ESI Ltd has recently released the Contaminated Land Statistics Calculator to aid the effective dissemination and take-up of the new national guidance on the use of statistical tests in the assessment of soil contamination data (www.claire.co.uk). The aim of the guidance is to increase the understanding of practitioners of the role that statistics play in quantifying the uncertainty around estimates of average contaminant concentrations. It is the first part of new and revised guidance promised by DEFRA’s ‘Way Forward’ in 2006, and ESI contributed to the development of this guidance on behalf of Defra.

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ESI recently provided a software tool application for the statistical tests to support the local authorities of England and Wales on behalf of the Chartered Institution of Environmental Health (CIEH). The new ESI Statistical Calculator provides the same functionality as the tool provided to CIEH members, so practitioners can use the software with confidence that the answers they obtain will be the same as those that would be obtained by a local authority.

CIEH (Chartered Institute of Environmental Health) Statistics Calculator

The software is designed to answer the following questions:

	How does my site concentration data compare to a critical concentration or threshold of relevance to my site?
	Does my data provide confidence that concentrations are definitely below or above a critical concentration?
	Do I have enough samples to demonstrate that remediation is or is not required?

The new guidance sets out step-by-step procedures for conducting statistical tests when assessing soil data in the context of either the land use planning system or Part 2A of the Environmental Protection Act 1990. The intention is that the statistics calculator will help users to conduct these statistical techniques when comparing soil contamination data to a critical concentration as part of wider contaminated land risk assessment projects in both of these legal contexts.

The statistics calculator consists of a series of linked Excel-based, macro-supported worksheets which allow fast and efficient data processing. Several data sets can be analysed in the same workbook, to optimise your work flow.

The statistics calculator comes with a full manual, with examples on how to implement the tests in the national guidance. Please contact ESI for information on multiple-copy discounts which are available to the same organisation within the same country.

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