WTC Cleaning Scope Authorization and Monitoring Procedures, Oct 2001

NYC 9/11 Public Portal Document

I. Before beginning aggressive air sampling, forced air equipment (such as a 1 horsepower electric leaf blower) shall be used to direct exhaust air against walls, ceilings, floors and other surfaces. When directing the exhaust, caution shall be taken to minimize disturbance and potential damage to furnishings and personal belongings. ii. For modified aggressive air sampling forced air equipment shall not be employed. iii. All other procedures are identical for aggressive a^xnod^^ aggressive air

b. One 20-inch fan shall be installed per 10,000 cubic feci of room space and run at low speed. The fan shall operate continuously throughout sampli ng and shal 1 not be turned offuntil sampling is completed. c. 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 caxseite must be placed on a tripod and not taped to existing surfaces. d. Common spaces will be sampled without the use ot iorced 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 feci 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 j^sette 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 aecordanc^^th the procedures specified inNIOSH 7400 Method for PCM and 7402 tor 'l'EM. Air sampling cassettes need to be monitored to AstOpumps; tre noi cloguing by monitoring flow rates. The minimum sample volume required is 3600 liters. '■ In (6 samples will be eollectea al 10 percent of the residences where sampling only 1 been requested, up to a maximum of 50 units, as instructed by EPA. This pliiig w ill consist of the collection of one wipe sample each for dioxin, total ah and mercury (a separate wipe sample is required for each parameter). Metals iiiid mercury wipe samples will be collected in accordance with procedures specified in HUD Appendix 13.1. Dioxin wipe samples will be r collected in accordance with the procedures specified in ASTMD 6661-01. g. The contKtof shall document all the necessary information regarding sampling activitie»mll out all field logs, data sheets, and chain-of-custody forms. The contr^^r shall use F2L for all sample and chain-of-custody documentation. Samples ipust be labeled and accompanied with completed chain-of-custody forms before shipping to the designated laboratory. The label must include the EPA Project 1 racking Number. Samples will be packed, sealed and shipped to EPA Contract Laboratory for analysis. h. 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 electronically in an EPA approved fonnal within 24 hours. Infomation on sampling activities (date, sample ID) shall be provided to EPA, via the

NYC-WTC_000140307