EPA review letter, 133-135 Greenwich Street

NYC 9/11 Public Portal Document

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Part 1: Work Plan — Decontamination/Deconatruction 133-133 Greenwich Street and 21-23 Thames Street a` Airtek Project 05-0701— Rev 3 September 16, 2005 / 1

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7.2 Part II - Soft Strip: ,,b j T The Soft-Strip will be ducted in negative full-containment as an asbestos project according to th C DEP Variancd for the project. Each building will be contained as one work area. Stairwells will not be contained and/or cleared separately. As noted in Section 6.0 "Clearance Criteria," each floor will be sampled individually and sealed at the stairwell upon completion of sampling. Sampling will then move sequentially down through the buildings from top to bottoi. Dust suppression will be conducted according to the stringent rules and 3gtlIafions governing asbestos projects. Exterior isolation barriers will be installed per the NYC DEP Variance.

All interior materials, including moveable objects, will be subject to abatement ~ and removal, and will be bagged and disposed of as ACM waste at a minimum. ~ Certain stainless steel kitchen fixtures and other impermeable materials may be `9 decontaminated by HEPA-vacuum and wet wiping. Efficacy of this decontamination will be determined by the Environmental Consultant as ' described in the Waste Management Plan (Submittal Part IV). All ceiling systems (plaster, tiles, sheetrock, etc.), wall systems (plaster, wall board, etc.), and floor ~Q systems, (tiles, carpet, etc.) will be removed and bagged for disposal as ACM waste at a minimum. Waste characterization testing as described in the WMP (submittal Part IV) will be used to make final waste determinations. Remaining structural members will be wet-wiped,_HEPA vacuumed, and encapsulated with a penetrating encapsulant. All interstitial spaces (i.e., chases, stud walls, etc.) will be accessed, wet-wiped, HEPA-vacuumed, and encapsulated. Operable windows will be articulated, wet wiped, HEPA-vacuumed, and encapsulated. o11a'Ji ~G ? - -- 3 nct ~.'t bv~:lt~~"'3 ~a~i1 bt -Aucx~~\ tr/e~ ~~ Foiivwing 2 and 3 cleanings and the settling periods, final air testing will be f conducted as detailed in "Clearance Criteria" above. Upon successful clearance air testing, the building will be turned over to the demolition contractor for conventional demolition.

7.3 Part III - In Place ACM:

In-place ACM has been identified as follows:

133-135 Greenwich Street:

a. Roof Flashing — 35sf b. Bulkhead Tar —10sf

21-23 Thames Street:

a. Roof Membrane — 350sf b. Flashing —100sf

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NYC-WTC 000134184