Legal hold notice for WTC documents, undated

NYC 9/11 Public Portal Document

the forward command center to evaluate a condition in the verizon building. DERTA determined the gas odor was hydrogen sulfide caused by fill decay or sewer gas in the basement of the verizon buildi 'g. This condition was then referred to die verizon safety personnel.

DERTA has surveyed other areas inside the perimeter in an effort to target potential sites to be opened. DERTA does not believe that it will be possible to clear any other areas because of the close proximity to ground zero. Major woik at ground zero would have to be completed before we could reassess the feasibility of opening another area.

The five boro sample results were normal. The daily ground zero monitoring for dangerous gases was negative.

Air monitoring around the perimeter and in selected areas were as follows:

Park Place & Church 0.01 Fibers/cc Park Place & Greenwich 0.014 Fibers/cc Murray & Church <0.007 Fibers/cc Murray & Greenwich <0.01 Fibers/cc Trinity & Thames 0.013 Fibers/cc West Street & Albany Street <0.01 Fulton & Church 0.026 Third place <0.008 West of Thames st <0.008 North End ave and Warren <0.007 North End Ave and Park Pl <0.007 River Terrace and Vessey <0.007 West s» and Warren <0.008 Gateway Plaza at Park area 0.02 River Terrace and Warren 0.009 Albany st and South End Ave! <0.007 Rector place 0.029 River Terrace and Park Place <0.008 River Terrace and Chambers <0.008

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