Chain of custody for air monitoring at 365 South End

NYC 9/11 Public Portal Document

STING PROGRAM LABE~TORRYAREP REPORT ROUND 021 ENVIRONMEHTAIND~DUALfL LAB ID=07054 DECEMBER 16, 1997 ATC ASSOCIATES, INC. HT, NEW TURK, NY 10010

~..r~ ACCEPTABLh RANGE LAB d Z -J=--~ SAMPLE REPORTED REFERENCE 'may s VALUES * LOWER UP.-FR PERFORMANCE SCORE SAMPLETYPE N0, RESULTS -----' ----'r- 5;6------A---- -------------------- -------------------- 0.39 1.0578 0.564 Paint Cnips (X) 1 1.0833 0,0328 - 0.057> > 2 0.0459 0.0452 1.58 3 7.756 6.6414 4.5218 8.7609 0.395 0.6332 A -0,36 4 0.4999 0.5141

387.3 539.7 A -0.15 1 459.6 463.5 Soil (mg/kg) 830.8 985.9 A 0.31 2 846.9 . 6466 A .38 3 78.8 69.2 -0.17 347.2 262.2 432.3 A 4 342.4

1 270.3 269.5319 198.4 340.7 A 0.03 Oust Wipes (ug) 0.2r' 163.8 159.5374 111.5 207.5 A 2 53.9 'C4.Fn A 0.16 f 3 80.6 79.2462 4 704.9 735.3033 5922.8 A 7 T .0 A ' .64

of the reference Laboratories * Reference value is the mean value + 3 standard deviations 9 Upper Limit: reference standard deviations Lower Limit: reference value - 3 acceptable; -: Results not reported e A: Analysis < tower Limit, not acceptable Limit, L: Results H: Results > upper value)/standard deviation result -reference S Z Score = (reported is based z-scores. results Note: the acceptabiity of reported why a reported result may appear acceptable according to This ;s as an outlier. ---- performance Limits, but be identified

REPORT LABORATORY TEAR-TO-OATE PERFORMANCE LAB ID=07054

ACCUMULATED PERFORMANCE PROFICIENCY ROUND ROUND * 2 ROUNDS(%) RATING # NO. PERFORMANCE 4 ROUNDS(%) SAMPLE TYPE

018 4/4 Point Chips (X) 019 4/4 020 4/4 16/16 100 8/8 100 P 021 4/4

020 4/4 Soil (mg/kg) 8/8 100 8/8 100 P 021 4/4

018 4/4 Dust wipes (ug) 019 4/4 020 4/4 8/8 100 P 4/4 16/16 100 021

analyzed. the number of total samples * The denominators represent numerators represent the number of acceptable results. The -: Not Rated NP: Nonproficient P : Proficient accumulated results over four rounds Performance ratings are based on dust in ground paint chips, soil, or (one year). A lab's performance -fourths (75X) or more of the three wipes is rated proficient (P), if: 1) acceptable or 2) for the last acc:.rtu(ated results over four rounds are analyzed and the results are 100 % acceptable. two rounds, all samoJes are

NYC-WTC 000119946