NYC-WTC_000188121

NYC 9/11 Public Portal Document lu/ui/ui jnun xu;uy paa ziz ova avo4 Decutei UKa ureiuer Utl uu«j

The anticipated monitoring outline is shown in Table 1. The requirements may change as new hazards are identified. The Contractor will be notified in writing of any requested changes and will be expected to prepare a revised monitoring strategy within 2 days after receipt of request Requested Site Monitoring

Direct Reading Exposure Monitoring The following are some of the instruments that could be required by the Contractor for exposure monitoring at the WTC site. • Photo-ionization detector, (PID) • Flame-ionization detector (FID) • Combustible gas indicator (CGI) • Specific gas monitors (e.g. oxygen, carbon monoxide, hydrogen sulfide) • Real-time aerosol monitor (RAM) • Radiation detection instruments • Colorimetric indicating tubes (e.g. Draeger tubes) • Mercury vapor analyzer • Infrared analyzers (MIRAN) • Noise dosimeter • Sound level meter (SLM)

When required to support a specific task (based on Job Hazard Analyses) direct reading monitoring results (date/time, calibration information, results, and activities monitored) shall be recorded on an ^ropriate data sheet. Monitoring results shall be recorded initially and periodically throughout the monitoring period (e.g., every 15 minutes, when results are above background levels, when site operations or locations change, or when unexpected site conditions arise). Results of routine direct reading monitoring should be summarized and documented on the Direct Reading Monitoring Report (Figure 1 or equivalent). These reports shall be submitted to the DDC as part of the daily safety report.

Integrated Personal Air Monitoring Integrated personal air monitoring refers to the continuous collection of a sample over a period of time for subsequent analysis, usually by a laboratory. This monitoring typically involves the use of portable sampling pumps and an appropriate collection media such as filters, or adsorption tubes. Integrated monitoring can also be performed using organic vapor monitors and other passive sampling devices.

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NYC-WTC_000188124