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819 Striker Ave Ste B <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> Ar"acquoualaba coin <br /> ' Geological Technics,lne Project Marct Property S412285 <br /> 1101 7th Street Project Number[none] Reported <br /> ' Modesto CA,95354 Project Manager Josepb Angulo 12/28/04 17 54 <br /> Gas olinelBTEXIOxygenates by EPA method 8260B -Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %aREC RPD <br /> Analyte Result Lumut Unuts Level Result %REC Limits RPD Limit Motes <br /> Batch 4120282:EPA 5030E PIT]/EPA 8260B -. <br /> Laboratory Control Sample(4120282-BS3) Prepared&Analyzed 12122/04 <br /> Methyl tertbutyl ether 180 050 ug/I 200 90 60-140 <br /> Benzene 189 050 200 94 70-130 <br /> Toluene 220 050 200 110 70-130 <br /> Surrogate 1,2-DCA d4 880 100 88 60-140 <br /> Surrogate Toluene-,d8 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 /> Methyl tert-butyl ether 184 050 ug/1 200 92 60-140 <br /> Benzene 149 050 200 74 70-130 <br /> Toluene 188 050 200 94 70-130 <br /> Surrogate 1 2-DCA-d4 114 100 114 60-140 <br /> MMU-99-te Toluene-d8 928 " 100 93 60-140 <br /> urrogale 4-BFB 942 100 94 60-140 <br /> Matrix Spllte(4120282-MSI) Source 5412285-01 Prepared&Analyzed 12/21/04 <br /> Methyl tent-bury]ether 318 050 ue 200 045 157 60-140 QM01 <br /> Benzene 179 050 20 0 ND 90 70-1.30 <br /> Toluene 210 050 200 RTD 105 70-130 <br /> ' Surrogate 1,2-DCA-d4 124 " 100 114 60-140 <br /> Surrogate Toluene-d8 916 100 92 60-140 <br /> Surrogate 4-BFB 946 10 0 95 60-140 <br /> Matrix S tke Au (4120282-MSDI) Source S412285-01 Prepared&Analyzed 12/21/04 <br /> ' Methyl Cert-butyl ether 43 1 050 ug/l 200 045 213 60-140 30 25 QC20,QMO 1 <br /> Benzene 222 050 200 ND 111 70-130 21 25 <br /> Toluene 205 050 20 0 ND 102 70-I30 2 25 <br /> Surrogate 12-DCA-d4 9 66 100 97 60-140 <br /> Surrogate Toluene-d8 925 100 92 60-140 <br /> Surrogate 4-BFB 960 _ _ " 100_ 96 60-140 <br /> ' Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Wass otherwise stated results are reported on a wet weight basis <br /> This analytical report must he reproduced in its entirety <br /> Page 12 of 16 <br /> 1 <br />