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S April 28, 2004 Lab ID STK432106 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Cone QC Data DQO Nate <br /> I 2-Dtbromoethane (EDB) 8260E 04/02/2004 A 00-CCV ug/L 5000 103% 70 130 <br /> Dtbromotluoromethane-Surrogate 5030B 04/01/2004 A233 Blank ug/L 2500 109% 75-156 <br /> LCS ug/L 2500 107% 75-156 <br /> MS ug/L 2500 112% 75-156 <br /> (STK432022-01) MSD ug/L 2500 112% 75-156 <br /> 8260B 04/02/2004 A 01-CCV ug/L 2500 103% 70-130 <br /> 1,2-Dtchloroethane 5030B 04/01/2004 A233 Blank ug/L ND <1 <br /> 8260B 04/02/2004 A 00-CCV ug/L 5000 108% 70 130 <br /> 1 2-Dichloroethane d4-Surrogate 5030B 04/01/2004 A233 Blank ug/L 25 00 101% 73-129 <br /> LCS ug/L 25 00 993% 73-129 <br /> MS ug/L 25 00 107% 73-129 <br /> (STK432022-01) MSD ug/L 2500 107% 73-129 <br /> 8260E 04/02/2004 A 01-CCV ug/L 2500 103% 70-130 <br /> Ethyl Benzene 50308 04/01/2004 A233 Blank ug/L ND <1 <br /> 8260B 04/02/2004 A 00-CCV ug/L 5000 973% 80 120 <br /> • Ethyl tert-butyl ether (ETRE) 5030E 04/01/2004 A233 Blank ug/L ND <2 <br /> 8260B 04/02/2004 A 00-CCV ug/L 5000 117% 50 150 <br /> Methyl ten butyl ether (MTBE) 5030E 04/01/2004 A233 Blank ug/L ND <2 <br /> 826013 04/02/2004 A 00-CCV ug/L 5000 136% 70-130 360 <br /> Toluene 5030B 04/01/2004 A233 Blank ug/L ND <1 <br /> LCS ug/L 5000 100% 78-122 <br /> MS ug/L 5000 103% 6I-132 <br /> (STK432022-01) MSD ug/L 5000 98 3% 61-132 <br /> MSRPD ug/L 45% 523 6 <br /> 8260B 04/02/2004 A 00-CCV ug/L 5000 98 8% 80-120 <br /> Toluene-d8 Surrogate 5030B 04/01/2004 A233 Blank ug/L 2500 997% 85-109 <br /> LCS ug/L 2500 979% 85-109 <br /> MS ug/L 2500 101% 85-109 <br /> (STK432022-01) MSD ug/L 2500 100% 85 109 <br /> 8260B 04/02/2004 A 01-CCV ug/L 25 00 101% 70 130 <br /> Xylenes in p 5030B 04/01/2004 A233 Blank ug/L ND <i <br /> 8260B 04/02/2004 A 00-CCV ug/L 1000 960% 70-130 <br /> Explanations and definitions are continued on next page <br /> STK432106 Quality Control Page 3 <br />