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819 Striker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> 4D (916)921-9600 <br /> 1W Analytical FAX(916)921-0100 <br /> www segtioialabs corn <br /> ttler-Ryan-Rancho Cordova Project Former Unocal 0187,Stockton,CA S302535 <br /> t4o <br /> Gold CampDr,Ste 170 Project Number NIA Reported <br /> ncho Cordova CA,95670 Project Manager Geoffrey D Risse 03/07/03 17 32 <br /> Gasoline(2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B- Quality Contr <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3020394-EPA 5030B(PIT) <br /> Blank(3020394-BLK4) Prepared&Analyzed 03/04/03 <br /> Methyl tert-butyl ether ND 20 ug/l <br /> Surrogate a a a-Tnfluorotoluene 869 It <br /> 100 87 60-140 <br /> Laboratory Control Sample(3020394-BS1) Prepared&Analyzed 02/27/03 <br /> Benzene 110 050 ug/l 100 110 70-130 <br /> Toluene 108 050 100 108 70-130 <br /> Ethylbenzene 107 050 100 107 70-130 <br /> Xylenes(total) 327 050 300 109 70-130 <br /> Methyl tert-butyl ether 11 1 2 0 100 111 70-130 <br /> Surrogate a a a-Trrfluorotoluene 204 200 102 60-140 <br /> 4koratory Control Sample(3020394-BS2) Prepared&Analyzed 02/28/03 <br /> Benzene 112 050 ug/l 100 112 70-130 <br /> Toluene 111 050 100 111 70-130 <br /> Ethylbenzene 10 9 050 100 109 70-130 <br /> Xylenes(total) 331 050 300 110 70-130 <br /> Methyl tert-butyl ether 104 2 0 100 104 70-130 <br /> Surrogate a a a-Trrfluorotoluene 112 100 112 60-140 <br /> Laboratory Control Sample(3020394-BS3) Prepared&Analyzed 03/03/03 <br /> Benzene 107 050 ug/I 100 107 70-130 <br /> Toluene 105 050 Wo 105 70-130 <br /> Ethylbenzene 10 4 0 50 100 104 70-130 <br /> Xylenes(total) 316 050 300 105 70-130 <br /> Methyl tert-butyl ether 108 2 0 100 108 70-130 <br /> Surrogate a a a-Tri luorotoluene 106 100 106 60-140 <br /> Laboratory Control Sample(3020394-BS4) Prepared&Analyzed 03/04/03 <br /> Benzene 106 050 ug/l 10 0 106 70-130 <br /> Toluene 11 1 0 50 " 100 111 70-130 <br /> oia 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 7 of 9 <br />