NYC-WTC_000205550

NYC 9/11 Public Portal Document

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 diagram shall clearly identify each sampling location.

2. 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. [WHAT ABOUT THE TOP APARTMENT, WHICH OCCUPIES 2 FLOORS? WHAT ABOUT THE OFFICE SPACES AND RESTAURANTS?]

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. [WHAT IS THE PURPOSE OF TAKING A SAMPLE FROM A WALL? DUST TENDS TO SETTLES ON HORIZONTAL SURFACES, NOT VERTICAL ONES]

3. 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.

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.

3 of? 2/7/03

CITY DEP WORBY CANNATA SUBP 000031028

NYC-WTC_000205552