b. Samples must be labeled and accompanied with completed chain of custody forms
before shipping to the designated laboratory. The label must include the EPA Project
Tracking Number. Samples will be packed sealed and shipped to USEPA Contract
Laboratory for analysis. Metals samples will be analyzed using EPA Method SW-
846 6010B. Mercury samples will be analyzed using EPA Method SW-846 7471.
21. Post Clean-up Air Sampling Procedures
a. Sampling shall not begin until a visual inspection confirms the absence of visible
dust and debris. Post cleaning air sampling shall be completed within 24-hours of
the completion of cleaning activities.
b. All surfaces must be completely dry prior to the start of sampling.
c. Window air conditioning units where applicable shall be run/operated at least 15
minutes prior to the start of sampling. The air conditioning units shall operate
continuously throughout the sampling.
d. Based on consultation with resident, aggressive or modified aggressive air sampling
will be conducted upon completion of cleaning. Before the start of sampling, forced
air equipment (such as a 1 horsepower electric leaf blower) may be used to direct
exhaust air against walls, ceilings, floors and other surfaces, '^en directing the
exhaust, caution shall be taken to minimize disturbance and potential damage to
furnishings and personal belongings.
e. One 20-inch fan shall be installed per 10,000 cubic feet of room space and run at low
speed. The fan shall operate continuously throughout sampling and shall not be
turned off until sampling is completed.
f. For studio apartments 3 samples shall be collected. For 1-bedroom apartments and
above 5 samples shall be collected. Sampling equipment shall be placed in living
areas and away from obstructions. The sampling cassette must be placed on a tripod
and not taped to existing surfaces.
g- Common spaces will be sampled without the use of forced air devices (fans, leaf
blowers etc). For small spaces, less than 260 linear feet and 160 square feet, 3
samples will be collected. For large spaces greater than 260 linear feet or 160 square
feet and less than 25,000 square feet 5 samples will be collected. For spaces greater
than 25,1 square feet, 1 sample will be collected for each 5,' square feet.
Sampling equipment shall be placed away from obstructions. The sampling cassette
must be placed on a tripod and not taped to existing surfaces.
h. Asbestos air samples shall be collected in accordance with the procedures specified
in NIOSH Method 7400. Air sampling pumps will be operated at 10 liters per minute
for eight (8) hours to achieve the maximum volume requirement of4800 liters.
i. Samples must be labeled and accompanied with completed chain of custody forms
before shipping to the designated laboratory. The label must include the EPA Project
Tracking Number. Samples will be packed, sealed and shipped to USEPA Contract
Laboratory for analysis.
6
NYC-WTC_000161179
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000161179Source: NYC Law Department, mirrored locally
Details project scope for scheduling, coordinating, and monitoring dust and debris cleanup with air sampling from apartments affected by World Trade Center collapse.
The NYC Health Commissioner writes to the EPA Administrator thanking them for environmental sampling efforts and expressing concerns about communications.