NYC-WTC_000231976

NYC 9/11 Public Portal Document

Table 3 PHASE I - MINIMUM AIR SAMPLE PHASE-IN SCHEDULE

PHASE I - SOUTH PHASE I - COPC PHASE I - SOUTH PHASE I - HOIST/VESTIBULE PHASE I - ABATEMENT HOISTATESTIBULE SCAFFOLD CONSTRUCTION SCAFFOLD CELLAR & CONSTRUCTION - ERECTION PHASE I - COPC BACKGROUND UP TO lOTH ROOFTOP ERECTION UP BOTTOM 8 lOTH Io 40TH ABOVE lOTH ABATEMENT WORK PHASES AIR SAMPLING FLOOR CLEANING TO lOTII FLOOR FLOORS FLOOR FLOOR TOP DOWN PHASE II

ON-SITE GROUND LEVEL STATIONS 4 4 4 4 4 4 4 4 4

ON-SITE ELEVATED STATIONS 4 (Roof) 4 (Scaffold*) 4 (Scaffold**) 4 (Scaffold**)

OFF-SITE ELEVATED STATIONS 1 1 i 1 1 4 4 4 4

* First Elevated Scaffold station to be installed at 10th floor when scaffold leading edge is at 12th floor. When leading edge is at 22nd floor, stations to he moved to 20th floor. When leading edge is at 32nd floor, stations to be installed on 30th floor as feasible. o 1^ ** Downward moving of Elevated Scaffold stations will be based on highest reasonable floor in relationship to work as will be determined in consultation with RPA. o m

o J] □0

'o > z z >

s c □0 l"” o o 130 Liberty Street Rev. No.: 0 o o Ambient Air Monitoring Program 6-3 September 7, 2005 on o 00 CD

NYC-WTC_000231996