sampling will be cofidueted. Residents shall not be present in their ^apartment during
aggressive air sampling activities.
i. Before beginning aggressive air sampling, forced air equipment (such as a 1
horsepower dectric leafblower) shall be used to direct exhaust air against walks
ceilings, floors and. other surfaces. When directi.ng the exhaust, caution shall be
taken to minimize disturbance and potential damage to furnishings and personal.
belongings. * ■
ii. for modified aggressive air sampling forced airequipment shall not be employed.
iii. All other procedures are identical for aggressi\ e and modi lied aggressive air
sampling.
b. One 20-ineh 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. <
c. For studio apartments 3 samples shall be col leeted. fori -bedroom apartments and above
5 samples shall be collected. Sampl ing cquipn tent si la 1! be placed in living areas antfaway
from obstructions. The sampling cassette must be placed on a tripod and not taped to
existing surfaces, /
4. Common spaces will be sampled without the use of forced air devices (fans, leaf blowers
etc). For small spaces, less than 160 square feet. I '.ampleswill be collected. For large
spaces greater than 160 square feet and less than 25.00t) square feet 5 samples will be
collected. For spaces greater than 25,000 square feci. 1 sample will be collected for each.
5,000 square feet. Sampling equipment shall be placed away from obstnictions. The
sanipl.in.g cassette must be placed on a tripod directed downward at a 45 degree angle and
not taped to existing .surfaces.
e. Air samples shall be collected in accordance with the procedures specified in NIOSH 7400
Method for Pt’M and 7402 forTEM. Air sampling cassettes need to be monitored to
ensure pump ..in i-'-:-. ■■ .ng by monitoring flow rates. The minimumsahipie volume
required is 3600 liters.
£ Wipe samples will be collected at 10 percent of the re.sidences where sampling only ha.s
been requested, up to a maximum of 50 units, as instructed by EPA. This saWplittg will
consist of the collection of one wipe sample each for dioxin, total metals and
mercury (a separate wipe sample is required for each parameter). Metals and
mercury wipe samples wilbe collected in accordance with procedures specified in
H111) Appendix 13.1. Dioxin wipe sam pies will be coUected ia accordance with the
procedures specified in ASTMD h661-01. ,
g- The contractor shall document all the neces.sary infonnation regarding sampling activities.
fill out all field logs, data sheets, and chain-of-custody forms. The contra.ctor shall use F2L
for all saniple and chain-of-custbdy documentation. Samples must be labeled and
accompanied with completed chain-of-custody forms before shipping to the designated
laboratory. The label mustinclude the EPA. Project Tracking Number. Samples will be
packed, sealed and.^ shipped to EPA Contract Laboratory for analysis.
b. All infonnatfon must bemfoatained using the secure EPA website (url, user name and
password to be provided by EPA). Dates for monitoring aad/or cleaningshallbe provided
NYC-WTC_000163959
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000163959Source: NYC Law Department, mirrored locally
EPA transmits revised statements of work for WTC cleaning and monitoring activities incorporating modifications and additions discussed in interagency meeting.
15 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.997
Document preservation notice from City Law Department instructing personnel not to dispose of WTC-related records that are held as evidence for potential future litigation.
EPA transmits revised statements of work for WTC cleaning and monitoring activities incorporating modifications and additions discussed in interagency meeting.