DEP memo on EPA scope of work roles and indemnification,

NYC 9/11 Public Portal Document

iii. Room and window air conditioners shall not be operated during aggressive air sampling. iv. Leaf blowers shall not be employed for modified aggressive air sampling. V. All other procedures are identical for aggressive and modified aggressive air sampling, unless otherwise noted. b. At least one 20-inch fan shall be placed in the center of each room sampled. One fan per 10,000 cubic feet of room space shall be used. The fans shall be ogirated on slow speed and pointed toward the ceiling. The fans shall run for at least 15 minutes prior to the start of sampling. The fans shall operate qpntinuou:^ sUghout sampling and shall not be turned off until sampling is completed. ft;;:. W c. For studio apartments 3 air samples shall be collected. J im apartm^s and above, 5 air samples shall be collected Sampling equipment si Ibeplacd^in living areas and away from obstructions. The sampling cassette mus SSipldSSdona tripod, not taped to existing surface and should be directed downw^ degree 4e. d. Common spaces will be sampled withoi^h^ >rced air devices (fans, leaf blowers etc). For small spaces, less thaH^O sqiS ^gamples will be collected. For large spaces greater than 160 feet and/O than 25,000 square feet 5 samples will be collected. For spa<^f^« igr than 2^1 0 square feet, 1 sample will be collected for each 5,000 implingequ 3rnent shall be placed away fi-om obstructions. The sagging id on a tripod, not taped to existing surfaces and directed downward alB'i|||^^ree angle and e. Air samples will be collected in agi^brdance with the procedures specified in NIOSH 7400 Method for PUM' and .w2 for TOT- Air sampling cassettes need to be monitored to ensd l^'that cassettes arejl^ clogging by monitoring flow rates. The minimum sa^ ^lev< liume required is 2600 liters. All clearance air samples and copies iof necessary lentation hand delivered daily to EMSL Laboratories at: Bi W. 38* ^ York, New York 212-290-0051. ----: f. ^ple^ BBdJlected at 10 percent of the residences where sampling only equested, ui maximum of 50 residences, as instructed by EPA. This consisW the collection of 3 wipe samples each for dioxin, total metals anain^ Slote; a'leparate wipe sample is required for each parameter at each location^ i^^and mercury wipe samples will be collected in accordance with procedur scified in HUD Appendix 13.1. Dioxin wipe samples wiU 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 courj^for next day delivery to Paradigm Analytical Laboratories at: 2627 Northchase Parkway SE, Wilmington NC 28405 24-hour turn-around time shall be specified for the analysis of all samples collected using the aggressive air sampling method. Standard turn-around time will be used for all other 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

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NYC-WTC_000139837