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March 30, 2005 Lab ID STK531970 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' E: Constituent Method Date/ID Type Units Conic QC Data DQO Note <br /> n-Butylbenzene 5242 03/23/2005 A209 BS ug/L 10 00 107% 59-143 <br /> BSD uglL 10 00 967% 59-143 <br /> BSRPD ug/L 103% 524 9 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 107% 70-130 <br />' sec-Butylbenzene 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 100% 57-146 <br /> BSD ug/L 1000 94 7% 57-146 <br />' BSRPD ug/L 5 9% 524 2 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 98 010 70-130 <br /> cert-Buty]benzene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 103% 63-124 <br /> BSD ug/L 10 00 100% 63-124 <br /> BSRPD ug/L 3 1% 524 1 <br />' 524 2 03/23/2005 A 00-CCV ug/L 10 00 104% 170-130 <br /> Carbon Tetrachloride 524 2 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 926% 58-149 <br /> BSD ug/L 1000 95 2% 58-149 <br /> 10 <br /> BSRPD ug/L 28% 517 7 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 95 1% 70-130 <br /> Chlorobenzene 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 123% 64-119 435 <br /> BSD ug/L 10 00 107% 64-119 <br /> BSRPD ug/L 13 8% 517 9 <br /> 5242 03/23/2005 A 00-CCV ug/L 10 00 112% 70-130 <br /> Chloroethane 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 so 8% 49-170 <br />' BSD ug/L 1000 779% 49-170 <br /> BSRPD ug/L 3 77v 522 4 <br /> 5242 03/23/2005 A 00-CCV ug/L 10 00 110% 70-130 <br />' Chloroform 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 112% 73-136 <br /> BSD ug/L 1000 104% 73-136 <br /> BSRPD ug/L 7 5% 520 3 <br />' 524 2 03/23/2005 A 00-CCV ug/L 10 00 106% 70-130 <br /> Chloromethane 524 2 03/23/2005 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 827% 37-171 <br /> BSD ug/L 1000 75 3% 37-171 <br /> BSRPD ug/L 94% 535 9 <br /> 524 2 03/23/2005 A 00-CCV ug/L 1000 116% 70-130 <br />' 2 Chlorotoluene 524 2 03/23/2005 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK531970 Quality Control Page 2 <br />