Site identification record, 74-90 Church Street, Oct 2001

NYC 9/11 Public Portal Document

De 07 01 05:14p Rirtek Environmental Corp (2121766-0759i` :

accordance with applicable regulatory mats. Filter water used for showering all

and cleaning equipment through a 5-micron filtration system. Dispose of water in the sanitary sewer system.

4.6 Provide temporary connection to existing building utilities or provide temporary facilities as required or as necessary to carry out the Work.

5.0 NEGATIVE PRESSURE SYSTEM

5.1 If needed provide fully operational diminished air equipment to be used as needed in each work area while cleanup procedures are in affect. The exhaust of the negative pressure system shall be directed outside of the building.

5.2 Allow exhaust units to run until completion of work area cleanup.

5.3 When a final inspection and the results of final air tests indicate that the area has been decontaminated, HEPA filtration system shall be removed from the work area in conjunction with the isolation barriers.

5.4 A minimum of 6 air changes per hour is specified in negative pressure zones.

6.0 WORKER DECONTAMINATION PROCEDURES

6.1 Require all workers to adhere to the following personal decontamination procedures whenever they leave the work area:

a) When exiting area, remove outer layer of disposable coveralls, disposable head covers, and disposable footwear covers or boots in the first airlock at the exit of the tent enclosure.

b) Still wearing respirators and remaining layer of disposable covering, proceed to remote shower unit and follow procedures as outlined for worker decontamination.

7.0 CONTAMINATED DUST REMOVAL

7.1 All surfaces within each respective work area shall first be cleaned with a HEPA vacuum followed by wet wiping with amended water. When dry the area shall be cleaned again using a HEPA filtered vacuum.

7.2 All items that will not be physically removed shall be cleaned ,and decontaminated and left in-place. Coordinate with Tenant Representative prior to discarding any items that cannot be decontaminated.

7.3 All non-porous personal items on work desks shall be HEPA vacuumed, wet wiped and again HEPA vacuum before removal.

7.4 All porous personal items such as clothing, leather items, footwear, books, phones/cell phones, stuffed animals, pencils and cardboard must be discarded.

Abtek Envlrmrmetttal Corp. PAGE6 ,Legal Aid Society 90Church Street

NYC-WTC 000124626