NYC-WTC_000232127

NYC 9/11 Public Portal Document

Part II - Environmental Community Monitoring Plan 133-135 Greenwich & 21-23 Thames Streets Airtek Project 05-0701 - Rev 2 September 16, 2005

Attachment A

Table 2- Data Reference Levels for Community Monitoring

Analyte Target Air Quality Levels EPA Site Specific Trigger See Note 1 Levels - See Note 2 Metals______________ Antimony 5 ug/m3 14 ug/m3 Barium 5 ug/ni3 5 ug/m3 Beryllium___________ 0.02ug/m3 0.2ug/m3 Cadmium 0.04 ug/m3 2 ug/m3 Chromium - See Note 3 0.6 ug/m3 60 ug/m3 Chromium VI 0.6 ug/m3 Copper______________ 10 ug/m3 100 ug/m3 Lead 1.5 ug/m3 5 ug/m3 Manganese__________ 0.5 ug/m3 0.5 ug/m3 Mercury 0.3 ug/m3 3 ug/m3 Nickel 0.2ug/m3 28 ug/m3 Zinc 16 ug/m3 160 ug/m3 Particles and Dusts Asbestos 0.00028 f/cc (SEM PCMe 70 S/mm2 (TEM AHERA fibers) structures) Particulate PM-10 (24 hour 150 ug/m3 150 ug/m3 average) Particulate PM-2.5 (24 hour 40 ug/m3 65 ug/m3 average) Respirable Silica 10 ug/m3 10 ug/m3 (crystalline)_____________ Organics (semi-volatiles) Dioxins/Eurans (2,3,7,8 - 0.00025 ng/m3 0.025 ng/m3 TCDD equiv.) PCB (total Aroclors) 0.12 ug/m3 12 ug/m3

PAH (benzo-a-pyrene 0.034 ug/m3 3.4 ug/m3 equivalent) Note 1: A rolling average after the first week of sampling, except for PM-10 and PM-2.5. Note 2: A 24-hotir viilue. Note 3: If a chromium value is in excess of the Target Air Quality Level (0.6 ug/m3), this will result in a stoppage of work; and, that sample will be speciated for chromium VI to determine that its concentration does not exceed the USEPA Site Specific Trigger Level for chromium VI (0.6 ug/m^), and the appropriate actions pertaining to an cxcccdancc of the USEPA Site Specific Trigger Level for ckramium ZE will continue to be conducted.

12

CITY_DEP_WORBY_CANNATA_SUBP_000087257

NYC-WTC_000232138