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Welcome to the CLU-IN Internet Seminar

Vadose-zone Monitoring as a key to Groundwater Protection and Optimization of Remediation Strategies

Sponsored by: USEPA Technology Innovation & Field Services DivisionDelivered: April 07, 2010, 1:00 PM - 3:00 PM, EDT (17:00-19:00 GMT)

Instructor:Ofer Dahan, Ben Gurion University of the Negev ([email protected])

Moderator:Jean Balent, U.S. EPA, Technology Innovation and Field Services Division ([email protected])

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Vadose-zone Monitoring Systemkey to groundwater protection and

optimization of remediation strategies

Dr. Ofer Dahan Ben-Gurion UniversityE-mail: [email protected] Phone: (+972) 52 8795888

Shuki BonesE-Mail: [email protected]: (+972) 50 5316637

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Subsurface pollution

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Site characterization

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Perchlorate

Perchlorate (ppm)

0 500 1000 1500 2000 2500 3000 3500

De

pth

(m

)0

10

20

30

40 T10A1T10A 40

0

10

20

30

Meters bgs

53.1

28.027.0

1.0

13.0

20.0

34.0

17.0

7.0

2.0

50

40.05

29.0

40

0

10

20

30

Meters bgs

53.1

28.027.0

1.0

13.0

20.0

34.0

17.0

7.0

2.0

50

40.05

29.0

Profiles- a snap shot in time of dynamic processes

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Groundwater

Pollution source

Vadose Zone

Observation well

Groundwater monitoring through observation wells

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Direct monitoring of water flow and contaminant transport through the vadose zone

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3-D representation of a vadose zone monitoring system

Ashdod – Coastal plain, Israel

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*Patents pending

Vadose zone Monitoring System - VMS

FTDR

VSP

VMS installation

Sampling unit

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Preparation

Installation

Monitoring11

VADOSE ZONE MONITORING SYSTEM

Designed to provide:

Continuous real-time information on the hydraulic and chemical properties of the percolating water in deep vadose zone

through in-situ measurements of natural undisturbed conditions

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VMS application in projects on water percolation and contaminant transport through the vadose zone

Natural rain water infiltration through sand dunes

Waste water infiltration from contaminated stream channels

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Orchard

Open field cropGreen house


Agricultural setups

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Flood water infiltration

Water infiltration from reservoirs


Wadi Arava, IL

Buffels River, SA

Tzukim reservoir, IL

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Diary farm influence on groundwater

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Controlled remediation of contaminated vadose zone


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Floodwater Percolation and Groundwater Recharge in Arid LandsFloodwater Percolation and Groundwater Recharge in Arid Lands

Dahan et al., 2007. Journal of HydrologyDahan et al., 2007. Journal of HydrologyDahan et al., 2008. GroundwaterDahan et al., 2008. GroundwaterDahan et al., 2009. Vadose zone JournalDahan et al., 2009. Vadose zone Journal18

Kuiseb River, Namibia Kuiseb River, Namibia

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Monitoring of floodwater percolation and groundwater Monitoring of floodwater percolation and groundwater recharge in arid lands – Kuiseb River, Namibiarecharge in arid lands – Kuiseb River, Namibia

Dahan et al., 2008. GroundwaterDahan et al., 2008. GroundwaterMorin et al., 2009. J of HydrologyMorin et al., 2009. J of Hydrology

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Flood water percolation during sequential floods-Kuiseb River - Namibia

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Tzukim Reservoir- Arava

Infiltration from reservoirs

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First flood

Reservoir and groundwater hydrographs 23

Water Content Profile in the vadose zone under a reservoir

First flood

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30/10/04

Water Content

0.00 0.05 0.10 0.15 0.20 0.25 0.30

Dep

th (

m)

0

1

2

3

4

5

6

0 days2 days20 days40 days108 days197 days

30/10/04

Water Content

0.00 0.05 0.10 0.15 0.20 0.25 0.30

Dep

th (

m)

0

1

2

3

4

5

6

0 hours2 hours8 hours12 hours16 hours32 hours

Water content profile in the vadose zone under a reservoir

Second flood

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Silt & clay accumulation on the bottom an infiltration reservoir as a consequence of a single flood event

Tzukim reservoir - Arava, Israel

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Water percolation and solute transport through layered heterogeneous

sediments

Dahan et al., 2009. Vadose zone Journal.

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Water content variation

Water percolation and solute transport through layered heterogeneous sediments

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Tracers breakthrough curves at various depths during

infiltration depth

(a) 0.6 m

0 5 10 15 20 25 30

0.0

0.1

0.2

0.3

0.4

0.5

(c) 2.2 m

0 5 10 15 20 25 30

0.00

0.01

0.02

0.03

0.04

0.05

(d) 3 m

0 5 10 15 20 25 30

0.00

0.01

0.02

0.03

0.04

0.05

(b) 1.4 m

0 5 10 15 20 25 30

0.00

0.02

0.04

0.06

0.08

0.10

Time (h)T1 T2 T3 T5T4

Rel

ativ

e co

ncen

trat

ion

(C/C

0)

Tracers injection period

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Water Percolation Through Deep Vadose Zone

Rimon et al., 2007: Water percolation through the deep vadose zone and groundwater recharge: preliminary results based on a new vadose-zone monitoring system. Water Resources Research.

FTDR

Ob

serv

ati

on

wel

l

6.5

m

21

m

VSP

Vadose zone

Groundwater

FTDR

Ob

serv

ati

on

wel

l

6.5

m

21

m

VSPFTDR

Ob

serv

ati

on

wel

l

6.5

m

21

m

Ob

serv

ati

on

wel

l

6.5

m

21

m

VSP

Vadose zone

Groundwater

3-D representation of the monitoring setup

Field installation

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Water content variation due to rain induced infiltration events across a 21m thick vadose zone

Water content variation due to rain induced infiltration events across a 21m thick vadose zone

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Water content variation due to infiltration events across a 21m thick vadose zone


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34

0

5

10

15

20

25

20/11/2005 18/12/2005 15/01/2006 12/02/2006 12/03/2006 09/04/2006

Dep

th (

m)

Wetting front propagation across the vadose zoneWetting front propagation across the vadose zone

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Chloride profiles

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Chloride profiles

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Chloride profiles

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Bioremediation of polluted vadose zone

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Bioremediation of polluted vadose zone

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Bioremediation of polluted vadose zone underlying a gas station

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Excavation of contaminated top soil

3-D representation of the remediated site

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VMS installation Control panel

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Water content variations with depth during wetting process

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ETHYBENZENE

VOC concentration in the vadose zone pore water during wetting process

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Isotopic composition of selected VOCs

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Continuous monitoring of flow and transport in the vadose zone

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Potential monitoring application

• Leaches under LANDFILLS

• Fuel leaks from GAS STATIONS

• Leaks HAZARDOUS WASTE from tanks, storage lagoons and sensitive factories of potential pollution

• On line monitoring and control of REMRDIATION efficiency

* The monitoring system may be installed under existing active facilities with minimal disturbance

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Thanks

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Welcome to the CLU-IN Internet Seminar