Wipe samples for metals report, PS 89M, Jan 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan January 18, 2002 Wipe Samples for Metals Page 2 P. S. 89 (Manhattan) ATC Project No. 15-19125-0297

The 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 metal 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 metals on indoor surfaces. The New York State Department of Environmental Conservation (NYSDEC) has clean-up objectives for metals in soil but not for interior surfaces (see Attachment 2). There are no Occupational Safety and Health Administration (OSHA) standards that are applicable to this circumstance.

Wipe Sample Results

Metals were detected in all three samples, however Cd, Co, Mo and Ni were not detected. Al, Cu, Fe, Mg, Mg and Zn were found in all samples. Chromium was detected in one sample. All of the metals detected, except Cr, were also found in the blank. Cu was not detected in the samples at a level greater than in the blank. Metal concentrations are shown in the following table. TABLE CONCENTRATIONS OF METALS DETECTED Micrograms per square foot (ug/ft')' SAM I’Ll SAMPLE S.-\.MPI.. F M-01 M-02 (Blank,’ ALUMINUM 26.6 24.2 6.25 (Al) CHROMIUM 0.788 BRI/ 0.229 BRL (Cr) COPPER 1.91 1.22 2.06 2.46 (Cu) IRON 100 59.5 83.2 5.89 (Fe) MAGNESIUM 68.6 64.7 83.3 30.1 (Mg) MANGANESE 1.37 1.02 3.75 BRL (Mn) ZINC 11.6 7.76 8.26 3.22 (Zn) 1 ft’ is approximately 100 cml Blank results are in ug/sample Below Reporting Limit

Cr and Mn were the only metals found in the samples but not in the blank. After the blank concentration is subtracted, the Cu level drops to below the detection limit. The metals found in the highest concentrations were Fe and Mg.

CONFIDENTIAL, SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008 CITY_21 MC100_014660255

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