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Law Department notice on WTC document preservation, Oct 2001

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Notice from NYC Law Department instructing staff to preserve World Trade Center documents for potential legal actions.

NYC-WTC_000145027–000145344

Folder label: “NO INFO

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NYC 9/11 Public Portal Document

4. The combustion riser shall be cleaned using a pressurized air/mechanical brush system in combination with a vacuum collection device. The direction of cleaning shall be from the roof down toward the second floor. (It is permissible to use a mechanical brush followed by application of pressurized air in lieu of combination style equipment.) The vacuum collection equipment shall be configured to maintain a minimum of 3000 feet per minute air velocity in the cleaning zone. (See Requirements Section for use of this equipment.) 5. Remove the roof cap if possible and place on a polyethylene sheet. Wet-clean by damp wiping in place or if removed, spray with Simple Green or a similar environmentally safe degreaser and hand wash as needed to remove adhered materials.

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NYC-WTC_000145221

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NYC-WTC_000145221Source: NYC Law Department, mirrored locally

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