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* 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 Data DQO Note <br /> 1 2-Dichlorobenzene-d4-Surrogate 5242 03/212004 A209 BS ug/L 1000 98 1% 70-130 <br /> BSD ug/L 1000 95 5% 70-130 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 104% 70-130 <br /> Dichlorodifluoromethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 71 8% 32-250 <br /> BSD ug/L 1000 524% 32-250 <br /> BSRPD ug/L 31 3% 516 4 410 <br /> 5242 03/2312004 A 00-CCV ug/L 1000 976% 70-130 <br /> 1,I-Dichloroethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 117% 75-I42 <br /> BSD ug/L 1000 115% 75-142 <br /> BSRPD ug/L 1 1% 518 7 <br /> 5242 031212004 A 00-CCV ug/L 1000 122% 70-130 <br /> 1 2-Dichloroethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 108% 73-153 <br /> BSD ug/L 1000 210% 73-153 <br /> BSRPD ug/L 2 0°k 523 6 <br /> 5242 03/2312004 A 00-CCV ug/L 1000 128% 70-130 <br /> 1,1-Dichloroethylene 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 102% 56-163 <br /> BSD ug/L 1000 94 8% 56-I63 <br /> BSRPD ug/L 75% 524 0 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 106% 70-130 <br /> cis-1 2-Dichloroethylene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 85 1% 76-148 <br /> BSD ug/L 1000 87 7% 76-148 <br /> BSRPD ug/L 28% :5 30 2 <br /> 5242 03/23!2004 A 00-CCV ug/L 1000 979% 70-130 <br /> trans-1,2-Dichloroethylene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 99 1% 82-133 <br /> BSD ug/L 1000 96 1% 82-133 <br /> BSRPD ug/L 3 1% 523 3 <br /> 524 2 03/23/2004 A 00 CCV ug/L 1000 103% 70-I30 <br /> Dichloromethane 524 2 03/23,2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 102% 77-144 <br /> BSD ug/L 1000 101% 77-144 <br /> BSRPD ug1L 07% 521 3 <br /> 524 2 03/23/2004 A 00-CCV ug/L 1000 115% 1 70-130 <br /> 1 2 Dichloropropane 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> Report connnued on next page <br /> STK431888 Quality Control Page 4 <br />