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September 28, 2004 Lab ID STK436510 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Cone QC Data DQO Note <br />' 2-Chlorotoluene 5242 09/20/2004 A209 BS ug/L 1000 872% 83-155 <br /> BSD i ug/L 1000 879% 83-155 <br /> BSRPD ug/L 09% 517 1 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 89 7% 70-130 <br />' 4-Chlorotoluene 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 929% 87-146 <br /> BSD ug/L 1000 927% 87-146 <br />' BSRPD ug/L 02% 515 6 <br /> 524 2 09/20/2004 A 00-CCV ug/L 1000 93 5% 70-130 <br /> Di-isopropyl ether (DIPE) 5242 09/20/2004 A209 Blank ug/L ND <3 <br />' BS ug/L 1000 104% 76-146 <br /> BSD ug/L 1000 I19% 76-146 <br /> BSRPD ug/L 1 5 53 00 <br />' 524 2 09/20/2004 A 00-CCV ug/L 1000 100% 70-130 <br /> Dibromochloromethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 96 6% 82-143 <br /> BSD ug/L 1000 109% 82-143 <br /> BSRPD ug/L 11 6% S 19 4 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 943% 70-130 <br />' Dtbromomethane 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 98 1% 87-132 <br /> BSD ug/L 1000 117% 87-132 <br /> BSRPD ug/L 173% :519 3 <br /> I5242 09/20/2004 A 00-CCV ug/L 1000 975% 70-130 <br /> 1 2 Dichlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 10 00 897% 86-147 <br /> BSD ug/L 1000 95 3% 86-147 <br /> BSRPD ug/L 6 1% 520 6 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 859% 70-130 <br /> 1 3-Dichlorobenzene 5242 09/20/2004 A209 Blank ug/L IND <05 <br /> BS ug/L 1000 860% 87-141 435 <br /> BSD ug/L 1000 894% 87-141 <br /> BSRPD ug/L 3 9% 516 2 <br />' 5242 09/20/2004 A 00-CCV ug/L 1000 893% 70-130 <br /> 1 4-DlLhlorobenzene 524 2 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 965% 86-146 <br /> BSD ug/L 1000 104% 86-146 <br /> BSRPD ug/L 7 1% i518 6 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 98 8% 70-130 <br /> 1 2 Dichlorobenzene d4-Surrogate 5241 09/20/2004 A209Blank ug/L 1000 840% 70-130 <br /> Report continued on next page <br /> STK436510 Quality Control Page 3 <br />