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I <br /> January 21, 2005 Lab ID STK438875 <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 1241 12/30/2004 A2119 BS ug/L 1000 112% 68-121 <br />' BSD ug/L 1000 134% 68-121 435 <br /> BSRPD ug/L 17 9% 517 5 410 <br /> 524 2 12/30/2004 A 00-CCV ug/L 1000 132% 70-130 360 <br />' 1 1 2 2 Tetrachloroethane 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS uglL 1000 68 5% 62-138 <br /> BSD ug/L 1000 88 6% 62-138 <br />' BSRPD ug/L 25 6% 526 9 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 82 4% 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 107% 520 7 <br />' <br /> 5242 12/30/2004 A 00-CCV ug/L 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 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 81 1% 64-152 <br /> BSD ug/L 1000 101% 64-152 <br /> BSRPD ug/L 215% 522 9 <br /> I524 2 12/30/2004 A 00-CCV ug/L 1000 101% 70-130 <br /> 1 2 4 Trtchlorobenzene 524 2 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 81 8% 67-140 <br />' BSD ug/L 1000 97 2% 67-140 <br /> BSRPD ug/L 17 3% 520 1 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 101% 70-130 <br />' 1,1 1-Trichloroethane 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 91 6% 63-145 <br /> BSD ug/L 1000 105% 63-145 <br /> BSRPD ug/L 137% 5 15 9 <br />' 524 2 12/30/2004 A 00-CCV ug/L 1000 984% 70-130 <br /> 1 1 2-Trlc.hloroethane 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 807% 63-131 <br /> BSD uglL 1000 103% 63-131 <br /> BSRPD ug/L 24 2% s25 5 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 91 9% 70-130 <br /> TrtLhloroethylene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK438875 Quality Control Page 7 <br />