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March 31, 2004 Lab 1D STK431886 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Conc QC Data DQO Note <br /> Plerachlorobutadiene 5242 03 23/2004 A209 BS ug/L 1000 102% 73-154 <br /> BSD ug/L 1000 982% 73-154 <br /> BSRPD ug/L 40% 515 8 <br /> 524 2 03/23/2004 A 00-CCV ug/L 1000 93 9% 70-130 <br /> Isopropylbenzene 5242 0323/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 122% 88-143 <br /> SSD ug/L 1000 116% 88-143 <br /> BSRPD ug/L 5 3% 517 0 <br /> 5242 03123/2004 A 00 CCV ug/L 1000 113% 70-130 <br /> p-Isopropyltoluene 5242 03 2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 126% 88-153 <br /> BSD ug/L 1000 119% 88-153 <br /> BSRPD ug/L 59% 514 8 <br /> 5242 0x/2312004 A 00-Ccv ug/L 1000 109% 70-130 <br /> Methyl tert Bury[ Ether (MTBE) 5242 03 2312004 A209 Blank ug/L ND <1 <br /> BS ug/L 1000 83 8% 62-143 <br /> BSD ug/L 1000 88 5% 62-143 <br /> BSRPD ug/L 54% 517 6 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 102% 70-130 <br /> Naphthalene 5242 0- 2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 969% 63-165 <br /> BSD ug/L 1000 96 2% 63-165 <br /> BSRPD ug/L 07% 530 6 <br /> 5242 0.)123/2004 A 00-CCV ug/L 1000 111% 70-130 <br /> n-Propylbenzene 524 2 03 2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 123% 85-152 <br /> BSD ug/L 1000 115% 85-152 <br /> BSRPD ug/L 65% 515 6 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 114% 70-130 <br /> Styrene 5242 03 23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 106% 85-149 <br /> BSD ug/L 1000 994% 85-149 <br /> BSRPD ug/L 6 1% 516 8 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 103% 70-130 <br /> Tert amyl methyl Ether (TAME) 524 2 03 23/2004 A209 Blank ug/L ND <3 <br /> BS ug/L 1000 962% 67-129 <br /> BSD ug/L 1000 910% 67-129 <br /> BSRPD ug/L 048 53 00 <br /> 5242 0-123/2004 A 00-CCV ug/L 1000 980% 70-130 <br /> . IL171 2 Tetrachloroethane 5242 03 2312004 A209 Blank. ug/L ND <05 <br /> Report continued on next page <br /> STK431886 Quality Control Page 6 <br />