Visual inspection and aggressive air sampling procedures using leaf blowers,

NYC 9/11 Public Portal Document

a. Sampling shall not begin until a visual inspection confirms the absence of visible dust and debris. Post cleaning air sampling shall be performed upon successful visual inspection and completed within 24 hours. A successful visual inspection shall be an inspection that verifies the absence of dust and debris. 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 uniLs shall operate continuously throughout the sampling. d. Based on consultation with resident, aggressix e or modi issive air sampling will be conducted upon completion of cleanin”. In ;iggres; mitoring samjiling situations, before the start of sampling, a 1 horsepower electric hcaf blower will he used to direct exhaust air against walls, j ceilings, floor^aiul olhi cr surfaces. When directing the exhaust, caution shall be tai cn to minimize disturb: Biential damage to furnishings and personal beloq s. The procedure desi ■clow for modified aggressive sampling techniques a 11 so be employed e. In modified aggressive sampling, one 20-inch fair installed per 10,000 cubic feet of room space and run at low speed. The fan sH te continuously throughout sampling and shall not be turned off until sar ipling is c f. For studio apartments 3 samples shall be co 1 -bedroom apartments and above 5 samples shall be collected. Sampling * uuipinent all be placed in living areas and away from obslructions. The sampling cal € placed on a tripod and not taped to existing surfaces. g- Common spaces will be sampled without tl le use of forced air devices (fans, leaf blowers etc). For small spaces, less than 160 iquare feet, 3 samples will be collected. For large spaces greater than 160 square id less than 25,000 square feet 5 samples 4will be coll© . I or space .'r th;in 25,000 square feet, 1 sample will be colkvled fore 5,()(i() squall Sampling equipment shall be placed away from obswuctions.- ing cassette must be placed on a tripod directed downward at o as angle .nu ot raped to existing surfaces. h. des shall be t lecicd in accordance with the procedures specified in NIOSH cthod lor P; ^Bnd 7402 for TEM. Air sampling cassettes need to be TOoniiored 1 ensure; pumps are not clogging by monitoring flow rates, the minimum ■<

sampling xl ume required is 3600 liters. i The contr^ or shall document all the necessary information regarding sampling activities, fl out all field logs, data sheets, and chain-of-custody forms. The contractor

A shall use F2I.. for all sample and chain-of-custody documentation. Samples must be labele^^H accompanied with completed chain of custody forms before shipping to the designated laboratory. The label must include the EPA Project Tracking Number. Ah Samples will be packed, sealed and for analysis to EMSL laboratories at: 307 W. 38* 'St., New York, New York 212-290-0051. J- All information must be maintained using the secure EPA website(url, user name and password to be provided by EPA). Dates for monitoring and/or cleaning shall be provided to EPA and DEP electronically in an EPA approved format within 24 hours. Information on sampling activities (date, sample ID) will be provided to EPA, via the website, within 24 hours of completion of evaluation.

NYC-WTC_000140380