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1455 McDowell Blvd. North, Ste. D <br /> Sequoia Petaluma. CA 94954 <br /> 4 (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 /> Volatile Organic Compounds by EPA Method 8260B/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analvzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Matrix Spike 9080470-MS1 P908378-01 <br /> Methyl tert-butyl ether 8/19/99 0.0500 ND 0.0427 mg/kg ',5.8-124 85.4 <br /> Surrogate: Dibromofluoromethane 0.0500 0.0459 80.0-120 91.8 <br /> Surrogate: 1,2-Dichloroethane-d4 0.0500 0.0433 80.0-120 86.6 <br /> Surrogate: Toluene-d8 0.0500 0.0481 81.0-117 96.2 <br /> Surrogate: 4-Bromof luorobenzene 0.0500 0.0451 74.0-121 90.2 <br /> Matrix Spike Dup 9080470-MSDI P908378-01 <br /> Methyl tert-butyl ether 8/19/99 0.0500 ND 0.0492 mg/kg 75.8-124 98.4_35.0 14.1 <br /> Surrogate: Dibromofluoromethane 0.0500 0.0475 80.0-120 95.0 <br /> Surrogate: 1,2-Dichloroethane-d4 0.0500 0.0457 80.0-120 91.4 <br /> Surrogate: Toluene-d8 0.0500 0.0495 81.0-117 99.0 <br /> Surrogate: 4-BromoJluorobenzene 0.0500 0.0454 74.0-121 90.8 <br /> Sequoia Analytical-Petaluma *Refer to end of report for text of notes and definitions. <br /> Page 15 of 16 <br />