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September 28, 2004 Lab ID STK436503 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method DatelID Type Units Conc. QC Data DQO Note <br /> 1 1,1,2-Tetrachloroethane 5242 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 I 2,2-Tetrachloroethane 524 2 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 94 8% 79-147 <br /> SSD 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% 71-136 <br /> BSD ug/L 1000 845% 71-136 <br /> BSRPD ug/L 25% 514 7 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 85 1% 70-130 <br /> IToluene 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 836% 78-126 <br /> B5D ug/L 1000 855% 78-126 <br /> BSRPD ug/L 2 3% 516 4 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 869% 70-130 <br /> 1 2,3-Trichlorobenzene 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 155% 525 4 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 108% 70-130 <br />' 1 2,4-Trichlorobenzene 5242 09/20/2004 A209 Blank ug/L ND <05 <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 /> I I 1 Trichloroethane 3242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> I 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 < <br /> g OS <br /> 13S 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 878% 70-130 <br /> Trichloroethylene 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> Report conitnued on next page <br /> STK436503 Quality Control Page 7 <br />