For example, the report said the Bureau should work with industry to develop a standardized procedure for a critical test of cement barriers, with a guide on how the results should be interpreted.

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Bartlit emphasized in his letter Thursday that cementing failures are a known hazard in the oil industry, with specific tests such as a "negative pressure test" and "cement evaluation logs" designed to identify cementing problems.

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The team then failed to run a test to establish that the cement seal was adequate.

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