1 technical and regulatory guidance this training is co-sponsored by the epa office of superfund...
TRANSCRIPT
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Technical and Regulatory Guidance
This training is co-sponsored by the EPA Office of Superfund Remediation and Technology Innovation
Welcome – Thanks for joining us.ITRC’s Internet-based Training Program
Strategies for Monitoring the Performance of DNAPL Source Zone
Remedies
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2ITRC (www.itrcweb.org) – Shaping the Future of Regulatory Acceptance
Network• State regulators• Federal government• Industry • Consultants• Academia• Community stakeholders
Documents• Technical and regulatory
guidance documents• Technology overviews• Case studies
Training• Internet-based• Classroom
ITRC State Members
FederalPartners
Host Organization
DOE DOD EPA
ITRC Member State
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ITRC Course Topics Planned for 2006
Characterization, Design, Construction and Monitoring of Bioreactor Landfills
Direct-Push Wells for Long-term Monitoring
Ending Post Closure Care at Landfills
Planning and Promoting of Ecological Re-use of Remediated Sites
Rads Real-time Data Collection Remediation Process
Optimization Advanced Training More in development…….
Alternative Landfill Covers Constructed Treatment Wetlands Environmental Management at
Operational Outdoor Small Arms Ranges
DNAPL Performance Assessment Mitigation Wetlands Perchlorate Overview Permeable Reactive Barriers: Lessons
Learn and New Direction Radiation Site Cleanup Remediation Process Optimization Site Investigation and Remediation for
Munitions Response Projects Triad Approach What’s New With In Situ Chemical
Oxidation
New in 2006Popular courses from 2005
Training dates/details at www.itrcweb.orgTraining archives at http://cluin.org/live/archive.cfm
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4Strategies for Monitoring the Performance of DNAPL Source Zone Remedies
Presentation Overview• Performance overview• Performance metrics• Questions and answers• Technology-specific tools• Regulatory issues• Stakeholder issues• Links to additional resources• Your feedback • Questions and answers
Logistical Reminders• Phone line audience
Keep phone on mute “*6” to mute, “*7” to un-mute to
ask question during designated periods
Do NOT put call on hold• Simulcast audience
Use at the top of each slide to submit questions
• Course time = 2¼ hours
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Meet the ITRC Instructors
Eric HausamannNew York State DECAlbany, New York518-402-9759 [email protected]
Konstantinos Kostarelos, Ph.D.Polytechnic UniversityBrooklyn, New York718-260-3260 [email protected]
Ryan A. Wymore CDM Denver, Colorado 720-264-1110 [email protected]
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Performance Assessment Overview
Presented by Eric Hausamann
New York State Department of Environmental Conservation
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Course Pre-Requisite
Possess a working knowledge of DNAPLs
Review: “An illustrated handbook of DNAPL transport and fate in the subsurface”
Other ITRC documents
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What You Will Learn……
Appreciation for performance assessment Importance of a valid conceptual site model Value of converging lines-of-evidence approach Regulatory issues to consider when planning a
performance assessment program Limitations of point measurements State-of-the-art techniques and tools for
assessing performance
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Major Take-Home Points
1. Performance goals and metrics should be established during design
2. MCLs are not a realistic short-term goal for a DNAPL source zone – alternate goals should be considered
3. Converging lines of evidence provide the most confidence in performance assessments
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Performance Defined
Performance is a measure of: Effectiveness
• Have project goals been met?
• Performance metrics Efficiency
• Is system operating as designed?
• Optimized in terms of time, energy, and cost
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Why Measure Performance?
Confirm remediation effectiveness Optimize system operation Monitor potential mobilization Couple to other technologies Determine achievement of contract milestones Refine conceptual site model Verify site closure decisions
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12Barriers to Robust Performance Assessment
Technical challenges• Site complexity
• Insufficient characterization Non-technical challenges
• Budgetary constraints
• Lack of standard tools and approaches
• Vague or unspecific RAOs
• Unsure what or where to measure
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13Performance Goals Appropriate for Phased Cleanups
“Don’t Expect to Achieve MCLs Within the Source Zone Any Time
Soon” - Anonymous
Long-term Intermediate-term
• Apply to source zones
• Treatment train approach Short-term
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14Measuring Progress Based on Field Metrics
Risk reduction is difficult to quantify directly We need measurable field metrics in order to
gauge success
“Given the unknowns in fully defining the human health and environmental effect of contaminants in ground water and soil,
the dilemma is how to define remediation technology performance in a way that is both quantifiable and relevant to
the goal of preventing adverse effects.”
National Research Council, 1997
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15Selecting Performance Metrics
When to decide on measures of success• Define “success” up front during design
• Involve entire project team Performance metrics are defined in terms of
• Performance goals
• Technology(ies) employed
• Affected or targeted media
• Location of potentially exposed populations
• Expected response of geosystem to treatment
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Source Zone Treatment Technologies
DNAPL recovery Soil vapor extraction / air sparging Thermally enhanced remediation Surfactant / cosolvent flushing Chemical oxidation Enhanced bioremediation
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Example: Young-Rainey STAR Center
Performance-based contract• Soil and groundwater concentration targets
• Temperature
• Hydraulic control Multiple lines of evidence
• NAPL content in fluids
• TPH monitoring
• Temperature distribution
• Interim samples
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Survey of DNAPL Projects
Method of Assessing Performance Number of Sites
Concentration reduction in specific monitoring wells
63 (79%)
Reduction in soil concentrations 29 (36%)
Achieve MCLs in monitoring wells 11 (14%)
Reduction in plume mass flux (or mass discharge)
18 (23%)
Reduction in plume size 20 (25%)
Production of degradation by-products 22 (28%)
Total mass removed 29 (36%)
Mass remaining 14 (18%)
Will not measure 0 (0%)
TOTAL NUMBER OF SITES 80
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Converging Lines of Evidence
There’s no silver bullet Utilize indicators of progress Technology-specific parameters
“No single metric by itself is likely to be adequate for assessing the performance and potential benefits of source depletion
technologies; thus, conjunctive use of multiple metrics should be used to evaluate performance.”
EPA Expert Panel on DNAPL Remediation, 2003
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20Designing a Performance Monitoring Program for DNAPL Source Zones
Presented by Dr. Konstantinos Kostarelos
Polytechnic University
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21Conceptual Site Model of DNAPL Source Zone
DNAPL pool in fractures
dissolved plume
release
pool
residual
vapors
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Major Concepts
Partitioning Saturation Retardation Rebound
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Partitioning of Contaminant
Source: Suthersan, 1996
1. Vapors in porespaces
4. Dissolved in soil moisture
2. DNAPL
3. Sorbed to soil particle
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Saturation
SNAPL = VNAPL / PV
}
Soil grains
Pore throatTrappedDNAPL
Interstitial water
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Retardation
A delay in the movement of a dissolved species• Sorption onto soil surfaces
• Sorption onto organic matter
• Partitioning into a non-aqueous phase
Contaminant dissolved in
groundwater
DNAPL
Clean
groundwater
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Rebound
Definition
Causes
Monitoring
0
100
200
300
400
500
600
700
0.0 5.0 10.0 15.0
time, years
co
nc
en
tra
tio
n,
mg
/l
Shut off pumps!
pump & treat
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Rebound
Definition
Causes
Monitoring
0
100
200
300
400
500
600
700
0.0 5.0 10.0 15.0
time, years
co
nc
en
tra
tio
n,
mg
/l
Begin monitoring
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28Possible Changes Resulting from Remediation
Redistribution of DNAPL Increased solubility Impact on microbes Subsurface alteration Preferential flow Precipitation/clogging Secondary water impact Gas generation
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Categories of Performance Metrics
Estimates of DNAPL Source Treatment Impact (4.4)
Decrease in Toxicity (4.4.1)
Contaminant analysis:• Soil cores• Groundwater
Decrease in Mobility (4.4.2)
Determine NAPL Saturation:• Soil core analysis• PITT
Decrease in Plume Loading (4.4.3)
Measure mass flux:• Transect of wells and multi-level samplers• Tubingen integrated pumping tests• Transect of borehole flux meters
Estimates of DNAPL Source Treatment Progress (4.2)
Decrease in Soil Conc. (4.2.1)
Measure contaminants in soil cores
Decrease in Dissolved Conc. (4.2.2)
Measure contaminants in groundwater samples
Estimates of DNAPL Source Mass Reduction1 (4.3)
Mass Extracted (4.3.1)
Ex situ measurement of wastestreams:• Vapor• NAPL• Groundwater
Mass Destroyed In Situ (4.3.2)
Indicators of breakdown products in groundwater:• Increase in chloride• Change in C-14• Change in Cl-isotopes
Mass Remaining (4.3.3)
Measure before/after masses:
• Soil Cores
• PITT
Decrease in Soil Vapor Conc. (4.2.3)
Measure contaminants in soil vapor samples
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Decrease in Soil Concentration (4.2.1)
Measure contaminants in soil cores
Decrease in Dissolved Concentration (4.2.2)
Measure contaminants in groundwater samples
Decrease in Soil Vapor Concentration (4.2.3)
Measure contaminants in soil vapor samples
Estimating Source Treatment Progress
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Decrease in Soil Concentration
Measuring soil concentration Low probability of detection
Probability of detection
Number of random samples required where:
AS/AT=10 AS/AT =100 AS/AT =1,000
98% 38 390 3,950
90% 22 230 2,400
75% 14 138 1,390
50% 7 70 700
30% 4 36 360
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Decrease in Soil Concentration
Other limitations• Losses due to evaporation
• Mixing of sample within the vertical profile
• Identifying concentration changes due to DNAPL movement, rather than remediation
• Size of sample required to identify DNAPL
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Decrease in Dissolved Concentration
Applicability and use Multi-level sampling Well design and
installation Purging Passive diffusion bag
samplers Limitations
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Decrease in Dissolved Concentration
Applicability and use Limitations
• Rate-limited process
• Groundwater dilution
• Rebound effect
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Decrease in Soil Vapor Concentration
Applicability and use• Volatile and some semi-volatile DNAPLs
• SVE remediation Limitations
• Soil gas flow rates variations
• Variations in concentrations
• Volatilization rates of DNAPL constituents
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Source Mass Reduction
Mass Extracted (4.3.1)
Ex situ measurement of waste streams:• Vapor• NAPL• Groundwater
Mass Destroyed In Situ (4.3.2)
Indicators of breakdown products in groundwater:• Increase in chloride concentration• Change in C-14• Change in Cl-isotopes
Mass Remaining (4.3.3)
Measure before/after masses:• Soil Cores• PITT
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Mass Extracted
Measuring concentration in extracted fluids:• Vapor phase
• DNAPL phase
• Groundwater phase
MassExtract = ConcFluid x Flow rate
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Mass Destroyed
Measuring breakdown products in groundwater• Increase in chloride concentrations
• Changes in stable carbon isotope ratios
• Changes in isotopes of chlorine
Example: The stoichiometric reactions of potassium permanganate (KMnO4) with perchloroethylene (PCE), thereby generating chloride ions
4KMnO4 + 3C2Cl4 + 4H2O => 6CO2 + 4MnO2(s) + 4K+ + 12Cl- + 8H+
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Mass Remaining
Estimating mass before and after remediation• Soil cores
• Partitioning Interwell Tracer Testing (PITT)
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Partitioning Interwell Tracer Testing
Applicability and use• Conservative and partitioning tracers injected
• Provides estimate of the average DNAPL saturation across the swept pore volume
Limitations• Heterogeneities result in poor sweep efficiency
• Requires unique skill set
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PITT Tracer Response
Tracer results: IPA, 2M2P Sor = 17.37%IPA, Pentanol Sor = 17.54%
Mass balance: Gravimetric Sor = 17.5%
0500
1500
2500
3500
4500
0 50 100 150 200 250 300
Cumulative Volume Produced (cc)
IPApentanol2-Methyl-2-pentanol
Tra
cer
co
nc
en
trat
ion
,m
g/l
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Source Treatment Impact
Decrease in Toxicity (4.4.1)
Contaminant analysis:•soil cores•groundwater
Decrease in Mobility (4.4.2)Determine NAPL Saturation:
•soil core analysis •PITT
Decrease in Plume Loading (4.4.3)
Measure mass flux:• Transect of wells and multi-level samplers• Tubingen integrated pumping tests• Transect of borehole flux meters
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Decrease in Toxicity
Removal of target compounds leaves less toxic residual
Measurement• Soil cores
• Groundwater Limitations
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Decrease in Mobility
Mobility reduction via source depletion Measured indirectly
• Soil cores
• PITT Limitations
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Decrease in Plume Loading
Goals of source treatment might include• Reduce contaminant migration
• Reduce plume longevity
• Reduce life-cycle costs
• Speed transition to more passive technologies
Mass flux or mass discharge rate is a direct measure of progress
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Concept of Mass Flux
Source: Wood, 2004
Local Flux
Source Zone
Response Boundary
Source
Strength
Most Contaminated
Least Contaminated
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Measuring Mass Flux
Methods• Continuous groundwater extraction
• Integrated pump tests
• Multi-level sampling
• Borehole flux meters Limitations
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Question and Answers
Intermediate goals?
Cost considerations?
Performance metrics?
Converging lines of
evidence?
www.itrcweb.org
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49Technology-Specific Performance Monitoring
Presented by Ryan Wymore
CDM
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Section Overview
Review of key definitions Technology-specific monitoring tools
• Conventional DNAPL remediation technologies
• Thermal technologies
• Surfactant/cosolvent flushing
• Chemical oxidation
• Enhanced in situ bioremediation
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Key Definitions
Remedial effectiveness• The ability of the system to achieve remediation
goals System efficiency
• Optimization of time, energy, and costs toward the achievement of remediation effectiveness using a specific technology.
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52
Conventional Remedies
DNAPL recovery• Pumping DNAPL from wells
Soil vapor extraction• Using a vacuum to remove volatile contaminants
from the vadose zone Air sparging
• Injecting air below the water table Key monitoring parameters
• Mass of contaminant removed
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53Monitoring for Thermally Enhanced Remediation
Steam enhanced extraction Electrical resistance heating Thermal conduction Key monitoring parameters
• Temperature
• Vapor concentration
• Dissolved concentration
• Soil concentration
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54Electrical Resistance Heating (ERH) at Paducah, KY DOE Facility
800
ft
>100 mg/l
Dissolved TCE
10-100 mg/l
1-10 mg/l
TCE Release: 1,000,000 lb?
Performance Metrics: Subsurface temperature Soil concentration Dissolved concentration
ERH Pilot Test Area
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55
PCUcondenser
cooling tower
VR blower
water tank
GAC vessel
GAC vessel
treatment region
TCE tank
Building C-400
crane gantry
GAC vessel
Paducah ERH Project Layout
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56
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (deg C)
Dep
thF
eet
(bg
s)
02/14/03
03/14/03
04/01/03
05/14/03
07/15/03
TCE DNAPL boiling
Water boiling
vado
se U
CR
Ssa
t. U
CR
SR
GA
McN
airy
Temperature (Degrees Celsius)10 20 30 40 50 60 70 80 90 100 110 120
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
Dep
th F
eet
(bg
s)
02/14/0303/14/0304/01/0305/14/0307/15/03TCE DNAPL boilingWater boiling
Paducah ERH Pilot Test: Temperature Versus Depth
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57Paducah ERH Pilot Test:Soil Concentrations
-60
-50
-40
-30
-20
-10
0
0 200,000 400,000 600,000 800,000 1,000,000ug/kg
Feet
(bg
s)
Zone
1
Zone
2
Zone
3
screen
screen
213 before and after soil sample pairs:average reduction: 98.1%D
epth
Fee
t (b
gs)
Concentration (ug/kg)
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58Paducah ERH Pilot Test:Groundwater Concentrations
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
800,000
900,000
1,000,000
1,100,000
1,200,000
1,300,000
TC
E C
on
cen
trati
on
(p
pb
)
Depth (feet bgs)
Baseline data
60% Sample
87% Sample
Post Heating
Two Week Post
Average Reduction: 98.9%
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
800,000
900,000
1,000,000
1,100,000
1,200,000
1,300,000
TC
E C
on
ce
ntr
ati
on
(p
pb
)
Depth (feet bgs)
Baseline
60% Sampling
87% Sample
Post Heating
Two Week Post
Average Reduction: 99.5%
Average reduction: 98.9%
Average reduction: 99.5%
MW-406 MW-407
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59Monitoring for Surfactant/Cosolvent Flushing
Technology description Key monitoring parameters
• Contaminant analysis
• Groundwater quality
• Injection/extraction flow rate
• NAPL saturation
• Visual changes in extracted fluids
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60Hill Air Force Base OU2 Surfactant/Cosolvent Flushing Project
SCADA, Flow Control, Autosampling
Mixing/InjectionOn-line GC
Surfactant/Alcohol Staging
InjectionWells (3)
ExtractionWells
ExtractionWells
Surfactant/Alcohol Staging
Performance Metrics: Dissolved concentration Mass flux Visual observation
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61Hill AFB OU2: Flux-Based Performance Study
Two flux measurement approaches• Passive flux meters
• Integrated pumping
Distance along cross-section (ft)
Ele
vatio
n (m
sl)
Alpine Clay Water Table9 May 2002
Silty sand
Well sorted sand
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62Hill AFB OU2: Results of Mass Flux Measurements
Mas
s flu
x (g
/day
)
Pre and Post-Source Removal Total Mass Flux of TCE and cis 1,2-DCE
Source: Hatfield, 2003
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63Hill AFB OU2: Extracted Fluid Visual Changes
Lower zone
Day 1Start S
urfactant
Injection
Days 13-18to
Upper zone
Days 3 - 122
Stop Surfactant
Injection
first 12 hrs
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64Monitoring for In Situ Chemical Oxidation (ISCO)
Technology description• Hydrogen peroxide• Permanganate• Ozone
Key monitoring parameters• Contaminant analysis• Water quality
parameters• Injection rate• Oxidant persistence
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65Performance Monitoring Considerations for ISCO
Oxidation is a destructive technology Allow sufficient time to evaluate conditions after
the site reaches equilibrium All oxidant must be consumed before post-
treatment conditions are assessed Post-treatment rebound (increase) in dissolved
contaminants can be observed due to desorption and NAPL dissolution
See http://www.itrcweb.org/isco-1.pdf
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66Chemical Oxidation Using Fenton’s Reagent at NSB Kings Bay, Site 11
Area of concern
Performance metric: dissolved concentration
Groundwater flow direction
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67Monitoring for Enhanced Bioremediation
Technology description Key monitoring
parameters
• Groundwater quality
• Stable-C isotopes
• Microbial characterization
• See Table 5-4 in the PA document
C I
PC E
C
C
C
C
H
TCE
CC
H H
cis - 1,2 - DC E
H
CC
H H
Vinyl Chloride
H H
CC
H H
Ethene
H H
CC
H H
Ethane
HH
H
CC
H
1,1 - DC EH
CC
H
trans - 1,2 - DC E
O O
C
Com plete M ineralizationO
HH
C I
C
H
C hlorine A tom
C arbon Atom
H ydrogen A tom
S ingle Chem icalB ond
D ouble Chem ical B ond
Cl C l
C l
C l
C l
C l C l
C l
C l
C l
C l
C lC l
C lC l
M odified from W iedem eier et al., 1996
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68Enhanced Bioremediation at Test Area North
Performance metric: dissolved concentration
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69Test Area North EISB: Groundwater Concentration Changes
Groundwater monitoring is conducted from 17 locations
Pre-lactate injection concentrations were >3 mg/L in the former injection well
Concentrations have been reduced to below detection in several wells by continued lactate injections
TCEIsoplethsTAN-D2
TAN-9
TAN-31
TSF-05
TAN-25TAN-26 TAN-37
TAN-28
TAN-30A
TAN-10A
TAN-29
TAN-49
TAN-27
Pre-Lactate
October 23, 2000
TAN-D2TAN-9
TAN-31
TSF-05
TAN-25TAN-26
TAN-37TAN-28
TAN-30A
TAN-10A
TAN-29
TAN-49
TAN-27
Former injection well
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70Test Area North EISB: Long-Term Dechlorination
Dark blue data series represents ethene Significant ethene concentrations at this well
indicate complete dechlorination is occurring
TAN-37C
0.0E+002.0E-064.0E-066.0E-068.0E-061.0E-051.2E-051.4E-051.6E-051.8E-05
Nov-98 Nov-99 Nov-00 Nov-01 Nov-02
Con
c. (
mol
/L)
PCE TCE cis-DCEtrans-DCEVCEthene
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71Test Area North EISB: Enhanced Mass Transfer from Source Area
TAN-26
0.0E+004.0E-068.0E-061.2E-051.6E-052.0E-052.4E-052.8E-053.2E-053.6E-054.0E-05
Eth
enes
(m
ol/
L)
TCEcis-DCEtrans-DCEVCEthene
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72
Presented by Eric Hausamann
New York State Department of Environmental Conservation
Regulatory and Stakeholder Concerns
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73
Health & Safety Issues
Sampling hot media Handling chemical oxidants Vapor monitoring Electrical hazards Sampling extracted
fluids Direct contact Shipping issues
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74
Regulatory Concerns
Specialized sampling methods Statistical evaluation of data Regulations and permits Alternate goals for source zones
Drilling in source zones
• Soil borings
• Monitoring wells
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75
Stakeholder Issues
Stakeholders have a right to be involved in defining project outcomes
Adequate characterization of source zone is expected
Vapor intrusion concerns are real Newer assessment approaches and technologies
need to be “sold” to non-technical audience On-going communication between the project
team and stakeholders is key
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76
In Summary…
1. Performance goals and metrics should be established during design
2. MCLs are not a realistic short-term goal for a DNAPL source zone – alternate goals should be considered
3. Converging lines of evidence provide the most confidence in performance assessments
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77
Thank You for Participating
Links to additional resources
2nd question and answer session