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680 Chesapeake Drive Redwood City CA 94063 (651)'64-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget lane Walnut Creek CA 94598 (915)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 811 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 2093,Tracy,CA Sampled 3/17/99 <br /> 9912 Business Park Drive Ste 100 Project Number 7G600-604-01 Received 3/18/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/1/99 <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 <br /> Analvzcd Leve[ Result Result Units Recov Limits % Limit % Notes' <br /> Batch, 903030$ Date Pccparpd. 3124199 Extraction Method- E.PA 5030B(PIT) <br /> Blank 9030308-8 LK] <br /> Purgeable Hydrocarbons 3/24/99 ND Ug/1 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 500 <br /> Surrogate a s a-Trifluorotoluene 100 890 600-140 890 <br /> LCS 2930308-BSI <br /> Benzene 3/24/99 100 8 77 ug/I 700-130 87 7 <br /> Toluene 100 878 700-130 87 8 <br /> Ethylbenzene 10 0 8 88 700-130 88 8 <br /> 0,ylenes(total) „ 30 0 26 6 70 0-130 88 7 <br /> ethyl tert-butyl ether 100 <br /> 1 1 3 70 0-130 l 13 <br /> Surrogate aaa-T" uorotoluene 10 0 8 70 60 0-140 87 0 <br /> Matrix Spike 9030308-MSI 5903262-05 <br /> Benzene 3/24/99 100 ND 893 ug/l 600-140 89 3 <br /> Toluene 100 ND 8 82 600-140 88 2 <br /> Ethylbenzene t0 0 ND 876 600-140 87 6 <br /> Xylenes(total) 300 ND 265 600-140 883 <br /> Methyl tert-butyl ether 100 ND 169 600-140 169 2 <br /> Surrogate a,a a-Trifluorotaluene 100 859 600-140 85 9 <br /> Matrix Spike Duo 9030308-MSDI 52Q3262-05 <br /> Benzene 3/24/99 10 0 ND 744 ug/l 600-140 74 4 25 0 182 <br /> Toluene 10 0 ND 7 58 600-140 758 25 0 151 <br /> Ethylbenzene 10 0 ND 791 600-140 79 1 25 0 10 2 <br /> Xylenes(total) 30 0 ND 22 7 600-140 757 250 154 <br /> Methyl tent-butyl ether 10 0 ND 5 44 600-140 54 4 25 0 103 2,3 <br /> Surrogate a a a-Trifluorotoluene 100 8 43 600-140 843 <br /> Hatch. 9030327 Date Prepare —3/29 Extractign Method. EPA 5030B(p/T) <br /> Blank 9030327-BLK1 <br /> Purgeable Hydrocarbons 3/24/99 ND ug/l Soo <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> ethyl tert-butyl ether ND 500 <br /> Sequoia Analytical-Sacramento *Refer 10 end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 5 of 9 <br />