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April 2$, 2004 Lab ID STK432106 <br /> Ground Zero Analysis Customer 3-14996 <br /> Quality Control - Organic <br /> Constituent Method Date/ID Type Units Cone QC Data DQO Note <br /> Methyl tert Butyl Ether (MTBE) 5242 04/12/2004 A209 BS ug/L 1000 119% 62-143 <br /> BSD ug/L 1000 132% 62-143 <br /> BSRPD ug/L 10 3% 517 6 j <br /> 5242 04/12/2004 A 00-CCV ug/L 1000 119% 70-130 <br /> Tert-amyl methyl Ether (TAME) 5242 04/12/2004 A209 Blank ug/L ND <3 <br /> BS ug/L 1000 65 6% 67-129 <br /> BSD ug/L 1000 97 4% 67-129 <br /> BSRPD ug/L 1 2 53 00 <br /> 5242 04/12/2004 A 00-CCV ug/L 1000 925% 70-130 <br /> Toluene 5242 04/12/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 1000 825% 78-126 <br /> BSD ug/L 1000 88 1% 78-126 <br /> BSRPD ug/L 66% 516 4 <br /> 5242 04/12/2004 A 00-CCV ug/L 1000 826% 70 130 <br /> Xylenes m p 5242 04/12/2004 A209 Blank ug/L ND <0 5 <br /> BS ug/L 2000 101% 82-145 <br /> BSD ug/L 2000 106% 82-145 <br /> BSRPD ug/L 49% 518 0 <br /> . 5242 04/12/2004 A 00-CCV ug/L 2000 100% 70-130 <br /> cert-Amyl methyl ether (TAME) 50303 04/01/2004 A233 Blank ug/L ND <2 <br /> 8260B 04/02/2004 A 00-CCV ug/L 1 5000 112% 50 150 <br /> Benzene 5030B 04/01/2004 A233 Blank ug/L ND <1 <br /> LCS ug/L 5000 91 0% 68-131 <br /> MS ug/L 50 00 93 1% 66 131 <br /> (STK432022-01) MSD ug/L 50 00 <br /> 992% 66 131 <br /> MSRPD ug/L 43% 514 6 <br /> 8260B 04/02/2004 A 00-CCV j ug/L 5000 103% 70-130 <br /> 4-Bromoftuorobenzene-Surrogate 5030B 04/01/2004 A233 Blank ug/L 25 00 102% 56-126 <br /> LCS ug/L 25 00 103% 56-126 <br /> MS ug/L 25 00 105% 56-126 <br /> (STK432022-01) MSD ug/L 25 00 104% 56-126 <br /> 8260E 04/02/2004 A 01-CCV ug/L 2500 103% 70-130 <br /> tert-Butanol 5030B 04/01/2004 A233 Blank ug/L ND <20 <br /> 8260B 04/02/2004 A 00-CCV ug/L 250 0 176% 50 150 360 <br /> Di-isopropyl ether (D1PE) 5030B 04/01/2004 A233 Blank ug/L ND <2 <br /> 8260B 04/02/2004 A 00-CCV ug/L 5000 118% 50 150 <br /> 1 2-Dtbromoethane (EDB) 5030B 04/01/2004 A233 Blank ug/L ND <1 <br /> Report continued on next page <br /> STK432106 Quality Control Page 2 <br />