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OSHA Crane Inspection Report and Analysis Oct 2001

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Joint OSHA and Bechtel crane inspection report analyzing safety conditions at the World Trade Center site.

NYC-WTC_000149936–000149977

Folder label: “OSHA_COSH

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NYC 9/11 Public Portal Document

Lihicrty Mutual. WTC INDUSTRIAL HYGIENE INFORMATION

Date: 03/07/2002

To: Bovis/AMEC - Ray Master DDC- Bob Adams

CC: LMIG- John Rabovsky LMIG- IH File

From: Mike Ramsey

RE: Supporting Data for H2S Continuous Monitoring Recommendation

Enclosed is supporting data for our recommendation for continuous hydrogen sulfide measurements in trenches. This information was requested by attendees of past safety meetings.

The table below summarizes the results of the samples collected so far.

Hydrogen Sulfide Results Summary

Total Number Total Total Above Type of Sample Collected Detectable Limit

Time Weighted Average, Area 48 7 1 Time Weighted Average, Personal 31 3 0 Instantaneous, Direct Reading * 5 2

* The direct reading results are not in electronic format, so the total number is not easily retrievable. Therefore, it is not being reported here.

The samples having detectable results were extracted from our database and are listed in the attached spreadsheet.

While the number of samples above the exposure limit is small, we are detecting quantifiable concentrations of hydrogen sulfide periodically. Because it is being detected and because of the anecdotal reports of hydrogen sulfide odors that have been heard from workers on the site, we believe that seepage of hydrogen sulfide into below grade excavations is a distinct possibility.

Because of this possibility of seepage and because of the particularly dangerous properties of hydrogen sulfide, we recommended continuous monitoring of hydrogen sulfide during below grade work.

We will distribute this data at next week’s safety meetings along with our regular summary of industrial hygiene measurements.

1

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