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4D819 Sinker Ave Ste B <br /> Sequoia Sacramento CA 95834 <br /> 4D <br /> qW Analytical (916)921-0100 <br /> FAX(916)921 0100 <br /> www sequoialabs com <br /> Weston Solutions inc-Walnut Creek Project San Joaquin HSA 5412468 <br /> 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Michelle Zehr 01/04/05 13 32 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quahty 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 4120334-EPA 5030B(P/T)/EPA 8015B/8021B <br /> Matrix Spike(4120334-MSI) Source S412468-01 Prepared&Analyzed 12/23/04 <br />' Benzene 9 99 0 50 119/1 too ND T 100 60-140 <br /> Toluene 9 94 0 50 " 100 ND 99 60-140 <br /> Ethylbenzene 9 85 050 100 ND 98 60-140 <br /> Xylenes(total) 29 4 0 50 300 ND 98 60-140 <br /> Surrogate 4-BFB(FID) 946 100 95 60-140 <br /> Surrogate a a a-TFT(PID) 8 71 100 87 60-140 <br /> Matrix Spike Dup 14120334-MSDl Source 5412468-01 Prepared&Analyzed 12/23/04 <br /> Benzene 978 0 50 ug/l 10 0 ND 98 60-140 2 25 <br /> Toluene 969 0 50 10 0 ND 97 60-140 3 25 <br /> Ethylbenzene 964 0 50 10 0 ND 96 60-140 2 25 <br /> Xylenes(total) 28 8 0 50 300 ND 96 60-140 2 25 <br /> rrogate 4-BFB(FID) 107 100 107 60-140 <br /> Surrogate a a a-TFT(PID) 8 7.3 100 87 60-140 <br /> 1 <br /> 1 <br /> 1 <br /> iSequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document Unless otherwise stated results are reported on a wet <br /> weight basis This analytical report must be reproduced in its entirety <br /> Page 9 of 12 <br /> 1 <br />