NYC-WTC_000199812

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I TABLE 16. SUMMARY OF RESULTS OF TRANSMISSION ELECTRON MICROSCOPY ANALYSES ■D o c o o FOR AIRBORNE ASBESTOS CT

CD o' CD "0 OO 250 SOUTH END AVENUE, NEW YORK CITY o O) 03

O PCM-EQUIVALENT FIBERS AND BUNDLES o o (Length >5 micrometers; Width >0.25 micrometer; Aspect Ratio >3:1) c 3 CD 3 Fiber Concentration, Fibers/mL Fibers Volume Number Sample Fiber per of Air of Description Type 95% Confidence Analytical Square Sampled Fibers Mean * Interval Sensitivity Millimeter Liters Counted

Sample 250SEA-10D-A1 Chrysotile 0.063 0.037 - 0.099 0.00348 178 1092 18 9/18/01 1092 0 Amphibole ND 0 - 0.011 0.00348 0 Apartment lOD Total 0.063 0.037 - 0.099 0.00348 178 1092 18 Den Sample 250SEA-10D-A2 Chrysotile 0,060 0.034 - 0.098 0.00376 157 1001 16 oo 9/18/01 0 - 0.012 0.00376 0 1001 0 Amphibole ND Apartment lOD Total 0.060 0.034 - 0.098 0.00376 157 1001 16 Den Sample 250SEA-10D-A3 944 Chrysotile 0.048 0.028 - 0.076 0.00264 117 18 9/18/01 0.00264 944 0 Amphibole ND 0 - 0.008 0 Apartment lOD Total 0.048 0.028 - 0.076 0.00264 117 944 18 Living Room Sample 250SEA-10D-A4 Chrysotile 0.075 0.050 - 0.11 0.00251 193 987 30 9/18/01 987 Amphibole ND 0 - 0.008 0.00251 0 0 Apartment lOD Total 0.075 0.050 - 0.11 0.00251 193 987 30 Q Living Room H K Sample 250SEA-10D-A5 I Chrysotile 0.073 0.043 - 0.12 0.00407 174 915 18 ro 9/18/01 I—i Amphibole NSS 0 - 0.030 0.00407 19.3 915 2 S Apartment lOD o Total 0.081 0.043 - 0.13 0.00407 193 915 20 o I—i Bedroom o I o - No mean value is reported when fewer than 4 countable fibers were detected in the portion of sample examined o Ob ND - No Countable Fibers Detected co NSS - Not Statistically Significant (1 to 3 countable fibers detected) o