Chain of Custody Form Instructions for WTC Building Sampling

NYC 9/11 Public Portal Document

Mineral Analyses in Air

Estimated levels of minerals in air for samples from 30 residential buildings (1-30) in lower Manhattan and 4 comparison residential buildings (31-34) above 59th Street are shown in the following table. The estimated air concentration of each mineral by size fraction is shown for each area sampled. Typically, samples were obtained from an outdoor area, an indoor common area, and two residences. In addition, co-located samples were obtained from some locations. However, due to inconsistencies during sample collection or analysis, the specific sampling location within the building is not noted. Sample Tridymite Calcite Portlandite Gypsum Mica Halite Building Particle Size Quartz Cristobalite Volume (Mfl/m’) (Mfl/m^ (Mfl/m’l) Number Fraction (Mfl/m^ (Mfl/m ’) (Mfl/m’) (L)

Summary of Comparison Areas Above SOth Street PM100 ND-3J PM10 M3-3J

PM4 ND-5J

PM2.5 M3-3J

Results for IndMdual Buildings Sampled In Lower Manhattan (Buildings 1-30) 1 PM100 882 6J

1 PM100 830 1 PM100 818 1 PM100 892 1 PM10 861 1 PM10 835 7J 1 PM10 838 14 J

1 PM10 899 8J

1 PM4 809 844 10 J 1 PM4 813 12 4

1 FM4 820 64 684 104

1 PM4 837

2 PM100 1229 2 PM100 1162 2 PM100 766 2 PM100 1240 2 PM10 1194 2 PM10 1168 2 PM10 1390 2 PM10 1216 2 PM4 757 74

2 F=M4 717 2 PM4 849

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