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I <br /> March 30, 2005 Lab ID STK531973 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> 1 <br /> Constituent Method Date/ID Type Units Cone QC DataDQO Note <br />' 1 2 Dichlorobenzene d4-Surrogate 5242 03/23/2005 A209 BS ug/L 1000 129% 70-130 <br /> BSD ug/L 1000 1127o 70-130 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 119% 70-130 <br />' Dichlorodifluoromethane 524 2 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 56 6% 47-143 <br /> SSD ug/L 1000 51 4% 47-143 <br />' BSRPD ug/L 9 6% 533 5 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 795% 70-130 <br /> 1,1-Dichloroethane 1242 03/23/2005 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 776% 43-170 <br /> BSD ug/L 1000 73 0% 48-170 <br /> BSRPD ug/L 6 1% 521 2 <br />' 524 2 03/23/2005 A 00-CCV ug/L 1000 74 7% 70-130 <br /> 1,2-Dichloroethane 5242 03/23/2005 A209 Blanc, ug/L ND <0 5 <br /> BS ug/L 1000 12650 60-160 <br /> BSD ug/L 1000 1057o 60- <br /> BSRPD ug/L ]88 0:70 5244 2 2 <br /> 524 2 03/23/2005 A 00-CCV ug/L 1000 110% 70-130 <br /> 1,1-Dichloroethylene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 847% 41-183 <br /> BSD ug/L 1000 824% 41-183 <br /> BSRPD ug/L 2 8% 519 3 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 83 6-o 70-130 <br /> cis-1 2-Dichloroethylene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 87 7% 55-156 <br />' BSD ug/L 1000 83 1% 55-156 <br /> BSRPD ug/L 5 4% 526 8 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 845% 70-130 <br />' trans-l,2-Dichloroethylene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 82 7% 42-177 <br /> BSD ug/L 1000 800% 42-177 <br />' BSRPD ug/L 3 4% 520 4 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 80 1% 70-130 <br /> Dichloromethane 524 2 03/23/2005 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 111% 62-161 <br /> BSD ug/L 10 00 94 4% 62-161 <br /> BSRPD ug/L 1601. 519 3 <br />' <br /> 5242 03/23/2005 A 00 CCV ug/L 1000 100% 70-130 <br /> 12-Dichloropropane 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> 0 — <br /> Report continued on next page <br /> STK531973 Quality Control Page 4 <br />