Chain of custody for bulk sampling at 385 South End

NYC 9/11 Public Portal Document

TESTING (ELPAT) PROGRAM ENVIRONMENTAL LEAD PROFICIENCY ANALYTICAL INDIVIDUAL LABORATORY REPORT FOR ROUND 021 LAB ID=07054 DECEMBER 16, 1997 ATC ASSOCIATES, INC. NY, NEW YURK, NY 10010

REFERENCE ACCEPTABLE RANG'c LAB 9 2 b -_-'- SAMPLE RE?+7ATED VALUES * LOWER UP(FR PERFORMANCE SCORE SAMPLE TYPE 40. RESULTS

1 1.e933 1.0578 0.864 E.c5a6 A 0.39 Paint Cnips (%) 0.0452 0.0328 0.05Th e 0.1i 2 0.0459 3 7.756 6.6414 4.5218 8.7609 1.58 0.5141 0.395 0.6332 A -0.36 4 0.4999

463.5 387.3 539.7 A -0.15 Soi l (mg/kg) 1 459.6 830.8 675.6 985.9 A 0.31 2 846.9 3 78.8 69.2 46.5 91.8 A 1.28 342.4 347.2 262.2 432.3 A -0.17 4

269.5319 198.4 340.7 A 0.03 Oust Wipes (ug) i 270.3 159.5374 111.5 207.5 A 0.2;' 2 163.8 79.2462 53.9 'C•:.f A 0.16 3 80.6 735.3033 592.8 ?r, •8 a 54 4 704.9

Laboratories Reference value is the mean of the reference standard deviations # Upper limit: reference value + 3 deviations Lower limit: reference value - 3 standard A: Analysis acceptable; -: Results not reported s < tower Limit, not acceptable H: Results > upper limit, L: Results (reported result -reference va(ue)/standard deviation b 2 Score = is based on z-scores. Note: the acceptabtity of reported results acceptable according to This is why a reported result may appear outlier. performance limits, but be identified as an

LABORATORY YEAR-TO-DATE PERFORMANCE REPORT LAB 1D=07054

ROUND ROUND * ACCUMULATED PERFORMANCE PROFICIENCY • PERFORMANCE 4 ROUNDS(:) 2 "ROUNDS(") RATING SAMPLE TYPE No.

018 4/4 Paint Chips (~) 019 4/4 020 4/4 4/4 16/16 100 8/8 100 P 021

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

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

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

NYC-WTC 000121457