EPA air monitoring chain of custody, Jan 2003

NYC 9/11 Public Portal Document

Environmental Protection Agency Pt. 763, Subpt. E, App. A

TABLE 1---NUMBER OF 200 MESH EM GRID OPENINGS (0.0057 mm2) NEED TO BE ANALYZED TO MAINTAIN SENSITIVITY OF 0.005 STRUCTURES/CC BASED ON VOLUME AND EFFECTIVE FILTER AREA

Eflective Filter Area Eflective Filter Area 385 sq mm 855sQnim Volume (liters) # of arid ooeniixtt 560 24 1.250 24 600 23 1,300 23 700 19 1,400 21 BOO 17 1,600 19 900 IS 1,800 17 1,000 14 2,000 15 1,100 12 2,200 14 I 1,200 11 2,400 13 I 1,300 10 2,600 12 Recommended 1,400 10 2,800 11 I Volume 1,500 9 3,000 10 I Range 1,600 8 3,200 9 Recommended I 1,700 8 3,400 9 Volume I 1,800 8 3,600 8 Range 1,900 7 3,800 8 I 2,000 7 4,000 8 I 2,100 6 4,200 7 2,200 6 4,400 7 2,300 6 4,600 7 2,400 6 4,800 6 2,500 5 5,000 6 2,600 5 5.200 6 2,700 5 5,400 6 2,800 5 5,600 5 2,900 5 5,800 5 3,000 5 6,000 5 3,100 4 6,200 5 3,200 4 6,400 5 3,300 6,600 5 3,400 4 6,800 3.500 4 7,000 4 3,600 4 7,200 4 3.700 4 7,400 3.800 4 7,600

Note minlirum volumes required: ^mm .560 liters 37 mm : 1250 liters

rater (Samoter of 25 mm - eHectiwe area of 385 sq mm Finer diameter ot 37 mm • eflective area of 855 sq mm

20. Ensure that the sampler is turned up­ 22. Ensure that the samples are stored In a right before interrupting the pump flow. secure and representative location. 21. Check that all samples are clearly la­ 23. Do not change containers if portions of beled and that all pertinent information has these filters are taken for other purposes. been enclosed before transfer of the samples 24. A summary of Sample Data Quality Ob­ to the laboratory. jectives is shown in the following Table 11:

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NYC-WTC_000149399