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Sequoia E (esapeake Drive Redwood City, CA 94 (650) 364-9600 FAX (650) 364-9233 <br /> ' -1/ ' 4u_ A. Wiget Lane Walnut Creek, CA 945 . _ (925) 988-9600 FAX (925) 988-9673 <br /> 819 Stril(er Avenue, Suite 8 Sacramento, CA 95834 (916) 921 -9600 FAX (916) 921 -0100 <br /> Analytical 1455 McDowell Blvd, North, Ste. D Petaluma, CA 94954 (707) 792- 1865 FAX (707) 792-0342 <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: 5/5/99 to 5/6/99 <br /> 3164 Gold Camp Dr., Ste. 240 Project Number: 346463 .04 Received: 5/7/99 <br /> Rancho Cordova, CA 95670 Project Manager: Rick Fears Reported: 5/ 14, 19/99 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT/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 /> '11atric Spike (continued) 9050146-MS1 5905138-09 <br /> Xylenes (total) 5/ 12/99 0.600 ND 0.562 mg/kg 60.0- 140 93.7 <br /> Methyl tert-butyl ether 1 - 0.200 ND 0. 159 " 60.0-140 79.5 <br /> Surrogate: a,a, a-Trii luorotoluene if 0.200 0. 176 to 60. 0- 140 88. 0 <br /> Matrix Spike Duo 9050146-MSDI 5905138-09 <br /> Benzene 5/ 12/99 0.200 ND 0. 171 mg/kg 60.0- 140 85.5 25 .0 0.587 <br /> Toluene it 0.200 ND 0. 181 to 60.0- 140 90.5 25 .0 1910 <br /> Ethylbenzene it 0.200 ND 0. 185 It 60.0- 140 92.5 25 .0 0.542 <br /> Xylenes (total) " 0.600 ND 0.559 60.0- 140 93.2 25.0 0.535 <br /> Methyl tert-butyl ether It 0.200 ND 0. 145 60.0-140 72.5 25.0 9.21 <br /> Surrogate: a,a, a- Trifluorotoluene it 0.200 0. 174 60. 0-140 87.0 <br /> Sequoia Analytical - Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson, Client Services Representative Page 12 of 15 <br />