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Chain of custody for air monitoring at 365 South End

Machine-extracted title · confidence 95%

Record documenting the transfer and custody of air samples from 365 South End Avenue collected on October 17, 2001.

NYC-WTC_000119908–000119950

Folder label: “365 345 SOUTH END AV 1083375, 16/100

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NYC 9/11 Public Portal Document

LABORATORYANALYTICAL FORTESTING AT? PROGRAM ENVIRONMENTAL PROFICIENCY ROUNDf024 INDIVIDUAL LAB 1.p=07054 SEPTEMBER 23, 1998 ATC A OC.ATES INC., NEW YORK, NY 10010 iJM

ACCEPTABLE RANGE # LAB d Z & SAMPLE REPORTED REFERENCE VALUES • LOWER UPPER PERFORMANCE SCORE NO. RESULTS SAMPLE TYPE 1 ... 0.?432 0.5812 ------------------------ ---u52 A -1.57 0.6582 0.2127 0.1492 0.2762 A 1.77 n.1752 0,0524 nji?7 0.'672 A -0.29 3 0.051 3.3834 2.6436 4.1234 A •0.58 4 3.2413

440.6 354 527.2 A -1.38 ' 400.7 Soi l (mg/kg) 545.3 827.4 A -1.28 626.1 636.3 820.9 651.2 990.5 A -1.91 3 713,1 34.2 13. 1 55,3 A 0.81 39.9

57.8355 37.5 78.2 A 0.02 Dust wipes fug) 58 1127.0581 884 1370.2 A -0.98 2 1041.3 128.3887 93.4 163.4 A -0.11 3 127. 1 401 .3589 326 477.8 A - 1 .86 4 354.8

laboratories Reference value is the mean of the reference reference value * 3 standard deviations # Upper limit: deviations Lower limit: reference value - 3 standard a A: Analysis acceptable; : Results not reported Results < lower limit, not acceptable H: Results > upper limit, L: Score = (reported result -reference value)/standard deviation & Z results is based on z-scores. Note: the acceotablity of reported appear acceptable according to This is why a reported result may performance l imits, but be identified as an outl ier,

LABORATORY YEAR-TO-DATE PERFORMANCE REPORT LAB ID=07054

ACCUMULATED PERFORMANCE PROFICIENCY ROUND ROUND * -RFORMANCE --4 , -ROUNDS(- ) 2 ROUNDS(:) RATING # SAMPLE TYPE NO. P-c- -------- - --------`------------------------------- • --------- ------ Paint Chips (X) 021 4/4 022 4/4 023 4/4 4/4 16/16 100 8/8 100 P 024

021 4/4 Soil (mg/kg) 022 4/4 023 4/4 4/4 16/16 100 8/8 100 P 024

021 4/4 Dust wipes (ug) 022 4/4 023 4/4 4/4 16/16 100 8/8 100 P 024

number of total samples analyzed. The denominators represent the the number of acceptable results. The numerators represent Not Rated # P : Proficient NP: Nonproficient -:

results over four rounds Performance ratings ce,-based on accumulated ground paint chips, soi l , or dust (one year). A lab's er ormance in if: 1) three-fourths (75%) or more of the wipes is rated profici nt (P), acceptabie or 2) for the last accumulated results over four rounds are all samples are analyzed and the results are 100 ii acceptable. two rounds,

NYC-WTC 000119943

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NYC-WTC_000119943Source: NYC Law Department, mirrored locally

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