Determination of the Radius of Influence for Chemical Treatment in an Unconfined Aquifer
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Transcript of Determination of the Radius of Influence for Chemical Treatment in an Unconfined Aquifer
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Determination of the Radius
of Influence for Chemical Treatment in an
Unconfined Aquifer
www.terra-env-corp.com
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HAMMOND
LAKE COUNTYINDIANA
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Project 97-017LocationBoring Date Ground Surface Dip 90Depth Scale
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Description
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0 SURFACE GRADE 0 Stone Flush Mount Cover
1 Fill, aggregate engineering fill 1.0 J Plug Bentonite Seal
2 2SM Silty sand 2.5 top of screen
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4 sand pack 2. to 12.5 ft
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6 saturated at 6. feet
7 7.0 12.5 to 2.5 screen
8 CL Inorganic clay, gravely-sandy clay, m-l plasticity
9 prepacked screen
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TERRA ENVIRONMENTAL CORPORATION BORING LOGMW-10
SOIL PROFILE
2B
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0.0
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MC 95% 0.0
50%
Site• Fine Sand • Unconfined Aquifer• Lower Confining Unit• Petroleum Impacts• Gasoline
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GroundwaterFlow• Gradient .02• Flow E-NE• K=25 ft/day
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Cross Section A-A’• Smear Zone• Utilities
A'MW-7 Storm
TB-1 MW-6 C Sewer MW-10Vault
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electricgas
StormSewer water
GroundwaterFluctuation
Sanitary Sewer
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CLSilty sand
Inorganic clay, gravely-sandy clay, m-l plasticity
SM
CL
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Pre-TreatmentGroundwater Plume
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Pilot Test
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Pilot Test• Injection Test• 200 Gallons @ 2gpm• Three Observation Wells• Low Pressure• Double Diaphragm Pump
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Pilot Test Results• Radius of Impact >15 feet• Injection Pressure <10 psi• Rate 2gpm
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Treatment Design• RegenOx• 45 points • 48lbs (oxidant)• 94 gallons per point• Two Treatments• ORC-A
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Implementation• August and September 2012• 5 days per round x 2• 2,160 lbs RegenOx• 4,230 gallons• ORC-A • 16.4 lbs/point
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Water Elevation Monitoring• During Injection• Water Level Response
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Water Elevation Monitoring• During Injection• Water Level Response
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Radial Pressure Response• Observed > 40ft• Related to K
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Groundwater Stability Monitoring• D.O.• pH• Temp• ORP• TDS
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Groundwater Stability Monitoring• D.O.• pH• Temp• ORP• TDS
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Pre-Treatment Groundwater Plume• Stable
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Post TreatmentGroundwater Plume• Perimeter Treatment• Source Treatment
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AnalyticalResultsPerimeter Well
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AnalyticalResultsSource Well
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Pre-TreatmentSoil Plume
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Post TreatmentSoil Plume
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Problems• Application performed during low water
level period• Application period driven by regulatory
agency instead of site conditions• Application design does not consider
contaminant concentration distribution
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SolutionSmear Zone
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SolutionTreatment at High Water Table• 90 percent efficiency
A A'MW-1 T-2
GP-4 MW-6 GP-8 MW-5100
99
9890% Treatment
97
96
95 SM
9435% Treatment
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92 CL
91 CL
90 CL Silty sand
89Inorganic clay, gravely-sandy clay, m-l plasticity
ftCL
SM
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Problem• Application performed during low water
level period• Application period driven by regulatory
agency instead of site conditions• Application design does not consider
contaminant concentrations
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SolutionRemedial Work Plan• Include Water Level Monitoring Design• Evaluate Smear Zone • Determine Seasonal Fluctuations
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SolutionContinuous Water Level Monitoring
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Problem• Application performed during low water
level period• Application period driven by regulatory
agency instead of site conditions• Application design does not consider
contaminant concentration distribution
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SolutionTreatment DesignBased on Distribution Of Contaminant
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Conclusions• Application should be performed based
on high water level data for the site• High water level results in better pore
contact with the source area
• Contaminant concentrations must be considered in the design of the application
• Distribution of the product should be consistent with the contaminant concentrations
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