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• March 31, 2004 Lab ID STK431885 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID TTYpe Units Conc. QC Data DQO Note <br /> Hexachlorobutadtene 5242 0212312004 A209 BS ug/L 1000 102% 73-154 <br /> BSD ug/L 1000 98 2% 73-154 <br /> BSRPD ug/L 40% 515 8 <br /> 5242 03/23/2004 A 00-ccv ug/L 1000 93 9% 70-I30 <br /> isopropylbertzene 5242 03 2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 122% 88-143 <br /> BSD ug/L 1000 116% 88-143 <br /> BSRPD ug/L 53% 517 0 <br /> 5242 03/23/2004 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 5 9% 514 8 <br /> 5242 0/23/2004 A 00-CCV ug/L 1000 109% 70-130 <br /> Methyl ten-Butyl Ether (MTBE) 524 2 0312312004 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 /> 524 2 03/33/2004 A 00-CCV ug/L 1000 1025 70-130 <br /> Naphthalene 5242 03 2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 969% 63-165 <br /> BSD ug/L 1000 962% 63-165 <br /> BSRPD ug/L 07% 5 30 6 <br /> 524 2 03123/2004 A 00-CCV ug/L 1000 111% 70-130 <br /> n-Propylbenzene 524 2 03 23/2004 A209 Blank ug/L ND <0 5 <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) 5242 012- 2004 A209 Blank ug/L ND <3 <br /> BS ug/L 1000 862% 67-129 <br /> BSD ug/L 1000 910% 67-129 <br /> BSRPD ug/L 048 S3 00 <br /> 5242 0_ 23/2004 A 00-CCV ug/L 1000 990% 70-130 <br /> 1,! 1 2-Tetrachloroethane 524 2 0 2312004 A209 Blank ug/L NO <05 <br /> Report continued on next page <br /> STK431885 Quality Control Page 6 <br />