EPA review letter, 133-135 Greenwich Street

NYC 9/11 Public Portal Document

Part!! - Environmental Community Monitoring Plan 133-135 Greenwich & 21-23 Thames Streets Airtek Project 05-0701— Rev 2 September 16, 2005 ` G v- '

will be notified promptly. The community air monitoring locations will not be m moved until NYCDEP and the USEPA Region 2 office accept the change. 1 o f 3.3 Abatement Phase Work Area Monitoring

Air monitoring per the requirements of NYC DEP Title 15 will be conducted with R- 46 the exception that Transmission Electron Microscopy (TEM) will be utilized as D Ot' the analytical method for asbestos. Sample locations will be selected by the Site Hygienist in accordance with Title 15 and based on the configuration of the --~ abatement containment areas. Containment area monitoring of additional Contaminants of Potential Concern (COPCs) that are not regulated under Title 15 ç`~ will be conducted voluntarily by the Owner. The COPCs to be monitored are: , Metals (ICP- and crystalline silica ).

This monitoring is detailed in Table 3 -Abatement Phase Work Area Monitoring in Attachment B (Work Area Monitoring) to this specification.

4.0 Demolition Phase Air Monitoring 4.1 Visible Emissions

Monitoring for visible emissions will be conducted as described above in Section 2.0 of this specification.

4.2 Community Air Monitoring

Community Air Monitoring will be conducted as detailed in Table 1— Community Air Monitoring in Attachment A (Community Monitoring) to this specification. Community Air Monitoring will continue through the completion of the Demolition Phase.

Initial Community Air Monitoring locations are identified on the drawing included in Attachment A (Community Monitoring) to this specification. If the environmental air monitoring loc tins need to be changed during the demolition phase due to site conditions, USEPA Region 2 office will be notifie ptly. The community air monitoring locations will not be moved until CDE and the USEPA Region 2 office accept the change.

5.0 Interpretation of Sample Data The Target Air Quality Levels and EPA Site Specific Trigger Levels for the Site are set forth in Attachment A, Table 2.

The following actions will be taken if there is an exceedance of Target Air Quality Level. If there is an exceedance of either the Target Air Quality Level or the EPA Site Specific

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NYC-WTC 000134235