NYC-WTC_000232249

NYC 9/11 Public Portal Document

Any sample of an analyte, other than PMio, in excess of 3 times the Target Air Quality level for that analyte will be considered an exceedance and the actions described below will be taken.

Following the first week of sampling, a cumulative average will be established based initially on the first week’s results, to which will be added daily values as results are received from the laboratory.

Exceedance of an established target Air Quality Level for any analyte calculated as shown above will result in an evaluation of engineering controls and work techniques in the source area. This evaluation shall include but not be limited to the evaluation of work activities that may be causing the exceedance, smoke testing of the isolation barriers in question, and inspection and repair of any faulty isolation barriers.

8.1.2 USEPA Site Specific Trigger Levels

Any 24-hour value (work shift value on days or four hour value on non-work days in the case of asbestos) in excess of the USEPA Site Specific Trigger Level will be considered an “exceedance” and the actions described below will be taken.

Exceedance of USEPA Site Specific Trigger Levels will result in a stoppage of work associated with the exceedance until an evaluation of emission controls is performed and corrective action is in place. The USEPA Site Specific Trigger Levels are applicable to individual sample results. If any of the individual sample results exceed an USEPA Site Specific Trigger level, then notification must be made to the USEPA Region 2, NYCDEP, NYSDOL and NYSDEC. Work will be reinitiated once the USEPA Region 2 has agreed (and NYSDOL during the Abatement Phase in the case of asbestos exceedances) to the corrective action(s) proposed to prevent the potential for exceedances in future work and such corrective actions have been implemented.

L2005-149 (051205) 2 5023623.2

C ITY_D E P_WO RB Y_C AN N ATA_SU B P_000114902

NYC-WTC_000232271