Chain of Custody Form Instructions for WTC Building Sampling

NYC 9/11 Public Portal Document

Table 12 Highest Amount of Materials Measured in the Indoor Settled Dust of Each Building Building Number Quartz Gypsum Asbestos SVF (%)“■* (%Y‘ Comparison Locations 31-34 2J Non-Detect Non-Detect 1 31 J 30 J Non-Detect 20 2 23J 14 J Non-Detect 27 3 Not Sampled Not Sampled Not Sampled Not Sampled 4 14 J 9J <1 15 5 11 J 9J <1 20 6 27 J 20 J <1 15 7 21 J 15 J Non-Detect 5 8 28 J 17J Non-Detect Non-Detect 9 25 J 16J <1 7 10 3J 0.8J 1.5 20 11 2J 2J 1.5 Non-Detect 12 4J Non-Detect 5 13 0.05 J 1J Non-Detect 10 14 0.03 J 2J Non-Detect 5 15 0.4 J 1J <1 5 16 Non-Detect 0.9 J Non-Detect Non-Detect 17 2J 2J Non-Detect 2 18 0.9 J 1J Non-Detect 35 19 2J Non-Detect Non-Detect 20 0.9 J 1J Non-Detect Non-Detect 21 0.9 J 2J Non-Detect Non-Detect 22 14 J 2J Non-Detect 3 23 2J 1J Non-Detect Non-Detect 24 0.03 J Non-Detect <1 10 25 Non-Detect 2J Non-Detect 5 26 0.7 J 2J Non-Detect 5 27 0.04 J 1J <1 10 28 Non-Detect 1J Non-Detect 10 29 1J 2J Non-Detect Non-Detect 30 1J 4J Non-Detect Non-Detect a. Minerals were measured by XRD, Quartz is considered representative of the relative presence of portlandite and calcite (aU are associated with concrete). b. Asbestos value represents the highest of the PLM and TEM result for each location. c. SVF is synthetic vitreous fiber and was measured by PLM. d Results shown ate estimated values, indicated by “J.” e. % = weight of mineral per weight of dust f. % = roughly area of fibers per area of dust.

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NYC-WTC_000149647