12 JOHN STREET 1001103, 65/20

NYC 9/11 Public Portal Document SEP-11-2002 11:33 NYCDEP BANHM ASB/LEAD TRU 718 595 3648 P.10

Roof Clean.UQ protocol for cleaning roofs contaminated Application: This procedure utilizes wet methods and. careful hygiene with asbestos containing material (ACM). entry/access determinations. All abatement will be 1. The entire roof shall be considered the work area forDEP certified workers. performed by NYSDOL licensed contractors with NYC accumulations of visible debris, the clean-up areas shall be For non-gravel or stone covered roofs with localized specified ("specified area") by DEP. specified roof area for clean-up. For gravel/stone covered roof surfaces, the entire roof shall be included in thewashed. Water shall be collected, The gravelistone shall be taken to a clean-up staging area on the roof and filtered, and discharged into the drain/sewer as applicable. located on the roof immediately adjoining the roof 2. A changing area consisting of two adjacent step-off pads clean pad shall be adjacent to the entrance/exit. This area shall consist of a clean pad and a change pad. The exterior access). The change pad shall be building interior access way (or at the point of entry to the roof for shall consist of two layers of 10- adjacent to the contaminated roof areas. Each pad (change pad and clean pad) enough to facilitate changing and mil reinforced plastic on the roof/access way surface and shall be large the exact configuration will decontamination as described herein. A minimum of 4' x 4' is recommend, though be specific to the roof. point of entry to the roof) directly onto the 3. Workers shall first step from the building interior (or exterior at the disposable coveralls, plastic booties, clean pad. On the clean pad, each worker shall be double suited with gloves, and head coverings. Rubber boots may be used instead of the plastic booties. The boots shall be wet minimum of a half-face air- wiped and HEPA vacuumed prior to leaving the roof. Each worker shall wear a purifying respirator equipped with HEPA cartridges. in the clean-up shall be cleaned by 4. All penetrations at the roof within 10 feet of the specified roof area included wet methods/HEPA vacuum and sealed with 6-mil polyethylene sheeting. the entrance/exit. Roof cleanup shall begin at the entrance/exit and proceed in a path working away from release. Water shall be the primary engineering control to minimize the potential for fiber techniques with water, mops, rags, 6. Roof surfaces shall be wetted and then wet cleaned using wet wiping cleaning. brushes, etc. HEPA vacuuming may also be used as alternative to or in combination with wet shall observe the personal 7. Throughout the procedure, all personnel entering or existing the roof walking on or disturbance of decontamination practices. Attention shall be paid to limiting unnecessary strictly adhered to, in order to material on the roof. These personal decontamination procedures shall be minimize the potential for spreading contamination to the interior of the buildings. plastic furniture cushions, shall be wet 8. Solid nonporous objects, such as metal patio furniture, plant potters, and wiped, and lightly wiped with damp rags. Wooden objects such as decking shall be HEPA vacuumed, wet Woven materials shall brushed with a bristle brush utilizing simultaneous misting and local HEPA exhaust. with 29 CFR either be disposed as ACM or bagged and removed off-site for proper laundering in accordance waste unless the owner 1901. 1001. Potted plants with visual contamination should be disposed as ACM made to catch the requests decontamination. Potted plants will be repeatedly rinsed, and provisions shall be runoff water (i.e. into ACM disposal bags or by using rags and HEPA wet-vacuums). washed. 9. After completion of the above, the specified area roof shall be carefully Page 3 05/03/02

NYC-WTC 000094174