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January 21, 2005 Lab ID STK438870 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Cone QC Data DQO Note <br /> 1,1,1 2-Tetrachloroethane 5242 12130!2004 A209 BS ug/L 1000 112% 68-121 <br /> 1 BSD ug/L 1000 134% 68-121 435 <br /> BSRPD ug/L 17 9% 517 5 410 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 132% 70-130 360 <br />' 1 1 2 2-Tetrachloroethane 524 2 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 685% 62-138 <br /> BSD ug/L 1000 88 6% 62-138 <br />' BSRPD ug/L 256% 526 9 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 824% 70-130 <br /> Tetrachloroethylene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 118% 62-116 435 <br /> BSD ug/L 10 00 131% 62-116 435 <br /> BSRPD ug/L 10 7% X20 7 <br />' 524 2 12/30/2004 A 00-CCV ug1L 1000 143% 70-130 360 <br /> Toluene 524 2 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 113% 59-124 <br /> BSD ug/L 1000 125% 59-124 435 <br /> BSRPD ug/L 104% s 17 9 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 135% 70-130 360 <br /> 1 2 3 Tnchlorobenzene 524 2 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 81 1% 64-152 <br /> BSD ug/L 1000 101% 64-152 <br /> BSRPD ug/L 21 5% :s�22 9 <br />' <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 101% 70-130 <br /> 1 2 4-Tr[chlorobenzene 524 2 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 81 8% 67-140 <br />' BSD ug/L 10 00 97 2% 67-140 <br /> BSRPD ug/L 17 3% 520 1 <br /> 524 2 12/30/2004 A 00-CCV ug/L 1000 101% 70-130 <br /> I 1 1 1-Trichloroethane 524 2 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 916% 63-145 <br /> BSD ug/L 1000 105% 63-145 <br /> BSRPD ug/L 13 7% 515 9 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 98 4% 70-130 <br /> 1,1 2-Trichloroethane 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 807% 63-131 <br />' BSD ug/L 10 00 103% 63-131 <br /> BSRPD ug/L 24 2% 525 5 <br /> 5242 12/30/2004 A 00-CCV ug/L 10 00 91 9% 70-130 <br /> Trichloroethylene 524 2 12/30!2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page, <br /> STK438870 Quality Control Page 7 <br />