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September 28, 2004 Lab ID STK436507 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ED Type Units Conc QC Data DQO Note <br />' 1 2-Dichlorobenzene d4-Surrogate 5242 09/20/2004 A209 BS ug/L 1000 118% 70-130 <br /> BSD ug/L 1000 124% 70-130 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 126`7 70-130 <br />' Dichlorodifluoromethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 95 7% 32-250 <br /> BSD ug/L 1000 856% 32-250 <br /> BSRPD ug/L 112% 5 16 4 <br />' 5242 09/20/2004 A 00-CCV ug/L 1000 772% 70-130 <br /> 1 1-Dtchloroethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 102% 75-142 <br /> BSD ug/L 1000 110% 75-142 <br /> BSRPD ug/L 7 3% 518 7 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 999% 70-130 <br />' 12-Dichloroethane 524 2 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 902% 73-153 <br /> BSD ug1L 1000 103% 73-153 <br /> BSRPD ug/L 13 1% 523 6 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 869% 70 130 <br /> 1,1-Dichloroethylene 5242 09/20/2004 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 100% 56-163 <br /> BSD ug/L 1000 107% 56-163 <br /> BSRPD ug/L 6 5i%o 524 0 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 93 1% 70-130 <br />' cis-I 2 Dtchloroethylene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 71 4% 76-148 435 <br /> BSD ug/L 1000 910% 76-148 <br />' BSRPD ug/L 24 1% 530 2 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 728% 70-130 <br /> trans-1,2-Dtchloroethylene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 929% 82-133 <br /> BSD ug/L 1000 101% 82-133 <br /> BSRPD ug/L 86% s23 3 <br />' <br /> 5242 09/20/2004 A 00-CCV ug/L 10 00 88 1% 70-130 <br /> Dichloromethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 104% 77-144 <br /> BSD ug/L 1000 114% 77-144 <br />' BSRPD ug/L 94% 521 3 <br /> 524 2 09/20/2004 A 00-CCV ug/L 1000 103% 70-130 <br /> 1,2-Dichloropropane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK436507 Quality Control Page 4 <br />