BS 10175 (7.6.2.5), which the Council and Greater Manchester Geological Unit claim to have complied with in their April 2006 investigations, states that a high density of sampling grid can also be necessary where a high level of confidence is required for the outcome of a risk assessment. Presumably, for 550 primary school pupils and 78 babies directly on top of a still gassing former toxic waste dump a high level of confidence would be required. Apparently not!