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July 16, 2004 Lab ID SP 406523 <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 07/02/2004 A209 BS ug/L 1000 946% 77-138 <br /> BSD ug/L 1000 797% 77-138 <br /> BSRPD ug/L 17 1% 515 8 410 <br />' <br /> 5242 07/02/2004 A 00 CCV ug/L 1000 97 7% 70-130 <br /> 1 1,2,2-Tetrachloroethane 5242 07/02/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 108% 79-147 <br /> BSD ug/L 1000 77 1% 79-147 435 <br />' BSRPD ug/L 32 9% 525 9 410 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 104% 70-130 <br /> Tetrachloroethylene 5242 07/02/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 874% 71-136 <br /> SSD ug/L 1000 104% 71-136 <br /> BSRPD ug/L 169% 514 7 410 <br />' 5242 07/02/2004 A 00-CCV ug/L 1000 910% 70-130 <br /> Toluene 5242 07/02/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 869% 78-126 <br /> BSD ug/L 1000 943% 78-126 9 164 <br /> BSRPD ug/L 83% S 16 4 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 90 1% 70-130 <br />' 1,2,3-Tnchlorobenzene 5242 07/02/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 128% 74-151 <br /> BSD ug/L 1000 104% 74-151 <br /> BSRPD ug/L 20 1% 525 4 <br />' 5242 07/02/2004 A 00-CCV ug/L 1000 123% 70-130 <br /> 1,2,4-Trtchlorobenzene 5242 07/02/2004 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 117% 74-152 <br /> BSD ug/L 1000 989% 74-152 <br /> BSRPD ug/L 172% X21 7 <br /> 5242 07/0212004 A 00-CCV ug/L 1000 117% 70-130 <br />' 1,1,1 Trichloroethane 524 2 07/02/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 906% 84-144 <br /> BSD ug/L 1000 101% 84-144 <br />' BSRPD ug/L 104% 517 8 <br /> 5242 07/02/2004 A 00-CCV ug/L 1000 923% 70-130 <br /> 1,1,2-Trichloroethane 5242 07/02/2004 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 103% 80-132 <br /> BSD ug/L 1000 766% 80-132 435 <br /> BSRPD ug/L 29 1% 520 0 410 <br /> 524 2 07/02/2044 A 00-CCV ug/L 1000 966% 70-130 <br /> Trichloroethylene 5242 07/02/2004 A209 Blank ug/L ND <05 <br /> Report continued on next page <br /> SP 406523 Quality Control Page 7 <br /> 1 <br />