E-mails R. Avaltroni 2002

NYC 9/11 Public Portal Document

The following COCs are still under consideration gypsum Lime calcite portlandite

The following COCs are candidates for deletion — PCBs — PBDEs chromium — cadmium — mercury — benzene — mold

• Clearance level will be the higher of background or long-term risk-based numbers • The workgroup will provide the reasoning behind making a COC a candidate for deletion. • Background levels are needed for data analysis. • A recommendation was made to take PAHs off the COC list. However, the existing data should be reviewed before that decision can be made. • Although no longer airborne, there may be depositions of PAHs and dioxin on surfaces inside the buildings. • Objectives of the pilot clean-up will include — to determine the level of clean-up required to reduce COCs determine how COCs relate to the WTC develop criteria for settled as well as airborne dust • The workgroup will establish risk-based COC levels by the next meeting. • The workgroup will have a revised list of COC candidates for deletion by next the next meeting (CNOC - contaminants of no concern). • A list should be developed of COCs of historical concerns (COHC).

2. Background Study • Background levels are needed. • The pilot background study will be a small volume of samples • EPA will take the lead on designing the study • EPA will review the indoor air quality data they have available. EPA Region 5 has indoor air quality data on their website. EPA Region 2 will review that information as well. • A recommendation was made that environmental consultants throughout the city should be approached for their existing indoor air data. • A consistent sampling method is required.

3. The Need for Peer Review/Science Advisory Panel

NYC-WTC 000160870