NYC-WTC_000233682

NYC 9/11 Public Portal Document

RESPONSE GUIDELINES

should be inserted into a plastic whirlpack bag (provided) and sealed prior to sample storage. 7. Wipe the outside of the sealed containers with paper towel. 8. Attach custody seal to the sample container. 9. Place the sealed container into a rigid cooler and pack with frozen ice packs (preferred) or sealable freezer bags filled with ice. 10. Tag each sample and record all necessary information on “Sample Documentation” and “Chain of Custody” forms. 11. After all samples have been collected, preservative blanks and temperature blanks should be prepared and tagged. A preseiwative blank should be prepared for each preservative used during the sampling event. The preservative blank can be prepared by adding the appropriate amount of preservative to the preservative blank containers, and tagging the sample for the appropriate analysis (i.e., HNO3 preservative blank should be analyzed for metals). Additionally, a temperature blank container should be placed in each cooler containing samples.

3.4.3 Sample Holding 1. When samples are not in the possession of designated personnel, they should be secured (e.g., locked in a secure area) and only accessible by designated personnel. In the field, samples may need to be locked in a vehicle. 2. Samples should be chilled, but protected from freezing. 3. Samples should be held at the drinking water utility lab until shipped to a lab for analysis or until it is determined that they are not needed. 4. Samples that are held longer than the approved holding times for contaminant analysis may no longer be useful.

3.4.4 Sample Transport

1. Sample integrity and chain of custody must be maintained. All factors that might compromise sample integrity (e.g., storage containers, excessive transit time, temperature, pressure, physical disturbance, etc.) should be considered and appropriate measures taken to avoid compromising samples. 2. Sample packaging must be in compliance with shipping regulations. 3. Samples may be screened by law enforcement and/or ICs prior to sample transport to the laboratory. 4. Samples will be transported to the appropriate laboratory in coordination with law enforcement using appropriate air and ground assets.

35 Interim Final - August 2004

CITY_21MC100_004992374

NYC-WTC_000233717