Carpet mastic asbestos analysis results letter, December 2002

NYC 9/11 Public Portal Document

EMSLNYCNOBCHTFIELDSOP 200.0 Revison 1 T . February, 2002

2.0 SAMPLE PREPARATION

Bulk Samples (Chatfield & Non -Friable Organically Bound - NOB) • 1. Place the samples into the order noted on the COO. • 2. Set up a clean, pre-weighed crucible for each sample. 3. Set up a Clean pre-weighed petri dish with a filter for each sample. Label each petri dish with with last 4 digits of the order number, the client sample number and the weight of the filter. 4. Separate floor tile from mastic if possible without cross 5. contamination. Always separate layers if possible unless client specifically 6. instructs otherwise. Remove 100-500mg: of sample and weigh in the pre-weighed 7. crucible. Place each crucible in the labeled 'muffin tin', using the crucible map to identify the sample numbers, as shown here:

Samples are placed in the tin beginning at the top left and proceding across and down (as in reading a book).

Fill out the drucible map form with the identifing letter (etched on the tin) and the sample numbers in the order placed in the tin.

8. Place into a pre-heated muffle furnace at 4800 C for.4 hours. 9. Remove from the furnace and allow cooling to room temperature. 10. . Re-weigh the sample and crucible and log the weight on the NOB preparation form: 11... Grind the residue in the crucible with 0.5m1 of distilled particle free water and 2- 5m1s of HCL. • 12. Filter the sample through the pre-weighed 0.4µm filter and rinse the crucible, filtering the rinse water until no sample remains in the crucible. • The samples are identified while in the filtering funnel by placing the relevant petri dish (the one belonging to that sample). directly in front of the applicable funnel. Controlled Copy Page 2 of 7

NYC-WTC 000092680