EPA Special Investigative Audit Report, WTC Site, Nov 2001

NYC 9/11 Public Portal Document

Congeners in water samples were also found, also with no locations or detect status. No PCB Congener data was available for bulk dust or air samples.

PCBs-Totals in dust wipe samples were reported for four (4) samples at three (3) locations, including Manahattan Community College (two (2) samples on Sept 28), PS 234-Chambers & Greenwich St (Sept 29), and Stuyvesant High School (Sept 28). In all four of these samples, PCBs-Totals were not detected at 0 ng/100 cm^ or <5 ng/100 cm\

To date, PCBs-Totals in air samples were reported for twelve (12) Lower Manhattan locations on nine (9) sampling dates. Results have been recorded in the database for samples taken up to October 26*. Detected values were reported in six (6) of the twelve (12) sites, as listed in Table 13 and illustrated in Figure 8. PCBs-Totals in air were not detected at Location E - Liberty & South End Ave, Location F-Vesey & West St, Location P - Albany & South End Ave, Location R - EPA TAGA Bus, and Location S - Rector Pl & South End Ave.

The WTC - Building 5 SW and Location A - Barclay & West Broadway sites had the highest PCBs- Totals in air results. The highest reported value was 153 ng/m’ on October 2”'^ at the WTC Building 5 SW site. For these two (2) sites, the correlation coefficient is low at 0.0351, indicating different patterns of change. Comparison of the results from the Location B - Church & Dey St and WTC - Building 5 SW sites through October 15* reveals a correlation coefficient of 0.8690.

The linear fit lines in Figure 9 indicates a steady decrease in Total PCBs at the WTC Building 5 SW, Location B, and Location A sites. At all of the sites, except WTC-Building 5 SW, the most recent results from October 15*, 18*, and 26* are all zero (0) or undetected.

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