Technical specifications for air quality monitoring work at two Manhattan buildings.
NYC-WTC_000163360–000163368Folder label: “E-mails M. Gilsenan”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
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 10,000 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.
Five samples will be collected per unit area. Sampling equipment shall be placed in living areas and away fi-om 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 biowere etc). Five asbestos samples will be collected in each apartment per floor. Sampling equipment shall be placed away from obstructions. The sampling cassette must be placed on a tripod directed downward at a 45° 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 liters 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.
All clearance air samples and completed chain of custody forms must be submitted to the laboratory immediately after sampling is completed.
A turn-around time of 24 hours is required for the analysis of asbestos post-clearance air samples.
Reporting ofLaboratory Sample Results
Asbestos Air Fiber Samples All samples collected will be analyzed by the NIOSH 7400 Method, Counting rule “A.” The remaining portion of the filter will be analyzed by AHERA Method which counts fibers >0.5 pm in length. The laboratory must also record fibers >5u m in length to determine the PCMe value. The PCMe Value is determined by counting all fibers >5pm with 3:1 aspect ratio by TEM.
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NYC-WTC_000163367
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NYC-WTC_000163372
Request to send the air monitoring scope document to legal counsel and the sender due to computer access issues.
14 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.984
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000162815
Request for review of monitoring contractor specifications for air sampling, including sampling methodologies, limits of detection, and clearance criteria, with reference to prior…
13 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.984
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000162838
Correspondence regarding Schedule A forms and a draft scope of work for cleaning and air monitoring contracts at the site.
13 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.983
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.
15 shared non-person entities · 1 shared topics · similarity 0.986
machine-extracted · confidence unavailable · Check page ↗15 shared non-person entities · 1 shared topics · similarity 0.985
machine-extracted · confidence unavailable · Check page ↗14 shared non-person entities · 1 shared topics · similarity 0.985
machine-extracted · confidence unavailable · Check page ↗13 shared non-person entities · 1 shared topics · similarity 0.984
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.
13 shared non-person entities · 1 shared topics · similarity 0.984
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000156000
Contractor work scope for air monitoring and environmental surveillance at 125 Cedar building.
15 shared non-person entities · 1 shared topics · similarity 0.984
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machine-extracted · confidence unavailable · Check page ↗13 shared non-person entities · 1 shared topics · similarity 0.984
machine-extracted · confidence unavailable · Check page ↗14 shared non-person entities · 1 shared topics · similarity 0.984
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NYC-WTC_000096827
Document identified only by its archive reference number with no visible text content in the excerpt.
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Letter from DOHMH transmitting results of a July 2002 mold inspection at 125 Liberty Street.
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NYC-WTC_000139360
DEP official asks if new mold regulations require inclusion in the cleaning scope for 125 Cedar Street.
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