The extent of contamination at the site of Perth's planned sports stadium has prompted further investigations into whether the toxins pose a risk to human health and the environment.
Documents obtained by _The West Australian _ under Freedom of Information laws also show the extent of debris beneath the surface of the proposed site, on the northern part of the Burswood golf course, could never be fully known because of previous illegal, late-night rubbish dumping.
In February, it emerged that the site contained "uncontrolled fill" such as tyres, glass, rubber and tin cans to depths of up to 8m, which would make development difficult. However, the new FOI documents have further outlined the project's complexity, with one 1994 geotechnical investigation by Golder Associates for construction of the golf course clubhouse finding it would likely sink "in the order of 150mm (15cm) over a period of 30 years".
And in another tender document for groundwater quality investigations, dated September last year, soil sampling identified toxins such as polychlorinated biphenyl, which were used in fluids in paint, electronics and machinery and banned in 1975, at concentrations "exceeding ecological investigation levels".
Opposition Leader Mark McGowan said yesterday remediating the site would add "countless millions" to the cost of the stadium.
Sports Minister Terry Waldron said remediation costs were factored into the $700 million stadium budget.
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