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Sequoia 819 Striker Ave Ste l <br /> Sacramento,CA 9583, <br /> Analytical (916)921-960( <br /> FAX(916)921-01a <br /> www sequoialabs cot <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin HSA S404335 <br /> 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,44596 Project Manager Greg Bemer 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 /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4090320-EPA 5030B(P/T) <br /> Matrix Spike(4090320-MSI) _ Source S409335-04 Prepared&Analyzed 09/22/04 <br /> Benzene 12 1 050 119/1 100 ND 121 60-140 <br /> Benzene 12 1 050 100 ND 121 60-140 <br /> Toluene 12 1 050 100 ND 121 60-140 <br /> Toluene 12 1 0 50 100 ND 121 60-140 <br /> Ethylbenzene 12 0 0 50 i; 100 ND 120 60-140 <br /> Ethylbenzene 12 0 050 100 ND 120 60 140 <br /> Xylenes(total) 35 9 050 300 ND 120 60-140 <br />' Xylenes(total) 35 9 0 50 300 ND 120 60-140 <br /> Methyl tert butyl ether 12 4 2 0 100 ND 124 60-140 <br /> Surrogate 4-BFB(FID) 946 100 95 60-140 <br /> ib Surrogate 4-BFB(FID) 946 100 95 60-140 <br /> Surrogate a a a-TFT(PID) 926 100 93 60-140 <br /> Surrogate a a a-TFT fPID) 9 26 100 93 60-140 <br /> Matrix Spike Du (4090320-MSD1) Source 5409335-04 Pre aced&Analyzed 09/22/04 <br /> Benzene 9 97 050 ug/l 100 ND 100 60-140 19 25 <br /> Benzene 9 97 0 50 100 ND 100 60-140 19 25 <br /> Toluene 100 0 50 100 ND 100 60-140 19 25 <br /> Toluene 100 050 „ 100 ND 100 60 140 19 25 <br /> Ethylbenzene 982 050 100 ND 98 60-140 20 25 <br /> Ethylbenzene 9 82 050 100 ND 98 60 140 20 25 <br /> Xylenes(total) 295 0 50 300 ND 98 60-140 20 25 <br /> Xylenes(total) 29 5 050 300 ND 98 60 140 20 25 <br /> Methyl tert butyl ether 102 2 0 100 ND 102 60-140 19 25 <br /> Surrogate 4-BFB(FID) 8 99 100 90 60-140 <br /> Surrogate 4-BFB(FID) 899 100 90 60-140 <br /> Surrogate a a a-TFT(PID) 8 78 100 88 60-140 <br /> Surrogate a a a-TFT(PID) 8 78 100 88 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <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 7 of 8 <br />