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1 <br /> September 28, 2004 Lab ID STK436506 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Cone QC Data DQC Note <br />' I 1 1 2-Tetrachloroethane 1242 09/20/2004 A209 BS ug/L 1000 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 />' 1 1 2 2-Tetrachloroethane 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 948% 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 <05 <br />' BS ug/L 1000 86 6% 71-136 <br /> BSD ug/L 10 00 84 5% 71-136 <br /> BSRPD ug/L 25% 5 14 7 <br />' <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 85 1% 70-130 <br /> Toluene 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 83 6% 78-126 <br /> BSD ug/L 1000 85 5% 78-126 <br /> BSRPD ug/L 2 3% 516 4 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 869% 70-I30 j <br /> I <br />' 1 2 3-Trnchlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 115% 74-151 <br /> BSD ug/L 1000 134% 74-151 <br /> BSRPD ug/L 15 5% 525 4 <br />' 524 2 09/20/2004 A 00-CCV ug/L 10 00 108% 70-130 <br /> 1 2 4-Trtchlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 lit% 74-152 <br /> I 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 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 101% 84-144 <br /> BSA 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 /> I 1 2-Trichloroethane 5242 09/20/2004 A209 Blank ug/L IND <05 <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 09/20/2004A 00-CCV ug/L 1000 87 8% 70-130 <br /> IL Trichloroethylene 5242 09/20/2004 A20 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK436506 Quality Control Page 7 <br /> I <br />