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

Table A-1 - Measurement Quality Objectives - Parameter PM10(Dichotomous Sampler) Requirement Frequency Acceptance Criteria Reference Information/Action Reporting Units All data µg/m3 40 CFR, Pt 50.7

Filter Checks Visual defect check Filter All filters See reference Vol II, MS 2.10.4 Discard any defective Integrity filters Collection efficiency Purchase 99 % 40 CFR, Pt 50, Integrity Specification f 5 µg/m3 App M, S 7.2 As measure by DOP test Alkalinity < 25.0 (ASTM-2988). Reject Filter Conditioning All filters microequivalents/gram shipment. Equilibration time " 40 CFR, Pt S0, Following 2 months storage Temperature range at least 24 hours App M, S 9.3 at ambient temp and Temperature control 15 to 30° C 4 CFR, Pt 50, App relative humidity. Humidity range f 3C M, S 7.4 Repeat equilibration Humidity control 20 to 45 % relative humidity Keep thermometer in f 5% relative humidity balance room and record temperature daily.

Keep hygrometer in the balance room and record humidity daily. Equipment Sampler Purchase specification 40 CFR, Pt 53.9 Purchase Flow rate transfer specification 40 CFR, Pt 50, App M, S 7.3 standard Purchase Analytical balance specification 40 CFR, Pt 50, App M, S 7.5 Purchase Vol II, MS 2.10.4 Mass reference standards specification Vol II MS 2.10.4 Detection Limit The lower limit of the mass LDL Not applicable Not applicable 40 CFR, Pt 50, concentration is determined App M, S 3.1 by the repeatability of filter tare weights, assuming the nominal air sample volume for the sampler. Sampler Calibration 40 CFR, Pt 50, Adopt new calibration Flow control device App M, S 7.1 curve if no evidence of On installation, after <4% difference from Vol II, MS 2.10.2 damage, otherwise replace. repairs, after out-of- manufacturers spec and limits flow check actual 40 CFR, Pt 50, Elapsed time meter App M, S 7.1 Adjust or replace. On receipt and 1/6 months 115 min 40 CFR, Pt 50, Flow-rate transfer App M, S 8.2 Checked against NIST- Standard Periodically traceable primary standard. f2% over the expected range Vol II, MS 2.10.1 of ambient conditions Vol II, MS 2.10.1 Balance Calibration 1/year Vol II, MS 2.10.4 Calibrate and maintain according to the manufacturer's recommendations.

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NYC-WTC 000134266