E-mails 2002 M. Gilsenan

NYC 9/11 Public Portal Document

Final Report 125 Cedar Street, NYC, NY

Wipe Sampling

The wipe sampling was performed consistent with generally accepted industrial hygiene practices. There were inherent limitations created by constraints of time, operational and work practice variability, variations in contaminant concentrations, and sampling and analytical accuracy. The results of the sampling represent conditions found on the dates the samples were collected.

There are no established regulatory values for these analytes on surfaces.

Wipe Sample Results Background and clearance wipe sampling was performed consistent with generally accepted industrial hygiene practices. There were inherent limitations created by operational and work practice variability, variations in contaminant concentrations, and sampling and analytical accuracy. All acceptable results of the sampling represent conditions found on the dates the samples were collected. Individual analytes specified herein were analyzed in accordance with the project specifications utilizing the following analytical procedures:

• Lead, EPA Method SW-846-6010B • PAHs, ASTM-6661-01, EPA Method SW-846-8270C • Dioxin, ASTM-6661-01, EPA Method SW-846-8290 • Mercury, EPA Method SW-846-7471A

Conclusions Based on project oversight, including results of air sampling and wipe sampling data collected, it is the professional opinion of ATC that all cleaning at 125 Cedar Street, New York, New York was conducted in accordance with the project manual as well as all applicable federal, state and local asbestos regulations. All ambient and final air clearance and wipe sample results were found to have a concentration satisfactory to achieve the acceptable criteria established by the NYCDEP and EPA standards for re­ occupancy following cleaning activities. Our professional services have been performed, our findings obtained and our recommendations prepared in accordance with customaiy principles and practices in the field of environmental science and engineering in this region. This statement is in lieu of other statements either expressed or implied. This report does not warrant against future operations or conditions, nor does it warrant against operations or conditions-present of-a” type or at a location not investigated. This report is intended for the sole use of the NYCDEP and USEPA. The scope of services performed in execution of this evaluation may not be appropriate to satisfy the

ATC Project No. 1522906.0002 Page 6

NYC-WTC_000162626