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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 - <br /> 4D equoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Striker Avenue Sute 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> 455 865 FAX(707) 792-032 <br /> I%ff Analytical 1551 ndDowall RoadBlvd North Ste D San iCarlosumaCCA 94070-411 1 (6050)232-A 94954 (77) 79219600 FAX(650)232-9612 <br /> f41 <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3/15/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-079-04 Received 3/16/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/l/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, 9030286 Date Prepared.,3122/99 Extraction Method, EPA 5030B(MeOH) <br /> Blank 903OZ86-BLKI <br /> Purgeable Hydrocarbons 3/22/99 ND mg/kg 1 00 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl tert-butyl ether ND 00500 <br /> Surrogate a a a-Trifluorotoluene 0200 0 211 600-140 105 <br /> L CS 9030286-BSI <br /> Benzene 3/22199 0200 0211 mg/kg 700-130 105 <br /> Toluene 0200 0 222 700-130 ill <br /> Ethylbenzene 0200 0 223 700-130 112 <br /> ones(total) 0 600 0 606 700-130 101 <br /> yl tert-butyl ether 0200 0 199 700-130 995 <br /> urrogate a a a-Trtfluorotoluene 0200 0 218 600-140 109 <br /> Matl:lx Spike 9030286-MS1 5903277-02 <br /> Benzene 3/22/99 0200 ND 0 174 mg/kg 600-140 870 <br /> Toluene 0200 ND 0 189 600-140 945 <br /> Ethylbenzene 0200 ND 0 190 600-140 950 <br /> Xylenes(total) 0 600 ND 0 537 600-140 89 5 <br /> Methyl tent-butyl ether 0200 ND 0 169 600-140 845 <br /> Surrogate a a a-Trifluorotoluene 0200 0 220 600-140 110 <br /> Matrix Spike Dun 9030286-MSD/ S903277-02 <br /> Benzene 3/22/99 0200 ND 0 173 mg/kg 600-140 865 25 0 0 576 <br /> Toluene 0200 ND 0 179 600-140 895 250 543 <br /> Ethylbenzene 0200 ND 0 189 600-140 945 250 0 528 <br /> Xylenes(total) 0 600 ND 0 530 600-140 883 25 0 135 <br /> Methyl Cert-butyl ether 0200 ND 0 171 600-140 85 5 250 1 18 <br /> Surrogate aaa-Trifluorotoluene 0200 0209 600-140 105 <br /> Batch, 9030287 Date Prepared, 3/22199 Extraction Method. EPA 5030B(MeOHI <br /> Blank 9030287-BLKI <br /> Purgeable Hydrocarbons 3/22/99 ND mg/kg 1 00 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl tert-butyl ether ND 00500 <br /> Seernoia Analytical -Sacramento *Refer to end of report for text of notes and defouttons <br /> Sandra R Hanson,Client Services Representative Page 15 of 22 <br />