NYC-WTC_000204880

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan December 13, 2002 Air Sampling for VOC’s Page 2 Francis Lewis High School (0374) ATC Project No. 15-19125-0374

TABLE 1 AIRBORNE CONCENTRATIONS OF SELECTED VOLATILE ORGANTIC COMPOUNDS

LOCATION (ppb)* III __________ SSi Basement by elevator <0.9 BENZENE Boiler Room <0.6 Room 134 <0.8 Room 122 <0.6 Room 104 <0.6 Outdoors <0.6 Basement by elevator 3 Boiler Room 1 TOLUENE Room 134 1 Room 122 1 Room 104 1 Outdoors 1 Basement by elevator <1 Boiler Room <0.4 ETHYL BENZENE Room 134 <0.4 Room 122 <0.4 Room 104 <0.2 Outdoors ND Basement by elevator 5 TOTAL Boiler Room 1.7 XYLENES Room 134 1.5 Room 122 2 Room 104 <1.4 Outdoors <0.8 Basement by elevator 5 Boiler Room <0.8 METHYL TERT­ Room 134 1 BUTYL ETHER . Room 122 <0.7 (MTBE) Room 104 <0.6 Outdoors 1 * parts per billion

Benzene

Benzene was present just above the limits of detection but below levels that could be specifically quantified. Two indoor levels (<0.8 - <0.9 ppb) were slightly above that detected outdoors and in the other four samples (<0.6 ppb). The Environmental Protection Agency (EPA) has set a screening level for benzene, based on one-year continuous exposure, of 20 ppb. The levels here are below the EPA screening level.

CITY_21MC100_006753553

NYC-WTC_000204881