v seminário internacional sobre...
TRANSCRIPT
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 1
Aspects of investigation and remediation of ground water contamination in connection with brownfield
revitalization
Götz Heckmann
Environmental and Engineering Consultants Dr Eisele, Germany
V Seminário Internacional Sobre Remediaçaoe Revitalizaçao de Áreas Contaminadas
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 2
• Short presentation of Dr Eisele group of companies
• Methods of ground water investigation
• Examples (case studies) for hydraulic remediation in connection with brownfield revitalization
Structure
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 3
Environmental and
construction engineering consultants
Dr. Eisele mbHEngineering consultants
Dr. G. Hafner mbH
Operating and holding companyDr. Eisele mbH & Co. KG
Planning and project
development companyDr. Eisele
mbH
Dr Eisele group of companies (1)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 4
Dr Eisele group of companies (2)
USA
Mexico
Europe
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 5
• A lot of large-scale brownfields can not decontaminated completely due to costs
• The revitalization of such brownfields can be achieved if the remediation measures are limited to the prevention of hazards
Statements (1)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 6
• In the majority of contamination cases, ground water pollution causes the need for action
• The prevention of hazards concerning the ground water only is achievable if the transport mechanisms and the distribution of contaminants in the water logged zone is clarified
Statements (2)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 7
This presentation deals with methods of ground water investigation and the implementation of hydraulic remediation methods (safeguarding and decontamination) in connection with brownfield remediation.
Subject of presentation
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 8
• Detailed investigation of the aquifer
– aquifer structure
– aquifer boundaries
– hydraulic parameters
• Detailed investigation of groundwater contamination
– contaminant concentration distribution
Investigation steps (1)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 9
• Validation by numerical groundwater flow and transport modeling
– verified information of groundwater contamination (immission)
– verified information of contaminant mass fluxes (emission)
– base for the calculation of hydraulic remediation scenarios
Investigation steps (2)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 10
Hydraulic tests like• pumping tests
• injection tests
• slug & bail tests
• borehole tests with packers (slug-, drill-stem- or pulse-tests)
Tools for detailed investigation of the aquifer (1)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 11
Tools for detailed investigation of the aquifer (2)
Aquifer diagnostics by interpreting the test draw-down or build-up data using the most modern methods of oil industry
• plot of draw-down or build-up data within double logarithmic scale
• identification of the aquifer model using the typical gradient of the first derivative
• accurate determination of hydraulic parameters by type curve fitting
• determination of well quantities (well bore, storage, Skin)
• determination of aquifer boundaries
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 12
Principle of aquifer diagnostics (1)
log time
log
draw
-dow
n
draw-down data
first derivative
Horizontal line indicates infinite acting radial flow in an ideal aquifer
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 13
Principle of aquifer diagnostics (2)
log time
log
draw
-dow
n
draw-down data
first derivative
The typical slope in late time data with the gradient of -1 indicates the influence of a recharge boundary like a river or lake
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 14
Principle of aquifer diagnostics (3)
log time
log
draw
-dow
n
draw-down data
first derivative
Typical slopes in late time data with the gradients up to +1 indicate barrier boundaries, parallel barrier boundaries (like channels) or closed groundwater reservoirs
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 15
Classical approach: groundwater samples out of observation wells
advantages: - fast, direct
disadvantages: - many observation wells needed
- for the gaps between wells only interpolation possible
Variants for a detailed investigation of groundwater contamination (1)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 16
Variants for a detailed investigation of groundwater contamination (2)
Modern approach: determination of contaminant mass fluxes by integral pumping test analysis
advantages: - total mass flux and concentration distribution can be obtained
- no interpolation of point scale concentration measurements is needed
- fewer observation wells necessary
disadvantages: - pumping tests and - if necessary -- cleaning of the discharge needed
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 17
0
5
10
15
20
0 1 2time [d]
Cp
plume
wellcatchment area
Principle of integral pumping tests
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 18
enbQtrπt)( =;
)()(arccos2
)()(arccos
)()(arccos2
1
1
1
1
−
−
=−
−
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020406080
100
0 1 2 3 4 5 6 7 8 9 10r [m]
Cx
0
5
10
15
20
0 1 2t [d]
Cp
Analytical inversion for infinite radial flow, groundwater velocity negligible, after TEUTSCH et al. (2000)
Result: plume with a concentrationof 90 in a distance 5-8 m form the pumped well
Principle of analytical inversion
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 19
source
control plane 1 control plane 2groundwaterflow
Principle of source detection
well1
well2
well3
well4
plume
integral pumping tests
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 20
Case study: integral groundwater investigation Ravensburg (SW-Germany) (1)
Project data• 1,000,000 m² area, recently or formerly used by industry
(engine construction industry, gas plant, metal working, chemical industry), gas stations, dry-cleanings, disposal sites, residential areas
• known and assumed ground water contamination by HVHH, PAH, HC, BTEX, phenol, cyanide and heavy metals
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 21
Case study: integral groundwater investigation Ravensburg (SW-Germany) (2)
Tasks• detection and assessment of ground water contamination
in connection with urban planning and site revitalization• evaluation of contaminant emission (ground water)• discrimination of contaminant plumes • allocation of plumes to potential impact-areas and
pollution emitters• identification of areas without ground water impact
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 22
Case study: integral groundwater investigation Ravensburg (SW-Germany) (3)
Methods• numerical ground water flow and transport model for
planning the investigations, validation of the results and backtracking the determined groundwater pollution to emitters
• integral pumping tests and test analysis tools
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 23Schussen riv
er
Engine construction industry(known pollution)
Chemicals stock(unknown pollution)
Dry cleaner(unknown pollution)
How the method works ...
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 24
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Engine con-struction industr(known pollution
Chemicals stock(unknown pollution)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 25
Case study: revitalization of a former industrial site in Romania (1)
• 197.000 m²• Former use as fuel storage site• Located in the northern part of
Bucharest• Close to lakes• Close to the Airports• Future development area
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 26
Case study: revitalization of a former industrial site in Romania (2)
Aerial view
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 27
Case study: revitalization of a former industrial site in Romania (3)
Bombardment 1944 duringWorld War II
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 28
Case study: revitalization of a former industrial site in Romania (3)
Grid of ground water model
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 29
Ground water treatment plant
Hydraulicbarrier
Groundwater flow direction
Contaminated groundwater
Infiltrationline of treatedgroundwater
Air-injection lines
Case study: revitalization of a former industrial site in Romania (4)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 30
Air-injection to provide enough oxygen to enhance naturallyexisting biological degradation
Installation of pump system in at least 15 wells in the ground water run-off
Pump-and-treat system: prevention of contaminant movement off BANEASA-site
Infiltration of cleaned waterinto inflow for enhancement of biological degradation
Case study: revitalization of a former industrial site in Romania (5)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 31
Case study: revitalization of a former industrial site in Romania (6)
mode of operation of withdrawal (blue dots) and infiltration (red dots) of ground water (particle tracking)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 32
Petrom City – Draft The closed oval solitaire buildings group themselves radial around the Petrom Plaza. The Solution Center is divided in two connected solitaires.
Case study: revitalization of a former industrial site in Romania (7)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 33
former KIENZLE-site, Schwenningenformer fabrication of watchesarea: 47,000 m²location: city centernot used for 18 years
Case study: revitalization of a former industrial site in SW-Germany (1)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 34
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2,4
13,3 63,2
10,8
0,7
1,2
1,29
0,9
129,4
310
60,5
0,2
n.n.
5,8
0,4
1,0
4,3
4,3
n.n.
Lösemittel-abfüllstation
Erdtanks4x5m3
Kellertanks6x3m3
Lösemittel-lager
Entfettungs-anlage
Entfettungs-anlage
vermutetesEntwässerungsrohr
landfill with radioactive components
HVHH contamination
Case study: revitalization of a former industrial site in SW-Germany (2)
ground water flow
max. conc.: > 20 mg/l HVHH
mass flux:
> 2,5 kg/d
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 35
0,6n.n.
n.n.
37,4
42,3
22,7
13,2
1,4
8,6
207
21000
91,048,9
13,0
71,6
1,8
7584,2
16,0
4,31,8
6,2 52,6
129,2
75
123,7
64,1
58,4
106,4
7,1
58,5
30,452,6
0,6
42,1
22,2
0,6
20,524,2
15,125,5
12,7
1,5n.n.n.n.
0,8
n.n.
n.n.20,9
1,1
0,7
n.n.
n.n.14,0
n.n.
0,4
1,2
n.n.
1,31,1
7,5
n.n.
4,4
0,5
10,5
33,20,2
2,3
5,7
2,7
n.n.
0,7
0,9
1,5
4,4
2,7
1,6
10,039,1
6,9
n.n.
24,1
6,8
1,1
149,20,4
2,4
2,4
13,3 63,2
10,8
0,7
1,2
1,29
0,9
129,4
310
60,5
0,2
n.n.
5,8
0,4
1,0
4,3
Lösemittel-abfüllstation
Erdtanks4x5m3
Kellertanks6x3m3
Lösemittel-lager
Entfettungs-anlage
Entfettungs-anlage
vermutetesEntwässerungsrohr
GeplantesBereitstellungslager
2,5
1,0
2,6
2,01,02,0
0,8
1,0
1,5
1,0
1,5
1,32,0
1,3
2,4
1,02,5
2,5
0,5
2,7 2,7 1,9
0,80,8
SB6
SB5SB1
SB2
SB3 SB4
Austraße
683.3
683.3
683.5
683.5
683.5
683.7
683.9
removal of contaminant sources
hydraulic ground water safeguarding
(pump and treat)
technical safeguarding of disposal site
Case study: revitalization of a former industrial site in SW-Germany (3)
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 36
Case study: revitalization of a former industrial site in SW-Germany (5)
supermarket
parking area
administration building
residential area
lake
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DR. EISELE
Investigation of ground water contamination
2007-11-07 page 37
Eu agradeço pela atençao!