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8 19 Sequoia Ave S <br /> Sacramento <br /> CA 9! <br /> Analytical (916)921-9 <br /> FAX(91 6)9214 <br /> www seciuoialabs <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin HSA S409335 <br /> 1575 Treat Blvd,Ste 212 Protect Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Greg Berner Menna 09/30/04 11 52 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> 1 Analyte Result Limit Units _- Level Result %REC Limits -RPD Limit Notes <br />' Batch 4090320-EPA 5030B(PIT) <br /> Blank(40903_20-BLKI) _ Prepared&AnaIyzed 09/21/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/l <br /> Gasoline Range Organics(424-C 12) ND 50 <br /> Benzene ND 050 " <br /> Benzene ND 0 50 <br /> Toluene ND 0 50 <br /> Toluene ND 050 <br /> Ethylbenzene ND 0 50 " <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Xylenes(total) ND 0 50 " <br /> Methyl ter,-butyl ether ND 2 0 " <br /> Surrogate 4-BFB(FID) 101 100 101 60-140 <br /> Surrogate 4-BFB(FID) 101 100 101 60-140 <br /> Surrogate a a a-TFT(PID) 9 10 100 91 60-140 <br /> Surrogate a a a-TFT(PID) 910 II 10 0 91 60-140 <br /> Surrogate a a a-Trifluorotoluene 000 100 0-200 <br /> Blank(4090320-BLK2) _ Prepared&Analyzed 09/22104 - <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/I <br /> Gasoline Range Organics(C4-C 12) ND 50 <br /> Benzene ND 050 " <br /> Benzene ND 0 50 <br /> Toluene ND 0 50 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Ethylbenzene ND 0 50 I' <br /> Xylenes(total) ND 0 50 <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 0 <br /> Surrogate 4-BFB(FID) 108 10 0 108 60-140 <br /> Surrogate 4-BFB(FID) 108 100 108 60-140 <br /> Surrogate a a a TFT(PID) 103 100 103 60-140 <br /> 1 Surrogate a a a TFT(PID) 103 100 103 60 140 <br /> Sequoia Analytical-Sacramento <br /> Q y The results in this report apply to the samples analyzed in accordance with the chap <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 5 of <br />