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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N.Wiget lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 {9161 921-9600 FAX(916)921-0 100 <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 /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/10/99 to 2/12/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/16/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/2/99 <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 /> L,CS(continued] 9020246-$31 <br /> Methyl tert-butyl ether 2/19/99 0.200 0.204 mg/kg 70.0-130 102 <br /> Surrogate: a,a,a-Tris luorotoluene 110.200 0.181 60.0-140 90.5 <br /> Matj-ix Spike 9020246-MS1 S902236-01 <br /> Benzene 2/19/99 0.200 ND 0.160 mg/kg 60.0-140 80.0 <br /> Toluene 0.200 ND 0.163 60.0-140 81.5 <br /> Ethylbenzene 0.200 ND 0.166 60.0-140 83.0 <br /> Xylenes(total) 0.600 ND 0.504 60.0-140 84.0 <br /> Methyl tert-butyl ether 0.200 ND 0.197 60.0-140 98.5 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 0.187 60.0-140 93.5 <br /> Matrix Spike pup 9021 46-MSD1 5907 3.2 6-01 <br /> Benzene 2/19/99 0.200 ND 0.161 mg/kg 60.0-140 80.5 25.0 0.623 <br /> ene " 0.200 ND 0.158 60.0-140 79.0 25.0 3.12 <br /> lbenzene 0.200 ND 0.166 60.0-140 83.0 25.0 0 <br /> Xylenes(total) 0.600 ND 0.501 60.0-140 83.5 25.0 0.597 <br /> Methyl tert-butyl ether 0.200 ND 0.195 60.0-140 97.5 25.0 1.02 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.187 60.0-140 93.5 <br /> Batch;-9020254 Extraction Method: EPA 503013(Me= <br /> Blank 9020254-BLKI <br /> Purgeable Hydrocarbons 2/22/99 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Methyl tert-butyl ether ND 0.0500 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.193 60.0-140 96.5 <br /> i.C'S 9020254-BS1 <br /> Benzene 2/22199 0.200 0.199 mg/kg 70.0-130 99.5 <br /> Toluene 0.200 0.202 70.0-130 101 <br /> Ethylbenzene 0.200 0.203 70.0-130 101 <br /> Xylenes(total) 0.600 0.608 70.0-130 101 <br /> Methyl tert-butyl ether 0.200 0.196 70.0-130 98.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.197 60.0-140 98.5 <br /> Matrix_Spike 9020254-MSI 59Q2Z87-12 <br /> Benzene 2/22/99 0.200 ND 0.170 mglkg 60.0-140 85.0 <br /> Toluene 0.200 ND 0.174 60.0-140 87.0 <br /> -Qhvlbenzene 0.200 ND 0.173 60.0-140 86.5 <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> 112 <br /> �J`� <br /> Sandra4as�onent Services Representative Page l l of l5 <br />