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. March 30, 2005 Lab ID STK531971 <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 10 00 129`7 70-130 <br /> SSD ug/L 1000 112% 70-130 <br /> 5242 03/23/2005 A 00-CCV ug/L 10 00 119% 70-130 <br />' Dichlorodifluoromethane 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 366% 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 6% 48-170 <br /> BSD ug/L 1000 73 0% 48-170 <br /> BSRPD ug/L 6 1% 521 2 <br /> 5242 03/23/2005 A 00-CCV ug/L t0 00 747% 70-130 <br />' 1,2-Dichloroethane 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 126% 60-160 <br /> BSD ug/L 1000 10570 60-160 <br /> BSRPD ug/L 18 010 524 2 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 110% 70-130 <br /> 1 1-Dtchloroethylene 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L to 00 84 7% 41-183 <br /> BSB ug/L 10 00 82 4% 41-183 <br /> BSRPD ug/L 2 8% 519 3 <br />' <br /> 5242 03/23/2005 Aoo-CCV ug/L 1000 836% 70-130 <br /> cis-1,2-Dtchloroethylene 5242 03/23/2005 A209IBS <br /> Blank ug/L ND <05 <br /> ug/L 10 00 87 7% 55-156 <br /> BSD ug/L 1000 83 1% 55-156 <br /> BSRPD ug/L 54% 526 8 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 845% 70-130 <br />' <br /> trans-l,2-Dtchloroethylene 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 8277o 42-177 <br /> BSD ug/L 10 00 800% 42-177 <br /> BSRPD ug/L 34% 520 4 <br />' 5242 03/23/2005 A 00-CCV ug/L 10 00 80 1% 70-130 <br /> Dichloromethane 5242 03/23/2005 A2o9 Blank ug/L ND <05 <br /> BS ug/L 1000 111% 62-161 <br /> I BSD ug/L 1000 94 4% 62-I61 <br /> BSRPD ug/L 16 0'f0 519 3 <br /> 524 2 03/23/2005 A I00-CCV ug/L 10 00 100% 70-130 <br /> t12-Dtchloropropane 524 2 03/23/2005 A209 Blank ug/L ND <0 5 <br /> aReport continued on next page <br /> STK531971 Quality Control Page 4 <br />