Chain of Custody Form Instructions for WTC Building Sampling

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I TJ o Table 7 c o CT o __________ Summary of Mineral Components of Settled Surface Dust by Sampling Location o' co Outdoor Settled Surface Dust ofLower Manhattan TJ a> O Number of Minimum Maximum Average of Number 3- to Detected Detected Detections Above Occurrences, 14 samples (% by weight) (% by weight) (% by weight) Comparison'* O o totaf Outdoor samples were not taken from comparison areas above o c Quartz 14(100%) 11 “ 27 J 12 J NA ‘ 59th Street because no sailed surface dust was visible. 3 CD Calcite 13(93%) 0.8 J 19 J 6J NA O

Portlandite 12 (86%) 0.07 J 6J 2J NA Gypsum 11 (79%) 0.03 J 27 J 6J NA Mica 9 (64%) 0.05 J 0.3 J 0.1 J NA Halite 7 (50%) <0.03 J 0.1 J 0.05 J NA Common Area Settled Surface Dust ofCower Manhattan Common Areas of Comparison Areas Above 59th Street Number of Minimum Maximum Average of Number Number of Minimum Maximum Average of Occurrences, Detected Detected Detections Above Occurrences, Detected Detected Detected Values 26 samples (% by weight) (% by weight) (% by weight) Comparison'’ 3 samples total (% by weight) (% by weight) (% by weight) total’ Quartz 21 (81%) 0.03 J 25 J 5J 6 (23%) 2 (67%) 1J IJ NA Calcite 15 (58%) 0.02 J 10 J 3J 9(35%) 2 (67%) 0.03 J 0.4 J NA Portlandite 13 (50%) 0.04 J 4J 2J 9(35%) 1 (33%) 0.05 J 0.05 J NA Gypsum 23 (88%) 0.07 J 20 J 5J 6(23%) 2 (67%) 2J 3J NA Mica 5(19%) 0.06 J 0.6 J 0.2 J 5 (19%) 0 (0%) ND ND NA Halite 4(15%) 0.04 J 0.06 J 0.05 J 1 (4%) 1 (33%) 0.04 J 0.04 J NA Residential Units Settled Surface Dust rfLower Manhattan Jtesidential Units of Comparison Areas Above S9th Street Number of Minimum Maximum Average of Number Number of Minimum Maximum Average of Occurrences, Detected Detected Detections Above Occurrences, Detected Detected Detected Values 57 samples (% by weight) (% by weight) (% by weight) Comparison'’ 5 samples (% by weight) (% by weight) {% by weight) totaf total’ Quartz 30 (53%) 0.05 J ILL 9J 15 (26%) 2 (40%) 1 J 2J NA Calcite 20 (35%) 0.02 J 21 J 8J 13 (23%) 1 (20%) 0.9 J 0.9 J NA Portlandite 21 (37%) 0.05 J 8J 2J 17 (30%) 2 (40%) 0.08 J 0.08 J NA Gypsum 45 (79%) 0.05 J JOJ. 4J 9 (16%) 4 (80%) 2J 4J 3J Mica 5 (9%) 0.03 J 03J 0.1 J 1 (2%) I (20%) 0.08 J 0.08 J NA Halite 6(11%) 0.03 J 0.1 J 0.06 J 0 (0%) 1 (20%) 0.4 J 0.4 J NA a. Shows the number of samples where the mineral was delected and the percentage based on the number of samples obtained from this area. b. Shows the number ofresults, and the percentage of samples obtained from this area, that had estimated values greater than the maximum levels found at locations above 59lh Street. NA = not applicable. d. J = estimated.

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