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September 28, 2004 Lab ID STK436505 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Conc QC Data DQO Note <br /> Hecachlorobutadtene 5242 09/20/2004 A209 BS ug/L 1000 103% 73-154 <br />' BSD ug/L 1000 100% 73-154 <br /> BSRPD ug/L 2 8% 515 8 <br /> 524 2 09/20/2004 A 00-CCV ug/L 1000 108% 70-130 <br />' Isopropylbenzene 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 82 8% 88-143 435 <br /> BSD ug/L 1000 812% 88-143 435 <br />' BSRPD ug/L 19% 517 0 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 845% 70-130 <br /> p-Isopropy I toluene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br />' BS ug/L 1000 928% 88-153 <br /> BSD ug/L 1000 92 7% 88-153 <br /> BSRPD ug/L 01% 514 8 <br />' <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 944% 70-130 <br /> Methyl tett-Butyl Ether (MTBE) 5242 09/20/2004 A209 Blank ug/L ND <1 <br /> BS ug/L 1000 994% 62-143 <br /> BSD ug/L 1000 120% 62-143 <br /> BSRPD ug/L 190% 517 6 410 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 93 0% 70-130 <br /> Naphthalene 5242 09/20/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 115% 63-165 <br /> BSD ug/L 1000 143% 63-165 <br /> BSRPD ug/L 22 1% 530 6 r <br /> 524 2 09/20/2004 A 00-CCV ug/L 1000 107`70 70-130 <br /> n-Propylbenzene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 860% 85-152 <br /> I BSD ug/L 1000 857% 85-152 <br /> BSRPD ug/L 04% 515 6 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 879% 70-130 <br /> I Styrene 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 80 2% 85-149 435 <br /> BSD ug/L 10 00 88 5% 85-149 <br /> BSRPD ug/L 9 9% 516 8 <br /> 524 2 09/20/2004 A 00-CCV ug/L 1000 1 84 4% 70-130 <br /> Tert amyt methyl Ether (TAME) 524 2 09/20/2004 A209 Blank ug/L ND <3 ' <br /> BS ug/L 1000 $39% 67-129 <br /> BSD ug/L 1000 105% 67-129 <br /> BSRPD ug/L 22 53 00 <br /> 5242 09/20/2004 A 00-CCV ug/L 1000 840% 70-130 <br /> rl,1,1 2-`tetrachloroethane 5242 09/20/2004 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK436505 Quality Control Page 6 <br />