Determination of the Radius of Influence for Chemical Treatment in an Unconfined Aquifer

Determination of the Radius

of Influence for Chemical Treatment in an

Unconfined Aquifer

www.terra-env-corp.com

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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A

A'

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Monitoring Well

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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MW-6

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A

B

C

0ft30ft

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Monitoring Well

Pre-TreatmentGroundwater Plume

Pilot Test

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INJ PT

OW-1

OW-2

OW-3

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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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