Scope of Work: Pre-sampling inspection and aggressive air sampling protocols,

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 ihall operate continuously throughout the sampling. d. Upon completion of the cleaning, either aggressive aggressive air sampling procedures will be conducted ' verify » Lof the clean-up criteria. Aggressive or modified aggressi Rr samp led for Scope A clean-ups, based on consultation with esident. In aggressi\ ir monitoring sampling situations, before the start of samj ng, a 1 horsepower ek ic leaf blower will be used to direct exhaust air against w Ils, ceilings, floors am ther surfaces. When directing the exhaust, caution shall to minimize disturbance and potential damage to furnishings and person The procedure described below for modified aggressive sampling echniques 11 also be employed e. In modified aggressive sampling, one 20 meh fan si list J bed per 10,000 cubic feet ofroom space and run at low speed, t shall op* ! continuously throughout sampling and shall not be turned off untj is c« feted. £ For studio apartments 3 s; pis shal 'or 1-bedroom apartments and above 5 samples shall be c( seted. , pling it shall be placed in living areas and away from obstrucAi^. The Si ipling C£ !tte must be placed on a tripod and not taped to existing surlaces. g- Common spaces -wa be sami ;d withoj it the use of forced air devices (fans, leaf blowers etc). 1-orsmall spaces 3K 60 square feet, 3 samples will be collected. 11'l large spaces grea terthan If feet and less than 25,000 square feet 5 samples will be colic*.led. ! spaces greater than 25,000 square feet, 1 sample will be collected tor each 5.1 square feet. Sampling equipment shall be placed away from ..bsiruciions Thesar ng cassette must be placed on a tripod directed downward at a 45 degree ancle an i taped to existing surfaces. h. Air siimple.s shall be colTected in accordance with the procedures specified in NIOSH 7400 Method for Pf 'M and 7402 for TEM. Air sampling cassettes need to be monitored to ensure pumps are not clogging by monitoring flow rates. The minimum sampling volume required is 3600 liters. 1. 24-hour lurn-around-time shall be specified for the analysis of all post-cleaning air samples for Scope B cleanups. The contractor shall document all the necessary information regarding sampling acti \ i t ies, fill out all field logs, data sheets, and chain-of-custody forms. The contractor Ihall use F2L for all sample and chain-of-custody documentation. 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 for analysis to EMSL laboratories at: 307 W. 38* St, New York, New York 212-290-0051. k. All information must be maintained using the secure EPA website (url, user name and

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