NYC-WTC_000230933

NYC 9/11 Public Portal Document 4-... . .'iT.t-IZllZiM.

USEPA; United States Environmental Protection Agency. /■

jM^mogeneons Work Area: Portion of the Work Area that contains one type of ACM and/or where one of abatement is used. F^^Ptiase Contrast Microscopy: “PCM” shall mean the measurement protocol far the assessment for the fiber content of air. For PCM analysis, the clearance air monitoring shall be considered satisfactory when every sample is less than or equal to 0,01 f/cc or die background concentrations, whichever is greater.

Polarized Light Microscopy; "PLM”3haiI mean the measurement protocol for the assessment for the asbestos content of bulk materials. For PLM analysis, the New York City and EPA Regulatory limit is 1,0%.

Tranamission Electron Microscopy; ‘TEM”shall mean the measurement protocol for the assessment for the asbestos fiber content of air. For TEM analysis, the clearance air monitoring shall be considered satisfactory when the requirements stated in 40 CFR Part 763, Subpart E, Appendix A, Section IV are met. For the purposes of our testing the regulatory limit is 70 asbestos structures per mm2.

4.0 Scope of Work 4.1 Bulk Sampling Procedures

ALC’s licensed tscimicians warked under the guidance provided by the EPA guidelines for asbestos “AsfegstPJ in Buildings: Simplify Sampling Scheme for Friable Surfacing Maierials.” niis sampling procedure uses random sampling to ensure that the samples are representative of the sampling area. ALC’s inspectors:

1. Identified all friable surfacing materials and grouped them into homogenous sampling areas by floor 2. Prepared diagrams of each sampling area 3, Determine the number of samples to collect (9 samples per homogenous areas arc recommended) Determine sampling locations 4, Collect samples 5. Fill out chain of custody 6. Send samples to a qualified laboratory

Due to the insufficient amount of dust and debris in the apartment units arid public areas of the building, we were unable to collect the optimum number of samples suggested in the above referenced guidelines.

With the guidance of the above referenced document and NYCDEP we went to each floor and assessed each apartment on each floor for visible dust and debris. Upon completion of the initial assessment and bulk sample collection, ALC determined that there were no elevated asbestos levels present above the guidelines in any of the apartments where samples were taken.

If any dust and/or debris was found in the apartment we collected a bulk sample and sent it to the laboratory for analysis.

If no sample could be taken due to insufficient material present at the time we were in the apartment, the inspector documented this on the log.

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s. 029SP CITY_21MC100_008873484

NYC-WTC_000230936