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March 31, 2004 Lab ID STK431889 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units I Cone QC Data DQO Note <br /> 2-Chlorotoluene 5242 03/28/2004 A209 BS ug/L 1000 112% 83-155 <br /> BSD ug/L 1000 97 156 83-155 <br /> BSRPD ug/L 144% 517 1 <br /> 5242 03/28/2004 A 00-ccv ug/L 1000 109% 70-130 <br /> 4-Chlorotoluene 5242 03/28/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 101% 87-146 <br /> BSB ug/L 1000 866—% 87-146 <br /> BSRPD ug/L 151% 515 6 <br /> 524 2 03/28/2004 A 00-ccv ug/L 1000 923% 70-130 <br /> Dr-isopropyl ether (DUPE) 5242 03/28/2004 A209 Blank ug/L ND <3 <br /> BS ug/L 1000 919% 76-146 <br /> BSD ug/L 1000 644% 76-146 435 <br /> BSRPD ug/L 28 53 00 <br /> 5242 03128/2004 A 00-CCv ug/L 1000 83 8% 70-130 <br /> Dtbromochloromethane 5242 033/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 953% 82-143 <br /> . BSD ug/L 1000 840% 82-143 <br /> BSRPD ug/L 126% 519 4 <br /> 5242 03/28/2004 A 00-CCv ug/L 1000 910% 70-130 <br /> Dtbromomethane 5242 0312812004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 935% 87-132 <br /> BSD ug/L 1000 808% 87-132 435 <br /> 13SRPD ug/L 146% :519 3 <br /> 5242 03/28/2004 A 00-CCv ug/L 1000 85 6% 70-130 <br /> 1,2-Dichlorobenzene 5242 03/28/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 982% 86-147 <br /> BSD ug/L 10 00 835% 86-147 435 <br /> BSRPD ug/L 162% 520 6 <br /> 5242 03/28/2004 A 00-CCv ug/L 1000 866% 70-130 <br /> 1 3-Dichlorobenzene 524 2 03;2812004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 960% 87-141 <br /> BSD ug/L 10 00 817% 87-141 435 <br /> BSRPD ug/L t6 0% s 16 2 <br /> 5242 03/28/2004 A 00-CCv ug/L 1000 87 9% 70-130 <br /> 1 4-Dichlorobenzene 5242 03/28/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 958% 86-146 <br /> BSD ug/L 1000 83 4% 86-146 435 <br /> BSRPD ug/L 139% 518 6 <br /> 5242 03/28/2004 A 00-CCv ug/L 1000 84 8% 70-130 <br /> . 1 ? Dichiorobenzene-4-Surrogate 1 5242 L 03/28/2004 A209 Blank ug/L 10 00 86 8% 70430 <br /> Report continued on next page <br /> STK431889 Quality Control Page 3 <br />