Chain of custody for bulk sampling at 385 South End

NYC 9/11 Public Portal Document

ANALYTICAL TESTING (ELPAT) PROGRAM ENVIRONMENTAL LEAD PROFICIENCY 022 INDIVIDUAL LABORATORY REPORT FOR LAB 1D=07054 ORTCF SROND199 NY, NEW YORK, NY 10010 ATC ASSOCIATES, INC.

ACCEPTABLE RANGE f! LAB a 2 & SAMPLE REPORTED REFERENCE PERFORMANCE SCORE NO. RESULTS VALUES • LOWER UPPER SAMPLE TYPE -------------------- ----------------- 1.7171 A -0. 9 1.4275 ; 4607 1.2043 ""P rrt Chips (~) 1 0 1.100a A 0.66 2 0.086 0.0818 0.0628 3.6256 5.5009 A -1.04 3 4.2394 4.5632 0.5264 ;.764; A -0.52 4 0.6247 0.6454

292.3 429.4 A -0.40 1 351.6 360.8 Soi l (mg/kg) 76.8 73.2 49.7 96.7 A 0.46 2 986.5 A --3.69 3 799.3 834.5 682.5 683.2 560 806.3 A -0.81 4 649.9 •0-77 1 531.6 565.9373 432.1 699.8 A .0.47 Oust Wipes (u9) A 123.5 128.9551 94.1 16S 2 272.0263 198.9 ',45 2 A 0.02 3 272.6 1076 A -0.53 4 863.1 895.2703 714.6

of-t referer+ca..laboratories • Reference value is the man referen.e:.w(ue + 3 standard deviations # Upper limit: 3 standard deviations Lower limit: reference value - acceptable; -: Results not reported a A: Analysis Results < lower limit, not acceptable H: Results > upper Limit, L: resutt-reference value)/standard deviation 8 2 Score = (reported of reported results is based on z-scores. Note: the acceptablity according to reported result may appear acceptable This is why a as an outl ier. - - performance t mits, but be identified

REPORT LABORATORY YEAR-TO-OAJE PERFORMANCE LAS ID=07054

ACCUMULATED PERFORMANCE PROFICIENCY ROUND ROUND * 2 ROUNDS() RATING 9 NO. PERFORMANCE 4 RCUNOS(-) SAMPLE TYPE --------------- --------- ---- 019 4/4 Paint Chips (%) 020 4/4 021 4/4 100 8/8 100 P 022 4/4 . 16/16

020 4/4 Soil (mg/kg) 021 4/4 4/4 12/12 100 8/8 100 P 022

019 4/4 Dust Wipes (ug) 4/4 020 021 4/4 16/16 100 8/8 100 P 022 4/4

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

NYC-WTC 000121456