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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 /> 2-Chlorotoluene 5242 12/30/2004 A209 BS ug/L 1000 82 7% 64-131 <br />' BSDug/L 1000 920% 64-131 <br /> BSRPD ug/L 10 6% s21 6 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 103% 70-130 <br />' 4 Chlorotoluene 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 83 5% 67-129 <br /> BSD ug/L 1000 94 9% 67-129 <br /> BSRPD ug/L 12 7% 520 2 <br />' 524 2 12/30/2004 A 00-CCV ug/L 10 00 103% 70-130 <br /> Di-isopropyl ether (DIPE) 5242 12/30/2004 A209 Blank ug/L ND <3 <br />' BS ug/L 1000 55 6% 54-152 <br /> BSD ug/L 1000 70 1% 54 152 <br /> BSRPD ug/L 1 5 53 00 <br /> 524 2 12/30/2004 A 00-CCV ug/L 1000 710% 70-130 <br />' Dibromochloromethane 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 970% 70-128 <br /> BSD ug/L 10 00 121% 70-128 <br /> BSRPD ug/L 22 4% 2522 8 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 109% 70 130 <br /> Dtbrornomethane 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 88 5% 70-134 <br /> BSD ug/L 1000 122% 70-134 <br /> BSRPD ug/L 318% 5261 410 <br />' <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 96 7% 70-130 <br /> 1 2-Dichlorobenzene 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 86 9% 67 133 <br /> BSD ug/L 1000 98 9% 67-133 <br />' BSRPD ug/L 12 9% 519 8 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 104` 70-130 <br /> I 1 3 Dichlorobenzene 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 10 00 89 3% 68-125 <br /> BSD ug/L 10 00 98 8% 68-125 <br /> BSRPD uglL 10 1% 5 19 0 <br /> 5242 12/30/2004 A 00-CCV ug/L 1000 109% 70-130 <br /> 1 4 Dichlorobenzene 5242 12/30/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 90 1% 65-132 <br /> SSD ug/L 1000 105% 65-132 <br /> BSRPD ug/L 15 5% 5202 <br /> 524 2 12/30/2004 A 00 CCV ug/L 10 00 107% 70-130 <br /> 1 2 DichlorobLnzeni d4 Surrogate 5242 12/30/2004 A209 Blank ug/L 1000 72 9% 70-I30 <br /> Report continued on next page <br /> STK438870 Quality Control Page 3 <br />