Final cleaning and monitoring scopes of work for WTC indoor

NYC 9/11 Public Portal Document

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. d. Common spaces will be sampled without the use offorced air devices (fans, leafblowers etc). For small 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. For spaces greater than25,000 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, not taped to existing surfaces and directed downward at a 45 degree angle. e. 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 sample volume required is 3600 liters. These air samples and copies of necessary documentation shall be hand delivered daily to EMSL Laboratories at: 307 W. 38* St, New York, New York 212-290-0051. f. Wipe samples will be collected at 10 percent ofthe residences where sampling only has been requested, up to a maximum of 13 residences, as instructed by EPA. This sampling will consist ofthe collection of3 wipe samples each for dioxin, total metals and mercury (Note: a separate wipe sample is required for each parameter at each location). Metals and mercury wipe samples will be collected in accordance with procedures specified in HUD Appendix 13.1. Dioxin wipe samples will be collected in accordance with the procedures specified in ASTMD 6661-01. Wipe samples and copies of necessary documentation will be packed, sealed and shipped daily by courier for next day delivery to Paradigm Analytical Laboratories at: 2627 Northchase Parkway SE, Wilmington NC 28405. g- 24-hour tum-around time shall be specified for the analysis ofall samples collected using the aggressive air sampling method. Standard tum-around time shall be specified for analysis of modified aggressive air samples and wipe samples. h. The Monitoring Contractor will document all the necessary information regarding sampling activities, fill out all field logs, data sheets, and chain-of-custody forms. The Monitoring Contractor will 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. 1. All information must be maintained using the secure EPA website (url, user name and password to be provided by EPA). Information on sampling activities (date, sample ID) shall be provided to EPA, via the website, within 24 hours ofcompletion ofsampling. All data shall be maintained as confidential.

Deliverables

8

NYC-WTC_000138782