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819 Stnker Ave Ste 8 <br /> a— ) Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequotalabs com <br /> ttler-Ryan-Rancho Cordova Project Former Unocal 2859,Stockton,CA S302536 <br /> 0 Gold Camp Dr,Ste 170 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Geoffrey D Rlsse 03/07/03 18 38 <br /> Gasoline (2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B- Quality Contlr <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %R-EC RPD <br /> LA-lyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3030038-EPA 5030B P/T <br /> Laboratory Control Sample(3030038-BS1) Prepared&Analyzed 03/04/03 <br /> Surrogate a a a-Triuorotoluene 105 119/1 100 105 60-140 <br /> Laboratory Control Sample(3030038-BS2) Prepared&Analyzed 03/05/03 <br /> Benzene 106 050 ug(l too 106 70-130 <br /> Toluene 105 0 50 100 105 70-130 <br /> Ethylbenzene 103 050 100 <br /> 103 70-130 <br /> Xylenes(total) 315 0 50 300 <br /> 105 70-130 <br /> Methyl tert-butyl ether 101 2 0 too 101 70-130 <br /> Surrogate a a a-Triuorotoluene 105 100 105 60-140 <br /> Jgilboratory Control Sample(3030038-BS3) Prepared&Analyzed 03/06/03 <br /> ne 103 050 ug/1 100 103 70-130 <br /> Toluene 102 050 10 0 <br /> 102 70-130 <br /> Ethylbenzene 999 050 100 100 70-130 <br /> Xylenes(total) 304 050 300 <br /> 101 70-130 <br /> Methyl tert-butyl ether 968 20 too 97 70-130 <br /> Surrogate a a a-Trifluorotoluene 102 100 101 60-140 <br /> Matrix Spike(3030038-MSI) Source S302579-02 Prepared&Analyzed 03/05/03 <br /> Benzene 107 0 50 ug/I 100 ND 107 60-140 <br /> Toluene 106 050 10 0 ND 106 60-140 <br /> Ethylbenzene 104 0 50 100 ND 104 60-140 <br /> Xylenes(total) 31 6 0 50 300 ND 105 60-140 <br /> Methyl tert-butyl ether 107 2 0 100 065 100 60-140 <br /> Surrogate aaa-Tris luorotoluene 105 100 105 60-140 <br /> Matrix Spike Du (3030038-MSDI) Source S302579-02 Prepared&Analyzed 03/05/03 <br /> Benzene 107 050 ug/l 100 ND 107 60-140 0 25 <br /> Toluene 104 050 100 ND 104 60-140 2 25 <br /> Ethylbenzene 104 050 100 ND 104 60-140 0 25 <br /> Xylenes(total) 318 050 300 ND 106 60-140 0 6 25 <br /> ola Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of 8 <br />