Memo form re: WTC environmental compliance, undated

NYC 9/11 Public Portal Document

5. Findings and Conclusions

Twelve (12) initial background air samples were collected and analyzed at building 400. Twelve (12) ^^^es were analyzed via phase contrast microscopy (?CM) and two (2) were analyzed via Transmission »3eCtron Microscopy (TEM). All were below the permissible limits.

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

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

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

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