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January 21, 2005 Lab ID STK438870 <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 524 2 12/30/2004 A209 BS ug/L 1000 82 9% 70-130 <br />' BSD ug/L 10 00 87 4% 70-130 <br /> 524 2 12/30/2004 A 00 CCV ug/L 1000 93 1% 70-130 <br />' Dichlorodifluoromethane 524 2 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ugJL 10 00 96 1% 47-143 <br /> BSD ugJL 1000 81 7% 47-143 <br /> BSRPD ug/L 162% 233 5 <br />' 524 2 12/30/2004 A 00-CCV ug/L 1000 156% 70-130 360 <br /> 1 1-Dtchloroethane 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 55 6% 48-170 <br />' BSD ug/L 1000 72 6% 48-170 <br /> BSRPD ugJL 265% 521 2 410 <br /> 5242 12/30/2004 A 00 CCV ug/L 1000 77 5% 70-130 <br /> I <br />' 1 2 Dwhloroethane 524 2 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 10 00 91 4% 60-160 <br /> BSD ug/L 1000 127% 60-160 <br /> BSRPD ug/L 32 8% 224 2 410 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 96 1% 70-130 <br /> 1 1-Dtchloroethylene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 562% 41-183 <br /> BSD ug/L 1000 699% 41-183 <br /> BSRPD ug/L 21 7% 519 3 410 <br /> 5242 12/30/2004 A 00 CCV ug/L 1000 115% 70 130 <br />' us 1 2-Dtchloroethylene 524 2 12/30/2004 A209 Blank ug/L ND <0 5 <br /> B$ ug/L 1000 66 7% 55-156 <br /> BSD ug/L 1000 89 2% 55-156 <br /> BSRPD ug/L 28 9% 226 8 410 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 754% 70-130 <br /> trans-1,2-Dtchloroethylene 524 2 12/30/2004 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 680% 42-177 <br /> BSD ugJL 1000 890% 42-177 <br /> BSRPD ug/L 26 7% 520 4 410 <br />' 524 2 12/30/2004 A 00-CCV ug/L 1000 74 3% 70 130 <br /> Dichloromethane 524 2 12/30/2004 A209 Blank ugJL ND <0 5 <br /> BS ug/L 1000 65 3% 62-161 <br /> BSD ugJL 1000 800% 62-161 <br />' BSRPD ugJL 20 2% 519 3 410 <br /> 524 2 12/30/2004 A 00-CCV ug/L 1000 746% 70-130 <br /> 1 2-Dtchloropropane 524 2 12/30/2004 A209 Blank ug/L ND <05 <br /> Report Continued on next page <br />' STK438870 Quality Control Page 4 <br />