30 CFR § 250.1742
What other methods can I use to verify that a site is clear?
July 29, 2020
If you do not trawl a site, you can verify that the site is clear of obstructions by using any of the methods shown in the following table:
Open Table
| If you use . . . | You must . . . | And you must . . . |
|---|---|---|
| (a) Sonar, | cover 100 percent of the appropriate grid area listed in §250.1741(a), | Use a sonar signal with a frequency of at least 500 kHz. |
| (b) A diver, | ensure that the diver visually inspects 100 percent of the appropriate grid area listed in §250.1741(a), | Ensure that the diver uses a search pattern of concentric circles or parallel lines spaced no more than 10 feet apart. |
| (c) An ROV (remotely operated vehicle), | ensure that the ROV camera records videotape over 100 percent of the appropriate grid area listed in §250.1741(a), | Ensure that the ROV uses a pattern of concentric circles or parallel lines spaced no more than 10 feet apart. |
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