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1 <br /> September 28, 2004 Lab ID STK436510 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Conic QC Data DQO Note <br />' n-Butylbenzene 5242 09/20/2004 A209 BS ug/L 1000 834% 89-158 435 <br /> BSD ug/L 1000 83 1% 89-158 435 <br /> BSRPD ug/L 04% c 15 3 <br /> 524 2 09/20/2004 A 00-CCV ug/L 1000 854% 70-130 <br />' sec-Butylbenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 806% 92-147 435 <br /> BSD ug/L 1000 799% 92-147 435 <br />' BSRPD ug/L 08% 515 3 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 83 4% 70-130 <br /> tert-Buty[benzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 78 7=% 79-140 <br /> BSD ug/L 1000 797% 79-140 <br /> BSRPD ug/L 13% 515 8 <br />' <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 61 3% 70-130 <br /> Carbon Tetrachloride 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 103% 80-151 <br /> BSD ug/L 1000 108% 80-151 <br /> BSRPD ug/L 48% 520 6 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 102% 70-130 <br />' Chlorobenzene 524 2 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 645% 74-134 <br /> BSD ug/L 1000 87 9% 74-134 <br /> BSRPD ug/L 40% :!9 16 9 <br />' 524 2 09/20/2004 A 00-CCV ug/L 1000 85 0% 70-130 <br /> Chloroethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 101% 80-173 <br />' BSD ug/L 1000 998% 80-173 <br /> BSRPD ug/ 08% 516 1 <br /> 524 2 09/20/2004 A 00 CCV ug/L 1000 940% 70-130 <br />' Chloroform 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 94 1% 78-141 <br /> BSD ug/L 1000 I04% 78-141 <br /> BSRPD ug/L 10 1% 517 6 <br />' 5242 09/20/2004 A 00 CCV ug/L 1000 93 1% 70-130 <br /> Chloromethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 129% 68-165 <br />' BSD ug/L 1000 115% 68-165 <br /> BSRPD ug/L 116% 515 7 <br /> 524 2 09/20/2004 A 00 CCV ug/L 1000 103% 70-130 <br /> 2 Chlorotoluene 524 2 09/20/2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK436510 Quality Control Page 2 <br /> I <br />