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1 819 Strtker Ave Sfe 8 <br /> / d \ Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921 0 <br /> www sequoiialabsco0m <br /> i <br /> ' Geological Technics,Inc Project Cardoza S312120 <br /> 1101 7th Street Project Number 662 2 Reported <br /> ' Modesto CA,95354 Project Manager Joseph Angulo 01/23/04 17 37 <br /> Gas olinelBTEXIOxygenates by EPA method 8260B - Quality Control <br /> ' Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Restilt Limit Units Level Result %REC Limits RPD Limit Notes <br /> ' Batch 3120094-EPA 5030B IP/Tt <br /> Laboratory Control Sample(3120094-BSI) Prepared&Analyzed 12/08/03 <br /> Methyl tett-butyl ether 214 050 ug/l 248 86 60-140 <br /> ' Benzene 127 050 1 16 0 79 70-130 <br /> Toluene 860 050 1. 74 2 116 70-130 <br /> Gasoline Range Organics 1020 50 1140 93 70-130 <br /> ' Surrogate Toluene-d8 261 " 250 104 60-140 <br /> Surrogate 4-BFB 252 250 101 60-140 <br /> Surrogate 12 DCA d4 26 1 250 104 60-140 <br /> ' Laboratory Control Sample(3120094-BS2) Prepared&Analyzed 12/05/03 <br /> Methyl tert-butyl ether 282 050 ug/l 250 113 60-140 <br /> Benzene 252 050 1. 250 lot 70-130 <br /> Toluene 265 050 25 0 106 70-130 <br /> rrogate Toluene-d8 258 250 103 60-140 <br /> Surrogate 4-BFB 244 " 250 98 60-140 <br /> Surrogate 1 2-DCA d4 269 " 250 108 60-140 <br /> ' Matrix Spike(3120094-MSI) Source S312120-04 Prepared 12/08/03 Analyzed 12/09/03 <br /> Methyl tert-butyl ether 259 050 ug/1 24 8 9 6 65 60-140 <br /> Benzene 128 050 " 1450 ND 80 70-130 <br /> ' Toluene 863 050 " 742 ND 116 70-130 <br /> Gasoline Range Organics 925 50 1100 ND 84 60-140 <br /> Surrogale Toluene-d8 260 25 0 104 60-140 <br /> ' Surrogate 4-BF8 234 250 94 60-140 <br /> Surrogate 12 DCA d4 272 25 0 109 60-140 <br /> Matrix Spike Dup(3120094-MSD1) Source 5312120-04 Prepared 12/08/03 Analyzed 12/09/03 <br /> ' Methyl tett-butyl ether 295 050 ug/l 248 9 6 76 60-140 10 25 <br /> Benzene 123 050 160 ND 77 70-130 4 25 <br /> Toluene 83 1 050 742 ND 112 70-130 4 25 <br /> Gasoline Range Organics 888 50 1100 ND 81 60-140 4 25 <br /> ' Surrogate Toluene48 263 " 250 105 60-140 <br /> Surrogate 4-BF3 242 2.50 97 60-140 <br /> Surrogate 12 DCA d4 268 " 250 107 60-140 <br /> tSequoia Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a xet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 19 of 25 <br />