E-mails 2003 M. Gilsenan

NYC 9/11 Public Portal Document

DW» It is anticipated that the work will be completed within three (3) weeks. Post clean up sampling shall begin within 4 hours of successful visual inspection and shall be completed within 2 days.

Sampling and Analytical Procedures for Lead. PAHs, Dioxin. Fibrous Glass, and Silica

1. Sampling for lead, PAHs, and dioxin shall be performed by the wipe sampling technician. A completed chain of custody must accompany all samples. A unique sample number shall be assigned to each sample. A complete written description and/or diagram shall clearly identify each sampling location.

2. Post cleaning air samples for fibrous glass and silica shall be collected concurrently with the asbestos clearance air sampling procedures specified herein. Five samples for fibrous glass and one sample for silica shall be collected in each apartment.

3. Wipe samples shall be collected before and after cleaning for lead, dioxin, and PAHs.

Prior to the cleaning activities, three wipe samples shall be collected for each of these parameters in each apartment. The sampling locations shall be a wall, a bare floor, and a counter or tabletop.

After cleaning activities, three wipe samples shall be collected for each of these parameters in each apartment. The sampling locations shall be a wall, a bare floor, and a counter or tabletop; preferably at the same location as the pre-cleaning samples.

4. The required sampling and analytical procedures are specified in Table 1.

5. The detection limit for PAHs shall be no greater than 1 pg/m^.

6. Samples containing concentrations of specific congeneric analytes (PCDDs and PCDFs) considered within the scope of the dioxin sampling method that are greater than ten times the upper MCLs must be analyzed by a protocol designed for such concentration levels, e.g.. Method 8280. Analytical results shall be reported using a 2,3,7,8-TCDD toxicity equivalence (TEQ). The TEQs shall be reported four ways. A TEQ which sets non-detects to zero (i.e., TEQ (ND=0), a TEQ which sets non-detects at 1/2 the detection limit (i.e., TEQ (ND=l/2), a TEQ Estimated Maximum Potential Concentration with non-detects set to zero (i.e., TEQ EMPC (ND=0), and a TEQ Estimated Maximum Potential Concentration with non-detects set to 1/2 the detection limit (i.e., TEQ EMPC (ND=l/2). Please see attachment 2 for the format and data to report for dioxin wipe samples.

j ^ab/e 1: Samp/ing and Analytical Methods Parameter Description Sampling Analytical Method Maximum Methodology Turnaround Time Lead Wipe samples HUD Appendix 13.1 EPA Method SW-846-6010B I day PAHs Wipe sample? ASTMD6661-01 ASTM-6661-01 14 day5~ EPA SW-846-8270C Dioxin Wipe samples ASTM 6661-01 ASTM 6661-01 14 days EPA Method SW-846-8290 Fibrous Air samples NIOSH 7400 NIOSH 7400, 3 days Glass Counting Method “B” 3 of 6

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