Sample batch list, DEP Labs, December 18 2001

NYC 9/11 Public Portal Document

Element: -K Seq. No.: 55 AS Log.: Date: 12/18/2001 Sample ID: 27771

Repl SampleConc StndConc BlnkCorr Time # pg/L pg/L Signal 1 2288 2288 0.391 14:41:39 Sample absorbance is greater than that of the highest standard. 2 91.49 91.49 0.021 14:41:46 3 -77.74 -77.74 -0.008 14; 41;53 4 -77.26 -77.26 -0.008 14:42:00 Mean 556.1 556.1 0.099 SD 1157 1157 0.195 %RSD 208.1 208.1 196.79

Element: K Seq. No.: 56 AS Log.; Date: 12/18/2001 Sample ID: QCS

Repl SampleConc StndConc BlnkCorr Time # pg/L pg/L Signal 1 502.8 /502.8 0.090 14:42:15 2 504.8 / 504.8 0.090 14:42:22 3 502.3 502.3 0.090 14:42:29 4 494.9 494.9 0.089 14:42:37^ Mean 501.2 501.2 0.090 SD 4.334 4.334 0.001 %RSD 0.86 0.86 0.81

Element: K , Seq. No.; 57 AS Log.; Date; 12/18/2001 Sample ID: Blk

Repl SampleConc StndConc BlnkCorr Time # ng/L pg/L Signal 1 -39.52 -39.52 -0.001 14:43:01 2 -43.00 -43.00 -0.002 14:43:08 3 -42.33 -42.33 -0.002 14:43:15 4 -42.02 -42.02 -0.002 14:43:22 Mean: -41.72 -41.72 -0.002 SD ; 1.519 1.519 0.000 %RSD: 3.64 3.64 15.61

Element: K Seq. No.: 58 AS Log.: Date; 12/18/2001 Sample ID: 27772

Repl SampleConc StndConc BlnkCorr Time # pg/L pg/L Signal ' 1 515.9 515.9 0.092 14:43:49 2 510.3 510.3 0.091 14:43:56 3 517.3 517.3 0.093 14:44:04 4 502.3 ■ 502.3 0.090 14:44:11 Mean: 511.4 511.4 0.092 SD : 6.818 6.818 0.001 %RSD: 1.33 1.33 1.25

Page 6

NYC-WTC_000084054