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A <br /> Quality Assurance Report <br /> MTBE by GUMS in Water <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch B000966-EPA 5030 GC/MS <br /> Blank B000966-BLK1 Prepared&Analyzed 04/27/06 <br /> Methyl tert-Butyl Ether (MTBE) ND 1 0 µgll- <br /> Surrogate Dibromofluoromethane 171 µg/L 200 86 70-130 <br /> Surrogate Toluene-d8 178 lig/L 200 89 70-130 <br /> Surrogate 4-Bromofluorobenzene 192 ug/L 200 96 70-130 <br /> Matrix Spike B000966-MSI Source 6042612-01 Prepared&Analyzed 04/27/06 <br /> 1,1-Dichloroethene(l,l-DCE) 190 10 µg/L 250 ND 76 70-130 <br /> Benzene 21 6 1 0 lig/L 250 ND 86 70-130 <br /> Trichloroethene(TCE) 21 1 1 0 lag/L 250 ND 84 70-130 <br /> Toluene 212 1 0 µgIL 25 0 ND 85 70-130 <br /> Chlorobenzene 21 9 1 0 lig/L 250 ND 88 70-130 <br /> Surrogate Dibromofluoromethane 176 Bg/L 200 88 70-130 <br /> Surrogate Toluene-d8 183 ,ug/L 200 92 70-130 <br /> Surrogate 4-Bromofluorobenzene 193 pug/L 200 96 70-130 <br /> Matrix Spike Du B000966-MSD1) Source 6042612-01 Prepared&Analyzed 04/27/06 <br /> 1,1-Dichloroethene(1,1-DCE) 198 1 0 pg/L 25 0 ND 79 70-130 4 20 <br /> Benzene 225 1 0 lig/L 25 0 ND 90 70-130 5 20 <br /> Trichloroethene(TCE) 220 1 0 pg/L 25 0 ND 88 70-130 5 20 <br /> Toluene 221 1 0 lig/L 25 0 ND 88 70-130 3 20 <br /> Chlorobenzene 222 1 0 µg/L 250 ND 89 70-130 1 20 <br /> Surrogate Dtbromofluoromethane 183 lig/L 200 91 70-130 <br /> Surrogate Toluene-d8 191 lig/L 200 96 70-130 <br /> Surrogate 4-Bromofluorobenzene 191 µg/L 200 96 70-130 <br /> Page 3 of 4 <br /> Lab Project# 6042614 CA Lab Accreditation# 2303 <br />