NYC-WTC_000232959

NYC 9/11 Public Portal Document

Building Method or Number Sample Type Location Quartz Cristobalite Tridymite Calcite Portlandite Gypsum Mica Halite Settled surface dust 33 (%) Outdoor NS NS NS NS NS NS NS NS Settled surface dust 33 (%) Residence 1 NS NS NS NS NS NS NS NS Settled surface dust 33 (%) Residence 2 1 J ND ND ND 0.08 J 2 J ND ND

34 Air (pg/m’) PM100 ND ND ASN ND ND ND ND ND

34 Air (pg/m’) PM10 ND ND ASN ND ND ND ND ND

34 Air (pg/m^) PM4 ND ND ASN ND ND ND ND ND

34 Air (pg/m^) PM2.5 ND ND ASN ND ND ND ND ND Settled surface dust 34 (%) Common area ND ND ND ND ND ND ND ND Settled surface dust 34 (%) Outdoor NS NS NS NS NS NS NS NS Settled surface dust 34 m Residence 1 NS NS NS NS NS NS NS NS Settled surface dust 34 (%) Residence 2 ND ND ND ND ND 3 J ND ND

ASN: Analytical sensitivity not available. Mineral was not detected at any measured location using the associated method, analytical sensitivity is not known. Detect: Mineral was detected above the analytical sensitivity in at least one of the measured locations of the building using the associated method. J: Estimated value. Due to inconsistencies during sample collection/analysis, the result is only an estimate of the actual value. The actual value could be higher or lower than the value shown. ND: Not detected. Mineral was not detected at any measured location using the associated method. NS: Not sampled. The associated method was not used at any of the measured locations in the building. R: Result was rejected. Due to inconsistencies during sample collection/analysis, the result values for the sample were rejected. pg/m^: microgram per cubic meter of air.

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CITY_21MC100_011171551

NYC-WTC_000233082