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

Appendix A

Measurement Quality Objectives for PM10 and PM2.5 — [Ref Quality Assurance Handbook for Air Pollution Measurement Systems, Volume II: Part 1, Appendix No: 3,]

Table A-1 - Measurement Quality Objectives - Parameter PM2.5 Requirement Frequency Acceptance Criteria 40 CFR Reference Filter Holding Times all filters < 30 days before sampling Part 50, App.L Pre-sampling < 10 days at 25 o C Post-sampling weighing < 30 days at 4oC

Sampling Period All data 1380-1500 minutes Part 50, App.L Sec 3.3 or value if < 1380 and exceedance of NAAQS

Reporting Units All data g/nu Part 50.3

Detection Limit 2 g/m3 Part S0, App.L Sec 3.1 Lower DL All data 200 g/m3 Part 50, App.L Sec 3.2 Upper Cone. Limit All data

Filter Visual defect check All Filters Filter Conditioning Part 50, App.L Sec 6.0 Environment All Filters 4 hours minimum Equilibration " 20-23 C Temp. Range " +/-2° C over 24 hr"" Part 50, App.L Sec 8.2 Temp. Control " 30% - 40% RH Humidity Range +1-5% RH over 24 hr. Humidity Control Lot Blanks 3 filters per lot less than 15 g " Lab QC Checks Field Filter Blank ±30 g change between Part 50, App.L Sec 8.2 Lab Filter Blank 3 per weighing session weighings Balance Check beginning, every 10th ±15 g change between samples, Sec. 7.9 weighings end <3g Duplicate Filter Weighing I per sample batch ±15 g change between weighings

Calibration/Verifcation Flow Rate (FR) Calibration If multi-point failure f 2% of transfer standard f Part 50, App.L, Sec 9.2 FR multi-point verification 1/yr 2% of transfer standard f Part 50, App.L, Sec 9.2.5 One point FR verification 1/4 weeks 4% of transfer standard 80 External Leak Check every 5 sampling events mL/min Part 50, App.L, Sec 7.4 Internal Leak Check every 5 sampling events 80 mL/min Part 50, App.L, Sec 7.4 Temperature Calibration If multi-point failure f 2% of standard Part 50, App.L, Sec 9.3 Temp multi-point verification on installation, then I/yr f 2 of standard Part 50, App.L, Sec 9.3 One- point temp Verification 1/4 weeks f 4E of standard Part 50, App.L, Sec 9.3 Pressure Calibration on installation, then 1/yr 1/4 ±10 mm Hg Part 50, App.L, Sec 9.3 Pressure Verification weeks ±10 mm Hg Part 50, App.L, Sec 9.3 Clock/timer Verification 1/ 4 weeks 1 min/mo Part 50, App.L, Sec 7.4

Accuracy FRM performance evaluation 1 ±10% Part 58, App A, Sec 3.5 Flow Rate Audit 1/2wk (automated) f 4% of audit standard

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NYC-WTC 000134264