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← Document results/DEP Box 48/345 SOUTH END AVENUE Block: 16 Lot: 100 BIN: 1083375 395 South End Ave, Building #600
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Chain of custody for bulk sampling at 395 South End

Machine-extracted title · confidence 95%

Document tracking environmental samples collected from Building #600 at 395 South End Avenue on January 2, 2002.

NYC-WTC_000121516–000121803

Folder label: “345 SOUTH END AVENUE Block: 16 Lot: 100 BIN: 1083375 395 South End Ave, Building #600

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NYC 9/11 Public Portal Document

024AT) PROGRAM ENVIRONMENTAL ~ PROFICIENCY ANALYTICAL FORTESTING R INDIVIDUAL LABORATORY 07054 SEPTEMBER 23, 1998 LAS INC., NEW YORK, NY 10010 ATC AStOC RTES

ACCEPTABLE RANGE # LAB m Z & SAMPLE REPORTED REFERENCE LOWER UPPER PERFORMANCE SCORE VALUES SAMPLE TYPE N0 . RESULTS - --------•------------------ ,. _._..-. - ------ -------- 0.5812 0.5052 A -1.57 0.6582 0.7432 0.1492 0.2762 A -1.77 (1.1752 0.2127 0.0524 0.037 .,162 A -0.29 3 0.051 3.3834 2.6436 4.1232 A •0.58 4 3.2413

354 527.2 A -1.38 1 400.7 440.6 Soil (mg/kg) 545.3 827.4 A -1.28 626.1 696.3 651.2 990.5 A -1.91 3 713.1 820.9 13.1 55.3 A 0.81 39.9 34.2

37.5 78.2 A 0.02 58 57.8355 Oust Wipes (ug) 884 1370.2 A -0.98 2 1047.3 1127.0581 128.3887 93.4 163.4 A -0. 11 3 127.1 326 477.8 A -1.86 4 354.8 401.8589

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

LABORATORY YEAR-TO-DATE PERFORMANCE REPORT LAS 10=07054

ACCUMULATED PERFORMANCE PROFICIENCY ROUND ROUND-• 4 ROUNDS(%) 2 ROUNDS(..) RATING SAMPLE TYPE NO. PERFORMANCE

021 4/4 Paint Chips (X) 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 16/16 100 8/8 100 P 024 4/4

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

number of total samples analyzed. The denominators represent the represent the number of acceptable results. The numerators Not Rated P : Proficient NP: Nonproficient accumulated results over four rounds Performance ratings .abased on in ground paint chips, soil, or dust (one year). A lab's er ormance (P), if: 1) three-fourths (753.) or more of the wipes is rated profici nt rounds are acceptable or 2) for the last accumulated results over four rounds, all samples are analyzed and the results are 100 % acceptable. two

NYC-WTC 000121735

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NYC-WTC_000121735Source: NYC Law Department, mirrored locally

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