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July 16, 2004 Lab ID SP 406529 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Conc QC Data DQO Note <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 /> 5242 07/07/2004 A 00-CCV ug/L 1000 98 2% 70-130 <br />' 1 1 2 2-Tetrachloroethane 5242 07/07/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 100% 79-147 <br /> BSD ug/L 1000 88 9% 79-147 <br />' BSRPD ug/L 119% 525 9 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 116% 70-130 <br />' Tetrachloroethylene 1242 07/07/2004 A2119 Blank uglL ND <0 5 <br /> BS ug/L 1000 86 1% 71-I36 <br /> BSD ug/L 1000 84 1% 71-136 <br /> BSRPD ug/L 25% 514 7 <br />' <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 925% 70-130 <br /> Toluene 5242 07/07/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 81 5% 78-126 <br /> BSD ug/L 1000 794% 78-126 <br /> BSRPD ug/L 2 6% S 16 4 <br /> 5242 07/07/2004 A 00 CCV ug/L 1000 905% 70-130 <br />' L 2 3-Trtchlorobenzene 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 121% 74-151 <br /> BSD ug/L 1000 112% 74-151 <br /> BSRPD ug/L 74% 525 4 <br /> I5242 07/07/2004 A 00 CCV ug/L 1000 131% 70-130 360 <br /> 1,2,4-Trichlorobenzene 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 112% 74-152 <br />' BSD ug/L 1000 104% 74-152 <br /> BSRPD ug/L 7 8% 1 521 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 <05 <br /> BS ug/L 1000 890% 84-144 <br /> BSD ug/L 1000 862% 84-144 <br /> BSRPD ug/L 32% 517 8 <br />' 5242 07/07/2004 A 00 CCV ug/L 1000 895% 70-130 <br /> 1 1 2-Trichloroethane 5242 07/07/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 963% 80-132 <br /> BSD ug/L 1000 84 8% 80-132 <br /> BSRPD ug/L 127% 520 0 <br /> 5242 07/07/2004 A 00-CCV ug/L 1000 915% 70-130 <br /> Tnchloroethylene 5242 07/0712004 A209 Blank ug/L ND <05 <br />' Report c.onttnued on next page <br /> SP 406529 Quality Control Page 7 <br /> I <br />