Revised scopes of work for cleaning and monitoring, July 2002

NYC 9/11 Public Portal Document

debris. Post cleaning air sampling shall be performed upon successM^ visual inspeetfon and completed.- within 24 hours. A success&l visual inspection shaU be an mspeeti.on that verifies the absence of dust and debris. ; ■ b. All surfaces must be completely dry prior to (he start of sampling. ■ c. Window air eonditiotting units where-applicable shall benai/operated at least I S minutes prior to the start ofsampling. Th^ units shall operate continuously' throughout the sampling. d. Based on consultation with-resident,-aggressive or modified aggressive air sampling wi 11 be conducted upon completion ofcleaning. In aggressive air monitoring sampling situations, before the start of sampling, a 1 horsepower electric leaf blower will 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. The procedure descri bed below for modified aggressix'e sampling techniques will also be employed e. In modi tied aggressive sampling, one 2()-indi fan shall be installed per 10,000 cubic feet of room space and run al low speed. The Ian shall operate continuously throughout sampling and shall not be turned off until sampling is completed. £ For studio apartments 3 samples sha!! be col leeted. For 1 -bedroom apartments and above 5 samplesshall be collected. Sampling equipment shalI be placed in 1 iving areas and away from obstructions. The sampling cassette must be placed on a tripod and not taped to existing surfaces, V ■■ c g- Common spaces will be sampled without the use of forced air devices (fans, leaf blowers etc). For small spaces. Ic.ss than 160 square feel. 3 .samples will be collected. For large spaces greater than 160 square foel and less than 25,000 square feet S samptes 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 cassette must be placed on a tripoddirected downward at a 45 degree angle and not taped to existing surfaces. h. Air samples shall be collected in accordance with the procedures specified in NIOSIl 7400 Method for PCM and 7402 for TEM. Air sampling cassettes need to be monitored to ensure pumps are not clogging by monitoring flowrates, friemiramum sampling volume required is 36(fo liters. . ■ Ihe contractor shall document all the necessary mfonnationregarding saoipling activities, fill out all field logs, data sheets, and chain-of-custody forms. Ilie contractor shall use F'2L for dl sample and chain-of-cuslody documentation. Saraplesmust belabdediandaccompaniM with completed chain ofcustodyfonnsbeforeshippingtofliedesignated laborafoty.Tlie label must include the EPA Project Tracking Number. Satepies will be packed, sealed and tor analysis to EMSL laboratories at: 307 W. 38* St., New York, New York 212-290- 0051. , , ■ 3 j- All information must be maintained using the secure EPA website(url, user name and password to beprovided by EPA). Oates for momtoriflg and/or cleaning shallbe provided to EPA aaci DEP electronically in an EPA approved format withia 24hours. Infennation on sampling activities (date, sample ID) will be provided to EPA, via &e website, within 24

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