Agreement for exterior cleanup, 94 Greenwich Street, Oct 2002

NYC 9/11 Public Portal Document OCT-24-2002 09 13 NYCDEP BANHM ASB/LEAD TRU 718 595 3648 P.08

cleaning roofs contaminated Application: This procedure utilizes wet methods and careful hygiene protocol for with asbestos containing material (ACM). determinations. All abatement will be 1. The entire roof shall be considered the work area for entry/access performed by NYSDOL licensed contractors with NYC DEP certified workers. the clean-up areas shall be For non-gravel or stone covered roofs with localized accumulations of visible debris, specified ("specified area") by DEP. area for clean-up. For gravel/stone covered roof surfaces, the entire roof shall be included in the specified roof be collected, The gravel/stone shall be taken to a cleanup staging area on the roof and washed. Water shall filtered, and discharged into the drain/sewer as applicable. immediately adjoining the roof 2. A changing area consisting of two adjacent step•off pads located on the roof entrance/exit. This area shall consist of a clean pad and a change pad. The clean pad shall be adjacent to the building interior access way (or at the point of entry to the roof for exterior access), The change pad shall be adjacent to the contaminated roof areas. Each pad (change pad and clean pad) shall consist of two layers of 10- tnil reinforced plastic on the roof/access way surface and shall be large enough to facilitate changing and decontamination as described herein. A minimum of 4' x 4' is recormnend, though the exact configuration will be specific to the roof

3. Workers shall first step from the building interior (or exterior at the point of entry to the root) directly onto the booties, clean pad. On the clean pad, each worker shall be double suited with disposable coveralls, plastic gloves, and head coverings. Rubber boots may be used instead of the plastic booties. The boots shall be wet wiped and HEPA vacuumed prior to leaving the roof Each worker shall wear a minimum of a half-face air- purifying respirator equipped with HEPA cartridges.

4. All penetrations at the roof within 10 feet of the specified roof area included in the clean-up shall be cleaned by wet methodslliEPA vacuum and sealed with 6'mil polyethylene sheeting.

5. Roof cleanup shall begin at the entrancelexit and proceed in a path wonting away from the entrancelexit. Water shall be the primary engineering control to minimize the potential for fiber release. 6. Roof surfaces shall be wetted and then wet cleaned using wet wiping techniques with water, mops, rags. brushes, etc. HEPA vacuuming may also be used as alternative to or in combination with wet cleaning.

7. Throughout the procedure, all personnel entering or existing the roof shall observe the personal decontamination practices. Attention shall be paid to lindting unnecessary walking on or disturbance of material on the roof. These personal decontamination procedures shall be strictly adhered to, in order to mnnimizae the potential for spreading contamination to the interior of the buildings.

8. Solid nonporous objects, such as metal patio furniture, plant potters, and plastic furniture cushions, shall be wet wiped with damp rags. Wooden objects such as docking shall be HEPA vacuumed. wet wiped, and lightly brushed with a bristle brush utilizing simultaneous misting and local HEPA exhaust. Woven materials shall either be disposed as ACM or bagged and removed off-site for proper laundering in accordance with 29 CFR owner

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NYC-WTC 000128457