Interagency WTC committee coordination memo, April 2002

NYC 9/11 Public Portal Document

a mold man, so could use take a crack at putting together a tiered benchmark paradigm for our green friends consistent with the approach that’s detailed below.)

There was some discussion about linking the COC list to geographic zones (i.e., proximity to Ground Zero).

NYCHOH will collect and review NYCDEP indoor sampling data to further delineate the COC list.

A strawman benchmark table (see below) will be presented demonstrating the tiered approach for indoor assessment.

Proposed Approach for Establishing Health-Based Benchmark Values

I I Tier I Screening Value Action I I I I E-04 {1 yr) or HQ = 10 aggressive cleaning I I (professional?) - if I I readings persist take 1 1 additional action to reduce I I exposure 1 4---------------------------- I 1 ---- +----------------------- I II I background or E-04 (30 ( maintain recommended (i.e., I I I yr)/HQ =1 to E-04 (1 yr)/HQ | diligent wet/HEPA) cleaning I I 10 I methods - consider I I 1 1 additional monitoring 1 I ------ 4--------------------------- 4.-------------------- I III I < background or E-04 (30 I no further action I I I yr)/HQ = 1 I I + +

* Example (dioxin in air)

I + I Tier | Screening Value I Action I I I I .162 ng/m3 (E-04 x 1 yr) | aggressive cleaning I 1 (professional?) - if I I I readings persist take I I additional action to reduce 3

NYC-WTC_000160204