 Incipient decay may develop in untreated pile tops within 1 year and reach the visible, advanced stage, termed rot, within 2 to 4 years and can extend 4 feet or more from the internally rotting areas of a Douglas-fir pile.A triangular blade scraper, a sharp shovel, or a dull probe are useful when inspecting piles for surface deterioration or marine borer attack because they allow the inspector to estimate the depth of deterioration.Because untreated wood can often be exposed while these tools are being used, a preservative solution or paste should be applied to exposed areas.