of Influence for Chemical Treatment in an Unconfined Aquifer www terra envcorpcom HAMMOND LAKE COUNTY INDIANA Site Fine Sand Unconfined Aquifer Lower Confining Unit Petroleum Impacts ID: 430142
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Slide1
Determination of the Radius
of Influence for Chemical Treatment in an Unconfined Aquifer
www.
terra
-env-corp.comSlide2
HAMMOND
LAKE COUNTY
INDIANASlide3
Site
Fine Sand
Unconfined Aquifer
Lower Confining Unit
Petroleum Impacts
GasolineSlide4
Groundwater
Flow
Gradient .02
Flow E-NE
K=25 ft/daySlide5
Cross Section A-A’
Smear Zone
UtilitiesSlide6
Pre-Treatment
Groundwater PlumeSlide7
Pilot TestSlide8
Pilot Test
Injection Test
200 Gallons @ 2gpm
Three Observation Wells
Low Pressure
Double Diaphragm Pump Slide9
Pilot Test Results
Radius of Impact >15 feet
Injection
Pressure <10 psi
Rate 2gpmSlide10
Treatment Design
RegenOx
45 points
48lbs (oxidant)
94 gallons per point
Two Treatments
ORC-A Slide11
Implementation
August and September 2012
5 days per round x 2
2,160 lbs RegenOx
4,230 gallons
ORC-A
16.4 lbs/pointSlide12
Water Elevation Monitoring
During Injection
Water Level ResponseSlide13
Water Elevation Monitoring
During Injection
Water Level ResponseSlide14
Radial Pressure
Response
Observed > 40ft
Related
to KSlide15
Groundwater Stability Monitoring
D.O.
pH
Temp
ORP
TDSSlide16
Groundwater Stability Monitoring
D.O.
pH
Temp
ORP
TDSSlide17
Pre-Treatment
Groundwater Plume
StableSlide18
Post
Treatment
Groundwater Plume
Perimeter Treatment
Source TreatmentSlide19
Analytical
Results
Perimeter WellSlide20
Analytical
ResultsSource WellSlide21
Pre-Treatment
Soil PlumeSlide22
Post Treatment
Soil PlumeSlide23
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
distributionSlide24
Solution
Smear Zone Slide25
Solution
Treatment at High Water Table
90
percent efficiencySlide26
Problem
Application performed during low water level period
Application period driven by
regulatory
agency instead of site conditions
Application design does not consider contaminant concentrationsSlide27
Solution
Remedial Work Plan
Include Water Level Monitoring Design
Evaluate Smear Zone
Determine Seasonal FluctuationsSlide28
Solution
Continuous Water Level MonitoringSlide29
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
distributionSlide30
Solution
Treatment Design
Based on Distribution
Of
ContaminantSlide31
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 concentrationsSlide32
Questions?
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