ppm
Cu 150 - 6,210 ppm 100 ppm
Pb 201 - 8,000 ppm 82 ppm
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67Site Characterization Results: Biological Assessment
Healthy populations• Present
Pelagic fish Phytoplankton Zooplankton species
• Absent Benthic fish Macroinvertebrates
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68Bioavailability Investigation Activities: Human Health Risk Assessment
Screened sediment and fish data • Indiana Tier II residential cleanup goals for soil
• EPA Region III Residential RBCs for fish tissue COPECs in sediment: Sb, Cr, Pb and Zn Fish tissue: As Exposure routes
• Incidental ingestion
• Dermal contact
• Ingestion of fish Receptors
• Future construction workers
• Park worker and recreational visitors
• Anglers
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69Bioavailability Investigation Activities: Human Health Risk Assessment (continued)
Used exposure modeling to determine risk • IEUBK model for Pb
• Intake modeling for other metals
Conclusion: Remediation of pond sediment is necessary to address direct contact issues with Pb in sediment to the future construction worker and ingestion of arsenic in fish tissue for future recreational anglers.
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70Bioavailability Investigation Activities: Ecological Risk Assessment
Screened sediment and fish tissue data• Sediment criteria
Assessment and Remediation of Contaminated Sediments (ARCS) Program for the Great Lakes Threshold Effects Levels (TELs)
Lowest Effects Levels (LELs) (Persuad, 1993) Washington State Lowest
Apparent Effects Thresholds (LAETs)
• Fish tissue criteria Compared to background
concentrations from White River
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71Bioavailability Investigation Activities: Ecological Risk Assessment (continued)
Sediment COPCs• Sb, As, Cd, Cr, Cu, Pb, Hg,
Ni, Ag, Zn and cyanide Fish tissue COPCs
• None (concentrations less than background)
Exposure routes• Incidental ingestion
• Dermal contact
• Ingestion of fish
Receptors• Benthic invertebrate
• Piscivorous birds
• Piscivorous mammals Used dietary exposure
modeling to determine risk to higher trophic level organisms
Conclusion: Considerable level of risk exist to benthic organisms, benthic fish and submerged and emergent aquatic macrophytes from sediment exposures due to levels of metals in sediment and the absence of these feeding guilds in the pond
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72Remedial Design: Sediment Excavation and Capping
Dredging sediment to clear water depth of 10 feet
Placement of a geotextile fabric liner followed by a subaqueous fine to medium grain sand cap atop the residual sediment
Post-construction monitoring (borings/bathymetry)
Five years of annual post-remedial monitoring to evaluate cap performance in restricting the migration of constituents into the biotic zone
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735 Year Post-Remedial Monitoring and Bioavailability Testing
5 Year Annual Monitoring Plan Pore water sampling to evaluate cap performance
• In situ sampling via large diameter peepers
• Inserted 10 centimeters into the sediment Surface water sampling to assess
functional effects on the water column community
Sediment sampling to confirm isolation of metal contamination
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74Post-Remedial Monitoring/ Bioavailability Investigation Findings
Post-Construction Monitoring Results Cap performed in accordance with design
• Uniformly overlies pond bottom
• Physically stable
• Effectively isolating the residual underlying sediment
5 Yr Annual Monitoring Results Sediment, surface water and pore water quality met
site-specific standards• Metals tightly sequestered
• Metals not biologically available
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75Sediment Quality Improvements and Case Study Summary
Constituent
Initial Concentration Range (1999)
Post-Remedial Concentrations
(at 5th Year)
Sediment Cleanup Standard
(mg/kg) (mg/kg) (mg/kg)
Antimony 36 to 315 0.034 to 0.11B 64
Arsenic 8.9 to 18 2.2 to 6.7 48
Cadmium 1.3 to 12 0.13 to 0.39 3.2
Chromium 21 to 2,100 ND 120
Copper 150 to 6,210 5.9 to 80.4 100
Lead 201 to 8,000 4.6 to 63.8 82
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76
Overall Course Summary
Bioavailability should be an integral part of characterization and remedial decision making
Bioavailability can be assessed throughout the process but is more justifiable after the initial screening process
Bioavailability will help you refine your exposure results and refine your risk management decisions
See also: ITRC’s Remedy Selection for Contaminated Sediments
http://www.itrcweb.org/contseds_remedy-selection/
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77
Thank You for Participating
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