NYC 9/11 Public Portal Document
Six were below the detection limit.
Post P‘ Cleaning Samples (Tsst 4D) - Two air samples were collected, both with results
below the 0.051 pg/m^ detection limit as well as the primary clearance criterion of 1.0
Post Cleaning Samples (Test 4E) - Three wipe samples were collected. The glass jars
containing two of the samples were broken at the laboratory; however, the laboratory was
able to analyze these samples. The samples were below the primary clearance criterion of
25 P-g/ft^. The third sample exceeded the primary clearance criterion at a concentration of
38.2 pg/ft^. Re-cleaning and testing at this location was not performed since this sample
was collected on a window sill which was later painted by the property owner.
Alpha-Quartz
Before Cleaning Samples - Pre-cleaning air samples were not collected.
Post P‘ Cleaning Samples (Test 4A) - There were two air samples collected after the first
cleaning. Both air samples were below the detection limit.
Post P‘ Cleaning Samples (Test 4B) - Two air samples were collected. Both samples
were below the detection limit.
Post Cleaning Samples (T2st 4C) - Two air samples were collected. Both were below
the detection limit.
Calcite
Before Cleaning Samples - Pre-ciezinng air samples were not collected.
Post P‘ Cleaning Samples (Test 4A} - Two air samples were collected. Both air samples
were below the detection limit.
Post P‘ Cleaning Samples (Test 4B) - Two air samples were collected. Both samples
were below the detection limit.
Post Cleaning Samples (Test 4C) - Two air samples were collected. Both were below
the detection limit.
Cristobalite
Before Cleaning Samples - Pre-cleaning air samples were not collected.
Post f‘ Cleaning Samples (Test 4A) - Two air samples were collected after the first
cleaning. Both air samples were below the detection limit.
Post P‘ Cleaning Samples (Test 4B) - Two air samples were collected. Both samples
were below the detection limit.
Post P‘ Cleaning Samples (Test 4C) - Two air samples were collected. Both were below
100
NYC-WTC_000145798
OCR can misread numbers and units. Confirm readings against the page image before using them.