Miles Vulnerability assessment of groundwater monitoring ... Vulnerability assessment of groundwater

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  • Vulnerability assessment of groundwater monitoring data and context setting for EU- wide, zonal and national registration

    Ben Miles, BASF SE

    17th European Modelling Workshop, Vienna22.10.2014

  • Background: FOCUS GW (European Commission 2014, coming into force in 2015)

     For use of groundwater monitoring data at Tier 4 (EU or country level) there is requirement for quality criteria to be met, particularly

     good characterisation of groundwater hydrology

     demonstrating connectivity between treated topsoil and the point of sampling of the groundwater

     demonstrating that relevant products have been used for a sufficient number of years in relation to the expected solute travel time to the aquifer (estimation should be robustly supported)

     Overall exclusion of false negatives (and false positives)

    27th European Modelling Workshop, Vienna22.10.2014

  • Background: FOCUS GW (European Commission 2014, coming into force in 2015)

     At EU level, “a safe use” must be demonstrated to exist within the EU, covering a significant area in the context of one or more of the representative uses assessed

     Reservations remain whether current knowledge on groundwater hydrology at the EU level, would be sufficient to use monitoring data to ever conclude that “safe use” might cover an extensive area for the EU evaluation

    37th European Modelling Workshop, Vienna22.10.2014

  • How to address the requirements for use of monitoring data?

     How can we address the quality criteria at the scale of individual monitoring sites?

     Having demonstrated leaching vulnerability and connectivity of sampled wells to treated fields and excluded false negatives, how can we assess representativity for a wider area of use (i.e. demonstrate safe use)?

     Is lack of knowledge on groundwater hydrology at the EU level a significant problem?

    47th European Modelling Workshop, Vienna22.10.2014

  • Combined approach working at different spatial scales

    57th European Modelling Workshop, Vienna22.10.2014

    Local scale: Monitoring site analysis

    Combined analysis for RA showing relevance of monitoring data and setting monitoring sites/data in context for wider usage area (EU, Zone, Country…)

    Large scale: Context setting, wider use area

    What we use

    What we want to achieve

    What we get

    What we do

     monitoring site data  monitoring results

     monitoring site data  GIS data

     detailed hydrogeological site characterisation  farmer surveys for product usage  vulnerability assessments for wells  Site specific modelling (soil column & aquifer)

     GIS spatial analysis  GW vulnerability mapping using both site

    specific and latest EU-wide spatial data  Relevance assessment in EU context

     Representativeness in spatial context  Comprehensive analysis:

    use area – gwm sites – FOCUS scenarios

     Vulnerability of monitoring sites  Relevance of monitoring data  Information on leaching behaviour

    Work at two scales

    What we use

    What we want to achieve

    What we get

    What we do

  • In relation to current tiered assessment scheme

    67th European Modelling Workshop, Vienna22.10.2014

     Approach combines Tier 4 with Tier 3b, includes elements of 3c and 3d

  • Monitoring site characterisation: Vulnerability and product applications

     Monitoring site might be a monitoring well from existing public network or dedicated well installed at edge of field

     For a monitoring well from existing public network the characterisation depends on available data

    77th European Modelling Workshop, Vienna22.10.2014

     Geological profiles,

     hydrogeological characterisation,

     identification of relevant fields and

     farmer surveys for product application history

  • Monitoring site characterisation: Vulnerability and product applications

     Monitoring site might be a monitoring well from existing public network or dedicated well installed at edge of field

     For a monitoring well from existing public network the characterisation depends on available data

    87th European Modelling Workshop, Vienna22.10.2014

     Geological profiles,

     hydrogeological characterisation,

     identification of relevant fields and

     farmer surveys for product application history

    0.0

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    -1.5

    Construction DetailsBorehole Lithology

    0.0

    -5.15

    Protective cover

    Concrete foundation -0.6

    -4.4

    Man made

    Gravely sand

    -6.0

    Boulder Clay

    Ground surface

    -0.8

    +0.3

    +0.8

    Solid casing

    Bentonite fill

    Filter gravel

    Slotted casing

    Sump

    Bentonite fill

    -5.0

    -4.5

    -5.0

    -5.5

    -6.0

    -1.3

    -1.5

    Construction DetailsBorehole Lithology

  • Monitoring site characterisation: Vulnerability and product applications

     Monitoring site might be a monitoring well from existing public network or dedicated well installed at edge of field

     For a monitoring well from existing public network the characterisation depends on available data

    97th European Modelling Workshop, Vienna22.10.2014

     Geological profiles,

     hydrogeological characterisation,

     identification of relevant fields and

     farmer surveys for product application history

    0.0

    -5.15

    Protective cover

    Concrete foundation -0.6

    -4.4

    Man made

    Gravely sand

    -6.0

    Boulder Clay

    Ground surface

    -0.8

    +0.3

    +0.8

    Solid casing

    Bentonite fill

    Filter gravel

    Slotted casing

    Sump

    Bentonite fill

    -5.0

    -4.5

    -5.0

    -5.5

    -6.0

    -1.3

    -1.5

    Construction DetailsBorehole Lithology

    0.0

    -5.15

    Protective cover

    Concrete foundation -0.6

    -4.4

    Man made

    Gravely sand

    -6.0

    Boulder Clay

    Ground surface

    -0.8

    +0.3

    +0.8

    Solid casing

    Bentonite fill

    Filter gravel

    Slotted casing

    Sump

    Bentonite fill

    -5.0

    -4.5

    -5.0

    -5.5

    -6.0

    -1.3

    -1.5

    Construction DetailsBorehole Lithology

  • Monitoring site characterisation: Vulnerability and product applications

     Monitoring site might be a monitoring well from existing public network or dedicated well installed at edge of field

     For a monitoring well from existing public network the characterisation depends on available data

    107th European Modelling Workshop, Vienna22.10.2014

     Geological profiles,

     hydrogeological characterisation,

     identification of relevant fields and

     farmer surveys for product application history

    0.0

    -5.15

    Protective cover

    Concrete foundation -0.6

    -4.4

    Man made

    Gravely sand

    -6.0

    Boulder Clay

    Ground surface

    -0.8

    +0.3

    +0.8

    Solid casing

    Bentonite fill

    Filter gravel

    Slotted casing

    Sump

    Bentonite fill

    -5.0

    -4.5

    -5.0

    -5.5

    -6.0

    -1.3

    -1.5

    Construction DetailsBorehole Lithology

    0.0

    -5.15

    Protective cover

    Concrete foundation -0.6

    -4.4

    Man made

    Gravely sand

    -6.0

    Boulder Clay

    Ground surface

    -0.8

    +0.3

    +0.8

    Solid casing

    Bentonite fill

    Filter gravel

    Slotted casing

    Sump

    Bentonite fill

    -5.0

    -4.5

    -5.0

    -5.5

    -6.0

    -1.3

    -1.5

    Construction DetailsBorehole Lithology

    catchment

    GW Flow

  • Monitoring site characterisation: Site specific modelling

     Is the monitoring timeframe and sampling interval appropriate?

     Can measured concentrations at the monitoring well be linked to known product applications?

    117th European Modelling Workshop, Vienna22.10.2014

    C Weather, crop and application data

    Leaching simulation

    GW flow Hydrogeological data

    time

    GW flow and transport model

    Soil data

  • Monitoring site characterisation: Site specific modelling

     Leaching models (e.g. PEARL) parameterised for the treated fields give us expected timeframe and concentration signal for breakthrough at groundwater surface after application

     To look at the expected concentration signal at the well for the monitoring period and make the link between measured concentrations and product applications 2D (or 3D) flow and transp