Determination of the Radius
of Influence for Chemical Treatment in an
Unconfined Aquifer
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HAMMOND
LAKE COUNTYINDIANA
Project 97-017LocationBoring Date Ground Surface Dip 90Depth Scale
Unifi
ed SC
S
Description
Strat
a Plo
t
Dep
th B
SG
Mun
sell C
olor
I D
TYPE
Reco
very
PID
Valu
e
Soil A
nalyt
ical
Dep
th in
feet
Annu
lusM
icro
Well
3/4"
Annu
lus
Material
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
3
4 sand pack 2. to 12.5 ft
5
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
10
11
12 12.0Total Depth 12.5 feet 12.5 bottom of
13 screenWell point
14
Dire
ct Pu
sh T
echn
olog
y
3B
1B
2A
MC 80% 0.0 yes
TERRA ENVIRONMENTAL CORPORATION BORING LOGMW-10
SOIL PROFILE
2B
FL 1A
MC
SAMPLES
0.0
3A
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
Cross Section A-A’• Smear Zone• Utilities
A'MW-7 Storm
TB-1 MW-6 C Sewer MW-10Vault
HA-5
electricgas
StormSewer water
GroundwaterFluctuation
Sanitary Sewer
CL
CLSilty sand
Inorganic clay, gravely-sandy clay, m-l plasticity
SM
CL
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Pre-TreatmentGroundwater Plume
Pilot Test
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INJ PT
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Pilot Test• Injection Test• 200 Gallons @ 2gpm• Three Observation Wells• Low Pressure• Double Diaphragm Pump
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
Implementation• August and September 2012• 5 days per round x 2• 2,160 lbs RegenOx• 4,230 gallons• ORC-A • 16.4 lbs/point
Water Elevation Monitoring• During Injection• Water Level Response
Water Elevation Monitoring• During Injection• Water Level Response
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Radial Pressure Response• Observed > 40ft• Related to K
Groundwater Stability Monitoring• D.O.• pH• Temp• ORP• TDS
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
AnalyticalResultsPerimeter Well
AnalyticalResultsSource Well
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Pre-TreatmentSoil Plume
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Post TreatmentSoil Plume
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
SolutionSmear Zone
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
93
92 CL
91 CL
90 CL Silty sand
89Inorganic clay, gravely-sandy clay, m-l plasticity
ftCL
SM
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
SolutionRemedial Work Plan• Include Water Level Monitoring Design• Evaluate Smear Zone • Determine Seasonal Fluctuations
SolutionContinuous Water Level Monitoring
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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Monitoring Well
2x
1x1x
0ft30ft
SolutionTreatment DesignBased on Distribution Of Contaminant
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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