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July 16, 2004 Lab ID SP 406525 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Cone QC Data DQO Note <br /> n-Butylbenzene 5242 07/02/2004 A209 BS ug/L 1000 94 2% 89-158 <br />' BSD ug/L 1000 115% 89-158 <br /> BSRPD ug/L 19 6% 515 3 410 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 103% 70-130 <br /> sec-Butylbenzene 5242 07!02/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 927% 92-147 i <br /> BSD ug/L 1000 108% 92-147 <br />' BSRPD ug/L 15 4%b 515 3 410 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 104% 70-130 <br /> Cert-Butylbenzene 5242 07/02/2004 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 97 1% 79-140 <br /> BSD ug/L 1000 109% 79-140 <br /> BSRPD ug/L 11 7% 515 8 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 102% 70-130 <br /> Carbon Tetrachloride 524 2 07/02/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 864% 80-151 <br /> BSD ug/L 10 00 105% 80-151 <br /> BSRPD ug/L 190% 520 6 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 929% 70-130 <br /> Chlorobenzene 5242 07/02/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 882% 74-I34 <br /> BSD ug/L 1000 88 0% 74-134 <br /> BSRPD ug/L 0 3% 516 9 <br />' 524 2 07/02/2004 A 00-CCV ug/L 1000 91 1% 70-130 <br /> Chloroethane 5242 07/02/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 89 9% 80-173 <br />' BSD ug/L 1000 106% 80-173 <br /> BSRPD ug/L 167% :516 1 410 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 85 9% 70-130 <br />' Chloroform 5242 07/02/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 106% 78-141 <br /> BSD ug/L 1000 91 0% 78-141 <br /> BSRPD ug/L 15 6% 517 6 <br />' 5242 07/02/2004 A 00-CCV ug/L 1000 103% 70-130 <br /> Chloromethane 5242 07/02/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 925% 68-165 <br />' BSD ug/L 1000 117% 68-165 <br /> BSRPD ug/L 23 2% 515 7 410 <br /> 524 2 07/02/2004 A 00-CCV ug/L 1000 835% 70-130 <br /> 2-Chlorotoluene 5242 07/02/2004 A209 Blank ug/L ND <05 <br /> Report continued on next page <br /> SP 406525 Quality Control Page 2 <br />