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NYC Law Department letter regarding EPA draft report excerpts, July

Machine-extracted title · confidence 100%

Correspondence from NYC Corporation Counsel providing comments on excerpts of a draft EPA evaluation report regarding the WTC response.

NYC-WTC_000146129–000146748

Folder label: “EPA OIG LAW

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NYC 9/11 Public Portal Document

. Parameter

Asbestos TEM Monitoring Methodology

EPA MIERA TEM Action Level

70 structures/mm2 Basis of Action Level

EPA School asbestos Importance

High techniques clearence standard

Asbestos PCM high

PM10 FRMs EPANAAQS high

PM2.s TEOM continuous EPANAAQS high monitors•

Inorganic Gases ERT Protocols medium

voes ERT TAGA Protocols low

Criteria Gases FR Methods EPANAAQS low

Dioxins, PCBs low . PAHs low

Metals low

toxic silicates medium

7 ') Definitions: Asbestos Portable asbestos samplers, tw~~t~grated samples per day PM10 Particulate matter smaller than ~.;·in diameter PM2.5 Particulate matter smaller than 2.5 microns in diameter AIIBRA TEOMS. - contiuous measurement, reported every 2 hours NAAQS National Ambient Air Quality Standard TEM Transmission Electron Microscope PCM FRM Federal Reference Monitor - 24-hour integrated sample VOCs Volatile Organic Compounds TAGA Trace Atmospheric Gas Analyzer - grab samples PAH toxic silicates Metals acid gases Criteria gases CO, NOx, S02, 0 3, - continuous instruments, reported hourly * TEOMS may not be available (due to supply) or usable (due to size and power consumption). Contingency monitoring methodologies, in likely order of priority, are Data RAMS and Nephelometers, which measure the same parameters in slightly different ways.

NYC-WTC_000146542

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NYC-WTC_000146542Source: NYC Law Department, mirrored locally

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