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i March 31, 2004 Lab ID STK431888 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Conc. QC LiiEteNote <br /> 11,1,2-Tetrachloroethane 524 2 03/23/2004 A209 BS ug/L 1000 987% 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-I30 <br /> 1 1,2 2-Tetrachloroethane 524 2 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 102% 79-147 <br /> SSD ug/L 1000 968% 79-147 <br /> BSRPD ug/L 49% 525 9 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 113% 70-130 <br /> Tetrachloroethylene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 91 1% 7I-136 <br /> BSD ug/L 1000 85 1% 71-136 <br /> BSRPD ug/L 68% 514 7 <br /> 524 2 03/23/2004 A 00-CCV ug/L 1000 802% 70-I30 <br /> Toluene 524 2 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 99 8% 78-126 <br /> . BSD ug/L 1000 92 9% 78-126 <br /> BSRPD ug/L 7 1% <_16 4 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 936% 70-130 <br /> 1 2 3-Tnchlorobenzene 5242 03t2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 98 3% 74-151 <br /> BSD ug/L 1000 974% 74-151 <br /> BSRPD ug/L 09% 525 4 <br /> 524 2 03123/2004 A 00-CCV ug/L 1000 108% 70-130 <br /> 1,2,4-Tnchlorobenzene 524 2 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 101% 74-152 <br /> BSD ug/L 1000 960% 74-152 <br /> BSRPD ug/L 52% 521 7 <br /> 5242 03/23!2004 A 00-CCV ug/L 1000 105% 70-I30 <br /> I,1 1-Trichloroethane 524 2 0323/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 101% 84-144 <br /> BSD ug/L 1000 108% 84-144 <br /> BSRPD ug/L 7 1% 517 8 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 105% 70-130 <br /> 1 1 2-Trichloroethane 5242 0323/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 88 2% 80-132 <br /> BSD ug/L 1000 918% 80-132 <br /> BSRPD ug/L 40% 520 0 <br /> 5242 03/23/2004 A 00 CCV ug/L 1000 958% 70-130 <br /> Tnchloroethvlene 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK431888 Quality Control Page 7 <br />