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March 30, 2005 Lab ID STK531972 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Conc QC Data DQO Note <br /> 1 2 Dichlorobenzene d4 Surrogate 5242 03/23/2005 A209 BS ug/L 1000 I2990 70-130 <br />' SSD ug/L 1000 112;'0 70-130 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 119% 70-130 <br />' Dichlorodifluoromethane 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 566% 47-143 <br /> BSD ug/L 1000 51 4% 47-143 <br /> BSRPD ug/L 96% 533 5 <br />' 5242 03/23/2005 A 00-CCV ug/L 1000 795% 70-130 <br /> 1 1-Dtchloroethane 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 77 61a 48-170 <br />' BSD ug/L 1000 73 0% 48-€70 <br /> BSRPD ug/L 6 1% 521 2 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 74 7% 70-130 <br />' 1,2-Dtchloroethane 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 12657o 60-160 <br /> BSD ug/L 1000 105%a 60-160 <br /> BSRPD ug/L 18 010 524 2 <br /> 524 2 03/23/2005 A 00-CCV ug/L 1000 €10% 70-130 <br /> 1,1-Dichlaroethylene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 84 7% 41-183 <br /> BSD ug/L 1000 82 4% 41-183 <br /> BSRPD ug/L 2 8% 519 3 <br /> 5242 03/23/2005 A 00 CCV ug/L 1000 83 6% 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 83 116 55-156 <br />' BSRPD ug/L 54% 526 8 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 843% 70-130 <br />' <br /> trans-l,2-Dshloroethylene 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 827% 42-177 <br /> BSD ug/L 1000 80 010 42-177 <br /> BSRPD ug/L 3 4% 520 4 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 80 1% 1 70-130 <br /> Dichloromethane 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 10 00 111% 62-161 <br />' BSD ug/L 1000 944% 62-161 <br /> BSRPD ug/L 160% s 19 3 <br /> 5242 03/23/2005 A 00-CCV ug/L 10 00 100% 70-130 <br />' 1,2-Dtchloropropane 524 2 03/23/2005 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> fSTK531972 Quality Control Page 4 <br />