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EPA review letter, 133-135 Greenwich Street

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US EPA Region 2 letter dated November 15, 2005, confirming completion of environmental review for abatement plans at 133-135 Greenwich Street.

NYC-WTC_000134132–000134414
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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

Precision #5 Fg/m for cone. 80 µg/m3 40 CFR, Pt 50, Both PM10 values must be Single analyzer 1/6 days App M, S 4.1 > 20 µg/m . 7% for cone. >80 µg/m Reporting 1/ 3 months 95% CI <± 15% 40 CFR, Pt 58, organization App A, S 5.3 EPA-600/4-83-023 Accuracy Transfer standards different Single analyzer Quarterly None 40 CFR, Pt 58, then those used in Annual accuracy (all sites yearly) 95% CI #± 20% App A calibration. Recalibrate EPA-600/4-83-023 quarterly (all sites before Vol II, App 15, S 6 any additional sampling. Invalidate data to last acceptable flow yearly) check if difference> 10%. QC Checks Field calibration flow 1/month Percentage difference # ±7 40 CFR, Pt 50, check from sampler's indicated App M, S 8.2 Trouble shoot and flow rate or # ± 10 % from Vol II. MS 2.10.3 recalibrate sampler. "Standard" filter at beginning of design condition flow rate weighing weighing day f 20g of original weight Vol II, S 2.10.4 Trouble shoot and reweigh. Reweighing filters 5 exposed and 5 unexposed/day f 20 g of original weight Trouble shoot and reweigh. I/month ± 2 g at 10 mg Vol II, S 2.10.4 Trouble shoot and reweigh.

Balance zero and every fifth filter f 4 g at zero Calibration check ± 2 gat 10 mg Vol II, S 2.10.4

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NYC-WTC 000134267

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NYC-WTC_000134267Source: NYC Law Department, mirrored locally

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