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Sequoia 1455 McDowell Blvd. North,Ste. D <br /> ' Petaluma,CA 94954 <br /> (707) 792-1865 <br /> Analytical FAX(707) 792-0342 <br /> Cambria Environmental Project: Shell Oil Co. Sampled: 8/11/99 to 8/12/99 <br /> 270 Perkins St. Project Number: 440 W Charter,Stockton Received: 8/13/99 <br /> Sonoma,CA 95476 Project Manager: Aubrey Cool Reported: 8/20/99 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015M/8020M/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> LCS(continued) 9080398-BS2 <br /> Xylenes(total) 8/18/99 0.600 0.674 mg/kg 65.0-135 112 <br /> Surrogate: a,a,a-Tris luorotoluene 110.300 0.309 65.0-135 103 <br /> LCS 9080398-BS3 <br /> Gasoline 8/19/99 2.00 1.93 mg/kg 65.0-135 96.5 <br /> Surrogate: 4-Bromofluorobenzene 110.300 0.283 65.0-135 94.3 <br /> Matrix Spike 9080398-MSI P908378-01 <br /> Benzene 8/17/99 0.200 ND 0.202 mg/kg 65.0-135 101 <br /> Toluene 0.200 ND 0.202 65.0-135 101 <br /> Ethylbenzene 0.200 ND 0.198 65.0-135 99.0 <br /> Xylenes(total) 0.600 0.0172 0.663 65.0-135 108 <br /> Surrogate.- a,a,a-Trifluorotoluene 0.300 0.320 65.0-135 107 <br /> Matrix Spike Dup 9080398-MSDI P908378-01 <br /> Benzene 8/17/99 0.200 ND 0.208 mg/kg 65.0-135 104 20.0 2.93 <br /> Toluene 0.200 ND 0.208 65.0-135 104 20.0 2.93 <br /> Ethylbenzene 0.200 ND 0.203 65.0-135 101 20.0 2.00 <br /> Xylenes(total) 0.600 0.0172 0.680 65.0-135 110 20.0 1.83 _ <br /> Surrogate: a,a,a-Tris luorotoluene 0.300 0.326 65.0-135 109 <br /> Sequoia Analytical-Petaluma *Refer to end of report for tent of notes and definitions. <br /> Page 11 of 16 <br />