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1 <br /> . March 30, 2005 Lab ID STK531972 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent liethod Date/ID Type I Units Conc QC Data DQONote <br /> Hexachlorobutadtene 5242 03/23/2005 A209 BS ug/L 1000 122% 57-145 <br />' BSD ug/L 1000 109% 57-148 <br /> BSRPD ug/L 11 1% 524 4 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 11970 70-130 <br />' Isopropylbenzene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 101% 66-129 <br /> BSD ug/L 1000 94 6% 66-129 <br /> BSRPD ug/L 65% 521 0 <br /> 5242 03/23/2005 A 00-cCV ug/L 1000 101% 1 70-130 <br /> p-Isopropy[toluene 5242 03/23/2005 A209 Blank ug/L ND <05 <br />' BS ug/L 1000 1051% 66-134 <br /> BSD ug/L 1000 95 3% 66-134 <br /> BSRPD ug/L 94% 524 0 <br />' <br /> 5242 03/23/2005 A 00-cCV ug/L 1000 107% 70-130 <br /> Methyl tert-Butyl Ether (MTBE) 524 2 03/23/2005 A209 Blank ug/L ND <1 <br /> BS ug/L 1000 106% 51-166 <br /> BSD ug/L 1000 90 9510 51-166 <br /> BSRPD ug/L 15 11. s36 4 <br /> 5242 03/23/2005 A 00-CCV ug/L 1000 902% 70-130 <br /> Naphthalene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 14017o 54-156 <br /> BSD ug/L 1000 117% 54-156 <br /> BSRPD ug/L 177% 152S 1 <br /> 524 2 03/23/2005 A 00-CCV ug/L 1000 101% 70-130 <br /> n-Propylbenzene 5242 03/23/2005 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 106% 63-134 <br /> BSD ug/L 1000 98 9% 63-134 <br /> BSRPD ug/L 7 30 522 5 <br /> 5242 03/23/2005 A 00-CCV ug/L 10 00 102% 70-130 <br />' Styrene 5242 03/23/2005 A209 Blank ug/L ND <0 5 <br /> BS ug/L 10 00 121% 69-123 <br /> BSD ug/L 1000 106% 69-123 <br /> BSRPD ug/L 13 1% 517 6 <br /> 5242 03/23/2005 A 00-CCV ug/L 10 00 115% 70-130 <br /> Tert amyl-methyl Ether (TAME) 5242 03/23/2005 A209 Blank ug/L ND <3 <br /> BS ug/L 10 00 110% 52-142 <br /> BSD ug/L 10 00 95 0% 52-142 <br /> BSRPD ug/L 1 5 53 00 <br /> 5242 03/23/2005 A 00 CCV ug/L 10 00 970% 70-130 <br />' 1 I 1 2-Tetrachloroethane 524 2 03/23/2005 A209 Blank ug/L ND <0 5 <br /> Report continued on next page <br /> STK531972 Quality Control Paue 6 <br />