Law Department notice on WTC document preservation, Oct 2001

NYC 9/11 Public Portal Document

Changes to the Work Plan

1. WET WIPING

1.1 Wet Wipe Using Windex® / Wet Wipe Using Water Only The work plan initially called for use of soap and water to accomplish wet wiping. Windex® brand was used because it is a commonly used cleaner believed to be readily available in most people’s homes. Further, it is non-damaging to most surfaces, from wood to fiberglass. Typically, this soap does not “over-suds.” It provides an effective detergent-based protection of surfaces when combined with cold water. This was important, because hot water was not immediately available at the project site. During the project, EPA opted to also evaluate application of wet wipe using water only. Water only was used on the desktop in the Chiropractor’s Office, in the bathroom of the Chiropractor’s Office, and in the entire Barber Shop. Water only was also used on the vinyl tiles under the carpeted area in the Mattress Store.

1.2 Horizontal Wet Wipe Only / Horizontal and Vertical Wet Wipe The majority of tests of cleaning methods were accomplished using horizontal wet wipe only, to assist in determination of whether vacuuming without wet wiping would result in acceptable cleaning. However, application of both horizontal and vertical wet wipe was tested in Units 3B and 3C.

Application of both horizontal and vertical wet wiping in Unit 3B was consistent with the procedures called for relative to testing of Scope A, Lower Manhattan Cleaning Procedures. (Attachment F).

Unit 3C was selected for additional tests of the use of both horizontal and vertical wet wiping. The unit was selected for the following reasons: • The apartment was heavily impacted by WTC dust • The apartment was folly fomished and contained many personal belongings, and • he test of vacuuming method called for use of equipment without HEPA filter or AFD. Additionally, the resident had expressed the intention to return.

1.3 Use of Swiffer® Brand Cloths EPA opted to evaluate use of Swiffer® brand cloths for application of wet wipe. Swiffer® brand cloths were utilized during the cleaning of residential unit 5D.

2. SCOPE A- LOWER MANHATTAN CLEANING PROCEDURES

See Attachment F.

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