An NBC is the upper confidence limit of the 95th percentile, providing a conservative estimate of the background concentration over a given area accounting for geogenic and diffuse sources of pollution (Cave et al., 2012 and Ander et al., 2013). NBCs have recently been introduced into the contaminated land regime in England and Wales under Part 2a of the Environmental Protection Act 1990 (EPA) (as amended) by secondary statutory guidance in each country (DEFRA, 2012). The regime supports the derivation of normal levels of contaminants as a way of identifying concentrations that represent low rather than unacceptably high levels of risk. NBCs should not be used in support of the National Planning Policy Framework (NPPF), which states that the developer or site owner needs to ensure the land is safe for its intended use. (Paragraph 121: CLG, 2012). The data underpinning the NBCs could contribute to one of many lines of evidence that may be used to assist with risk-based land management under these and other regimes (Environment Agency, 2004).