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March 31, 2004 Lab ID STK431887 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Const><tuent Method Date/ID Type Units Conc QC Data DQO Note <br /> 1 2-âť‘LChlarohenzene-d4-5urrogate 5242 03/23/2004 A209 BS ug/L 1000 98 1% 70-130 <br /> SSD ug/L 1000 955% 70-130 <br /> 5242 03/23/2004 A 00-ccv ug/L 10 00 104% 70-130 <br /> Dtchlorodtfluoromethane 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 313% X164 410 <br /> 5242 03/23/2004 A 00-ccv ug/L 1000 976% 1 70-130 <br /> I,I-Dichloroethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 117% 75-142 <br /> BSD ug/L 1000 115% 75-142 <br /> BSRPD ug/L 1 1% 518 7 <br /> 5242 03/23/2004 A 00-ccv ug/L 1000 122% 70-130 <br /> 1,2-Dtchloroethane 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 108% 73-153 <br /> BSD ug/L 1000 110% 73-153 <br /> BSRPD ug/L 20% 523 6 <br /> 5242 03/23/2004 A 00-ccv ug/L 1000 128% 70-130 <br /> 1 1-Dtchloroethylene 5242 03,2312004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 102% 56-163 <br /> BSD ug/L 1000 94 8% 56-163 <br /> BSRPD Ug/L 75% 524 0 <br /> 524 2 03/23/2004 A 00-ccv ug/L 1000 10610 70-130 <br /> cis-I 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 877% 76-148 <br /> BSRPD ug/L 28% 5302 <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 <0 5 <br /> BS ug/L 1000 991% 82-133 <br /> BSD ug/L 1000 961% 82-I33 <br /> BSRPD ug/L 3 1% S23 3 <br /> 5242 03/23/2004 A 00-ccv ug/L 1000 103% 70-130 <br /> Dtchlorometltane 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 ug/L 07% 521 3 <br /> 5242 03/23/2004 A 00-ccv ug/L 1000 115% 70 130 <br /> 1 2 Dtchloropropane 5242 0123/2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK431887 Quality Control Page 4 <br />