In a project funded by the Water State Authorities (RWS) and the Noordoostpolder Water Board, the residual retentions in ten creosote treated Scots pine (Pinus sylvestris) poles were examined after 45 years ground contact service along a canal (Lemstervaart) in the Dutch Noordoostpolder. The Lemstervaart location was selected due to the fact that the poles involved had been originally treated and placed in situ by Dr. T. Hof of TNO in 1948 and thus possessed detailed treatment histories. A total of five samples were sawn from each pole (50 in total) and subsequently extracted, using the American standard (AWPA A6-89) "Method for the determination of oil-type preservatives and water in wood". The results of these analyses and the variation in results due to chip-size, sample-size and incomplete extraction are discussed.

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