PART 2 ‐ ISCO - NEWMOA · 2009 Persulfate Injection • Focus on “hotspot” near...
Transcript of PART 2 ‐ ISCO - NEWMOA · 2009 Persulfate Injection • Focus on “hotspot” near...
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PART 2 ‐ ISCOPART 2 ISCO
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NEXT STEPSNEXT STEPS• Develop Remedial Strategy (ISCO) in p gy ( )consideration of competing CSMs
• CSM 1 (Simplistic): Residual NAPL: ‘Pancake’ Model– Residual NAPL: Pancake Model
– Bedrock as Equivalent Porous Medium (EPM)• CSM2 (More Complex)( p )
• Residual NAPL: Vertical Equilibrium Model (VEM)• Bedrock: CSM considers Bedrock Complexity (GFM)
• Remedial ImplementationRemedial Implementation• Evaluate Monitoring Data wrt CSM 1 and 2• Determine Next Stepsp
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CSM ConsiderationsCSM Considerations
• Residual NAPL distributionResidual NAPL distribution– “Pancake Model”Vertical Equilibrium Model– Vertical Equilibrium Model
• Fracture System/GFM– Sub‐horizontal “Sheeting Fractures”– West‐Dipping Foliation Parallel Fractures
• GFM implications to CSM and ISCO effectiveness
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Vertical LNAPL DistributionVertical LNAPL Distribution
No YesPancake Model vs. Vertical Equilibrium Model
No Yes
Vertical EquilibriumPancake Model
•LNAPL penetrates b l
•Assumes LNAPL floats on water
LNAPL
below water table
•LNAPL and t i t
on water table
• Uniform LNAPL
Water
water coexist in pores
LNAPL saturation Grains
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“PANCAKE MODEL”W E Hydrogeologic Cross SectionW‐E Hydrogeologic Cross‐Section
UST 13 Area
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GFM ‐ Observed Fracture System
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True‐Scale Cross Section of UST‐13 Area Normal to Foliation, Illustrating MonitoringNormal to Foliation, Illustrating Monitoring
Gap
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Conceptual Fracture NetworkConceptual Fracture Network
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NAPL Pathway – Active Fracturesi l ilib i d lVertical Equilibrium Model
UST
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Vertical Equilibrium ModelC t l S Z Hi h W t T blConceptual Smear Zone – High Water Table
UST
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Vertical Equilibrium ModelConceptual Smear Zone – Low Water TableConceptual Smear Zone Low Water Table
UST
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?
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2009 Persulfate Injection
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2009 Persulfate Injection2009 Persulfate Injection• Focus on “hotspot” near 32M‐01‐18XBR
– 50 X 50 X 25 ft (10 ft Saturated thickness)50 X 50 X 25 ft (10 ft. Saturated thickness)– 3 shallow bedrock injection wells installed around 32M‐01‐18XBRb d i j i ll i ll d f• Overburden injection well installed on Top‐of‐
bedrock in former tank grave• 1800 gallons of water/sodium persulfate solution• 1800 gallons of water/sodium persulfate solution injected February 2009 (5000 lbs)
• sodium hydroxide used as catalyst• ~ $36,000 (Estimate)
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2009 Persulfate Injection2009 Persulfate Injection
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Injection Pressure ResponseFar FieldFar Field
Data Corrupted
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Injection Pressure ResponseNear FieldNear Field
Transducer Malfunction
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Injection Conductivity ResponseNear FieldNear Field
Discernable Conductivity Increase
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May 2010300 ug/l300 ug/l
Cleanup goal = 600 ug/l
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May 2010y59 ug/l
Cleanup goal = 40 ug/l
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M 2010May 2010300 ug/l
Cleanup goal = 200 ug/l
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Water Levels - 32M-01-18XBR
248
244
246
242
vatio
n - m
sl
Series1
238
240
WL
Elev
236
234
Jan-0
2Mar-
02May
-02Ju
l-02
Sep-02
Nov-02
Jan-0
3Mar-
03May
-03Ju
l-03
Sep-03
Nov-03
Jan-0
4Mar-
04May
-04Ju
l-04
Sep-04
Date
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True‐Scale Cross Section of UST‐13 Area Normal F li i I j i W ll I ll dto Foliation, Injection Wells Installed
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Questions for Ongoing LTMQuestions for Ongoing LTM
• Is the apparent COC attenuation real?Is the apparent COC attenuation real?• Or will the Oscillatory longer‐term trends resume• Does the site behave as a typical “drowned smearDoes the site behave as a typical drowned smear zone”?
• Delivery: Will future remedial efforts need to moreDelivery: Will future remedial efforts need to more carefully consider the bedrock fracture system?
• Deliverance (Site Closure): How might one increase ( ) gthe oxidant contact with residual contaminants?
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Next StepsNext Steps• Install • Update CSM
– Install Transducers to evaluate long‐term water level trends– Improve Geologic‐Fracture Model (GFM); – Evaluate COC trends wrt WLs and GFM
• Determine whether additional remedial measures are needed
• If necessary, Consider Injecting in down‐dip directions (Likely Location of Residual Contaminants)
• Monitor in down gradient areas in consideration of bedrock ground water gradients and bedrock fabric
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2009 Persulfate Injection2009 Persulfate Injection
INJECT HEREINJECT HERE
MONITOR HERE
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• THANKSTHANKS
Q i ??• Question ??