Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:5:p5
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 5 (pt 5/10)
Character Range: 1452713–1455722

national SQGs given in the technical guidance document (ECB 2003). Eventually, all EU member states will develop SQGs and use the method recommended in the TGD (ECB 2003).

In the UK, soil guideline values (SGVs) represent 'intervention values' which, if exceeded, indicate potentially unacceptable risks to site users and therefore trigger further investigation. SGVs aim to be precautionary to ensure that all the potential sites of concern are captured at the screening stage.

The SGVs are derived by calculating a predicted no-effect concentration (PNEC) preferably using NOEC data or estimates of NOECs (larger effect toxicity data, for example, EC50, divided by a safety factor). The TGD (ECB 2003) recommends that, if possible, toxicity data should be normalised for the effect soil characteristics have on the toxicity of a contaminant.

The PNEC can be derived by three methodologies:
    1. the EqP methodology if no or very limited terrestrial toxicity data is available
    2. the AF approach if a limited data set is available
    3. a statistical extrapolation using an SSD method if sufficient data (more than 10 species from 8 taxonomic groups) is available.

For the SSD, the TGD  does not recommend a particular statistical distribution to be used in the SSD method. The output of the SSD is the HC5. Whether the HC5 value is protective is then assessed by the amount and type of toxicity data used in the SSD divided by an AF of between 1 and 5, depending on the uncertainties around the HC5.

Currently, the EU is performing environmental risk assessments on all the existing chemicals and these reports can be found online at www.ecb.jrc.it/.

An overview document is available for methodologies used for deriving soil screening values for individual European countries (Carlon 2007) and is available online at www.ies.jrc.cec.eu.int/fileadmin/Documentation/Reports/RWER/EUR_2006-2007/EUR22805-EN.pdf.

5.1.5         A5: Germany
The German Federal Soil Protection and Contaminated Sites Ordinance (BBodSchV 1999) provides a series of precautionary, trigger and action values to protect terrestrial ecosystems from adverse effects from soil contamination. These values are used to prevent future soil contamination and for remediation of contaminated sites.

Precautionary values indicate a potential future soil impairment that should be averted. For inorganic chemicals, precautionary values are derived for three soil types: sandy, siltloam and clay soils. For organic chemicals, precautionary values are derived for two soil types: soils with a humus content >8% and with a humus content ≤8 %. The ordinance does not give guidance on how to derive precautionary values.

Once the precautionary values have been exceeded, the ordinance (BBodSchV 1999) provides additional annual loading limits of the contaminants to prevent the soil concentration reaching the trigger or action values and causing adverse effects.

Trigger values trigger the investigation of the contaminated site to