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July 16, 2004 Lab ID SP 406528 <br /> Ground Zero Analysis Customer 3-14996 i <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Cone QC Data DQO Note <br /> n-Butylbenzene 5242 07/07/2004 A209 BS ug/L 1000 964% 89-158 <br /> BSD ug/L 1000 94 2% 89-158 <br /> BSRPD ug/L 23% :5 15 3 <br />' <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 113% 70-130 <br /> sec-Butylbenzene 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 920% 92-147 <br /> BSD ug/L 1000 880% 92-147 435 <br />' 13SRPD ug/L 45% 515 3 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 113% 70-130 <br />' tert-Butvlbenzene 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 95 3% 79-140 <br /> BSD ug/L 1000 994% 79-140 <br /> BSRPD ug/L 65% <_15 8 <br />' <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 112% 70-130 <br /> Carbon Tetrachloride 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 908% 80-151 <br /> BSD ug/L 1000 4 520 6 4 7a < <br /> BSRPD ug/L 4 9% 20 6 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 903% 70-130 <br />' Chlorobenzene 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 82 8% 74-134 <br /> BSD ug/L 1000 784% 74-134 <br /> BSRPD ug/L 5 5% 516 9 <br />' 5242 07!07/2004 A 00-CCV ug/L 1000 901% 70-130 <br /> Chloroethane 5242 07/07/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 967% 80-173 <br />' BSD ug/L 1000 90 1% 80-173 <br /> BSRPD ug/L 70% 516 1 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 964% 70-130 <br />' Chloroform 5242 07/07/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 107% 78-141 <br /> BSD ug/L 1000 959% 78-141 <br /> BSRPD ug/L 106% 517 6 <br />' 5242 07/07/2004 A 00-CCV ug/L 1000 104% 70-130 <br /> Chloromethane 524 2 07/07/2004 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 93 5% 68-165 <br /> BSD ug/L 1000 85 8% 68-165 <br /> BSRPD ug/I- 8 6% 515 7 <br /> 524 2 07/07/2004 A 00-CCV ug/L 1000 909% 70-130 <br /> 2-Chlorotoluene 5242 07/07/2004 A209 Blank ug/L ND <05 <br />' Report continued on next page <br /> SF 406528 Quality Control Page 2 <br />