Observational study along with previous investigation and records revealed that chromated copper arsenate type C (CCA-C) impregnated southern pine poles and piles of jetty constructed in most vulnerable brackish water in Bangladesh are stable and resistant to attack of all types of marine borers after 30 years of use. It is evident from the service records of other construction materials that CCA-C treated wood poles and piles treated at retention level of 20 kg/m3 dry oxides in an assay zone of 12mm to 50mm are significantly more safe and superior material in brackish water rather than marine construction made of untreated wood, leachable type of preservative (e.g., pentachlorophenol) treated wood, brick, rock, and even concrete of any type.

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