Re-occupancy recommendations for 170 Broadway, Sep 2001

NYC 9/11 Public Portal Document FEB-25-2002 1803 HYGIENETICS NYC 212 244 0505 P.06/21

H eneticsw W ronmental Hygienetles Environmental Services, Inc. I West 34th Street Phone:(212)244-3443 7th Floor Fax:(212)244.8508 Now York, NY 10001

September 21, 2001

Ms. Peggy Nash Sent Via Facsimile General Manager (212) 791-9839 Jones Lang LaSalle 170 Broadway New York, NY 10038

RE: Recommendations for Post Clean-Up Re-Occupancy — 17i1 Broadway, New York, NY

Dear Ms. Nash:

Hygieneties Environmental Services, Inc. (Hygienetics) offers the following recommendations regarding general building operations and recommended tenant activity restrictions upon re- opening of the building for general tenant use:

In order to minimize tracking in of dirt and debris from the building exterior, deploy entry way mats at both the Broadway and Maiden Lane entrances to the building. Optimally, deploy an entry mat between the outside and inside entry doors at each of these entrances. These mats should be periodically lightly misted with water, to maximize removal of dirt and debris from tenants' shoes. Additional (dry) mats should be installed inside both entryways to the building, as well as throughout the elevator lobby, to maximize capture of tracked-in dirt.

These mats should be cleaned as necessary, using a High Efficiency Particulate Air (HEPA) filtered vacuum, to capture any residual asbestos fibers and any other fine particulate matter tracked into the building. (In accordance with Jones Lang LaSalle's "Hands Off' policy with respect to asbestos-containing materials, coordination of these HEPA vacuuming activities with a NYS Licensed asbestos contractor may he appropriate).

Similarly, all elevator cars should also be HEPA vacuumed on an as-needed basis, to minimize any spread of tracked in dirt.

Stairwell doors should be kept closed throughout the building, to minimize movement of building air from floor to floor.

All Package HVAC units throughout the building should have their outside air dampers manually shut/scaled, with linkages either disconnected or locked in the closed position, to preclude

NYC-WTC 000105738