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1 <br /> 819 Sinker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> A alyYe al (416)921-9600 <br /> FAX(916)921-0100 <br /> www soquotalabs cum <br /> 0 <br /> ' Geological Technics,Inc Prosect Marcs Property 5412285 <br /> 1101 7th Street Project Number[none] Reported <br /> ' Modesto CA,95354 Prosect Manager Joseph Angulo 12/28/04 17 54 <br /> GasohneWEXIOxygenates by EPA method 8260B - Quality Control <br /> ' <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lnmt Units Level Result %R)rC Limits RPD Limit Notes <br /> ' Batch 4120312-EPA 5030B [PIT]/EPA 8260B _ <br /> Laboratory Control Sam le(4120312-BSI) Prepared&Analyzed 12/22/04 <br /> Methyl tert-butyl ether 166 050 ug/l 200 83 60-140 <br /> ' Benzene 174 050 200 87 70-130 <br /> Toluene 202 050 200 lot 70-130 <br /> Surrogate 12-DCA-d4 886 " 100 89 60-140 <br /> Surrogate Toluene-d8 106 100 106 60-140 <br /> Surrogate 4-BFB 978 100 98 60-140 <br /> Laboratory Control Sam le(4120312-BS2) Prepared 12/22/04 Analyzed_ 12/23/04 <br />' Methyl tert-butyl ether 436 050 ugA 432 101 60-140 Benzene 261 050 „ 268 97 70430 <br /> Toluene 184 050 152 121 70-130 <br /> Gasoline Range Organics(C4-C12) 2350 50 2200 107 70-130 <br /> urrogate 12-DCA-d4 936 100 94 60-140 <br /> urrogate Toluene-d8 103 100 103 60-140 <br /> Surrogate 4-BFB 103 100 103 60-140 <br /> _Laboratory Control Sample Dup(4120312-BSDI) Prepared&Analyzed 12/23/04 <br /> Methyl tert-butyl ether 176 050 ug/1 200 88 60-140 6 25 <br /> Benzene 197 050 200 94 70-130 7 25 <br />' Toluene 19 8 050 200 99 70130 2 25 <br /> Surrogate 12-DCA-d4 890 100 89 60-140 <br /> Surrogate Toluene-dS 918 100 92 60-140 <br /> Surrogate 4-BFB 943 100 94 60-140 <br />' Matrix Spike(4120312-MS1) Source S412313-01 Prepared&Analyzed 12/22/04 <br /> Methyl tert-butyl ether 192 050 ugA 200 ND 96 60-140 <br /> Benzene 20 3 050 200 ND 102 70-130 <br />' Toluene 230 050 ry 200 ND 115 70-130 <br /> Surrogate 12 DCA-d4 868 100 87 60-140 <br /> Surrogate Toluene-d8 _ _ 10 7 100 107 60-140 <br /> Surrogate 4-BFB 955 100 96 60-140 <br />' <br /> Sequoia 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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 14 of 16 <br />