Asbestos and lead survey report cover, 130 Cedar Street, July

NYC 9/11 Public Portal Document

Asbestos and Lead Paint Inspection Report for 130 Cedar Street, New York, NY 10006

0 2.2 ASBESTOS BULK SAMPLE ANALYSIS AND METHODOLOGY:

The bulk samples of the suspect asbestos-containing materials collected were analyzed using Polarized Light Microscopy (PLM) in accordance with EPA 600/M4-82-021 by JLC Environmental Consultants, Inc. (JLC). The analysis involves microscopically observing the suspect asbestos containing materials with a low power stereo-scopic microscope to determine the homogeneity of the material. Forceps samples are then immersed in a refractive index solution, placed on a microscope slide, teased apart, covered with a cover slip, and observed with a polarized light microscope.

JLC's Laboratory is accredited by the New York State Department of Health Environmental Laboratory Approval Program (NYS DOH ELAP #11029) and by the National Institute of Standards and Technology under their National Voluntary Laboratory Accreditation Program (NVLAP #101953). Polarized light microscopy with dispersion staining (PLM-DS) is the most efficient method for detecting asbestos In bulk samples. It is this method that the JLC lab uses during bulk building material analyses.

A chain of custody Is kept for each sample to ensure proper handling and delivery to the JLC lab prior to analysis. To avoid any possible contamination, all sample and slide preparation is carried out in a ventilated, HEPA-filter hood with continuous airflow. Sample analysis is performed using PLM-DS in accordance with the USEPA, "Method for the Determination of Asbestos in Bulk Building Materials," EPA 600 R-93 116, July 1993, and NYDOH-ELAP certification manual, "Polarized Light Microscope Methods for Identifying and Quantitating Asbestos in Bulk Samples," ELAP 198.1, October 1993.

All samples are subject to preliminary visual stereomicroscopic examination. Observation of homogeneity, fiber identification, and semi-quantitation of constituents can be made at this point. Samples lacking uniformity of composition and/or distribution of component materials then undergo homogenization. Some nonfriable organically bound (NOB) samples such as floor tiles and roofing materials may require additional steps to dislodge problem matrices (i.e. ashing, extractions, and TEM).

Identification of suspect fibers is made by PLM analysis of subsamples. A microscope equipped with dual polarizing filters enables us to observe specific optical characteristics of each sample. Positive Identification of asbestos requires determination of the following optical properties: morphology, color and pleochrolsm, refractive indices, birefringence, extinction characteristics, and signs of elongation.

Asbestos quantitation is performed by point-counting procedure, a standard technique in petrography for determining the relative areas occupied by separate minerals in rock. An ocular reticle superimposes a point or points over the microscope's field of view. The number of points positioned directly above each kind of particle or fiber is recorded. A total of 400 points must be counted over at least eight different representative subsamples to complete analysis.

Prepared for Masterworks Development Corp. By JLC Environmental Consultants, Inc. Project No. 04-3271 Page 7

NYC-WTC 000125212