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1 <br /> January 21, 2005 Lab TD STK438872 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Urlrts Conc QC Data DQO Note <br /> Hexachlorobutadtene 5242 12/30/2004 A209 BS ug/L 1000 135% 57-148 <br />' BSD uglL 1000 140% 57 148 <br /> BSRPD ug/L 3 5% 524 4 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 172% 70-130 360 <br /> Isopropylbenzene 5242 12/30/2004 A209 Blank u2IL ND <05 <br /> BS ug/L 1000 111170 66-129 <br /> BSD ug/L 1000 126% 66-129 <br /> BSRPD ug1L 12 9% :5210 <br />' 5242 12/30/2004 A 00-CCV ug/L 1000 140% 70-130 360 <br /> p-Isopropyltoluene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 106% 66-134 <br /> BSD ug/L 1000 113% 66-134 <br /> BSRPD ug/L 62% 524 0 <br /> 5242 12/30/2004 A 00-CCV ug1L 1000 134% 70-130 360 <br />' Mi thyl cert Butyl Etht r (MTBE) 5242 12/30/2004 A209 Blank ug/L ND <1 <br /> BS ug/L 1000 58 6% 51-166 <br /> BSD ug/L 1000 800% 51-166 <br /> BSRPD ug/L 30 9% 5 36 4 <br /> 5242 12/30/2004 A 00-CCV uglL 1000 84 9% 70-130 <br /> Naphthalene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 127% 54-156 <br /> BSD ug/L 1000 163% 54-156 435 <br /> BSRPD ug/L 25 0% 528 1 <br /> 524 2 12/30/2004 A 00-CCV ug/L 1000 155%b 70-130 360 <br /> n-Propylbenzene 524 2 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 83 4% 63-134 <br />' BSD ug/L 1000 91 5% 63-134 <br /> BSRPD ug/L 9 3% 522 5 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 102% 70 130 <br />' Styrene 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 107% 69-123 <br /> BSD ug1L 10 00 123% 69-123 <br /> BSRPD ug/L 147% 517 6 <br />' 524 2 12/30/2004 A 00 CCV ug/L 10 00 126% 70-130 <br /> Tut amyl methyl Ether (TAME) 5242 12/30/2004 A209 Blank ug/L ND <3 <br /> BS ug/L 1000 98 3% 52442 <br />' BSD ug/L 1000 130% 52-142 <br /> BSRPD ug/L 3 2 53 00 410 <br /> 524 2 ][213012004 A 00 CCV ug/L 1000 117% 70-130 <br /> I 1 1 2 Tetrachloroethane j 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> Report continued on next page <br /> ISTK438872 Quality Control Page 6 <br />