NYC-WTC_000231976

NYC 9/11 Public Portal Document

Section 2 - Ambient Air Monitoring Program Revision No.: 0 130 Liberty Street Deconstruction Plan Date: September 7, 2005 Lower Manhattan Development Corporation

Table 4. Phase I: Preparation Phase & Asbestos and COPC Abatement and Removal Sampling and Analysis Summary Location Parameter(s) Sample Frequency Analysis Method Off-Site Roof Top 1. Asbestos Each Day (asbestos and 1. TEM/SEM and Scaffolding 2. Silica silica are sampled during 2. XRD (4 locations on off­ work shift) site roof tops and 4 3. Metals Each Day (24 hr. Basis) 3. ICP/MS locations on 4. PCDDs/PCDFs 4. HRGC/HRMS scaffolding)* 5. PAHs 5. GC/MS 6. PCBs 6. GC/ECD 7. Mercury (total) 7. lodated Caibon Trap/CVAFS 8. PM,o Continuously “Real-Time” 8. EB AM/Gravimetric 9. PM2.5 Each Day (PMio and PM2 5 9. EB AM/Gravimetric on 24 hour basis at each location; PMio and PM2.5 reference sampler at 1 location per day on 24- hour basis witli location changed monthly)

* - If Phase I Asbestos and COPC Abatement proceeds below the scaffold monitors, then additional air monitoring for metals utilizing NIOSH Methods will be conducted at the exhaust manifolds on the lowest elevation of the work area grouping.

6.4 Phase II - Structural Deconstruction

During Phase II of the deconstruction project, air monitoring will take place at twelve (12) stations each day (Table 1 Locations 1-12). During the first three (3) days only of Phase 11, samples will be collected and analyzed for semi-volatile organics to include PCDDs/PCDFs, PAHs and PCBs. After this first three (3) day period, sampling for semivolatile organics will be reduced to a once per week frequency employing the entire station network. One day per week on a rotating basis (week #1 Monday, week #2 Tuesday, etc.) samples will be collected at eveiy station in the network. The schedule will be repeated until project completion.

The semivolatile organic samples collected employing this weekly sampling frequency will not be processed for analyses; rather they will be placed in archival storage at the laboratory. A single set of samples will be selected from each weekly sampling event to undergo analyses for PCDDs/PCDFs, PAHs and PCBs. This sample set will be selected after consideration of the PMio data corresponding to the sites and days where organic samples were collected. The station with the highest 24-hour average PMio concentration (ug/m3) recorded with a collocated organic sample each week will be selected for analyses.

A summary of sampling frequencies on a target parameter specific basis applicable to Phase II (deconstruction phase) of the deconstruction program is provided in Table 5.

6-5

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NYC-WTC_000231998