Scope of Work: WTC apartment cleanup and air sampling coordination,

NYC 9/11 Public Portal Document

c. Window air conditioning units where applicable shall be run/operated at least 15 minutes prior to the start of sampling. The air conditioning units shall operate continuously throughout the sampling. HVAC systems shall be in operation during sampling. d. Based on consultation with resident, aggressive or modified aggressive air sampling will be conducted upon completion of cleaning. Before the start of sampling, forced air equipment (such as a 1 horsepower electric leaf blower) may 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. e. One 20-inch fan shall be installed per 10,000 cubic feet ofroom space and run at low speed. The fan shall operate continuously throughout sampling and shall not be turned off until sampling is completed. f. 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 md away fi-om obstructions. The sampling cassette must be placed on a tripod and not taped to existing surfaces. g- Common spaces will be sampled without the use of forced air devices (fans, leaf blowers etc). For small spaces, less than 260 linear feet and 160 square feet, 3 samples will be collected. For large spaces greater than 260 linear feet or 160 square feet and less than 25,000 square feet 5 sainples 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 fi-om obstructions. The sampling cassette mi ilaced on a tripod and not taped to existing surfaces. h. Asbestos)air samples shall be collected in accordance with the procedures specified inNIOSH Method 7400. Air sampling pumps will be operated at 10 liters per minute for eight (8) hours to achieve the maximum volume requirement of4800 liters. 1. Samples must be labeled and accompanied with completed chain of custody forms before shipping to the designated laboratory. The label must include the EPA Project Tracking Number. Samples will be packed sealed and shipped to USEPA Contract Laboratory for analysis. 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 beprovided to EPA. via the website, within 24 hours ofcompletion ofanalysis.

NYC-WTC_000140342