OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
.Before beginning aggressive air sampling, a 1 horsepower electric leaf blower shall be used to direct exhaust air against walls, ceilings, floors and other surfaces. This shall continue for at least five minutes per 1; square feet of floor. When directing the exhaust, caution shall be taken to minimize disturbance and potential damage to furnishings and personal belongings.
Personal protective equipment including disposable clothing, gloves, and respirators shall be worn during aggressive air sampling activities.
HVAC systems shall be shut down or isolated locally during aggressive air sampling.
Room and window air conditioners shall not be operated during aggressive air sampling.
Leaf blowers shall not be employed for modified aggressive air sampling.
All other procedures are identical for aggressive and modified aggressive air sampling, unless otherwise noted.
At least one 20-inch fan shall be placed in the center of each room sampled. One fan per 10,' cubic feet of room space shall be used. The fans shall be operated on slow speed and pointed toward the ceiling. The fans shall run for at least 15 minutes prior to the start of sampling. The fans shall operate continuously throughout sampling and shall not be turned off until sampling is completed.
For studio apartments 3 air samples shall be collected. For 1-bedroom apartments and above, 5 air 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, not taped to existing surface and should be directed downward at a 45 degree angle.
Common spaces will be sampled without the use of forced air devices (fans, leaf blowers etc). For small spaces, less than 160 square feet, 3 samples will be collected. For large spaces greater than 160 square feet and less than 25,000 square feet 5 samples will be collected. For spaces greater than 25,000 square feet, 1 sample will be collected for each 5,000 square feet. Sampling equipment shall be placed away from obstructions. The sampling cassette must be placed on a tripod directed downward at a 45 degree angle and not taped to existing surfaces.
Air samples will be collected in accordance with the procedures specified in NIOSH 7400 Method. The flow rate for collection of air samples shall be at least 10 liters per minute and no more than 15 litem per minute. Air sampling cassettes need to be monitored to ensure that the filters do not develop dark spots that would indicate clogging. The minimum sampling volume required is 3600 liters. If clogging develops then the cassette must be changed.
4 of 5
NYC-WTC_000163308
OCR can misread numbers and units. Confirm readings against the page image before using them.
Ranked by indexed similarity. Reasons describe shared subjects and filing context; check the source records.
NYC-WTC_000163360
Technical specifications for air quality monitoring work at two Manhattan buildings.
12 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.980
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000153557
Document outlining scope of work for asbestos abatement contractor and environmental monitoring at 125 Cedar Street.
12 shared non-person entities · 1 shared topics · similarity 0.983
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.981
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.981
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.981
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000156050
Document tracking the chain of custody for environmental samples collected at 114 Liberty Street on August 22, 2002.
12 shared non-person entities · 1 shared topics · similarity 0.981
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000139389
DEP forwards inspection report for 125 Cedar Street along with NYC guidelines on fungal remediation.
11 shared non-person entities · 1 shared topics · similarity 0.981
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.979
machine-extracted · confidence unavailable · Check page ↗11 shared non-person entities · 1 shared topics · similarity 0.979
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000156019
Document tracking the chain of custody for environmental samples collected at 125 Cedar Street on August 21, 2002.
12 shared non-person entities · 1 shared topics · similarity 0.979
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000155841
A single scanned page from the 125 Cedar administrative file containing illegible text or data fields.
12 shared non-person entities · 1 shared topics · similarity 0.978
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000156000
Contractor work scope for air monitoring and environmental surveillance at 125 Cedar building.
12 shared non-person entities · 1 shared topics · similarity 0.978
machine-extracted · confidence unavailable · Check page ↗Similar subjects in other documents. Similarity does not establish the same event, measurement or conclusion.
Page similarity is temporarily unavailable or this page has no indexed vector.
Machine-extracted building matches; verify each source. Buildings, never households.
Readers open these alongside this record — through an Ask answer, the same folder, or indexed similarity. Not a claim they are about the same event.
Report documenting an asbestos inspection conducted at 114 Liberty Street by ETS Construction.
Cited alongside this record in an Ask answer
NYC-WTC_000102579
A fax cover sheet from ETS Contracting Inc. dated March 17, 2003, transmitting documents related to the WTC site.
Cited alongside this record in an Ask answer
NYC-WTC_000102588
A fax cover sheet from ETS Contracting Inc. dated March 4, 2003, transmitting documents related to the WTC site.
Cited alongside this record in an Ask answer
NYC-WTC_000152966
Office of the Comptroller grants written approval for an emergency procurement to clean the interior of 114 Liberty Street.
Cited alongside this record in an Ask answer
NYC-WTC_000153530
DEP memo outlines proposed interior cleaning procedures for 114 Liberty Street following WTC collapse damage.
Cited alongside this record in an Ask answer