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September 28, 2004 Lab ID STK436508 Ground Zero Analysis Customer 3-14996 Quality Control - Organic Constltuent Method Date/ID Type Units Conc QC Data DQO Note n-Burylbenzene 5242 09/20/2004 A209 BS ug/L 1000 83 4% 89-158 435 BSD ug/L 1000 83 1% 89-158 435 BSRPD ug/L 04% S 15 3 5242 09/20/2004 A 00-CCV ug/L 1000 854% 70-130 sec-Burylbenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 BS ug/L 1000 806% 92 147 435 BSD ug/L 1000 799% 92-147 435 BSRPD ug/L 0 8% 515 3 5242 09/20/2004 A 00-CCV ug/L 1000 83 4% 70-130 tert-Butylbenzene 5242 09/20/2004 A209 Blank ug/L ND <05 I BS ug/L 1000 78 7=% 79-140 BSD ug/L 1000 797% 79-140 BSRPD ug/L 1 3% 515 8 5242 09/20/2004 A 00-CCV ug/L 1000 81 3% 70-130 Carbon Tetrachloride 5242 09/20/2004 A209 Blank ug/L ND <0 5 BS ug/L 1000 103% 80-151 BSD ug/L 1000 108% 80-151 13SRPD ug/L 48% 520 6 524 2 09/20/2004 A 00-CCV ug/L 1000 102% 70-130 Chlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <05 BS ug/L 1000 84 5% 74-134 BSD ug/L 1000 87 9% 74-134 BSRPD ug/L 40% 516 9 I5242 09/20/2004 A 00-CCV 1 ug/L 1000 85 0% 70-130 Chloroethane 5242 09/20/2004 A209 Blank ug/L ND <05 BS ug/L 1000 101% 80-173 I BSD ug/L 100o 998% 80-173 BSRPD ug/L 0 8% S 16 1 5242 09/20/2004 A 00-CCV ug/L 1000 940% 70-130 I Chloroform 5242 09/20/2004 A209 Blank ug/L ND <05 BS ug/L 1000 941% 78-141 BSD ug/L 1000 104% 78-141 BSRPD ug/L t0 l% 5 17 6 I5242 09/20/2004 A 00 CCV ug/L 1000 93 1% 70-130 Chloromethane 5242 09/20/2004 A209 Blank ug/L ND <05 BS ug/L 1000 129% 68-I65 BSD ug/L 1000 115% 68-165 BSRPD ug/L 116% 515 7 5242 09/20/2004 A 00-CCV ug/L 1000 103% 70-130 2-Chlorotoiuene 5242 09/20/2004 A209 Blank ug/L ND <0 5 Report continued on next page ISTK436508 Quality Control Page 2 I