Law Department notice on WTC document preservation, Oct 2001

NYC 9/11 Public Portal Document

• Conducting work in accordance with the HASP. • Participating in daily safety meetings/planning. • Prompt reporting of all incidents and potential health and safety-related problems.

3.0 SITE AND PROJECT DESCRIPTION

3.1 Site Description The Site is located at 110 Liberty Street. It is five stories with 12 residential and six commercial spaces. It has been unoccupied since 9/11/01. The building was severely impacted in the WTC collapse. Dust and debris were deposited in the building, windows were blown out, as well as skylights. Residential spaces, the basement and the roof of the building were professionally cleaned shortly after the collapse. Two of the commercial spaces have “inches” of dust and all residential spaces have experienced varying degrees of dust re-deposition.

Rental spaces range in size from 1,000 to 1,300 square feet. They are open in design and consist of a kitchen, bathroom and sleeping area. Each space is heated by an individual hot water baseboard system. Window or roof mounted air conditioners are present in the residential space, central air systems are present in commercial spaces Unit 1 and 2. Rental spaces are accessible through from Liberty and Cedar Streets through common hallways. Floors are accessible via an elevator and stairs. Each floor has a trash compactor room and utility room. A laundry room is located on the 2“* floor. The basement contains the building trash compactor, elevator well, electric motor rooms, preparation and storage areas or the Chinese restaurant and a hair salon.

3.2 Project Description

The project’s objective includes evaluating the effectiveness of various cleaning procedures that may have been used in the residential spaces. The study will include 12 residential spaces and 3 commercial spaces. The two restaurants ad hair salon are not a part of the study, but will be cleaned at the completion of the study. Eight cleaning techniques will be evaluated:

1. Vacuuming with non-HEPA vacuums 2. Vacuuming with non-HEPA vacuums with Negative Air Machines (NAM) 3. Vacuuming with non-commercial HEPA vacuums 4. Vacuuming with non-commercial HEPA vacuums with NAM 5. Vacuuming with commercial HEPA vacuums 6. Vacuuming with commercial HEPA vacuiuns with NAM 7. Vacuuming heavy dust laden areas with commercial HEPA vacuums and 2 NAMs 8. Vacuuming heavy dust laden areas with commercial HEPA vacuums and 2 NAMs with vertical surface wet wiping and carpet shampooing.

Each cleaning technique will be evaluated on two rental units. Activities will include the following:

Mobilization to site

-001 WRS Infrastructure and Environment, Inc. 9

NYC-WTC_000145086