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April 01, 2004 Lab ID STK431883 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br /> n-Butylbenzene 5242 03/23/2004 A209 BS ug/L 1000 126% 89-158 <br /> BSD ug/L 1000 117% 89-158 <br /> BSRPD ug/L 70% 515 3 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 112% 70-130 <br /> sec-Butylbenzene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 130% 92-147 <br /> BSD ug/L 1000 125% 92-147 <br /> BSRPD ug/L 3 8% 515 3 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 120% 70-130 <br /> tert-Butylbenzene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS us/L 10 00 111% 79-140 <br /> BSD ug/L 1000 101% 79-140 <br /> BSRPD u,-/L 91% 515 8 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 104% 70-130 <br /> Carbon Tetrachlgnde 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS us/L 1000 98 7% 80-151 <br /> BSD ug/L 1000 103% 80-151 <br /> BSRPD ug/L 42% 520 6 <br /> 5242 03/23/2004 A 00-CCV ug/L l0 00 100% 70-130 <br /> Chlorobenzene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 967% 74-134 <br /> SSD ug/L 1000 93 5% 74-134 <br /> BSRPD u.-IL 3 3% S16 9 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 93 1% 70-130 <br /> Chloroethane 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 142% 80-173 <br /> BSD ug/L 1000 121% 80-173 <br /> BSRPD ug/L 154% 516 1 <br /> 5242 03/23/2004 A 00 CCV u,-/L 10 00 164% 70-130 360 <br /> Chloroform 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 101% 78-141 <br /> BSD ug/L 1000 105% 78-141 <br /> BSRPD ug/L 3 9% 517 6 <br /> 5242 03/23/2004 A 00-CCV uglL 1000 106% 70-130 <br /> Chloromethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 95 2% 68-165 <br /> BSD u,-/L 1000 746% 68-165 <br /> BSRPD u,-/L 243% 515 7 410 <br /> 524 2 03/23/2004 A 00-CCV ug/L 1000 1I7% 70-130 <br /> 2-Chlorotoluene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> Report continued on next page <br /> STK431883 Quality Control Page 2 <br />