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Ste <br /> 819 mnto Ave 53 B <br /> Sequoia Sacramento CA 95834 <br />' (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> waw sequoialabs corn <br /> Weston Solutions,Inc-Walnut Creek Project San Joaquin HSA S303630 <br />' 1575 Treat Bivd.,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Jesslca Levine 04/09/03 17 58 <br />' Gasoline(2-Methylpentane to 1,2,4-Tnmetbylbenzene) and BTEX by EPA 8015M and 8021B-Quality Control <br /> Sequoia Analytical-Sacramento <br />' Reporting Spike Soimce %REC RPA <br /> Analyte Result Limit [Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3030394-EPA 5030B�/T) _ <br /> Blank 3030394-BLK2 Pre ared&Anal 03/26/03 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0 50 " <br />' Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether ND 2 0 " <br /> 1 Surrogate a a,a-Try7uorotoluene 966 100 97 60-140 <br />' Blank(3030394-BLK3) Prepared&Analyzed 03/28/03 <br /> Purgeable Hydrocarbons _ ND— 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> W <br /> thylbenzene ND 050 <br /> ylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Surrogate a,a,a-Trt luorotoluene 956 100 96 60-140 <br />' <br /> Laboratory Control Sample 3030394-BS2 &Anal 03/26/03 <br /> Benzene 9 23 050 WA 100 92 70-130 <br /> Toluene 920 050 " 100 92 70-130 <br /> Ethylbenzene 947 050 0100 95 70-130 <br /> Xylenes(total) 28 2 050 300 94 70-130 <br /> Methyl tent-butyl ether 105 2 0 100 105 70-130 <br />' Surrogate aa a-Trifluorotoluene 10 7 100 107 60-140 <br /> 1 <br /> Laboratory Control Sample 3030394-BS3 Prepared&Anal 03/28/03 <br /> Benzene 8 85 050 ugA 100 88 70-130 <br /> Toluene 896 050 100 90 70-130 <br /> Ethylbenzene 928 0 50 100 93 70-130 <br /> Xylenes(total) 274 0 50 300 91 70-130 <br /> Methyl tert-butyl ether 9 91 2 0 100 99 70-130 <br />' Sequoia Analytical-Sacramento The results in tbLs report apply to the samples analyzed in accordance with the chain <br /> of custody document_ Unless otherwise stated,results are reported on a wet werght <br /> basis T1iis analytical report must be reproduced to its entirety <br />' Page 5 of 9 <br />