Revealed that chromated copper arsenate type C (CCA-C) treated southern pine poles used in Central Warehouse Jetty of REB, Khulna are stable and resistant to chemical and biological attack without loss of any component from outer 0-12.5 mm zone after 15y of use. Slightly reduced retention (4.44% less) was noted in above water location of piles (bottom end of tree) which would be due to continuous weathering, torrential rain and genobiotic activities in jetty for a long time. The retention of recent southern pine poles (1.5y old) was w/w 4.17% (sd 0.0684) in 0-12.5mm assay zone compared to w/w 4.95% (sd 0. 1286) in under water location and w/w 4.73% (sd 0. 1137) in above water location of 15y old jetty piles. Such a preservative treated wood poles and piles are more safe in brackish water rather than other constructional materials.

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