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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 /> Batch: 9080398 Date Prepared: 8/17/99 Extraction Method: EPA 5030 soils <br /> Blank 9080398-BLKI <br /> Gasoline 8/17/99 ND mg/kg 0.400 <br /> Benzene ND 0.00200 <br /> Toluene ND 0.00200 <br /> Ethylbenzene ND 0.00200 <br /> Xylenes(total) ND 0.00400 <br /> Methyl tert-butyl ether ND 0.0100 <br /> Surrogate: a,a,a-Trifluorotoluene 0.300 0.328 65.0-135 109 <br /> Surrogate: 4-Bromofluorobenzene 0.300 0.272 65.0-135 90.7 <br /> Blank 9080398-BLK2 <br /> Gasoline 8/18/99 ND mg/kg 0.400 <br /> Benzene ND 0.00200 <br /> Toluene ND 0.00200 <br /> Ethylbenzene ND 0.00200 <br /> Xylenes(total) ND 0.00400 <br /> Methyl tert-butyl ether ND 0.0100 <br /> Surrogate: a,a,a-Trifluorotoluene 0.300 0.342 65.0-135 114 <br /> Surrogate: 4-Bromofluorobenzene 0.300 0.275 65.0-135 91.7 <br /> Blank 9080398-BLK3 <br /> Gasoline 8/19/99 ND mg/kg 0.400 <br /> Benzene ND 0.00200 <br /> Toluene ND 0.00200 <br /> Ethylbenzene ND 0.00200 <br /> Xylenes(total) ND 0.00400 <br /> Methyl tert-butyl ether ND 0.0100 <br /> Surrogate: a,a,a-Trifluorotoluene 0.300 0.335 65.0-135 112 <br /> Surrogate: 4-Brom0fluorobenzene 0.300 0.278 65.0-135 92.7 <br /> LCS 9080398-BSI <br /> Benzene 8/17/99 0.200 0.205 mg/kg 65.0-135 102 <br /> Toluene 0.200 0.205 65.0-135 102 <br /> Ethylbenzene 0.200 0.201 65.0-135 101 <br /> Xylenes(total) 0.600 0.663 65.0-135 110 _ <br /> Surrogate: a,a,a-Trifluorotoluene 0.300 0.289 65.0-135 96.3 <br /> LCS 9080398-13S2 <br /> Benzene 8/18/99 0.200 0.207 mg/kg 65.0-135 103 <br /> Toluene 0.200 0.209 65.0-135 105 <br /> Ethylbenzene 0.200 0.204 65.0-135 102 <br /> Sequoia Analytical-Petaluma *Refer to end of report for text of notes and definitions. <br /> Pave 10 of 16 <br />