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March 31, 2004 Lab ID STK431886 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Tnchloroethylene 5242 0123/2004 A209 BS ug/L 1000 92 8% 84-131 <br /> BSD ug/L 1000 978% 84-131 <br /> BSRPD ug/L 52% 515 9 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 906% 70-130 <br /> Trichlorofluoromethane 5242 03/23/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 134% 72-190 <br /> SSD ug/L 1 1000 119% 72-190 <br /> BSRPD ug/L 122% 521 3 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 165% 70-130 360 <br /> 1 2,3-Tnchloropropane 5242 031'_312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 109% 86-151 <br /> BSD ug/L 1000 111% 86-151 <br /> BSRPD ug/L 17% 5231 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 124% 70-130 <br /> 1 1 2-Trichloromfluoroethane 5242 0123/2004 A209 Blank uglL ND <05 <br /> B5 ug/L 1000 83 % 70-185 <br /> BSD ug/L 1000 814% <br /> 4% 70-185 <br /> BSRPD uglL 3 1 516 2 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 83 0% 70-130 <br /> 1,2 4-Trunethylbenzene 5242 03123!2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 117% 90-161 <br /> BSD ug/L 1000 116% 90-161 <br /> BSRPD ug/L 16% 530 0 <br /> 5242 03,13/2004 A 00-CCv ug/L 1000 118% 70-130 <br /> 1 3 5-Tnmethylbenzene 5242 03/23/2004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 128% 89-157 <br /> BSD ug/L 1000 122% 89-157 <br /> BSRPD ug/L 49% 516 2 <br /> 524 2 03/23/2004 A 00-CCV ug/L 1000 119% 70-130 <br /> Vinyl Chlonde 524 2 03,2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 1000 122% 77-171 <br /> BSD ug/L 1000 100% 77-171 <br /> BSRPD ug/L 199% 513 6 410 <br /> 5242 03/23/2004 A 00-CCV ug/L 1000 146% 70-130 360 <br /> Xylenes m p 5242 03,2312004 A209 Blank ug/L ND <05 <br /> BS ug/L 2000 117% 82-145 <br /> BSD ug/L 2000 106% 82-145 <br /> BSRPD ug/L 93% 518 0 <br /> 524 2 03/23/2004 A 00-CCV ug/L 21100 104% 70-130 <br /> . Explanations and definitions are continued on next p-tge <br /> STK431886 Quality Control Page 8 <br />