30 CFR § 250.1742 - What other methods can I use to verify that a site is clear?
---
identifier: "/us/cfr/t30/s250.1742"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 250.1742 - What other methods can I use to verify that a site is clear?"
title_number: 30
title_name: "Mineral Resources"
section_number: "250.1742"
section_name: "What other methods can I use to verify that a site is clear?"
chapter_name: "BUREAU OF SAFETY AND ENVIRONMENTAL ENFORCEMENT, DEPARTMENT OF THE INTERIOR"
subchapter_number: "B"
subchapter_name: "OFFSHORE"
part_number: "250"
part_name: "OIL AND GAS AND SULPHUR OPERATIONS IN THE OUTER CONTINENTAL SHELF"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 1751, 31 U.S.C. 9701, 33 U.S.C. 1321(j)(1)(C), 43 U.S.C. 1334."
regulatory_source: "76 FR 64462, Oct. 18, 2011, unless otherwise noted."
cfr_part: "250"
---
# 250.1742 What other methods can I use to verify that a site is clear?
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:
| 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. |