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September 28, 2004 Lab ID STK436509 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Conc 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% 515 3 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 85 4% 70-130 <br />' sec-Butylbenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 806% 92-I47 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 /> tern-Butylbenzene 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 1 3% 515 8 <br />' 524 2 09/20/2004 A 00-CCV ug/L 1000 81 3% 70-130 <br /> Carbon Tetrachloride 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 103% 80-151 <br /> BSD ug/L 1000 108% 80-151 <br /> BSRPD ug/L 4 8% .5206 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 102% 70-130 <br />' Chlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 845% 74-134 <br /> BSD ug/L 1000 87 9% 74-134 <br /> BSRPD ug/L 40% 516 9 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 850% 70-130 <br /> Chloroethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 101% 80-173 <br /> I BSD ug/L 1000 998% 80-173 <br /> BSRPD ug/L 08% 516 I <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 940% 70-130 <br />' Chloroform 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 94 1% 78-141 <br /> BSD ug/L 1000 104% 78-141 <br /> BSRPD ug/L 10 1% 5 17 6 <br /> 524 2 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 10 00 115% 68-165 <br /> BSRPD ug/L 116% 515 7 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 103% 70-130 <br /> 2 Chlorotoluene 5242 09/20/2004 A209 Blank ug/L I ND <0 5 <br /> Report continued on next page <br /> STK436509 Quality Control Page 2 <br />