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680 Chesapeake Drive Redwood City,CA 94063 (650)3649600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget lane Walnut Creek,CA 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 /> 455 McDowell Blvd. North,Ste. 0 Petaluma.CA 94954 (707) 792-1865 FAX(707) 792-0342 <br /> Analytical ',551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 3110/99 <br /> 9912 Business Park Drive, Ste. 100 Project Number: 7G600-022-02 Received: 3/11/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3115/99 <br /> TotaI 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: 903DIA2 ate Prepared: 3115/99 Extraction MethodaF,PA 50030B(MeOU) <br /> Dian k 9030169-BLK1 <br /> Purgeable Hydrocarbons 3115199 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 0.177 60.0-140 88.5 <br /> LEE 9030169-13SI <br /> Benzene 3115/99 0.200 0.156 mg/kg 70,0-130 78.0 <br /> Toluene 0.200 0.165 70.0-130 82.5 <br /> Ethylbenzene 0.200 0.165 70.0-130 82.5 <br /> eves(total) 0.600 0.463 70.0-130 77.2 <br /> yl tert-butyl ether 0.200 0.145_ 70.0-130 72.5 <br /> urrogale_ a,a,a-Triuorotoluene 0.200 0.176 " 60.0-140 88.0 <br /> Matrix Snike 9030169-MS1 5903146-02 <br /> Benzene 3115199 0.200 ND 0.157 mg/kg 60.0-140 78.5 <br /> Toluene 0.200 ND 0.169 60.0-140 84.5 <br /> Ethylbenzene 0.200 ND 0.171 60.0-140 85.5 <br /> Xylenes(total) 0.600 ND 0.481 60.0-140 80.2 <br /> Methyl Cert-butyl ether 0.200 ND 0.136 60.0-140 68.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.172 60.0-140 86.0 <br /> Matrix Spike Dun 9030169-MSD1 5903146-Q2 <br /> Benzene 3115199 0.200 ND 0.158 mg/kg 60.0-140 79.0 25.0 0.635 <br /> Toluene 0.200 ND 0.163 60.0-140 81.5 25.0 3.61 <br /> Ethylbenzene 0.200 ND 0.171 60.0-140 85.5 25.0 0 <br /> Xylenes(total) 0.600 ND 0.481 60.0-140 80.2 25.0 0 <br /> Methyl tent-butyl ether 0.200 ND 0.141 60.0-140 70.5 25.0 3.61 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.179 60.0-140 89.5 <br /> db <br /> STITuoia Analytical -Sacramento *Refer to end of report far text of notes and definitions. <br /> (S <br /> S n ra R. Hanson,Client Services Representative Page 4 of 6 <br />