Ground & Water utilised a hand-held XRF analyser to obtain the concentrations of lead in over 90 locations, both in-situ and in the stockpile, in just one day. With the results showing that out of the 90 tests only 2 or 3 locations showed levels of lead anywhere near the original testing, it was deemed reasonable to suggest that the original tests were either spurious or isolated. Further confirmatory laboratory testing was undertaken, which conformed to initial observations. Now we had results from 120 lead tests. We needed to find a fast and effective way to evaluate them.
In September of this year Professional Guidance – Comparing Soil Contamination Data with a Critical Concentration – was published. Ground & Water has worked hard to review the guidance and develop in house procedures to ensure compliance. This in-house methodology was used to analyse the lead data set and it was clear that the Topsoil was in fact suitable for use.