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p 0 Chesapeake Drive Redwood City. 53 (650) 364-9600 FAX (650) 364-9233 <br /> ' <br /> sequoia 404 N. Wiget Lane Walnut Creek, CAA 94598 (925) 988-9600 FAX (925) 988-9673 <br /> 819 Striker 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 /> F <br /> tler-Ryan - Sac Project: Chevron 9-3232, Stockton, CA Sampled: 4/26/99 <br /> 4 Gold Camp Dr., Ste. 240 Project Number: 346463.04 Received: 4/27/99 <br /> ncho Cordova, CA 95670 Project Manager: Rick Fears Reported: 5/12/99 <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 /> Batch • 9050044 Date Prepared : 5/4/99 Extraction Method; EPA 5030B (_MeOH) <br /> Blank 9050044-BLKI <br /> Purgeable Hydrocarbons 5/4/99 ND mg/kg 1 .00 <br /> ii Benzene " ND 0.00500 <br /> Toluene " ND 0.00500 <br /> Ethylbenzene it ND to 0,00500 <br /> Xylenes (total) " ND to 0.00500 <br /> Methyl tert-butyl ether if ND to 0.0500 <br /> Surrogate: a, a,a-Triiluorotoluene It 0.200 0. 179 or 60. 0-140 89: 5 <br /> LHS 9050044-BSI <br /> Benzene 5/4/99 0.200 0. 196 mg/kg 70. 0- 130 98.0 <br /> Toluene " 0.200 0.210 " 70.0- 130 105 <br /> Ethylbenzene 0.200 0.213 " 70.0- 130 106 <br /> Xylenes (total) 0.600 0.574 It 70.0-130 95 ,7 <br /> Methyl tert-butyl ether 0.200 0. 177 70.0- 130 88.5 <br /> Surrogate: a,a,a- Tri luorotohtene 0.200 0. 185 " 60.0-140 92. 5 <br /> Matrix Spike 9050044-MSI S905036-04 <br /> Benzene 5/4/99 0.200 ND 0. 168 mg/kg 60.0- 140 84,0 <br /> Toluene 0.200 ND 0. 185 " 60.0- 140 92.5 <br /> Ethylbenzene 0.200 ND 0. 190 to 60.0- 140 95.0 <br /> Xylenes (total) 0.600 ND 0.528 160.0- 140 88.0 <br /> Methyl tert-butyl ether to 0.200 ND 0. 156 " 60.0-140 78.0 <br /> Surrogate: a,a,a-Tris luorotoluene 010.200 0. 181 IF60. 0-140 90. 5 <br /> Matrix Spike Dup 9050044-MSDI 5905036-04 <br /> Benzene 5/4/99 0.200 ND 0. 172 mg/kg 60.0- 140 86.0 25.0 2.35 <br /> Toluene " 0.200 ND 0. 180 to 60.0- 140 90.0 25 .0 2.74 <br /> Ethylbenzene 0.200 ND 0. 193 to 60.0- 140 965 25 .0 1 ,57 <br /> Xylenes (total) 0.600 ND 0.534 to 60.0- 140 89.0 25 .0 1413 . <br /> Methyl tert-butyl ether 0.200 ND 0. 162 to 60.0- 140 81 .0 25.0 3.77 <br /> Surrogate: a,a,a-Triuorotoluene 0.100 0. 190 It60. 0-140 95. 0 <br /> Sequoia Analytical - Sacramento y� *Refer to and ofrepori for text ofnotes and definitions. <br /> m7 <br /> �fc� r� <br /> Sandra R. Hanson, Client Services Representative Page 4 of 6 <br />