Chain of custody for environmental assessment, Nov 2001

NYC 9/11 Public Portal Document

5. Findings and Conclusions building 400. Twelve (12) Twelve (12) initial background air samples were collected and analyzed at des were analyzed via phase contrast microscopy (PCM) and two (2) were analyzed via Transmission teCtron Microscopy (TEM). All were below the permissible limits.

analyzed them via Based on EPA Guidelines, we collected one hundred fifty-eight (158) bulk samples and Polarized Light Microscopy (PLM) Methodology. One (1) sample collected from one apartment was found be above the regulatory limits to be slightly above the regulatory limits of 1%. Zero (0) were found to purposes. However, certified asbestos upon further analysis at a second laboratory for quality control apartment and the abatement contractors hired independently by the owner, were used to clean the specific sampling. All air samples were found to be well below the areas were cleared by ALC via TEM air permissible limits and the tenants where this cleaning took place have been notified of the clearance.

Methodology. The One hundred seventy (170) air samples were collected and analyzed via TEM results indicated that the living areas achieved the acceptance criteria below <70 structures per mm2 set by • the above regulations.

6. Limitations and Exclusions scope of work conducted and All the professional opinions presented in this report are based solely on the sources referred to in our report. The data presented by ALC in this report was collected and analyzed methods and practices at the time the report was generated. This report using generally accepted industry represents the conditions, locations, and materials that were observed at the time the fieldwork was conducted. No inferences regarding other conditions, locations, or materials, at a later or earlier time may made. ALC's liability be made based on the contents of the report. No other warranty, express or limited is services rendered hereunder, shall not and that of its contractors and subcontractors, arising from any project. This report was prepared for the sole use of exceed the total fee paid by the client to ALC for this other than our client or ALC is strictly prohibited without the our client. The use of this report by anyone expressed written consent of ALC. Portions of this report may not be used independent of the entire report.

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