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( A. <br /> Wigeake Drive Redwood City. (650) 364-9600 FAX (650) 364-9233 <br /> Sequoia euOla 4i.+ iJWiget Lane Walnut Creek, CAA 944 5.., (925) 988-9600 FAX (925) 988-9673 <br /> 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921 -9600 FAX (916) 921 -0100 <br /> M%ff 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 (126-1212), 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 /> Blank (gynthnucQ 9050131 -BLKI <br /> Surrogate: a,a,a- Triiluarotoluene 5111/99 0.200 0. 167 mg/kg 60. 0-140 83.5 <br /> LIES. 9050131-BSI <br /> Benzene 5/11 /99 0.200 0. 188 mg/kg 70.0-130 94.0 <br /> Toluene 0.200 0. 197 if 70.0- 130 98.5 <br /> Ethylbenzene 0.200 0. 199 70.0-130 99.5 <br /> Xylenes (total) 0.600 0. 598 70.0-130 99.7 <br /> Methyl tert-butyl ether 0.200 0. 172 70.0- 130 86.0 <br /> Surrogate: a,a,a- Trii luorotoluene 0.200 0. 165 60. 0- 140 82.5 <br /> Matrix Spike 9050131 -MSI S905112-42 <br /> Benzene 5/ 11/99 0.200 ND 0. 197 mg/kg 60.0- 140 98.5 <br /> Toluene It 0.200 0.00538 0.200 60.0- 140 97.3 <br /> Ethylbenzene to 0.200 ND 0.202 60.0- 140 101 <br /> Xylenes (total) 0.600 0.0254 0. 612 60.0-140 97.8 <br /> Methyl tert-butyl ether 0.200 ND 0. 191 of 60.0- 140 95.5 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 0. 184 of 60.0-140 92. 0 <br /> Matrix Spike Duu 9050131 -MSDI S905112-42 <br /> Benzene 5/ 11/99 0.200 ND 0. 193 mg/kg 60.0- 140 96.5 25.0 2.05 <br /> Toluene If 0.200 0.00538 0. 198 of 60.0-140 96.3 25 .0 1 .03 <br /> Ethylbenzene If 0.200 ND 0. 198 60.0-140 99.0 25 .0 2.00 <br /> Xylenes (total) " 0.600 0.0254 0.598 60.0-140 95.4 25 . 0 2.48 <br /> Methyl tert-butyl ether to 0.200 ND 0. 177 60.0-140 88.5 25 . 0 7.61 <br /> Surrogate: a,a,a- Trifluorotohane to0.200 0. 182 60. 0-140 91. 0 <br /> Batch : 9050133 Date Prepared : 5112199 Extraction Method: EPA 5030B (MeOH) <br /> Blank 9050133-BLKI <br /> Purgeable Hydrocarbons 5/ 12/99 ND mg/kg 1 .00 <br /> Benzene " ND to 0.00500 <br /> Toluene IN ND 0.00500 <br /> Ethylbenzene to ND 0.00500 <br /> Xylenes (total) to ND 0,00500 <br /> Methyl tert-butyl ether to ND 0.0500 <br /> Surrogate. a,a, a-Trii luorotohlene " 0.200 0. 176 60.0-140 88. 0 <br /> LCS 9050133-BSI <br /> Benzene 5/ 12/99 0.200 0. 171 mg/kg 70.0-130 85.5 <br /> Toluene " 0.200 0.207 70.0- 130 103 <br /> Ethylbenzene If 0.200 0.211 70.0- 130 105 <br /> Xylenes (total) 0.600 0.569 to 70.0- 130 94. 8 <br /> Sequoia Analytical - Sacramento *Refer to end ofreport for text of notes and definitions. <br /> Page 10 of IS <br /> Sandra R. Hanson, Client Services Representative <br />