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• March 31, 2004 Lab ID STK431889 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID TypeUnits Conc Q C Data DQ O Note <br /> n-Butylbenzene 5242 03123,2004 A209 BS ug/L 1000 949% 89-158 <br /> BSD ug/L 1000 83 8% 89-158 435 <br /> BSRPD ug/L 124% 515 3 <br /> 5242 0312&2004 A 00-CCV ug/L 1000 975% 70-130 <br /> sec-Butylbeazene 5242 03128!2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 116% 92-147 <br /> BSD ug/L 1000 100% 92-147 <br /> BSRPD ug/L 144% 515 3 <br /> 5242 03/28,'2004 A 00-CCV ug/L 1000 117% 70-130 <br /> tert-Butylbenzene 5242 03/2812004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 943% 79-140 <br /> BSD ug/L 1000 85 3% 79-140 <br /> BSRPD ug/L 100% 515 8 <br /> 5242 03/25 2004 A 00-CCV ug/L 1000 940% 70-130 <br /> Carbon Tetrachloride 5242 03,28 1-004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 103% 80-151 <br /> • BSD ug/L 1000 893% 80-151 <br /> BSRPD ug/L 140% 520 6 <br /> 5242 03/25 2004 A 00-CCV ug/L 1000 112% 70-130 <br /> Chlorobenzene 5242 03138;2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 942% 74-134 <br /> BSD ug/L 1000 87 9% 74-134 <br /> BSRPD ug/L 69% .5169 <br /> 5242 03 2S12004 A 00-CCV ug/L 1000 907% 70-130 <br /> Chloroethane 5242 03,2S/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 95 2% 80-173 <br /> BSD ug/L 1000 821% 80-173 <br /> BSRPD ug/L 14 8% 516 1 <br /> 5242 03/2812004 A 00-CCV ug/L 1000 83 I% 70-130 <br /> Chloroform 5242 03/28/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 102% 78-141 <br /> BSD ug/L 1000 87 1% 78-141 <br /> BSRPD ug/L 16 1% 517 6 <br /> 5242 03/25,2004 A 00-CCV ug/L 1000 987% 70-130 <br /> Chloromethane 5242 03/231200-1 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 917% 68-165 <br /> BSD ug/L 1000 817% 68-165 <br /> BSRPD ug/L 116% 515 7 <br /> 5242 03,'-S ''004 A 00-CCV ug/L 1000 760% 70-130 <br /> 2-Chlorotoluene 5242 0. 2S 2004 A209 Blank ug/L ND <05 <br /> Report continued on next page <br /> STK431889 Quality Controf Page 2 <br />