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I <br /> January 21, 2005 Lab ID STK438873 <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 12/30/2004 A209 BS ug/L 1000 77 7% 59-143 <br /> BSD ug/L 1000 80 5% 59-143 <br /> BSRPD ug/L 35% t24 9 <br /> 524 2 12/30/2004 A 00-CCv ug/L 1000 91 8% 70-130 <br />' sec-Butylbenzene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 92 2% 57-146 <br /> BSD ug/L 1000 102% 57-146 <br />' BSRPD ug/L 1 <br /> 0 0% 524 2 <br /> 524 2 12/30/2004 A 00-CCv uglL 10 00 115% 70-130 <br /> tert-Butylbenzene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 10 00 1067c 63-124 <br /> BSD ug/L 1000 117% 63 124 <br /> BSRPD ug/L 10 5% 524 1 <br />' <br /> 5242 12/30/2004 A 00-CCv ug/L 1000 139% 70-130 360 <br /> Carbon Tetrachloride 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 10 00 98 3% 58-149 <br /> BSD ug/L 10 00 113`70 58-149 <br /> BSRPD ug/L 13 810 517 7 <br /> 524 2 12/30/2004 A 00 CCv ug/L 1000 112% 70 130 <br /> Chlorobenzene 524 2 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 144% 64-119 435 <br /> BSD ug/L 10 00 161% 64-119 435 <br /> BSRPD ug/L 11 1% 517 9 <br />' <br /> 5242 12/30/2004 A 00 CCv ug/L 10 00 166% 70-130 360 <br /> Chloroethane 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 909% 49 170 <br /> BSD ug/L 1000 86 5% 49-170 <br /> BSRPD ug/L 49% 522 4 <br /> 5242 12/30/2004 A 00-CCv ug/L 1000 141% 70-130 360 <br />' Chloroform 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 623% 73-136 435 <br /> BSD ug/L 1000 84 8% 73-136 <br /> BSRPD ug/L 307% 520 3 410 <br />' 5242 12/30/2004 A 00-CCv ug/L 1000 718% 70-130 <br /> Chloromethane 5242 I2/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 10 00 699% 37-171 <br />' BSD ug/L 10 00 a9 8% 37-171 <br /> BSRPD ug/L 15 6% 535 9 <br /> 5242 12/30/2004 A 00 CCv ug/L 1000 111% 70 130 <br /> 2 Chlorotoluene 5242 12/30/2004 A209 BI Ink ug/L ND <0 5 <br /> Report connnued on next page <br /> STK438873 Quality Control Page 2 <br />