Transcript CEPAS|USP

Jurubatuba: research results and insights
for the contaminated groundwater
management
Reginaldo Bertolo
Marcos Barbosa
Daphne Pino
Paulo Lajkasek-Lima
Amelia Fernandes
Ricardo Hirata
.
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Conducted by:
Financial supported by:
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Objectives
 Since 2011, CEPAS|USP + CETESB project: to
establish the technical basis for the
management of contaminated areas in
fractured aquifers, through the definition of
protocols for the characterization of these sites
 Jurubatuba (SP) area is a pilot area.
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Jurubatuba (SP) industrial area
Contaminanted sites w/ Cl-VOCs
Production-wells w/ Cl-VOCs
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Objective of this estudy
To present some lessons that we learned (so far):
Hydrogeological + contamination conceptual
models of fractured aquifers
Evaluation of techniques and technologies
employed for fracturated aquifer studies
Evaluation of technical approaches for study
large (multi-source) contaminated areas
in
São Paulo’
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Loggings in 5 wells
Accoustic & optical televiewer
Gamma & caliper
Geological features +
fractures behaviour
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Conceptual structural geological model >
geometry of the aquifer
Fiúme, 2014
• NNE a NE, low dip fractures
• // to gneissic rocks foliation
• important to gw flow
•More spaced high dip fractures
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Packers and hydralic tests
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60 m depth borehole
DFN method
VOC in rocks
(m)
Higher concentration in
saprolite & soft weathered
bedrock
No migration to the fresh rock by matrix diffusion
(m)
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FLUTe blank liner
Keller et al. (2013).
Westbay multisampling system
• 16 ports in fractured rock (15-55m)
• Sampling for VOC, [H,O,C,,Cl]-isotopes;
microorgnisms
Direct Push Injection Logging
High resolution K of soil/weathered rock
Dietrich et al. (2008)
CMT (continuous multichannel tubing)
7 ports in 14m-deep well
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Lessons learned from the fractured rock aquifer
investigations
 Geological (+structural) mapping is an
important tool for aquifer geometry
determination
 + geophysical loggings + hydraulic tests with
straddle packers for aquifer conceptual model
 Special soil/weathered-fresh rock sampling
technique for contaminant characterization in
solid phase
 Westbay is indicated (only) for specific &
complex situations (expensive)
 Introduction of new techniques is necessary to
study (contaminanted) fractured aquifers
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Jurubatuba contaminated area
High density of information among
potential areas
Different stage of investigation
Lack of information
There isn’t an integration of all
monitoring activities (GIS?)
Investigation in a very
shallow aquifer portion
Barbosa, 2015
Jurubatuba complex area
 Foundation of a consortium of legal
responsibles for contaminated areas & civil
construction industry to rise funds to enable
integrated investigation and implement the
deep fractured aquifer monitoring
Dr. Ricardo Hirata
CEPAS|USP – Centro de Pesquisas de Águas
Subterrâneas – USP
[email protected]
http://cepas.igc.usp.br
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