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If an area is in question, take a small boring for laboratory analysis using an increment borer. Once the core is extracted, seal the hole with a creosote-treated plug to prevent easy access of borers to the interior of the pile.

NOTE: An engineer should be present whenever underwater inspections are made to explain to the diver exactly what he should look for: number and size of piles, type and depth of bulkheads, location of tiebacks, and cross bracing. The engineer shall evaluate the diver's observations and determine the degree of hazard.

• Clean small areas with wire brushes and scrapers. Refer to Section 2.3 for information on marine growth removal.

• Sounding of the structure can be performed using a 3-pound sledge hammer.

• An ice pick or pick hammer is required for probing and an increment borer is required if cores are to be taken.

• Timber element dimensions can be checked using a ruler or tape measure.

• A simple fabricated or purchased caliper, as illustrated in Figure 3-63, is very effective for measuring the diameter of piles.

Inspection data can be recorded underwater using a Plexiglas slate with a grease pencil. Permanent documentation can be achieved through the use of underwater photography, either still photo or television.

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