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1455 McDowell Blvd.North,Ste,D <br /> Sequoia Petaluma, -1865 <br /> 94954 <br /> (707)79 2-1865 <br /> FAX(707)792-0342 <br /> Analytical www.sequoialabs.com <br /> Cambria Environmental-Oakland Project: Equiva <br /> 1144 65th St.,Suite C Project Number: 341 E.Main St.,Ripon Reported: <br /> Oakland CA,94608 Project Manager: Owen Ratchye 10/06/00 17:59 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015M/8020M- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 0100053-EPA 5030 waters <br /> Blank(0100053-BLKI) _ Prepared&Analyzed: 10/03/00 <br /> Gasoline ND 50.0 ug/1 <br /> Benzene ND 0.500 " <br /> Toluene ND 0.500 " <br /> Ethylbenzene ND 0.500 " <br /> Xylenes(total) ND 0.500 " <br /> Methyl tert-butyl ether ND 2.50 " <br /> Surrogate:a,a,a-Tris luorotoluene 333 300 111 65-135 _ �^ <br /> Surrogate:4-Bromofluorobenzene 283 300 94.3 65-135 <br /> LCS(0100053-BSI) _ _ Prepared&Analyzed: 10/03/00 —_ <br /> Gasoline 899 50.0 ug/l 1000 89.9 65-135 <br /> glogate:4-Bromofluorobenzene .285 300 95.0 65-135 <br /> atrix Spike(0100053-MSI) Source: P009640-01 Prepared&Analyzed: 10/03/00 <br /> Gasoline 866 50.0 ug/l 1000 ND 86.6 65-135 <br /> Surrogate:4-Bromofluorobenzene 280 " 300 93.3 65-135 <br /> Matrix Spike Dup(0100053-MSD1) Source: P009640-01 Prepared&Analyzed: 10/03/00 _ <br /> Gasoline 867 50.0 ugll 1000 ND 86.7 65-135 0.115 20 <br /> Surrogate:4-Bromofluorobenzene 282 300 94.0 65-135 <br /> quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 6 of 9 <br />