DOH/DEP asbestos fact sheet draft, 105 Duane Street

NYC 9/11 Public Portal Document 12/11/2001 17:07 FAX 212 353 8306 ATC

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Ma eria1s in Schools document (4). Record, for each AHERA 17. Sample Storage nrcture identified, the length and width measurements. 17.1 The washed-out sample cassettes can be discarded 16.3 Record NSD (No Structures Detected) when no after use. structures are detected in the grid opening. I7.2 Sample grids and unused filter sections (7.18) must 16.4 Identify structures classified as chrysotile identified be stored for a minimum of one year. by either electron diffraction or X-ray analysis (73) and recorded on a count sheet. Verify at least one out of every ten 18. Reporting chrysotile structures by X-ray analysis. 18.1 Report the following information for each dust 16.5 Structures classified as amphiboles by X-ray analysis sample analyzed: and electron diffraction are recorded on the count sheet. For 18.1.1 Concentration in suuetures/cm2. more information on identification, see Yamate, et al, (7) or 18.1.2 The analytical sensitivity. Chatfield and Dillon (8). 18.1.3 Types of asbestos present. 16.6 Record i typical electron diffraction pattern for each 18.1.4 Number of asbestos structures count~f. type of asbestos observed for each group of samples (or a 18.1.5 Effective filtration area. minimum of every five samples) analyzed. Record the 18.1.6 Average size of the TEM grid openings that were micrograph number on the count sheet Record at least one counted. X-ray spectrum for each type of asbestos observed per 18.1.7 Number of grid openings examined. sample. Attach the print-outs to the back of the count sheet 18.1.8 Sanple dilution used. If the X-ray spectrum is stored, record the file and disk 18.1.9 Area of the surface sampled. number on the count sheet 18.1.10 Listing of size data for each structure counted. 16.7 Counting Rules: 18.1.11 A copy of the TEM count sheet or a complete 16.7.1 At a screen magnification of between 15 000 and listing of the raw data. An example of a typical count sheet Is 20 OOOX evaluate the grids for the most concentrated sample shown In Appendix X1. loading; reject the sample if it is estimated to contain more 18.2 Determine the amount of asbestos in any accepted than 50 asbestos structures per grid opening. Proceed to the sample using the following formula: next lower concentrated sample until a set of grids are EFA x 100 mL x # STR obtained that have lees than 30 asbestos structures per Arid = asbestos structures/e& (I) Go x GOA x V x SPL - n& 16.8 Analytical SenritiviI) —An analytical sensitivity of wbexe: approximately 1000 asbestos structures per square centl- #STR = number of asbestos structures counted, • metre (calculated for the detection of a single asbestos EFA — effective filter area of the final sampling filter, mnta, structure) has been designed for this analysis. This sensitivity GO — number of grid openings counted, can be achieved by increasing the amount of liquid filtered, GOA - average grid opening area, mmz, increasing the number of grid openings analyzed, or de- SPL - surface area sampled, cm2, and creasing the size of the final filter. Occasionally, due to high V = volume of sample filtered in step 10.4.9, repre- particle loadings or high asbestos conocntration, this analyt- senting the actual volume taken from the original ical sensitivity cannot be practically achieved and stopping 100 mL suspension, mL. rules apply. 19. Quality Control/Quality Assurance 16.9 Limit of Detection—The limit of detection for this 19.1 In general, the laboratory's quality control checks are method is defined as, at a minimum, the counting of four used to verify that a system is performing according to asbestos structures during the TEM analysis. If less than four specifications hiding accuracy and consistency. In an asbestos structures are counted during the analysis then the analytical laboratory, spiked or known quantitative samples analytical result which will be reported will be less than the art normally used. However, due to the difficulties in limit of detection and a "less titan" sign (<) will appear preparing known quantitative asbestos samples. routine before the number. All data shall be provided in the labo- quality control testing focuses on reanalysis of samples ratory report. (duplicate recounts). 16.10 Stopping Rules: 19.1.1 Reanalyze samples at a rate of Vie of the aampie 16.10-1 The analysis is stopped upon the completion of sets (one out of every ten samples analyzed not inducting the grid square that achieves an analytical sensitivity of less laboratory blanks). The reanalysis shall consist of a second than 1000 asbestos structures per square centimetre'_ sample preparation obtained from the final filter. 16.102 If an analytical sensitivity of 1000 asbestos struc- 19.2 In addition, quality assurance programs must follow tures per square centimetre cannot be achieved after ana- the criteria shown in the USEPA A.tbtuos-Cdrtainbta Mate- lyzing ten grid openings then stop on grid opening No. 10 or rialr in Sdsools document (4) and in the MST/NKLAP the grid opening which contains the 100th asbestos structu e, Program Handbook for Airborne Asbestos Analysts docu- whichever comes Best. A minimum of four grid squares shall ment (6). These documents describe sample custody, sample be analyzed for each sample. preparation, blank cbeda for comamination, calibration, 16.10.2.1 If the analysis is stopped because of the 100th sample analysis, analyst qualifications, and technical facili- structure orb, the entire grid square containing the 100th ties. —' structure must be counted. 16.11 After analysis, remove the grids from the TEM, and 2e.. Callbr anion replace them in the appropriate grid storage holder. 20.1 Perform calibrations of the instrumentation on a

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