EPA review letter, 133-135 Greenwich Street

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

Metals sampling and analysis will be performed following NIOSH 7300 "Elements by ICP," except that ICP-MS will be utilized. A hot blocklacid digestion will be utilized. Metals to be analyzed by ICP-MS and reported are: Antimony, Barium, Beryllium, Cadmium, Chromium, Copper, Lead, Manganese, Mercury (particulate), Nickel and Zinc.

Total Dust sampling and analyses will be conducted by NIOSH 0500.

Mercury:

In addition to metals monitoring for mercury particulate using air filters, real-time monitoring will be performed. The readings will be entered into the PDA program for inclusion with the daily download of sample collection data.

Real-time monitoring will be performed daily throughout the project. Mercury monitoring will be performed utilizing a Lumex RA 915+ direct read instrument.

The Lumex RA915+ will be utilized to obtain detection levels below established Site air contaminant criteria. At a minimum, mercury readings will be taken twice a shift at the fixed air monitoring locations. At the discretion of the Environmental Consultant and as daily Site conditions may dictate, additional mercury readings may be taken.

Organic Compounds (Dioxin/PCBs/PAHs):

Organic compounds samples will be collected at specified points along the project schedule as follows:

1. On the first day of the Background Phase, one sample of each organic compound at each community monitoring location will be collected (three total samples per location). The samples from the location with the highest particulate readings will be analyzed. 2. Organic samples will be collected at each community monitoring location once a week on a different day of the work week during the Abatement Phase and Demolition Phase, until all days of the work week are used and then the same schedule will be repeated until project completion. Samples from the location with the highest particulate readings for that day will be submitted for analysis. This will result in the processing of the samples that have the best likelihood of representing the "worst case." A total of three samples per week, one Dioxin, one PCB, one PAH will be analyzed. 3. Samples for organic compound analyses will be analyzed within fourteen days under normal laboratory analysis turn-around time

11

NYC-WTC 000134240