NYC-WTC_000205426

NYC 9/11 Public Portal Document

WTC IH OPERATIONS Date 04/25/02 To: Bruce Rottner - DDC Bob Adams - DDC Ray Master - Bovis Lend Lease, LMB John Rabovsky - LMG Vic Hillman - LMG Mike Ramsey - LMG Mike Donavan - ATC From: Donald A. Weber RE:, WTC 5 Mold Assessment - Non Viable (spore) Results

Bruce,

Mike Donovan of ATC Associates and I conducted an assessment of mold on 4/23/02. We collected samples in two areas of WTC 5 B4, in the NE stairway leading from the loading dock and outside at the ATC trailer. We collected samples for non-viable airborne fungi, viable airborne fungi and bacteria and bulk samples for microbial analysis.

Analytical results for fungal spores are attached . The balance of the results should be available within several days due to the need for culturing and “growing” the samples The results reported here quantify total fungal spores and provide general identification guidance.

Sample #16 —A3-1 VaultSuspect Possible was not a usable sample due to equipment problem. Sample #17 was collected at the same location. As a result of our observations and attached sample results the following recommendation is submitted:

IH02-12; Management and Remediation of WTC 5 Mold

Reduce exposures to mold to the lowest feasible level. This should be accomplished by implementing the following controls at a minimum:

• Upgrade barriers to airtight seals in stairwells leading to WTC5 B4.

• Label these entry points as permit required confined spaces (based on restricted means of egress and acute hazard presented by very high bioaerosol levels)..

• Manage entry into the space under the sites PRCS program.

• Enforce minimum PPE guidelines previously recommended including full face respirators with tri­ combination filters, full body coverings- Tyvek suits, protective gloves and shoe coverings.

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NYC-WTC_000205426