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March 31 2004 Lab ID STK431886 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Conc QC Data DQO TNote <br /> 1,1 1 2-Tetrachloroerhane 5242 03/23/2004 A209 BS ug/L 1000 98 7% 77-138 <br /> BSD ug/L 1000 975% 77-138 <br /> BSRPD ug/L 12% 515 8 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 105% 70-130 <br /> 1 1 2,2-Tetrachloroethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 102% 79-147 <br /> BSD ug/L 1000 968% 79-147 <br /> BSRPD ug/L 49% 525 9 <br /> 5242 03/23/2004 A 00-CCV ug/L 10 00 113% 70-130 <br /> Tetrachloroethylene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 91 1% 71-136 <br /> BSD ug/L 1000 85 1% 71-136 <br /> BSRPD ug/L 68% 514 7 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 802% 70-130 <br /> Toluene 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 99 8% 78-126 <br /> BSD ug/L 1000 929% 78-126 <br /> BSRPD ug/L 7 1% 516 4 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 93 6% 70-130 <br /> 1 2 3-Tnchlorobenzene 5242 03,23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 983% 74-151 <br /> BSD ug/L 1000 974% 74-151 <br /> BSRPD ug/L 09% -.9254 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 108% 70-130 <br /> 1 2 4-Tnchlorobenzene 5242 03/33/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 101% 74-152 <br /> BSD ug/L 1000 960% 74-152 <br /> SSRPD ug/L 52% 521 7 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 105% 70-130 <br /> 1 I 1-Trichloroethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 101% 84-144 <br /> BSD ug/L 1000 108% 84-144 <br /> BSRPD ug/L 71% 517 8 <br /> 5242 03/23/2004 A 00 ccV ug/L 1000 105% 70-130 <br /> 1 1 2-Trichloroethane 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 882% 80-132 <br /> SSD ug/L 1000 91 8% 80-132 <br /> BSRPD ug/L 40% 29200 <br /> 524 2 03123/2004 A 00 CCV ug/L 1000 95 8% 70-130 <br /> TnLhloroethylene 524 2 03/23/2004 A209 Blank ug/L ND <05 <br /> Report continued on next page <br /> STK431886 Quality Control Page 7 <br />