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sequoia <br /> J Chesapeake Drive Redwood City. A 8 (650) 988-9600 FAX (650) 364-9233 <br /> / Sl, l,l ld ® la »04 N. Wiget Lane Walnut Creek, CA ci»�98 (925) 988-9600 FAX (925) 988-9673 <br /> 1 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921 -9600 FAX (916) 921 -0100 <br /> 1455 McDowell Blvd. North, Ste. D Petaluma, CA 94954 (707) 792- 1865 FAX (707) 792-0342 <br /> �,,,i) Analytical <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650) 232-9600 FAX (650) 232-9612 <br /> Gettler-Ryan - Sac Project: Chevron 9-3232, Stockton, CA Sampled: 4126/99 <br /> 3164 Gold Camp Dr., Ste. 240 Project Number: 346463.04 Received: 4/27/99 <br /> Rancho Cordova, CA 95670 Project Manager: Rick Fears Reported: 5/12/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical - Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch : 9050101 Date Prepared: 5/10/99 Extraction Method : EPA 5030B IMeOHI <br /> Blank 9050101 -BLK1 <br /> Tert-butyl alcohol 5/10/99 ND mg/kg 10.0 <br /> Methyl tert-butyl ether " ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol ND 150 <br /> Surrogate: 1,2-DCA-d4 2.50 2.81 60. 0-140 112 <br /> LCS 9050101-BSI <br /> Methyl tert-butyl ether 5/10/99 2.50 2.64 mg/kg 70.0- 130 106 <br /> Surrogate: 1,2-DCA-d4 ff2.50 2. 75 0160. 0-140 110 <br /> Matrix Spike 9050101-MSI 5905064-12 <br /> Methyl tert-butyl ether 5/10/99 2.50 ND 2.45 mg/kg 60.0-140 98+0 <br /> Surrogate: 1,2-DC444 It 2.50 2. 38 it 60. 0-140 95.2 <br /> Matrix Spike Dolt 9050101 -MSD1 5905064-12 <br /> Methyl tert-butyl ether 5/10/99 2.50 ND 2.44 mg/kg 60.0- 140 97.6 25 .0 0.409 <br /> Surrogate: 1,2-DCA-d4 2. 50 2.40 60. 0- 140 96. 0 <br /> Sequoia Analytical - Sacramento *Refer to end ofreport for text ofnotes and definitions. <br /> Sandra R. Hanson, Client Services Representative ,p�, Page 5 of 6 <br />