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819 Striker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> a_ � <br /> W Analytical FAX(916)921-0100 <br /> www sequoialabs corn <br /> ttler-Ryan-Rancho Cordova Project Former Unocal 2859,Stockton,CA 5301507 <br /> 40 Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Geoffrey D Risse 02/05/03 17 48 <br /> Gasoline (2-Methylpentane to 1,2,1-Trimethylbenzene) and BTEX by EPA 8015M and 8021B - Quality Contr <br /> Sequoia Analytical- Sacramento <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3010455-EPA 5030B PIT <br /> Laboratory Control Sample(3010455-BS1) Prepared&Analyzed 01/28/03 <br /> Surrogate a a a-Triuorotoluene 102 ug/l 100 102 60-140 <br /> Laboratory Control Sample(3010455-BS3) Prepared&Analyzed 01/30/03 <br /> Benzene 963 050 ug/l 100 96 70-130 <br /> Toluene 101 050 100 101 70-130 <br /> Ethylbenzene 978 050 100 98 70-130 <br /> Xylenes(total) 288 050 300 96 70-130 <br /> Methyl tent-butyl ether 106 2 0 100 106 70-130 <br /> Surrogate a a,a-Trifluorotoluene 988 100 99 60-140 <br /> Aftioratory Control Sample(3010455-BS4) Prepared&Analyzed 01/31/03 <br /> ene 982 050 ug/! 100 98 70-130 <br /> Toluene 102 050 100 102 70-130 <br /> Ethylbenzene 974 0 50 100 97 70-130 <br /> Xylenes(total) 292 050 300 97 70-130 <br /> Methyl tert-butyl ether 105 20 100 105 70-130 <br /> Surrogate a a a-Trifluorololuene 988 t o o 99 60-140 <br /> �uoia 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 /> u <br /> Page 6 of 7 <br />