NYC-WTC_000231976

NYC 9/11 Public Portal Document

Section 2 - Ambient Air Monitoring Program Revision No.: 0 130 Liberty Street Deconstruction Plan Date: September 7, 2005 Lower Manhattan Development Corporation

8.0 ACTION LEVELS AND MITIGATION MEASURES A two tiered system will be in place during the entire term of the deconstruction project. This system includes use of both Target Air Quality Levels and USEPA Site Specific Trigger Levels for each of the target parameters identified previously in Section 4. A summary listing of these Action Levels provided on a parameter specific basis is shown in Table 6.

Table 6. Target Air Quality Levels and USEPA Site Trigger Levels USEPA Site Specific Analyte Target Air Quality Levels^ Trigger Levels^ Metals Antimony 5 ug/m " 14 ug/m’ Barium 5 ug/m ’ 5 ug/m’ Beryllium_____ 0.02 ug/m’ 0.2 ug/m’ Cadmium 0.04 ug/m’ 2 ug/m’ Chromium’ 0.6 ug/m^ 0.6 ug/m’ Copper_______ 10 ug/m^ 100 ug/m’ Lead 1.5 ug/m^ 5 ug/m’ Manganese 0.5 ug/m^ 0.5 ug/m’ Mercury (Total) 0.3 ug/m^ 3 ug/m’ Nickel 0.2 ug/m’ 28 ug/m’ Zinc 16 ug/m’ 160 ug/m’ Particles and Dust Asbestos 0.0009 f/cc (PCME fibers) 70 S/mm’ (TEM AHERA sliuctuies) Particulate PMio (24 hour average) 150 ug/m _____ 150 ug/m’_____ Particulate PNE s (24 hour average) 40 ug/m^ _____ 65 ug/m’_____ Respirable Silica (crystalline) 10 ug/m 10 ug/m Organics (semi-volatiles) Dioxins/Furans (2,3,7,8 - TCDD equivalent) 0.00025 ii;-’/iii 0.025 ng/m^ PCB (total Aroclors ) 0.12 ug/m" 12 ug/m^ PAH (benzo-a-pyrene equivalent) 0.034 ug/m 3.4 ug/nr cumulative average after the first week of sampling, except for PM- s and PMio- 24-hour value. ^USEPA site-specific trigger level for hexavalent chromium used.

8.1 Action Levels

The following actions will be taken if there is an exceedance of any Target Air Quality Level. If there is an exceedance of both the Target Air Quality Level and USEPA Site Specific Trigger Level, actions associated with the USEPA Site Specific Trigger Level will govern.

8-1

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