19 June 2001
Figure 5-11 Timber Structures and Attachments (Below Water) Checklist
___ Start at the splash/tidal zones. Note: A Level I inspection should be done
first to identify areas of mechanical damage, repair and new construction.
___ Clear a section of the structure of all marine growth and visually inspect it
for surface deterioration. This is done at spot locations rather than cleaning
the entire structure.
___ Sound the cleaned area with a hammer and carefully probe with a thin-
pointed tool, such as an ice pick.
___ If an area is in question, take a small boring for laboratory analysis using an
increment borer. Plug the hole with a creosote treated plug to prevent easy
access for marine borers.
___ Descend down to the pile, sounding the structure with a hammer wherever
there is minimal marine growth, as well as probing carefully with an ice
___ At the bottom, note and record the depth of the water on a Plexiglas slate
with a grease pencil.
___ Record visual observations, i.e., the presence of marine borers, losses of
cross-sectional area, organism-caused deterioration, location and extent of
damage, alignment problems, and condition of fastenings. Use calipers
and scales and required.
___ Use ultrasonic techniques if internal marine borer damage is suspected.
Ultrasonic techniques are available to support the underwater inspection
___ After finishing the underwater work, return to the surface and record all
data into the inspection log. Similar procedures would be followed for
timber retaining walls.