sediment assessment & management for dam removal projects joe rathbun michigan dept. of...
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SEDIMENT ASSESSMENT & SEDIMENT ASSESSMENT & MANAGEMENT FOR DAM MANAGEMENT FOR DAM
REMOVAL PROJECTSREMOVAL PROJECTS
Joe RathbunJoe RathbunMichigan Dept. of Environmental QualityMichigan Dept. of Environmental Quality
Water BureauWater Bureau517-373-8868517-373-8868
[email protected]@michigan.gov
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OutlineOutlineBasic ConceptsBasic Concepts
Sample CollectionSample Collection– Survey designSurvey design– Grab and core samplingGrab and core sampling
Effects AssessmentEffects Assessment– ToxicityToxicity– BioaccumulationBioaccumulation– Sediment quality criteriaSediment quality criteria
Sediment Management OptionsSediment Management Options
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Sediment Assessment Framework
Reconnaissance and/or definitive survey
SQC exceeded
Analyze transport capacity & downstream sensitivity
Low transport capacity
High transport capacity
Not bioavailable Bioavailable
Initial screening indicates sediment contamination likely
SQC not exceeded
(Optional)
Sediment ManagementFramework
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Sediment Management Framework
Fullremoval
Partialremoval
Cap or isolate
Natural erosion& deposition
Stagedremoval
Low transport capacity and/or
high d/s sensitivity
High transport capacity and/or
low d/s sensitivity
Not bioavailable Bioavailable
(Optional)
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Basic Concepts: Basic Concepts: Sediment TransportSediment Transport
Rivers do 2 things very wellRivers do 2 things very well
–Move Move waterwater
–Move Move sedimentsediment
Most sediment transported during Most sediment transported during floodsfloods
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Basic Concepts: Reservoirs are Basic Concepts: Reservoirs are Sediment TrapsSediment Traps
Many trap Many trap 95 %95 % of the sediment of the sediment that enters them from upstreamthat enters them from upstream
LargeLarge sediment particles form sediment particles form deltas at upstream enddeltas at upstream end
SmallSmall sediment particles sediment particles transported farther into reservoirtransported farther into reservoir
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Basic Concepts: Issues with Basic Concepts: Issues with Contaminated SedimentsContaminated Sediments
Direct Direct toxicitytoxicity to organisms to organisms– AcuteAcute– ChronicChronic
BioaccumulationBioaccumulation in organisms in organisms
Alter Alter benthic communitybenthic community
Contaminate overlying Contaminate overlying waterwater
Affect disposal of Affect disposal of dredged materialdredged material
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Basic Concepts: Basic Concepts: Contaminant DistributionContaminant Distribution
↓↓ grain size = grain size = ↑↑ contaminant contaminant concentrationconcentration– Silt = Silt = ↑↑ TOC, for organics (& metals) TOC, for organics (& metals)
– Clay = Clay = ↑↑ binding sites for metals binding sites for metals
Grain size distribution “predictable”Grain size distribution “predictable”– Upper impoundment = large particlesUpper impoundment = large particles– Lower impoundment = finesLower impoundment = fines
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Organic Contaminants:Organic Contaminants:Sediment vs. Water Sediment vs. Water
ConcentrationsConcentrations
Depending on contaminant Depending on contaminant polarity, solubility, etc. …polarity, solubility, etc. …
Sediment > water by factor of Sediment > water by factor of 1,0001,000 to to 10,000,00010,000,000
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Almost always have to sample…Almost always have to sample…
Because of unexpected historic Because of unexpected historic contaminant sources:contaminant sources:
Brick factories Brick factories = Cd, Pb, Ni, Ba, Se, Co= Cd, Pb, Ni, Ba, Se, Co
Orchards & tobacco fieldsOrchards & tobacco fields = As, Hg = As, Hg
TanneriesTanneries = Cd, Cr, As, Hg = Cd, Cr, As, Hg
Coal gasification plantsCoal gasification plants = PAHs, metals = PAHs, metals
Glass factoriesGlass factories = As, other metals = As, other metals
CemeteriesCemeteries = Pb, As, Hg = Pb, As, Hg
Dye manufacturersDye manufacturers = metals = metals
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Sampling Survey DesignSampling Survey Design
First step in samplingFirst step in sampling
Extremely important to data qualityExtremely important to data quality
Sediment quality data are easy to Sediment quality data are easy to collect but difficult to interpret unless collect but difficult to interpret unless obtained using a well-designed surveyobtained using a well-designed survey
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Sampling Survey Design:Sampling Survey Design:Field vs. Lab HeterogeneityField vs. Lab Heterogeneity
Sources of data variabilitySources of data variability– In-situIn-situ heterogeneity, in the field heterogeneity, in the field– CollectionCollection biases & inaccuracies biases & inaccuracies– LabLab biases & inaccuracies biases & inaccuracies
PCBs in soil (EPA, 1992):PCBs in soil (EPA, 1992):– Lab = < 1 % of data variabilityLab = < 1 % of data variability– Location of sample = 92 % of data Location of sample = 92 % of data
variabilityvariability
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Simplest Case:Simplest Case:Small Dam…Rural Area…No MoneySmall Dam…Rural Area…No Money
Minimum data required:Minimum data required:
Demonstrate Demonstrate lack of upstream sourceslack of upstream sources
Find siltFind silt deposits & establish thickness deposits & establish thickness
Collect Collect minimal number of samplesminimal number of samples– ≥ ≥ 1 from each silt deposit, & combine?1 from each silt deposit, & combine?
Analyze for Analyze for organics & metalsorganics & metals
Compare to Compare to sediment quality criteriasediment quality criteria
Sample benthos?Sample benthos?
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Preferred Survey Design ProcessPreferred Survey Design Process
1.1. Establish Establish study objectivesstudy objectives, evaluate , evaluate existing data, etc.existing data, etc.
2.2. Conduct Conduct reconnaissancereconnaissance surveysurvey
3.3. Refine study objectivesRefine study objectives - Choose minimum number of stations that - Choose minimum number of stations that
are representative of study areaare representative of study area
4.4. Conduct Conduct definitive surveydefinitive survey
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Reconnaissance SurveyReconnaissance Survey
ObjectivesObjectives– Sampling accessSampling access– Sample collectabilitySample collectability– Qualitatively assess nature and extent of Qualitatively assess nature and extent of
contaminated depositscontaminated deposits
EquipmentEquipment– Probing rodProbing rod– Small grab or core samplerSmall grab or core sampler– Equipment for hydrographic surveyEquipment for hydrographic survey– GPSGPS
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Reconn. Survey – Mud Music Reconn. Survey – Mud Music ♫♫
Use Use hollow metal tubehollow metal tube to identify to identify sediment type:sediment type:
RockRock = bounce & clang = bounce & clang
ClayClay = bounce & silent = bounce & silent
GravelGravel = crunch = crunch
SiltSilt = silent, penetration = silent, penetration
SandSand = silent, no penetration = silent, no penetration
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Definitive SurveyDefinitive Survey
ObjectiveObjective
– Quantitatively Quantitatively establish magnitude establish magnitude and extent of contaminationand extent of contamination
EquipmentEquipment
– Grab or core samplersGrab or core samplers
– GPSGPS
Largely the same as reconn…Largely the same as reconn…
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Definitive Survey ComponentsDefinitive Survey Components
– Sampling designSampling design– Sample collection technique(s)Sample collection technique(s)– Sample analysis technique(s)Sample analysis technique(s)– Field and lab QA/QCField and lab QA/QC– Data interpretationData interpretation– Data mapping, volumetric Data mapping, volumetric
calculationscalculations– Modeling (?)Modeling (?)
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Sampling DesignSampling Design
WhatWhat samples will be collected samples will be collected– Whole sedimentWhole sediment– ElutriateElutriate– Pore waterPore water
How manyHow many samples will be collected samples will be collected
WhereWhere samples will be collected samples will be collected
HowHow samples will be collected samples will be collected
((WhenWhen samples will be collected) samples will be collected)
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Sampling Design – How Many?Sampling Design – How Many?
Statistical calculations, with existing Statistical calculations, with existing datadata
n = n = VarianceVariance
MeanMean22 x Precision x Precision22
- Requires historic data set- Requires historic data set
- Really only appropriate for data from a - Really only appropriate for data from a single stationsingle station!!
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Sampling Design – How Many?Sampling Design – How Many?
Calculated ‘n’ is the number of samples Calculated ‘n’ is the number of samples that yields an overall that yields an overall meanmean concentration for the entire study areaconcentration for the entire study area
Sometimes want to identify Sometimes want to identify hot spotshot spots, , not average conditionsnot average conditions
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Sampling Design – How Many?Sampling Design – How Many?
Geostatistical modelsGeostatistical models
Elipgrid-PCElipgrid-PC
– Design of sampling gridsDesign of sampling grids
– Probability of locating “hot spots”Probability of locating “hot spots”
– Hot spot size, shape, orientation, + Hot spot size, shape, orientation, + grid spacing (= number of samples)grid spacing (= number of samples)
http://dqo.pnl.gov/software/elipgrid.htmhttp://dqo.pnl.gov/software/elipgrid.htm
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Elipgrid ExampleElipgrid Example
Canals on Lake St. Clair (MI)Canals on Lake St. Clair (MI)
Surface areaSurface area = 233,000 ft = 233,000 ft22 = 21,700 m = 21,700 m22
- About 6 football fields- About 6 football fields
Square gridSquare grid
95 % confidence95 % confidence
Circular hot spotCircular hot spot
Calculate Calculate how many sampleshow many samples for for different hot spot sizesdifferent hot spot sizes
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Elipgrid ExampleElipgrid Example
Hot Spot Radius (m)Hot Spot Radius (m) # Samples# Samples
11 7,787 7,787
55 312 312
1010 7878
1515 3535
2020 2020
Often not happy with results!Often not happy with results!
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Sampling Design – Where?Sampling Design – Where?
Objective Objective of the studyof the study
Cost-effectivenessCost-effectiveness– Use Elipgrid-PCUse Elipgrid-PC
Patterns of sediment Patterns of sediment contamination contamination variabilityvariability
Practical considerationsPractical considerations– $$$$$$$$$$
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Simple Random SamplingSimple Random Sampling
FlowFlow
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Systematic Grid SamplingSystematic Grid Sampling
FlowFlow
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Subjective SamplingSubjective Sampling
OutfallOutfall
FlowFlow
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Stratified Random SamplingStratified Random Sampling
GravelGravel
BarBar
Silt BarSilt Bar
FlowFlow
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Some Sampling Design Some Sampling Design GuidanceGuidance
Contaminant Contaminant distribution:distribution:
Random & uniformRandom & uniform
Known strataKnown strata
Known hot spotsKnown hot spots
Linear trends, or Linear trends, or mapping importantmapping important
Recommended Recommended strategy:strategy:
Random samplingRandom sampling
Stratified random Stratified random samplingsampling
Subjective samplingSubjective sampling
Systematic grid Systematic grid samplingsampling
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Sample CollectionSample Collection
Grab samplersGrab samplers
Core samplersCore samplers
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Grab SamplingGrab Sampling
More “recent” sedimentsMore “recent” sediments
Mixed, mobile surface layerMixed, mobile surface layer
““Biologically active” zoneBiologically active” zone
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Grab Samplers…Grab Samplers…
Require smaller sampling vesselsRequire smaller sampling vessels
Changing sediment composition = Changing sediment composition = variable variable penetration depthspenetration depths
– Silt > sand > gravel or claySilt > sand > gravel or clay
– Watch for “buried” sampler in soft Watch for “buried” sampler in soft sedimentssediments
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Ekman Grab SamplerEkman Grab Sampler
(Kahl Scientific Co.)(Kahl Scientific Co.)
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Ekman in dugout canoeEkman in dugout canoe
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Ponar samplerPonar sampler
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Ponar Sampling in WhalerPonar Sampling in Whaler
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Van Veen Grab SamplerVan Veen Grab Sampler
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Grab Sampling is Dirty Work!Grab Sampling is Dirty Work!
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Capacity of Grab SamplersCapacity of Grab Samplers
Ekman = Ekman = 3.5 L3.5 L
Petite Ponar = Petite Ponar = 2.4 L 2.4 L
Standard Ponar = Standard Ponar = 8.2 L8.2 L
Van Veen = Van Veen = 24 L24 L
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Core SamplingCore Sampling
Recent to older sedimentsRecent to older sediments
Stratified, less mobile depositsStratified, less mobile deposits
Aerobic Aerobic → anaerobic sediment→ anaerobic sediment
– Influences metal & nutrient Influences metal & nutrient availabilityavailability
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Core Samplers…Core Samplers…
May distort sediment column May distort sediment column (smearing, compression) or not sample (smearing, compression) or not sample completely (rodding)completely (rodding)
May require larger sampling vesselsMay require larger sampling vessels
Changing sediment composition = Changing sediment composition = variable variable penetration depthpenetration depth– Silt > sand > gravel or claySilt > sand > gravel or clay
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Core Sampler TypesCore Sampler Types
Hand corersHand corers– Cores = a few feet long, 2” diameterCores = a few feet long, 2” diameter– Shallow waterShallow water
Gravity corers, piston corers, etc.Gravity corers, piston corers, etc.– Cores < 5’ longCores < 5’ long– Deep waterDeep water
VibrocorersVibrocorers– Cores = up to 20’ long, 4” diameterCores = up to 20’ long, 4” diameter– Deep water (> 1,000’)Deep water (> 1,000’)
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Hand-coringHand-coringCoreCore TubeTube Plastic tube – drive in with Plastic tube – drive in with
fence post driver or sledgefence post driver or sledge
Can’t drive in farther Can’t drive in farther than can be pulled out than can be pulled out by hand, or with small by hand, or with small
winchwinch
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Hand-coringHand-coring
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Hand-coringHand-coring
SubsampleSubsample
sleevesleeve
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Gravity CorerGravity Corer
Balcheck corerBalcheck corer
Requires winchRequires winch– 50 lbs. +50 lbs. +
Core = a few feet Core = a few feet long, 2”-3” diameterlong, 2”-3” diameter
(Wildlife Supply Co.)(Wildlife Supply Co.)
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Vibrocore SamplingVibrocore Sampling
Rossfelder = www.rossfelder.comRossfelder = www.rossfelder.com
Rossfelder P-3 or P-5 vibrocore headRossfelder P-3 or P-5 vibrocore headSubmersible to 2,000’Submersible to 2,000’Cores 2”-4” diameter, up to ~ 15’ longCores 2”-4” diameter, up to ~ 15’ longVC head = 150 lbsVC head = 150 lbsVC head + full 15’ core tube = 300+ lbsVC head + full 15’ core tube = 300+ lbs
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Rossfelder P-5 Rossfelder P-5 vibrocorervibrocorer– 150 pounds150 pounds– 3,400 vpm3,400 vpm– Cores to ~ 15 feetCores to ~ 15 feet– Less disruption of Less disruption of
sediment column sediment column than “push cores”than “push cores”
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Vibrocoring from Vibrocoring from the the R.V. MudpuppyR.V. Mudpuppy
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Vibrocoring from the Vibrocoring from the R.V. MudpuppyR.V. Mudpuppy
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Vibrocoring from a Pontoon BoatVibrocoring from a Pontoon Boat
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Vibrocoring from a ZodiacVibrocoring from a Zodiac
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Vibrocoring from john boatsVibrocoring from john boats
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Vibrocorer suspended from boom truckVibrocorer suspended from boom truck
CorerCorer headhead
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Core SamplingCore Sampling
Core to “refusal” Core to “refusal” where possiblewhere possible
In impoundments, In impoundments, try for original try for original terrestrial soilterrestrial soil
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Core TubesCore Tubes
1/8”, 4” OD 1/8”, 4” OD Lexan tubingLexan tubing– Polycarbonate resinPolycarbonate resin
– Tougher than CAB, but more brittleTougher than CAB, but more brittle
– Not easily cut into sectionsNot easily cut into sections
– Available in other thicknesses & Available in other thicknesses & diametersdiameters
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Core TubesCore Tubes
3/32” thick, 4” OD 3/32” thick, 4” OD cellulose acetate cellulose acetate butyrate (CABbutyrate (CAB) tubing) tubing
– Easily cut into sections & cappedEasily cut into sections & capped
– Available in other thicknesses & Available in other thicknesses & diametersdiameters
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Core CatchersCore Catchers
From Wildlife Supply Co.From Wildlife Supply Co.
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Core ProcessingCore Processing
““Processing”:Processing”:1.1. Cut tube into sections, if necessaryCut tube into sections, if necessary2.2. Open core tubeOpen core tube3.3. Document core stratigraphyDocument core stratigraphy4.4. Collect sub-samplesCollect sub-samples
Can be done on sampling vessel or on Can be done on sampling vessel or on shoreshore
– On shore = more people, but fasterOn shore = more people, but faster
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Fein SawFein Saw
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Opening tube with a FeinOpening tube with a Fein®® saw saw
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Subsampling the CoreSubsampling the Core
Plan ahead of timePlan ahead of time
Consider necessary Consider necessary sample volume sample volume (= minimum (= minimum sampling interval)sampling interval)
Plan for field QC Plan for field QC samplessamples– Usually field dupsUsually field dups
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Documenting the CoreDocumenting the Core
Photographs:Photographs:
Label in each photoLabel in each photo
Put measuring tape Put measuring tape in photoin photo
Field NotesField Notes
Color, texture, etc.Color, texture, etc.
Don’t wear polarized Don’t wear polarized sunglassessunglasses
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A word about Sediment Dating…A word about Sediment Dating…
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A word about Sediment Dating…A word about Sediment Dating…
Lead-210Lead-210
tt1/21/2 = 22.3 years = 22.3 years
Gone after 6-7 half-lives (130-160 years)Gone after 6-7 half-lives (130-160 years)
Best in lake environmentsBest in lake environments
Often get confusing data; Often get confusing data; collect collect multiple coresmultiple cores
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Toxicity TestingToxicity Testing
Done less often than chemical testing Done less often than chemical testing or biological communitiesor biological communities
Why do toxicity testing?Why do toxicity testing?– Integrates effectsIntegrates effects– Not affected by habitat qualityNot affected by habitat quality– Uses important food chain organismsUses important food chain organisms– Direct proof of effectsDirect proof of effects
No effect = no pollution (?)No effect = no pollution (?)
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Freshwater Bioassay OrganismsFreshwater Bioassay OrganismsMidge larvae AmphipodMidge larvae Amphipod
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Toxicity Test TypesToxicity Test Types
Acute or ChronicAcute or Chronic
Standardized by EPA, ASTM, & Standardized by EPA, ASTM, & Environment CanadaEnvironment Canada
AcuteAcute = 10-14 days; endpoints = = 10-14 days; endpoints = survival, growthsurvival, growth
ChronicChronic = 28-60 days; endpoints = = 28-60 days; endpoints = survival, growth, reproductionsurvival, growth, reproduction
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Bioaccumulation TestingBioaccumulation Testing
Three kinds:Three kinds:
Laboratory testsLaboratory tests
Field studiesField studies– Caged organismsCaged organisms– Resident Resident
organismsorganisms
ModelsModels
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Bioaccumulation TestingBioaccumulation TestingLaboratory testLaboratory test = aquatic oligochaete = aquatic oligochaete Lumbriculus variagatusLumbriculus variagatus
28 days28 days
Accumulation Factor (AF) = Accumulation Factor (AF) = conc. in wormsconc. in worms
conc. in sedimentconc. in sediment
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Bioaccumulation ModelingBioaccumulation Modeling
Simplest = Equilibrium Partitioning Simplest = Equilibrium Partitioning ModelingModeling
LipidsLipids
Sediment CarbonSediment Carbon Interstitial WaterInterstitial Water
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Equilibrium Partition ModelingEquilibrium Partition Modeling
(Ct(Ctssss/L) = (Cs/TOC) x AF/L) = (Cs/TOC) x AF
CtCtssss = = fish tissue conc. at steady statefish tissue conc. at steady state
L = L = fish tissue lipid contentfish tissue lipid contentCs = Cs = sediment concentrationsediment concentrationTOC = TOC = sediment total organic carbonsediment total organic carbonAF = AF = biota/sediment accumulation biota/sediment accumulation
factor (BSAF)factor (BSAF)
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More sophisticated More sophisticated bioaccumulation modelsbioaccumulation models
Environmental propertiesEnvironmental properties– Water temperatureWater temperature– DOC, TOCDOC, TOC
Chemical characteristicsChemical characteristics– Water concentrationWater concentration– Sediment concentrationSediment concentration– Octanol-water partition coefficient (Kow)Octanol-water partition coefficient (Kow)
Species characteristicsSpecies characteristics– Lipid contentLipid content– DietDiet– Life history & food chain positionLife history & food chain position
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Bioaccumulation TestingBioaccumulation Testing
My preferred hierarchy:My preferred hierarchy:
Caged organisms & laboratory studiesCaged organisms & laboratory studiesResident YOY fishResident YOY fishResident adult bottom-feeding fish, or Resident adult bottom-feeding fish, or other benthic organismsother benthic organismsModelsModels
Always better to measure than to modelAlways better to measure than to model
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Dam-Specific Effects IssuesDam-Specific Effects Issues
Lower water level = turn aquatic Lower water level = turn aquatic problem into terrestrial problemproblem into terrestrial problem
– Different toxicity & bioaccumulation Different toxicity & bioaccumulation routes & endpoints (species)routes & endpoints (species)
– Top predator now an eagle or mink Top predator now an eagle or mink instead of a fishinstead of a fish
– Increase human exposure ?Increase human exposure ?
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Data Interpretation:Data Interpretation:Sediment Quality CriteriaSediment Quality Criteria
Uses:Uses:
Evaluate sediment qualityEvaluate sediment quality
Establish cleanup objectivesEstablish cleanup objectives
Assess suitability for open-water Assess suitability for open-water disposaldisposal
Assess fill quality for shoreline Assess fill quality for shoreline developmentdevelopment
Agree to at start of projectAgree to at start of project
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Chemical Concentration SQCChemical Concentration SQC
Tied to Tied to biological effectsbiological effects
– Cu > X ppm = mortality in mayfliesCu > X ppm = mortality in mayflies
Usually tied to Usually tied to toxicitytoxicity rather than rather than bioaccumulation or changes in bioaccumulation or changes in community structure or human healthcommunity structure or human health
More often More often guidelinesguidelines than than regulationsregulations
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Database Chemical SQCDatabase Chemical SQCIn
crea
sin
g C
on
cen
trat
ion
Incr
easi
ng
Co
nce
ntr
atio
n
PresumedPresumed
NontoxicNontoxic
PresumedPresumed
ToxicToxic
PossiblyPossibly
ToxicToxic
PECPEC
TECTEC
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Examples (Examples (mg/Kg DWmg/Kg DW))
ChemicalChemical TECTEC PECPEC
Total PCBsTotal PCBs 0.060.06 0.680.68
Total DDTTotal DDT 0.0050.005 0.570.57
CadmiumCadmium 0.990.99 4.984.98
LeadLead 35.835.8 128128
ZincZinc 121121 459459
(McDonald et al., 2000)(McDonald et al., 2000)
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Wisconsin SQC GuidanceWisconsin SQC Guidance
““Consensus-Based Sediment Qaulity Consensus-Based Sediment Qaulity Guidelines – Recommendations for Use Guidelines – Recommendations for Use
and Application – Interim Guidance”and Application – Interim Guidance”
WT-732 2003WT-732 2003
Wisconsin DNR Contaminated Sediment Wisconsin DNR Contaminated Sediment Standing TeamStanding Team
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One Scenario…One Scenario…In
crea
sin
g C
on
cen
trat
ion
Incr
easi
ng
Co
nce
ntr
atio
n
No additionalNo additional
samplingsampling
Additional samplingAdditional sampling
definitely requireddefinitely required
Additional sampling/assessment Additional sampling/assessment may be requiredmay be required
PECPEC
TECTEC
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Wisconsin = Midpoint Wisconsin = Midpoint Concentration & Concern LevelsConcentration & Concern Levels
Incr
easi
ng
Co
nce
ntr
atio
nIn
crea
sin
g C
on
cen
trat
ion
PECPEC
TECTEC
““MEC”MEC”
Level 4Level 4
Level 3Level 3
Level 2Level 2
Level 1Level 1
Use Levels to Rank SitesUse Levels to Rank Sites
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Other “SQC”Other “SQC”
SoilSoil quality criteria quality criteria
Residential or Industrial land useResidential or Industrial land use
PECPEC Resid. SoilResid. Soil Ind. SoilInd. Soil
PCBs PCBs 0.680.68 44 16 16
Copper Copper 149149 20,000 20,000 73,00073,000
Lead Lead 128128 400400 900 900
(mg/Kg DW)(mg/Kg DW)
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Dam-Specific SQC IssuesDam-Specific SQC Issues
Original native soil = excavation depthOriginal native soil = excavation depth
– Easy to determine excavation depthEasy to determine excavation depth
– Concentrations = Concentrations = cleanup criteria?cleanup criteria?
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Recon vs. Definitive SurveysRecon vs. Definitive Surveys
Start with Recon SurveyStart with Recon Survey
– Limited number of samplesLimited number of samples
– Bulk sediment chemistryBulk sediment chemistry
– Compare to SQCCompare to SQC
– Grain size & organic carbon contentGrain size & organic carbon content
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Recon vs. Definitive SurveysRecon vs. Definitive Surveys
Depending on results of Recon Survey, Depending on results of Recon Survey, may:may:
– No No additional samplingadditional sampling
– LimitedLimited additional sampling, for additional sampling, for chemistrychemistry
– ExtensiveExtensive additional sampling, for additional sampling, for chemistry, toxicity, bioaccumulationchemistry, toxicity, bioaccumulation
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Sediment Management Framework
Fullremoval
Partialremoval
Cap or isolate
Natural erosion& deposition
Stagedremoval
Low transport capacity and/or
low d/s sensitivity
High transport capacity and/or
high d/s sensitivity
Not bioavailable Bioavailable
(Optional)
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Complete Dam Removal & Complete Dam Removal & Natural Erosion & DepositionNatural Erosion & Deposition
Issue:Issue: demonstrate transport & demonstrate transport & deposition will not:deposition will not:
Cause Cause long-termlong-term adverse physical adverse physical habitat changes downstream or habitat changes downstream or upstreamupstream– Fill pools, bury riffles, etc. downstreamFill pools, bury riffles, etc. downstream– Upstream channel incisionUpstream channel incision
Increase Increase bioavailabilitybioavailability of contaminants of contaminants
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Staged Dam Removal & Staged Dam Removal & Natural Erosion & DepositionNatural Erosion & Deposition
Issues:Issues:
1.1. Assess Assess engineering suitabilityengineering suitability of dam of dam for staged removalfor staged removal
2.2. Assess impacts of Assess impacts of water flows and water flows and sediment loadssediment loads on downstream on downstream geomorphology and ecologygeomorphology and ecology
3.3. ((PlusPlus issues for complete dam issues for complete dam removal)removal)
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On-Site Isolation or CappingOn-Site Isolation or Capping
Issue:Issue: demonstrate that: demonstrate that:
Capping will reduce contaminant Capping will reduce contaminant availability to aquatic and terrestrial availability to aquatic and terrestrial ecosystems, and humansecosystems, and humans
Capping won’t disrupt remaining Capping won’t disrupt remaining ecosystemecosystem– Decrease riparian zone, wetlands, Decrease riparian zone, wetlands,
bottomlands, etc.bottomlands, etc.
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Partial Removal of Hot SpotsPartial Removal of Hot Spots
Tasks:Tasks:
1.1. Locate Locate hot spotshot spots
2.2. Remove & disposeRemove & dispose of sediment of sediment In the “dry” or “wet”In the “dry” or “wet”
3.3. Demonstrate that remaining sediment Demonstrate that remaining sediment is is nontoxicnontoxic
4.4. Post-remediation Post-remediation monitoringmonitoring
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Sediment Removal – Sediment Removal – “Wet” & “Dry”“Wet” & “Dry”
(HRC, Inc.)(HRC, Inc.)
(ECT, Inc.)(ECT, Inc.)
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Full Removal of All SedimentFull Removal of All Sediment
Tasks:Tasks:
1.1. Identify Identify extentextent of contaminated of contaminated sediment, sediment, inin 3D3D
2.2. Characterize Characterize degreedegree of contamination, of contamination, for disposal decisionsfor disposal decisions
3.3. Remove & disposeRemove & dispose
4.4. Post-remediation Post-remediation monitoringmonitoring
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Contaminated Seds = Contaminated Seds = Run AwayRun Away
Long term = Long term = bad ideabad idea
Reservoir = contaminant Reservoir = contaminant “time “time bomb”bomb”
Combine Combine dam hazard assessmentdam hazard assessment with contaminant assessment?with contaminant assessment?
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Post-Remediation MonitoringPost-Remediation Monitoring
Sediment analysesSediment analyses
Channel geometry & substrate Channel geometry & substrate measurementsmeasurements
Revegetation rate of former Revegetation rate of former impoundmentimpoundment
Fish & macroinvertebratesFish & macroinvertebrates
Changes in recreational & other social Changes in recreational & other social aspects and perceptionsaspects and perceptions
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““There is something fascinating There is something fascinating about science. One gets such a about science. One gets such a
wholesale return of conjecture out of wholesale return of conjecture out of a trifling investment of fact.”a trifling investment of fact.”
( (Mark Twain, 1874)Mark Twain, 1874)
Objective = optimize Objective = optimize representativenessrepresentativeness of our facts, to of our facts, to
improve the quality of our improve the quality of our conjecturesconjectures