NYC-WTC_000219925

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Source: All Sources >/.../> CFR © TOC: Code of Federal Regulations >/.../> SUBPART E - ASBESTOS-CONTAINING MATERIALS IN SCHOOLS > APPENDIX A TO SUBPART E - INTERIM TRANSMISSION ELECTRON MICROSCOPY ANALYTICAL METHODS ~ MANDATORY AND NONMANDATORY - AND MANDATORY SECTION TO DETERMINE COMPLETION OF RESPONSE ACTIONS 40 CFR PART 763 APPENDIX A TO SUBPART E

LEXIS PUBLISHING'S CODE OF FEDERAL REGULATIONS Copyright (c) 2002, LEXIS Publishing

*** THIS SECTION IS CURRENT THROUGH THE JANUARY 24, 2002 ISSUE OF *** *** THE FEDERAL REGISTER ***

TITLE 40 - PROTECTION OF ENVIRONMENT CHAPTER I - ENVIRONMENTAL PROTECTION AGENCY SUBCHAPTER R - TOXIC SUBSTANCES CONTROL ACT PART 763 - ASBESTOS SUBPART E - ASBESTOS-CONTAINING MATERIALS IN SCHOOLS

40 CFR PART 763 APPENDIX A TO SUBPART E

APPENDIX A TO SUBPART E - INTERIM TRANSMISSION ELECTRON MICROSCOPY ANALYTICAL METHODS - MANDATORY AND NONMANDATORY - AND MANDATORY SECTION TO DETERMINE COMPLETION OF RESPONSE ACTIONS

I. Introduction

The following appendix contains three units. The first unit is the mandatory transmission electron microscopy (TEM) method which all laboratories must follow; it is the minimum requirement for analysis of air samples for asbestos by TEM. The mandatory method contains the essential elements of the TEM method. The second unit contains the complete non­ mandatory method. The non-mandatory method supplements the mandatory method by including additional steps to improve the analysis. EPA recommends that the non-mandatory method be employed for analyzing air filters; however, the laboratory may choose to employ the mandatory method. The non-mandatory method contains the same minimum requirements as are outlined in the mandatory method. Hence, laboratories may choose either of the two methods for analyzing air samples by TEM.

The final unit of this Appendix A to Subpart E defines the steps which must be taken to determine completion of response actions. This unit is mandatory.

II. Mandatory Transmission Electron Microscopy Method

A. Definitions of Terms

1. Analytical sensitivity — Airborne asbestos concentration represented by each fiber counted under the electron microscope. It is determined by the air volume collected and the proportion of the filter examined. This method requires that the analytical sensitivity be no greater than 0.005 structures <3>.

2. Asbestiform — A specific type of mineral fibrosity in which the fibers and fibrils possess high tensile strength and flexibility.

3. Aspect ratio — A ratio of the length to the width of a particle. Minimum aspect ratio as defined by this method is equal to or greater than 5:1.

http;//lexis/research/retrieve?_m=el35f2ca3d266867e53d261df3205722&_fmtstr=FULL&d 02/04/2002

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NYC-WTC_000219925