Air sampling lab report for PAHs, Jan 2002

NYC 9/11 Public Portal Document

Mr Bernard P. Orlan January 22, 2002 Air Sampling for PAHs Page 2 H S of Economics & Finance f833M) ATCProiectNo 15-19125-0291

SAMPLING RESULTS

ATC submitted nine (9) samples PAHs (plus one blank) to PSC for analysis. A copy of the laboratory report is provided in the Attachment. Samples were collected from locations throughout the building The minimum collection time for each sample was ten (10) hours

Each sample was analyzed for sixteen (16) PAHs (See Attachment). Three PAHs were detected indoors and outdoors. The sample locations and concentrations are shown in the table

PAHs DETECTED Milligrams per cubic meter of air (mg/m^)

hAlcthylnaphthalcne

Outdoors, Main entrance 0 00026 0.00052 0.00099 PAH-1 Mam Lobby *BDL BDL 0 00028 PAH-2 3rd floor by Stair B 0 00022 0.00039 0 00058 PAH-3 5^^ floor. Stair A 0.00023 0.00046 0 00068 PAH-4 7^^r floor by bridge 0 00026 0.00047 0 00050 PAH-5 8th floor, Kitchen 0.00025 0.00048 0 00042 PAH-6 Room 906 BDL 0.00039 0.00045 PAH-7 Room 1006 0 00027 0.00053 0.00076 PAH-8 Roof by air intake BDL 0.00030 0 00037 PAH-9 Blank BDL BDL BDL PAH-10 *BDL = Below Detection Limit

1-Methylnaphthalene was detected in one of the two outdoor samples and in five of the seven indoor samples, all in comparable concentrations. 2-Methylnaphthalene was detected in both outdoor samples and in all but one indoor sample, concentrations were similar. Naphthalene was detected in all samples. The high and low indoor concentrations differed by a factor of 3 Outdoor concentrations also differed by a factor of 3, the higher concentration being detected in the main entrance sample Outdoors, higher concentrations of all three PAHs were found in the street level sample

CONFIDENTIAL, CITY_21MC100_003459274 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179438