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September 28, 2004 Lab ID STK436504 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/LD Type Units Cone QC Data DQO Note <br /> 1 1,1 2-Tetrachloroethane 1241 09/20/2004 A209 BS ug/L 11101 93 0% 77-138 <br />' BSD ug/L 1000 103% 77-138 <br /> BSRPD ug/L 104% 515 8 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 969% 70-130 <br /> t 1 1 2,2-Tetrachloroethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 94 8% 79-147 <br /> BSD ug/L 1000 105% 79-147 <br /> BSRPD ug/L 99% 525 9 <br />' 5242 09/20/2004 A 00-CCV ug/L 1000 972% 70 130 <br /> Tetrachloroethylene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 866% 7I-136 <br /> BSD ug/L 1000 845% 71-136 <br /> BSRPD ug/L 25% !E�14 7 <br /> 524 2 09/20/2004 A 00-CCV ug/L 1000 85 1% 70-130 <br />' Toluene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 83 6% 78-126 <br /> BSD ug/L 1000 85 5% 78-126 <br /> BSRPD ug/L 23% 516 4 <br /> 5242 09/20/2004 A 00 CCV ug/L 1000 869% 70-130 <br /> 1 2 3-Trtchlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 115% 74-151 <br /> BSD ug/L 1000 134% 74-151 <br /> BSRPD ug/L 15 5% i5254 <br />' <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 108% 70-130 <br /> 1 2 4-Tnchlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 111% 74-152 <br /> BSD ug/L 1000 123% 74-152 <br /> BSRPD ug/L 108% 521 7 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 105% 70-130 <br />' 1 1 1-Trichloroethane 5242 09/2012004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 101% 84-144 <br /> BSD ug/L 1000 105% 84-144 <br /> BSRPD ug/L 3 8% 517 8 <br />' 5242 09/20/2004 A 00-CCV ug/L 1000 101% 70-130 <br /> 1 1 2-Trichloroethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 879% 80-132 <br /> BSD ug/L 1000 104% 80-132 <br /> BSRPD ug/L 169% 520 0 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 171% 70-130 <br /> Tm-hloroethylene 524 2 09/20/2004 A209 Blank ug/L ND j <0 5 <br /> Report continued on next page <br /> STK436504 Quality Control Page 7 <br />