NYC-WTC_000233286

NYC 9/11 Public Portal Document

(i) Where Allowed. Negative pressure tent enclosures are allowed to be utilized for gross abatement of any quantity interior and exterior non-friable ACM or asbestos material, glovebag abatement of any quantity friable TSI, or gross abatement of Minor and Small quantities of friable ACM, PACM or asbestos material. For tent enclosures with gross abatement of friable materials, attached (contiguous) decontamination system enclosures shall be constructed, maintained and utilized as per this Part.

(a) Multiple Minor Size Regulated Abatement Work Areas. If the small or large asbestos project consists of multiple negative pressure tent regulated abatement work area enclosures with minor quantities of ACM to be abated within each tent enclosure, these tent enclosures shall be constructed as per this subpart, including attached airlock if remote decontamination systems are allowed and utilized for the asbestos project.

(ii) Tent Construction. (a) Tents with greater than 20 square feet of floor space, or tents that are scheduled for gross removal of friable ACM, PACM, or asbestos material, shall be constructed of two (2) layers of six (6) mil fire-retardant plastic sheeting and shall include walls, ceiling and a floor (except for portions of walls, floors and ceilings that are the removal surface) with double­ folded seams. Seams shall be duct taped airtight and then duct taped flush with the adjacent tent wall. (b) Tents with 20 square feet or less of floor space and no gross removal of friable ACM, PACM or asbestos material, shall be constructed of one (1) layer six (6) mil fire-retardant plastic sheeting and shall include walls, ceiling and a floor (except for portions of walls, floors and ceilings that are the removal surface) with double-folded seams. Seams shall be duct taped airtight and then duct taped flush with the adjacent tent wall. (c) Tents or tent-like structures or enclosures shall be adequately supported and reinforced to withstand local environmental conditions and the negative pressures developed within them. (d) Airlock. An airlock shall be constructed as per section 56- 7.5(b)(11), at the entrance to each tent that utilizes remote decontamination system facilities. Each tent and airlock shall be cordoned off twenty-five (25) feet from it perimeter, or the interior space/room where the tent and airlock is located shall be secured from non-certified personnel or

12 NYCRR56 Subpart?, Page 68

CITY_21MC100_003235088

NYC-WTC_000233354