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Sequoia 1455 McDowell Blvd North 51e <br /> Petaluma,CA 949544 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> ler-Ryan/Geostrategies(1) Project Unoca](4) <br /> Sierra Court- Suite J Project Number Former Unocal#0187,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/24/02 16 38 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050047-EPA 5030B(PIT) <br /> Matrix Spike(2050047-MSI) Source L205032-05 Prepared&Analyzed 05/21/02 <br /> Surrogate 0,0 a-Trtfluoroioluene 998 ug/1 100 998 70-130 <br /> Matrix Spike Dup(2050047-MSD1) Source L205032-05 Prepared&Analyzed 05/21/02 <br /> Benzene 102 050 ug/l 100 ND 102 60-140 523 25 <br /> Toluene 9 63 050 100 ND 963 60-140 4 13 25 <br /> Ethylbenzene 9 14 050 100 ND 914 60-140 4 93 25 <br /> Xylenes(total) 268 050 n300 ND 89 3 60-140 419 25 <br /> Surrogate a,a,a-Tr ftuorotoluene 104 /00 104 70-130 <br /> • <br /> to Analytica] -San Carlos The results to this report apply to the samples analysed in accordance with the chain of <br /> custody document Thrs analylrml report must be reproduced rn its entirety <br /> Page 25 of 30 <br />