NYC-WTC_000232249

NYC 9/11 Public Portal Document

1.2 Project Purpose and Objectives

The principal purpose of the air monitoring program is to monitor air quality in the vicinity of 130 Liberty Street during the deconstruction of the building on that property. The Proposed Plan consists of monitoring of fugitive dusts in the vicinity of the deconstruction site on both a real­ time or continuous basis as well as a time-weighted or integrated basis.

Principal objectives of the program are as follows:

• Monitor dusts as PMio on a real-time or continuous basis such that fugitive dusts associated with the building deconstruction are maintained below predetermined action levels.

• In the event that fugitive dusts levels exceed predetermined action levels, building deconstruction management personnel will be immediately notified so that all necessary corrective actions can be taken.

Monitor PMio on a time weighted or 24-hour average basis to provide assurances that levels of respirable particulate matter associated with the deconstruction are below National Ambient Air Quality Standards (NAAQS) of 150 ug/m \

• Collect particulate matter on a time-weighted or integrated basis such that samples are available for monitoring of target compounds potentially associated with World Trade Center dust (e.g., asbestos, lead).

• Compare measured concentrations of project target parameters to action levels established on a compound specific basis. In the event that measured concentrations exceed any project specific action level for one or more of these target compounds,appropriate corrective actions immediately will be taken.

1.3 Overview of Air Quality Monitoring Programs and Features

• There are multiple aspects and levels to the overall air monitoring program proposed for the deconstruction of 130 Liberty Street. The following is a brief summary of the three (3) components or levels of air monitoring proposed for the project:

“Level 1”: The subcontractors perfonning aspects of Phase I deconsti-uction work (largely interior, non-structural efforts) will be responsible to collect air samples on their personnel directly performing various work activities to determine airborne levels of contaminants potentitally generated by the work at the source as required by OSHA.

“Level 2”: The next layer of sampling is for ICR 56 compliance. ICR 56-required sampling will be perforaied by the Contractor third party consultant who will sample the ambient air inside the building during Phase I work outside of work areas, at the personnel and waste load out decontamination stations and other locations. In addition, samples will be collected outside the building within ten (10) feet of the negative pressure ventilation exhaust. This sampling is further described in the Asbestos and COPC Abatement and Removal Plan.

L2005-149 (051205) 2 5023623.2

C ITY_D E P_WO RB Y_C AN N ATA_SU B P_000114884

NYC-WTC_000232253