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t819 Sinker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-900 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs torr <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin HSA S406583 <br /> 1575 Treat Blvd,Ste 212 Project Number NIA Reported <br /> Walnut Creek CA,94596 Project Manager Greg Bemer Menna 07/12/04 12 04 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015BI8021B-Quality Control <br /> ' <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RFD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4070017-EPA 5030H(P/T) <br /> Matrix Spike(4070017-MSl) Source S407001-02 Prepared&Analyzed 07/01/04 <br /> Benzene 103 050 ug/1 100 040 99 60-140 <br /> ' Toluene 106 0 50 " too 036 102 60-140 <br /> Ethylbenzene 11 0 0 50 100 071 103 60-140 <br /> Xylenes(total) 30 6 050 30 0 ND 102 60-140 <br /> ' Surrogate a a a-Trifluorotoluene 9 73 100 97 60-140 <br /> Matrix Spike Du 4070017-MSD/ Source 5407001-02 Prepared&Analyzed 07/01/04 <br /> Benzene 973 0 50 ugll 100 040 93 60-140 6 25 <br /> Toluene 10 1 050 100 0 36 97 60-140 5 25 <br /> Ethylbenzene 10 4 050 100 071 97 60-140 6 25 <br /> Xylenes(total) 29 0 050 300 ND 97 60-140 5 25 <br /> toSurrogate a a a-Trifluorotoluene 890 100 89 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 />