Final cleaning and monitoring scopes of work for WTC indoor

NYC 9/11 Public Portal Document

vi. Leaf blowers shaUnot be employed for modified aggressive air sampling. vii. All other procedures are identical for aggressive and modified aggressive air sampling, unless otherwise noted. d. At least one 20-inch fan shall be placed in the center ofeach room sampled. One fan per 10,000 cubic feet ofroom space shall be used. The fans shall be operated on slow speed and pointed toward the ceiling. The fans shall run for at least 15 minutes prior to the start ofsampling. The fans shall operate continuously throughout sampling and shall not be turned off until sampling is completed. e. For studio apartments 3 air samples shall be collected. For 1 -bedroom apartments and above, 5 air samples shall be collected. Sampling equipment shall be placed in living areas and away from obstructions. The sampling cassette must be placed on a tripod, not taped to existing surface and should be directed downward at a 45 degree angle. f. Common spaces will be sampled without the use offorced air devices (fans, leafblowers etc). Forsmall spaces, less than 160 square feet, 3 samples will be collected. For large spaces greater than 160 square feet and less than 25,000 square feet 5 samples will be collected. Forspaces 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 tripod directed downward at a 45 degree angle and not taped to existing surfaces. g- Air samples will be collected and analyzed in accordance with the procedures specified in NIOSH 7400 Method followed by AHERA TEM. Air sampling cassettes need to be monitored to ensure that cassettes are not clogging by monitoring flow rates. The minimum sampling volumerequired is 3600 liters. All clearance air samples and copies ofnecessaiy documentation shall be hand delivered daily to EMSL Laboratories at: 307 W. 38* St., New York, New York 212-290-0051. h. 24-hour tum-around time shall be specified for the analysis ofall post-cleaning air samples for Scope B cleanups and for all samples collected using the aggressive air sampling method. Standard tum-around time shall be specified the analysis ofair samples collected for Scope A cleanups using the modified aggressive air sampling method. 1. The Monitoring Contractor shall document all die necessary information regarding sampling activities, fill out all field logs, data sheets, and chain-of-custody forms. The Monitoring Contractor shall 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 TrackingNumber. 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 be provided to EPA, via the website, within 24 hours of completion of evaluation. AU data shall be maintained as confidential.

Deliverables

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NYC-WTC_000138786