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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wtget 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)921-0 100 <br /> ID I„D 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)23 2-96 12 <br /> Is <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 2/24/99 to 2/25/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/26/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/5/99 <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 /> Blank(continued) 9030049-BLKI <br /> Surrogate: a,a,a-Trij7uorotoluene 3/2199 0.200 0.191 mg/kg 600-140 95.5 <br /> LCS 9030049-BSI <br /> Benzene 3/2/99 0.200 0.192 mg/kg 70.0-130 96.0 <br /> Toluene 0.200 0.194 70.0-130 97.0 <br /> Ethylbenzene 0.200 0.193 70.0-130 96.5 <br /> Xylenes(total) 0.600 0.583 70.0-130 97.2 <br /> Methyl tert-butyl ether 0.200 0.201 70.0-130 101 <br /> Surrogate: a,a,a-Triiuorotoluene 0.100 0.195 60.0-140 97.5 <br /> Matrix Spike 9030049-MS1 5903005-22 <br /> Benzene 3/2/99 0.200 ND 0.174 mg/kg 60.0-140 87.0 <br /> Toluene 0.200 ND 0.179 60.0-140 89.5 <br /> 6 ylbcnzene 0.200 ND 0.182 60.0-140 91.0 <br /> enes(total) 0.600 ND 0.549 60.0-140 91.5 <br /> Methyl tert-butyl ether 0.200 ND 0.172 60.0-140 86.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.204 60.0-140 102 <br /> Matrix Spike Duo 9030049-MSD1 S903005-22 <br /> Benzene 3/2199 0.200 ND 0.174 mg/kg 60.0-140 87.0 25.0 0 <br /> Toluene 0.200 ND 0.181 60.0-140 90.5 25.0 1.11 <br /> Ethylbenzene 0.200 ND 0.185 60.0-140 92.5 25.0 1.63 <br /> Xylenes(total) 0.600 ND 0.556 60.0-140 92.7 25.0 1.30 <br /> Methyl tert-butyl ether 0.200 ND 0.175 60.0-140 87.5 25.0 1.73 <br /> Surrogate: a,a,a-Trifluorololuene 0.200 0.199 60.0-140 99.5 <br /> equoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 16 of 21 <br />