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July 16, 2004 Lab ID SP 406527 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type UnitsConc. QC Data DQO t:e:l <br />' 1,1,1 2-Tetrachloroethane 5242 07/07/2004 A209 BS ug/L 1000 892% 77-138 <br /> BSD ug/L 1000 826% 77-138 <br /> BSRPD ug/L 77% 515 8 <br />' <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 982% 70-130 <br /> 1,1 2,2 Tetrachloroethane 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 100% 79-147 <br /> SSD ug/L 1000 88 9% 79-147 <br />' BSRPD ug/L 11 9% <25 9 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 116% 70-130 <br />' Tetrachloroethylene 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 86 1% 71-136 <br /> BSD ug/L 1000 84 1% 71-136 <br /> BSRPD ug/L 25% 514 7 <br />' 5242 07/07/2004 A 00-CCV ug/L 1000 925% 70-130 <br /> Toluene 524 2 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 81 5% 78-126 <br /> SSD ug/L 1000 794% 78-126 <br /> BSRPD ug/L 26% 516 4 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 905% 70-130 <br />' l 2,3-Tnchlorobenzene 5242 07/07/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 121% 74-151 <br /> BSD ug/L 1000 112% 74-151 <br /> BSRPD ug/L 74% 29254 <br />' 5242 07/07/2004 A 00-CCV ug/L 1000 131% 70-130 360 <br /> 1,2,4-Trtchlorobenzene 5242 07/07/2004 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 112% 74-152 <br /> BSD ug/L 1000 104% 74-152 <br /> BSRPD ug/L 78% 521 7 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 124% 70-130 <br />' 1,1,1-Tnchloroethane 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 890% 84-144 <br /> BSD ug/L 1000 862% 84-144 <br />' BSRPD ug/L 32% S178 <br /> 5242 07/07/2004 A 00-CCV ug/L 10 00 895% 70-130 <br /> 1,1,2-Trichloroethane 5242 07/07/2004 A209 Blank ug/L ND <05 <br />' BS ug/l. 1000 96 3% 80-132 <br /> BSD ug/L 1000 84 8% 80-132 <br /> BSRPD ug/L 127% 520 0 <br /> 524207/07/2004 A 00-CCV ug/L 1000 915% 70-130 <br /> Trichloroethylene 524 2 07/07/2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> SP 406527 Quality Control Page 7 <br />