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• March 31, 2004 Lab ID STK431887 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Con C. QC Data DQO Note <br /> 2-Chlorotoluene 5242 03/23/2004 A209 BS ug/L 1000 104% 83-155 <br /> BSD ug/L 1000 105% 83-155 <br /> BSRPD ug/L 05% -.517 1 <br /> 5242 03/23/2004 A 00-CCV uglL 1000 114% 70-130 <br /> 4-Chlorotoluene 5242 0323/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 34 6% 87-146 435 <br /> BSD ug/L 1000 33 0% 87-146 435 <br /> BSRPD ug/L 49% 515 6 <br /> 5242 03/23/2004 A 00-CCV ug/L 10 00 118% 70-130 <br /> Di-tsopropyl ether (DIPE) 524 2 03/23/2004 A209 Blank ug/L ND <3 <br /> BS ug/L 1000 106% 76-146 <br /> BSD ug/L 1000 106% 76-146 <br /> BSRPD ug/L 0 045 53 00 <br /> 5242 03/23/2004 A 00 CCV ug/L 1000 117% 70-130 <br /> Dtbromochloromethane 5242 0:1231200.4 A209 Blank ug/L ND <05 <br /> • BS ug/L 1000 83 6% 82-143 <br /> BSD ug/L 1000 866% 82-143 <br /> BSRPD ug/L 35% 519 4 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 973% 70-130 <br /> Dtbromomethane 5242 0323/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 89 1% 87-132 <br /> BSD ug/L 1000 915% 87-132 <br /> BSRPD ug/L 26% 519 3 <br /> 524 2 03/23/2004 A 00-CCV ug/L 1000 102% 70-130 <br /> 1,2-Dichlorobenzene 5242 0323/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 104% 86-147 <br /> BSD ug/L 1000 97 1% 86-147 <br /> BSRPD ug/L 66% 520 6 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 1 105% 70-130 <br /> 13-Dichlorobenzene 5242 03,23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 102% 87-141 <br /> BSD ug/L 1000 967% 87-141 <br /> BSRPD ug/L 5 6% 516 2 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 102% 70-130 <br /> 1,4-Dichlorobenzene 5242 0323/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 103% 86-146 <br /> BSD ug/L 1000 969% 86-146 <br /> BSRPD ug/L 5 7% s186 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 98 6% 70-130 <br /> • 1 2 Dichlorobenzene-d4-Surrogate 5242 0323/2004 A209 Blank ug/L 1000 702% 70-130 <br /> Report continued on next page <br /> STK431887 Quality Control Page 3 <br />