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. March 31, 2004 Lab ID STK431889 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Umts Conc. QC Data DQO Note <br /> 1,1,1,2-Tetrachloroethane 5242 03/28/2004 A209 BS ug/L 1000 785% 77-138 <br /> BSD ug/L 1000 694% 77-138 435 <br /> BSRPD ug/L 123% 515 8 <br /> 5242 03/28/2004 A 00-ccv ug/L 1000 749% 70-130 <br /> 13 2 2-Tetrachloroethane 5242 03/28/2004 A209 Bunk ug/L ND <05 <br /> BS ug/L 10 00 95 5% 79-147 <br /> BSD ug/L 1000 $06% 79-147 <br /> BSRPD ug/L 168% 525 9 <br /> 5242 03123 2004 A 00-ccv ug/L 1000 83 6% 70-130 <br /> Tetrachloroethylene 5242 03/28/1-004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 924% 71-136 <br /> BSD ug/L 1000 850% 71-136 <br /> BSRPD ug/L 8 3% 514 7 <br /> 5242 03/2S 2004 A 00-ccv ug/L 10 00 915% 70-130 <br /> Toluene 5242 03/232604 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 94 1% 78-126 <br /> BSD ug/L 1000 840% 78-126 <br /> BSRPD ug/L 113% 516 4 <br /> 5242 03125 2004 A 00-ccv ug/L 1000 906% 70-130 <br /> 1 2 3-Tnchlorobenzene 5242 0312312004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 945% 74-151 <br /> BSD ug/L 1000 870% 74-15I <br /> BSRPD ug/L 8 3% :525 4 <br /> 5242 03125 2004 A 00-ccv ug/L 1000 806% 70-130 <br /> 1 2 4-Tnchlorobenzene 5242 03/28/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 916% 74-152 <br /> BSD ug/L 1000 852% 74-152 <br /> BSRPD ug/L <br /> 72% 521 7 <br /> 5242 03/25 -004 A 00-ccv ug/L 1000 843% 70-I30 <br /> 1,1,1-Tnchloroethane 5242 0312312 04 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 103% 84-144 <br /> BSD ug/L 1000 905% 84-144 <br /> BSRFD ug/L 13 3% 517 8 <br /> 5242 03/25 2004 A 00-ccv ug/L 1000 106% 70-130 <br /> 1 1 2-Trichloroethane 5242 03/28/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 922% 80-132 <br /> SSD ug/L 1000 83 3% 80-132 <br /> BSRPD ug/L 10 I% 520 0 <br /> 5242 03123 2004 A 00-ccv ug/L 1000 81 7% 70-130 <br /> Tnchloroethvlene 5242 0312312004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK431889 Quality Control Page 7 <br />