sonic thickness measurements, increment borings, caliper measurements, etc.), and the degree of cleaning required. Therefore, estimates of time for Level III inspections are not included in Table 3-2.
Before starting a facility inspection, all available information about the facility should be obtained. As described in Section 1.4, this will usually require a preliminary visit to the facility by the UCT OIC. The OIC should meet with the local Public Works personnel and obtain copies of the facility drawings and general background about the existing condition of the facility. Any unique features or special problems that may be encountered should be noted. Local information that should be obtained include:
• Atmospheric temperature range.
• Water temperature range.
• Water visibility.
• Any condition that could have a direct impact on the time needed to perform an inspection, such as amount of biofouling growth on piles or any other condition that would inhibit the performance of an inspection such as ice or seasonal flooding.
• Ship traffic and facility berthing requirements.
The Public Works Officer can provide information about the local support, equipment, and utilities that can be made available to the UCT.
Once the information about the facility has been collected, an inspection plan should be developed. Of critical importance to the effectiveness of each survey is the proper and adequate selection of the areas to be examined. It is important to select a sufficient number of inspection areas to provide representative information on the overall structure. Making this selection requires an understanding of the facility structural behavior to determine which areas are subjected to maximum stress, fatigue, and impact forces. A knowledge of deterioration and damage theory is also useful. Consequently, the inspection plan must be prepared in cooperation with qualified engineers familiar with the structure. The inspection plan should include the identification of the inspection equipment most appropriate to the specific tasks.
For older facilities where little or no data, including drawings, is available, the inspection plan should allot time for developing and/or confirming the structural layout, and confirming whether previously identified repairs have been made.
The frequency of inspection will be dependent upon whether the inspection is surface or underwater, and the expected rate of deterioration and damage. A typical example requiring more frequent inspection is an area experiencing damage by ships berthing that results in advanced deterioration to both fender and structural piling. The frequency and level of inspection should, therefore, be closely tied to the historical deterioration rate of the facility. Recommended frequencies are listed in Volume 4 of NAVFAC MO-322, Inspection of Shore Facilities.
• All superstructure and piling/sheet piling above the waterline, including the splash and tidal zones (Figure 3-11), should be inspected annually.
• All concrete and steel structural members should be inspected at least every 6 years. Timber members should be inspected at least every 3 years. In areas with known active marine bores, the frequency for inspection of timber may warrant an underwater inspection in as little as every year.
For the results of the inspection to be useful, they must be documented in a clear and concise manner and in accordance with generally understood terminology. Inspection forms and reports should be completed as soon as possible after the inspection has been completed. Standard forms and report formats greatly facilitate the documentation procedure and are essential for comparing the results of the present inspection with past and future inspections. Figure 3-12 is a standard form for reporting the condition
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