Contract for asbestos project monitoring and air sampling near WTC,

NYC 9/11 Public Portal Document

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b) All surfaces must be completely dry prior to the start of sampling.

c) Sampling equipment shall be placed at representative locations within the work area and away from obstructions. The sampling cassette must be placed on a tripod and not taped to existing surfaces.

d) 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.

e) Forced air equipment (e.g. leaf blowers) may be used only after written authorization by the occupant or his/her authorized representative. The project monitor shall advise the occupant or his/her authorized representative on the advantages and disadvantages regarding the use of the equipment and obtain the individual’s signature authorizing use. The authorization shall provide a summary of the advantages and disadvantages and shall be provided by the USEPA.

Before the start of sampling, forced air equipment (such as a 1 horsepower leaf blower) may be used to direct exhaust air against walls, ceilings, floor, ledges and other surfaces. When directing the exhaust, caution shall be taken to minimize disturbance and potential damage to furnishings and personal belongings.

One 20-inch fan shall be installed per 10,000 cubic feet of room 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. Technicians shall collect a volume of 3000 liters per sample using a flow rate of 10 liters per minute.

g) Samples must be labeled and accompanied with completed chain of custody forms before shipping to the designated laboratory.

5. All information must be maintained on a data based software program that is acceptable to the USEPA. Information in the database shall be updated every 24 hours. The information shall at a minimum include information on scheduling, posting of notices, dates of air monitoring and inspections, results of inspections, sampling results, completion dates, etc.

NYC-WTC_000140595