EPA review letter, 133-135 Greenwich Street

NYC 9/11 Public Portal Document

Mr Rajappan Radhakrishnan — NYC DEP 133-135 Greenwich Street Variance Request Airtek Project 05-0701— August 11, 2005

Exterior: We are requesting a variance from the following subsections to facilitate the decontamination of the facade: Section 1-81(j) No pre-cleaning of the work area(s) Section 1-81(m) Partial plasticization of the work area(s) Q0O Section 1-82(a) & 1-83(a) Remote decontamination facilities Section 1-91 No negative air Section 1-112(d) & 1-112(e) No 14 & 2nd settling period and no 2nd & 3rd cleaning The exterior of the building was decontaminated as a part of the NYC DEP Building Exterior Cleaning Program following 9/11/01. Airtek's visual inspection of the facade indicates that it is advisable to conduct low-pressure power washing prior to ink+a I ' demolition activities. The exterior of the building will be cleaned in accordance with the NY DEP WTC Dust/Residue Roof & Façade Cleaning Procedures._ and 4 h e pp r Oced u. r`eS Interior .w. o %; 1- v Par R 0 v15 eA W o r tc P1&, 4o , A bgje w~ mil- &d t 33- 13 S Care-€r ) '01,S4- C4 T.t-Z'3 Tk&W S creek, Phase 1— Soft Strip: We are requesting a variance from the following subsections: Section 1-125(i) Isolation Barriers We request relief from 1-125(i): Isolation Barriers. It is the intent of the project to seal all windows and communicating openings to the outside of the building from the outside with two layers of 6-mil poly and plywood barriers. The intent of this action is to create a sealed structure that will allow decontamination activities within the building while reducing the possibility of migration of dust to the outside of the struct e ~ ltitr r >~.dck -~ _o Gt~ cA-a 0~IX11 All interior materials, including moveable objects, will be subject to de9pntnination and L -L removal or, if porous, will be bagged and disposed of as ACM waste. ceiling systems f 6 ' O Qi (plaster, tiles, sheetrock, etc.), wall systems (plaster, wall board, etc.), andloor ms, occord0~~ (tiles, carpet, etc.) will be removed and bagged for disposal as ACM waste. Remaining par-f structural members, pipes, boiler, freezer boxes and roof mounted HVAC units will be S}e wet-wiped, HEPA vacuumed, and encapsulated with a penetrating encapsulant. All Mai► ~ae~4 a eessib4e interstitial spaces will be wet-wiped, HEPA-vacuumed, and encapsulated. Qka✓'r Operable windows will be articulated, wet wiped, HEPA-vacuumed, and encapsulated. Full worker and waste decontamination facilities will be attached to the entrance on Thames Street. The decontamination facilities will comply with NYC DEP Title 15 §1- 82 & §1-83.QQtp p 4 — a-V re — / -o be used. C Ar ee~~ use .t eats 1r C- Phase II - In Place Exterior A p t ~•k~an , ~.•s ~1 t _ g ~ .1~, ~4(~1 ~•P We are requesting a variance from the following subsections for the roofing materials: -toe perCorrn&9 Section 1-41(c) During abatement air sampling inside the work area v1 -scL2 Section 1-41(d) No post abatement clearance air monitoring Section 1-102(b) Not to fully saturate ACRM with amended water , (A 5t a4 f ow,.,

ENVIRONMENTAL CONSULTANTS

NYC-WTC 000134191