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January 21, 2005 Lab ID STK438875 <br />' Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br />' Constituent Method Date/ID Type Units Cone QC Data DQO Note <br />' n-Bu ylbenzene 5242 12/30/2004 A209 BS ug/L 1000 77 7% 59-143 <br /> BSD ug/L 1000 8050. 59-143 <br /> BSRPD ug/L 3 5% 5 24 9 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 91 8% 70-130 <br />' sec-Butylbenzene 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 922% 57-146 <br /> BSD ug/L 1000 1020 57-146 <br />' BSRPD ug/L 100% 524 2 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 115% 70-130 <br /> tert-Buty[benzene 5242 12/30/2004 A209 Blank Ug/ ND <05 <br />' BS ug/L 1000 106% 63-124 <br /> BSD ug/L 1000 117% 63-124 <br /> BSRPD ug/L 105% 524 1 <br />' <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 139% 70-130 360 <br /> Carbon Tetrachloride 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 98 3 o 58-149 <br /> BSD ug/L 1000 113` 58-149 <br /> BSRPD ug/L 13 81. 17 7 <br /> 5242 12/30/2004 A 00 CCV ug/L 10 00 112% 70-130 <br /> Chlorobenzene 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 144% 64-119 435 <br /> BSD ug/L 1000 161% 64-119 435 <br /> BSRPD ug/L 11 1% 5 17 9 <br />' 5242 12/3012004 A 00-CCV ug/L 1000 166% 70-130 360 <br /> Chloroethane 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 90 9% 49-170 <br /> I BSB ug/L 1000 86 5% 49-170 <br /> BSRPD ug/L 4 9`5 c22 4 <br /> 5242 12/3012004 A 00-CCV ug/L 1000 141% 70-130 300 <br /> Chloroform 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 62 31v 73-136 435 <br /> BSD ug/L 1000 84 8% 73-136 <br /> BSRPD ug/L 307% 520 3 410 <br /> I5242 12/30/2004 A 00-CCV ug/L 1000 71 8% 70-130 <br /> Chloromethane 5242 12/30/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 69 9% 37-171 <br /> BSD uglL 1000 59 81 37-171 <br /> BSRPD ug/L 15 6`h 535 9 <br /> 524 2 12/30/2004 A 00 CCV ug/L 1000 111 o 70-130 <br /> 2 Chlororuluene 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> Report fonunued on next page <br /> STK438875 Quality Control Page 2 <br />