NYC-WTC_000232249

NYC 9/11 Public Portal Document

Table 3. Phase I -Abatement Phase Sampling and Analysis Summary Location Parameter(s) Sample Frequency Analysis Method 7. PMIO Continuously “Real-Time” 7. EBAM 8. Mercury (vapor/gas) Each Day 8. lodatedCarbon Trap/CVAF Roof Top 1. Asbestos Each Day 1. TEM (3 Locations) 2. Silica Each Day (24 hr. Basis) 2. XRD 3. Metals 3. XRF 4. PCDDs/PCDFs 4. TO 9 A (HRGCZHRMS) 5. PAHs 5. TO 13 A (GC/MS) 6. PCBs 6. TO 4 A (GC/MS)

7. PMtO Continuously “Real-Time” 7. EBAM 8. Mercury (vapor/gas) Each Day 8. lodated Carbon Trap/CVAF

6.3 Phase II - Structural Deconstruction

During Phase II of the deconstruction project, air monitoring will take place at all seven (7) stations each day. During the first three (3) days only of Phase II, samples will be collected for semi-volatile organics to include PCDDs/PCDFs, PAHs and PCBs. After this first three (3) day period, samples for these organic parameters will be reduced to a single location per week frequency employing the seven (7) station network. More specifically, samples will not be collected using all seven (7) stations each day; rather a single set of samples will be collected each day at a single station in the network. This sequence will be repeated each day using a different station each day until all of the seven (7) stations have been used. In this manner a set of samples will be collected at each location every seven (7) days.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 sample set representing seven (7) days to undergo analyses for PCDDs/PCDFs, PAHs and PCBs. This sample set will be selected after consideration of the PM 10 data corresponding to the sites and days where organic samples were collected. The station with the highest 24-hour average PM 10 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 the demolition phase of the deconstruction program is provided in Table 4.

Table 4, Phase II - Structural Deconstruction Phase Sampling and Analysis Summary Location Parameter(s) Sample Frequency Analysis Method Site Area Mercury (vapor/gas) Each Day Lumex, portable mercury analyzer Site Area Visible dust emissions Each Dav Visual observation

L2005-149 (051205) 2 5023623.2

C ITY_D E P_WO RB Y_C AN N ATA_SU B P_000114897

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