20 Mr Garrett noted that Integral Energy said there are no existing plans to upgrade the feeder but if land uses change then there could be a proposal to modify the use of the line. In his conclusions he states:
"In terms of health, based on calculations and the information supplied by Integral Energy, the transmission line complies with the statutory requirements and guidelines for exposure to electromagnetic fields in all surrounding areas accessible by residents and the general public including adjoining residences. It should be noted that these requirements and guidelines are based on past scientific knowledge which may not necessarily reflect the latest research. To account for the continuing advancement of knowledge the international community, including the Australian Government and the World Health Organisation (WHO), advise the use of the precautionary principle."
Of specific concerns is the finding by the UK NRPB, which in fact is an advisory group, and replicated elsewhere of a possible doubling of the risk of leukaemia in children when exposed to a power frequency magnetic field of greater than 0.4 microtesla. The NRPB report concluded that from a review of studies conducted in a residential environment the possibility remains that high prolonged time weighted average exposure to power frequency magnetic fields can increase the risk of leukaemia in children. The report only considered studies based on residential exposure and it is the National Radiation Protection Board in terms of the abbreviation I provided.
21 Mr Garrett further states:
"Although magnetic fields of the order of 0.4 microtesla or more, up to .71, may occur at the boundary of the proposed before and after school child care centre the transmission line is typically in use for only eight days per year. Further, the children in care will be present for no more than three to four hours on those days. Given that the time weighted average of the studies considered by the NRPB would have been based on an exposure of at least eight hours per day residential exposure, it can be deduced that the time weighted exposure of the children in care would be less than half that of the studied group to less than an equivalent exposure level of 0.36 microtesla and then for only around eight days in the year. These figures don't change if this is a typical use per day as such."
22 Mr Grech on behalf of the respondent provided the Court with a public consultation draft of 7 December 2006, Radio Protection Standard, Exposure Limits for Electric and Magnetic Fields, this is a draft report. I have seriously considered the implications of the exposure and during the on-site hearing the parties were asked to formulate a condition such that the centre would cease operating in the event that there would be a change to the use of the transmission easement, that is if it was used for a greater voltage or if it was used on a permanent basis as such. This was also on the basis that the before and after school centre would cease to operate if there was scientific research established that a child care centre should not be located within fifty metres of an overhead dual circuit operating less than continuously.