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819 Sinker Ave Ste 8 <br /> Sequoia Saciainento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> www sequoislabs com <br /> ' Geological Technics,Inc Project Cardoza S412352 <br /> 1101 7th Street Project Number 662 2 Reported <br /> ' Modesto CA,95354 Protect Manager Joseph Angulo 01/03/05 17 30 <br /> GasolinelBTEXIOxygenates by EPA method 8260B-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result laaut Units revel Result %REC Lmmts RPD limit Notes <br /> Batch 4120282-EPA 5030B(PIT I I EPA 8260B <br /> Laboratory Control Sample(4120282-BS3) Prepared&Analyzed 12122104 <br /> Methyl tert butyl ether 180 050 ugA 200 90 60-140 <br /> ' Benzene 189 050 11 200 94 70-130 <br /> Toluene 220 050 200 110 70-130 <br /> Surrogate 12-DCA d4 880 100 88 60-140 <br /> ' Surrogate Toluene-& 107 100 107 60-140 <br /> Surrogate 4-BFB 966 100 97 60-140 <br /> Laboratory Control Sample(4120282-BS4) Prepared&Analyzed 12/26/04 <br /> ' <br /> Methyl Cert-butyl ether 184 050 ugll 200 92 60-140 <br /> Benzene 149 050 200 74 70-I30 <br /> Toluene 188 050 200 94 70-130 <br /> ftSurrogate 1,2 DCA-d4 114 100 114 60-740 <br /> Surrogate Toluene-d8 928 100 93 60-140 <br /> Surrogate 4-BFB 942 100 94 60-140 <br /> Matrix Spike(4120282-MSI) Source S412285-01 Prepared&Analyzed 12/21/04 <br /> Methyl tert-butyl ether 318 050 ugll 200 045 157 60-140 QMOI <br /> Benzene 179 050 200 ND 90 70-130 <br /> Toluene 210 050 200 ND 105 70-130 <br /> Surrogate 1 2-DC4-d4 124 100 724 60-140 <br /> Surrogate Toluene-d8 916 100 92 60-140 <br /> Surrogate 4-BFB 946 100 95 60-140 <br /> ' Matrix Spike Du 4120282-MSDI) Source 5412285-01 Prepared&Analyzed 12/21/04 <br /> Methyl tent-butyl ether 431 050 ugll 200 045 213 60-140 30 25 QC20,QMO1 <br /> Benzene 222 050 200 ND 111 70-130 21 25 <br /> Toluene 205 050 200 ND 102 70-130 2 25 <br /> Surrogate 1,2-DCA-d4 966 100 97 60-140 <br /> Surrogate Toluene-d8 915 100 92 60-140 <br /> Surrogate 4-BFB 960 100 96 60-140 <br /> 1 <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 11 of 13 <br />